Add pycompat warning

This is helpful to determine if your alerts are valid before an actual failure

.drone.yml

@@ -3,33 +3,15 @@ kind: pipeline
 name: test
 
 steps:
-
   - name: test
-    image: golang:1.12
+    image: golang:1.20
     environment:
       VERSION: ${DRONE_TAG:-${DRONE_COMMIT}}
     commands:
-      - make build
       - make test
 
   - name: check
-    image: python:3
+    image: iamthefij/drone-pre-commit:personal
-    commands:
-      - pip install pre-commit==1.20.0
-      - make check
-
-  - name: notify
-    image: drillster/drone-email
-    settings:
-      host:
-        from_secret: SMTP_HOST
-      username:
-        from_secret: SMTP_USER
-      password:
-        from_secret: SMTP_PASS
-      from: drone@iamthefij.com
-    when:
-      status: [changed, failure]
 
 ---
 kind: pipeline
@@ -48,71 +30,71 @@ trigger:
 
 steps:
   - name: build all binaries
-    image: golang:1.12
+    image: golang:1.20
     environment:
       VERSION: ${DRONE_TAG:-${DRONE_COMMIT}}
     commands:
-      - make all-linux
+      - make all
 
-  - name: push image - arm
+  - name: compress binaries for release
-    image: plugins/docker
+    image: ubuntu
+    commands:
+      - find ./dist -type f -executable -execdir tar -czvf {}.tar.gz {} \;
+    when:
+      event: tag
+
+  - name: upload gitea release
+    image: plugins/gitea-release
+    settings:
+      title: ${DRONE_TAG}
+      files: dist/*.tar.gz
+      checksum:
+        - md5
+        - sha1
+        - sha256
+        - sha512
+      base_url:
+        from_secret: gitea_base_url
+      api_key:
+        from_secret: gitea_token
+    when:
+      event: tag
+
+  - name: Build and publish docker images
+    image: thegeeklab/drone-docker-buildx
     settings:
       repo: iamthefij/minitor-go
       auto_tag: true
-      auto_tag_suffix: linux-arm
+      platforms:
-      username:
+        - linux/amd64
-        from_secret: docker_username
+        - linux/arm64
-      password:
+        - linux/arm
-        from_secret: docker_password
-      build_args:
-        - ARCH=arm
-        - REPO=arm32v7
-
-  - name: push image - arm64
-    image: plugins/docker
-    settings:
-      repo: iamthefij/minitor-go
-      auto_tag: true
-      auto_tag_suffix: linux-arm64
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-      build_args:
-        - ARCH=arm64
-        - REPO=arm64v8
-
-  - name: push image - amd64
-    image: plugins/docker
-    settings:
-      repo: iamthefij/minitor-go
-      auto_tag: true
-      auto_tag_suffix: linux-amd64
       username:
         from_secret: docker_username
       password:
         from_secret: docker_password
 
-  - name: publish manifest
+---
-    image: plugins/manifest
+kind: pipeline
-    settings:
+name: notify
-      spec: manifest.tmpl
+
-      auto_tag: true
+depends_on:
-      ignore_missing: true
+  - test
-      username:
+  - publish
-        from_secret: docker_username
+
-      password:
+trigger:
-        from_secret: docker_password
+  status:
+    - failure
+
+steps:
 
   - name: notify
     image: drillster/drone-email
     settings:
       host:
-        from_secret: SMTP_HOST
+        from_secret: SMTP_HOST  # pragma: whitelist secret
       username:
-        from_secret: SMTP_USER
+        from_secret: SMTP_USER  # pragma: whitelist secret
       password:
-        from_secret: SMTP_PASS
+        from_secret: SMTP_PASS  # pragma: whitelist secret
       from: drone@iamthefij.com
-    when:
-      status: [changed, failure]

.gitignore

@@ -17,4 +17,5 @@ config.yml
 
 # Output binary
 minitor
+minitor-go
 dist/

.golangci.yml

@@ -0,0 +1,36 @@
+---
+linters:
+  enable:
+    - errname
+    - errorlint
+    - exhaustive
+    - gofumpt
+    - goimports
+    - gomnd
+    - goprintffuncname
+    - misspell
+    - tagliatelle
+    - tenv
+    - testpackage
+    - thelper
+    - tparallel
+    - unconvert
+    - wrapcheck
+    - wsl
+  disable:
+    - gochecknoglobals
+
+linters-settings:
+  gosec:
+    excludes:
+      - G204
+  tagliatelle:
+    case:
+      rules:
+        yaml: snake
+
+issues:
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gosec

.pre-commit-config.yaml

@@ -1,7 +1,7 @@
 ---
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.4.0
+    rev: v4.4.0
     hooks:
       - id: check-added-large-files
       - id: check-yaml
@@ -10,15 +10,11 @@ repos:
       - id: trailing-whitespace
       - id: end-of-file-fixer
       - id: check-merge-conflict
-  - repo: git://github.com/dnephin/pre-commit-golang
+  - repo: https://github.com/golangci/golangci-lint
-    rev: v0.3.5
+    rev: v1.52.2
     hooks:
-      - id: go-fmt
+      - id: golangci-lint
-      - id: go-imports
+  - repo: https://github.com/hadolint/hadolint
-      # - id: gometalinter
+    rev: v2.12.1-beta
-      # - id: golangci-lint
+    hooks:
-  # - repo: https://github.com/IamTheFij/docker-pre-commit
+      - id: hadolint
-  #   rev: v2.0.0
-  #   hooks:
-  #     - id: docker-compose-check
-  #     - id: hadolint

Dockerfile

@@ -1,15 +1,10 @@
-ARG REPO=library
+FROM alpine:3.18
-FROM multiarch/qemu-user-static:4.2.0-2 as qemu-user-static
-FROM ${REPO}/alpine:3.10
-
-# Copying all qemu files because amd64 doesn't exist and cannot condional copy
-COPY --from=qemu-user-static /usr/bin/qemu-* /usr/bin/
 
 RUN mkdir /app
 WORKDIR /app/
 
 # Add common checking tools
-RUN apk --no-cache add bash=~5.0 curl=~7.66 jq=~1.6
+RUN apk --no-cache add bash=~5 curl=~8 jq=~1 bind-tools=~9 tzdata~=2024a
 
 # Add minitor user for running as non-root
 RUN addgroup -S minitor && adduser -S minitor -G minitor
@@ -19,8 +14,9 @@ COPY ./scripts /app/scripts
 RUN chmod -R 755 /app/scripts
 
 # Copy minitor in
-ARG ARCH=amd64
+ARG TARGETOS
-COPY ./dist/minitor-linux-${ARCH} ./minitor
+ARG TARGETARCH
+COPY ./dist/minitor-${TARGETOS}-${TARGETARCH} ./minitor
 
 # Drop to non-root user
 USER minitor

Dockerfile.multi-stage

@@ -1,7 +1,4 @@
-ARG REPO=library
+FROM golang:1.20 AS builder
-FROM golang:1.12-alpine AS builder
-
-RUN apk add --no-cache git=~2
 
 RUN mkdir /app
 WORKDIR /app
@@ -11,12 +8,13 @@ RUN go mod download
 
 COPY ./*.go /app/
 
-ARG ARCH=amd64
+ARG TARGETOS
+ARG TARGETARCH
 ARG VERSION=dev
-ENV CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH}
+ENV CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=${TARGETARCH}
 RUN go build -ldflags "-X main.version=${VERSION}" -a -installsuffix nocgo -o minitor .
 
-FROM ${REPO}/alpine:3.10
+FROM alpine:3.18
 RUN mkdir /app
 WORKDIR /app/
 
@@ -24,7 +22,7 @@ WORKDIR /app/
 COPY --from=builder /app/minitor .
 
 # Add common checking tools
-RUN apk --no-cache add bash=~5.0 curl=~7.66 jq=~1.6
+RUN apk --no-cache add bash=~5 curl=~8 jq=~1 bind-tools=~9 tzdata~=2024a
 
 # Add minitor user for running as non-root
 RUN addgroup -S minitor && adduser -S minitor -G minitor

Makefile

@@ -1,6 +1,6 @@
 DOCKER_TAG ?= minitor-go-${USER}
 VERSION ?= $(shell git describe --tags --dirty)
-GOFILES = *.go
+GOFILES = *.go go.mod go.sum
 # Multi-arch targets are generated from this
 TARGET_ALIAS = minitor-linux-amd64 minitor-linux-arm minitor-linux-arm64 minitor-darwin-amd64
 TARGETS = $(addprefix dist/,$(TARGET_ALIAS))
@@ -46,7 +46,7 @@ test:
 install-hooks:
 	pre-commit install --install-hooks
 
-# Checks files for encryption
+# Runs pre-commit checks on files
 .PHONY: check
 check:
 	pre-commit run --all-files
@@ -79,11 +79,11 @@ $(TARGET_ALIAS):
 # Arch specific docker build targets
 .PHONY: docker-build-arm
 docker-build-arm: dist/minitor-linux-arm
-	docker build --build-arg REPO=arm32v7 --build-arg ARCH=arm . -t ${DOCKER_TAG}-linux-arm
+	docker build --platform linux/arm . -t ${DOCKER_TAG}-linux-arm
 
 .PHONY: docker-build-arm64
 docker-build-arm64: dist/minitor-linux-arm64
-	docker build --build-arg REPO=arm64v8 --build-arg ARCH=arm64 . -t ${DOCKER_TAG}-linux-arm64
+	docker build  --platform linux/arm64 . -t ${DOCKER_TAG}-linux-arm64
 
 # Cross run on host architechture
 .PHONY: docker-run-arm

README.md

@@ -46,6 +46,8 @@ docker run -v $PWD/config.yml:/app/config.yml iamthefij/minitor-go:latest
 
 Images are provided for `amd64`, `arm`, and `arm64` architechtures.
 
+Timezone configuration for the container is set by passing the `TZ` env variable. Eg. `TZ=America/Los_Angeles`.
+
 ## Configuring
 
 In this repo, you can explore the `sample-config.yml` file for an example, but the general structure is as follows. It should be noted that environment variable interpolation happens on load of the YAML file.
@@ -54,7 +56,10 @@ The global configurations are:
 
 |key|value|
 |---|---|
-|`check_interval`|Maximum frequency to run checks for each monitor|
+|`check_interval`|Maximum frequency to run checks for each monitor as duration, eg. 1m2s.|
+|`default_alert_after`|A default value used as an `alert_after` value for a monitor if not specified or 0.|
+|`default_alert_down`|Default down alerts to used by a monitor in case none are provided.|
+|`default_alert_up`|Default up alerts to used by a monitor in case none are provided.|
 |`monitors`|List of all monitors. Detailed description below|
 |`alerts`|List of all alerts. Detailed description below|
 
@@ -91,10 +96,38 @@ Also, when alerts are executed, they will be passed through Go's format function
 |`{{.AlertCount}}`|Number of times this monitor has alerted|
 |`{{.FailureCount}}`|The total number of sequential failed checks for this monitor|
 |`{{.LastCheckOutput}}`|The last returned value from the check command to either stderr or stdout|
-|`{{.LastSuccess}}`|The ISO datetime of the last successful check|
+|`{{.LastSuccess}}`|The datetime of the last successful check as a go Time struct|
 |`{{.MonitorName}}`|The name of the monitor that failed and triggered the alert|
 |`{{.IsUp}}`|Indicates if the monitor that is alerting is up or not. Can be used in a conditional message template|
 
+To provide flexible formatting, the following non-standard functions are available in templates:
+
+|func|description|
+|---|---|
+|`ANSIC <Time>`|Formats provided time in ANSIC format|
+|`UnixDate <Time>`|Formats provided time in UnixDate format|
+|`RubyDate <Time>`|Formats provided time in RubyDate format|
+|`RFC822Z <Time>`|Formats provided time in RFC822Z format|
+|`RFC850 <Time>`|Formats provided time in RFC850 format|
+|`RFC1123 <Time>`|Formats provided time in RFC1123 format|
+|`RFC1123Z <Time>`|Formats provided time in RFC1123Z format|
+|`RFC3339 <Time>`|Formats provided time in RFC3339 format|
+|`RFC3339Nano <Time>`|Formats provided time in RFC3339Nano format|
+|`FormatTime <Time> <string template>`|Formats provided time according to provided template|
+|`InTZ <Time> <string timezone name>`|Converts provided time to parsed timezone from the provided name|
+
+For more information, check out the [Go documentation for the time module](https://pkg.go.dev/time@go1.20.7#pkg-constants).
+
+#### Running alerts on startup
+
+It's not the best feeling to find out your alerts are broken when you're expecting to be alerted about another failure. To avoid this and provide early insight into broken alerts, it is possible to specify a list of alerts to run when Minitor starts up. This can be done using the command line flag `-startup-alerts`. This flag accepts a comma separated list of strings and will run a test of each of those alerts. Minitor will then respond as it typically does for any failed alert. This can be used to allow you time to correct when initially launching, and to allow schedulers to more easily detect a failed deployment of Minitor.
+
+Eg.
+
+```bash
+minitor -startup-alerts=log_down,log_up -config ./config.yml
+```
+
 ### Metrics
 
 Minitor supports exporting metrics for [Prometheus](https://prometheus.io/). Prometheus is an open source tool for reading and querying metrics from different sources. Combined with another tool, [Grafana](https://grafana.com/), it allows building of charts and dashboards. You could also opt to just use Minitor to log check results, and instead do your alerting with Grafana.
@@ -111,7 +144,7 @@ minitor -metrics -metrics-port 3000
 
 ## Contributing
 
-Whether you're looking to submit a patch or just tell me I broke something, you can contribute through the Github mirror and I can merge PRs back to the source repository.
+Whether you're looking to submit a patch or tell me I broke something, you can contribute through the Github mirror and I can merge PRs back to the source repository.
 
 Primary Repo: https://git.iamthefij.com/iamthefij/minitor.git
 
@@ -143,15 +176,25 @@ alerts:
     command: 'echo {{.MonitorName}}'
 ```
 
+Interval durations have changed from being an integer number of seconds to a duration string supported by Go, for example:
+
+minitor-py:
+```yaml
+check_interval: 90
+```
+
+minitor-go:
+```yaml
+check_interval: 1m30s
+```
+
 For the time being, legacy configs for the Python version of Minitor should be compatible if you apply the `-py-compat` flag when running Minitor. Eventually, this flag will go away when later breaking changes are introduced.
 
 ## Future
 
 Future, potentially breaking changes
 
-  - [ ] Implement leveled logging (maybe glog or logrus)
   - [ ] Consider value of templating vs injecting values into Env variables
   - [ ] Async checking
   - [ ] Revisit metrics and see if they all make sense
   - [ ] Consider dropping `alert_up` and `alert_down` in favor of using Go templates that offer more control of messaging (Breaking)
-  - [ ] Use durations rather than seconds checked in event loop (Potentially breaking)

alert.go

@@ -2,12 +2,21 @@ package main
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
-	"log"
 	"os/exec"
 	"strings"
 	"text/template"
 	"time"
+
+	"git.iamthefij.com/iamthefij/slog"
+)
+
+var (
+	errNoTemplate = errors.New("no template")
+
+	// ErrAlertFailed indicates that an alert failed to send
+	ErrAlertFailed = errors.New("alert failed")
 )
 
 // Alert is a config driven mechanism for sending a notice
@@ -20,12 +29,12 @@ type Alert struct {
 
 // AlertNotice captures the context for an alert to be sent
 type AlertNotice struct {
-	MonitorName     string
 	AlertCount      int16
 	FailureCount    int16
-	LastCheckOutput string
-	LastSuccess     time.Time
 	IsUp            bool
+	LastSuccess     time.Time
+	MonitorName     string
+	LastCheckOutput string
 }
 
 // IsValid returns a boolean indicating if the Alert has been correctly
@@ -45,29 +54,64 @@ func (alert *Alert) BuildTemplates() error {
 		"{last_success}", "{{.LastSuccess}}",
 		"{monitor_name}", "{{.MonitorName}}",
 	)
-	if LogDebug {
+
-		log.Printf("DEBUG: Building template for alert %s", alert.Name)
+	slog.Debugf("Building template for alert %s", alert.Name)
+
+	// Time format func factory
+	tff := func(formatString string) func(time.Time) string {
+		return func(t time.Time) string {
+			return t.Format(formatString)
 		}
-	if alert.commandTemplate == nil && alert.Command.Command != nil {
+	}
+
+	// Create some functions for formatting datetimes in popular formats
+	timeFormatFuncs := template.FuncMap{
+		"ANSIC":       tff(time.ANSIC),
+		"UnixDate":    tff(time.UnixDate),
+		"RubyDate":    tff(time.RubyDate),
+		"RFC822Z":     tff(time.RFC822Z),
+		"RFC850":      tff(time.RFC850),
+		"RFC1123":     tff(time.RFC1123),
+		"RFC1123Z":    tff(time.RFC1123Z),
+		"RFC3339":     tff(time.RFC3339),
+		"RFC3339Nano": tff(time.RFC3339Nano),
+		"FormatTime": func(t time.Time, timeFormat string) string {
+			return t.Format(timeFormat)
+		},
+		"InTZ": func(t time.Time, tzName string) (time.Time, error) {
+			tz, err := time.LoadLocation(tzName)
+			if err != nil {
+				return t, fmt.Errorf("failed to convert time to specified tz: %w", err)
+			}
+
+			return t.In(tz), nil
+		},
+	}
+
+	switch {
+	case alert.commandTemplate == nil && alert.Command.Command != nil:
 		alert.commandTemplate = []*template.Template{}
 		for i, cmdPart := range alert.Command.Command {
 			if PyCompat {
 				cmdPart = legacy.Replace(cmdPart)
 			}
+
 			alert.commandTemplate = append(alert.commandTemplate, template.Must(
-				template.New(alert.Name+string(i)).Parse(cmdPart),
+				template.New(alert.Name+fmt.Sprint(i)).Funcs(timeFormatFuncs).Parse(cmdPart),
 			))
 		}
-	} else if alert.commandShellTemplate == nil && alert.Command.ShellCommand != "" {
+	case alert.commandShellTemplate == nil && alert.Command.ShellCommand != "":
 		shellCmd := alert.Command.ShellCommand
+
 		if PyCompat {
 			shellCmd = legacy.Replace(shellCmd)
 		}
+
 		alert.commandShellTemplate = template.Must(
-			template.New(alert.Name).Parse(shellCmd),
+			template.New(alert.Name).Funcs(timeFormatFuncs).Parse(shellCmd),
 		)
-	} else {
+	default:
-		return fmt.Errorf("No template provided for alert %s", alert.Name)
+		return fmt.Errorf("No template provided for alert %s: %w", alert.Name, errNoTemplate)
 	}
 
 	return nil
@@ -75,30 +119,40 @@ func (alert *Alert) BuildTemplates() error {
 
 // Send will send an alert notice by executing the command template
 func (alert Alert) Send(notice AlertNotice) (outputStr string, err error) {
-	log.Printf("INFO: Sending alert %s for %s", alert.Name, notice.MonitorName)
+	slog.Infof("Sending alert %s for %s", alert.Name, notice.MonitorName)
+
 	var cmd *exec.Cmd
-	if alert.commandTemplate != nil {
+
+	switch {
+	case alert.commandTemplate != nil:
 		command := []string{}
+
 		for _, cmdTmp := range alert.commandTemplate {
 			var commandBuffer bytes.Buffer
+
 			err = cmdTmp.Execute(&commandBuffer, notice)
 			if err != nil {
 				return
 			}
+
 			command = append(command, commandBuffer.String())
 		}
+
 		cmd = exec.Command(command[0], command[1:]...)
-	} else if alert.commandShellTemplate != nil {
+	case alert.commandShellTemplate != nil:
 		var commandBuffer bytes.Buffer
+
 		err = alert.commandShellTemplate.Execute(&commandBuffer, notice)
 		if err != nil {
 			return
 		}
+
 		shellCommand := commandBuffer.String()
 
 		cmd = ShellCommand(shellCommand)
-	} else {
+	default:
-		err = fmt.Errorf("No templates compiled for alert %v", alert.Name)
+		err = fmt.Errorf("No templates compiled for alert %s: %w", alert.Name, errNoTemplate)
+
 		return
 	}
 
@@ -110,8 +164,15 @@ func (alert Alert) Send(notice AlertNotice) (outputStr string, err error) {
 	var output []byte
 	output, err = cmd.CombinedOutput()
 	outputStr = string(output)
-	if LogDebug {
+	slog.Debugf("Alert output for: %s\n---\n%s\n---", alert.Name, outputStr)
-		log.Printf("DEBUG: Alert output for: %s\n---\n%s\n---", alert.Name, outputStr)
+
+	if err != nil {
+		err = fmt.Errorf(
+			"Alert %s failed to send. Returned %w: %w",
+			alert.Name,
+			err,
+			ErrAlertFailed,
+		)
 	}
 
 	return outputStr, err

alert_test.go

@@ -18,11 +18,13 @@ func TestAlertIsValid(t *testing.T) {
 
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
+
 		actual := c.alert.IsValid()
 		if actual != c.expected {
 			t.Errorf("IsValid(%v), expected=%t actual=%t", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -100,19 +102,28 @@ func TestAlertSend(t *testing.T) {
 		log.Printf("Testing case %s", c.name)
 		// Set PyCompat to value of compat flag
 		PyCompat = c.pyCompat
-		c.alert.BuildTemplates()
+
+		err := c.alert.BuildTemplates()
+		if err != nil {
+			t.Errorf("Send(%v output), error building templates: %v", c.name, err)
+		}
+
 		output, err := c.alert.Send(c.notice)
 		hasErr := (err != nil)
+
 		if output != c.expectedOutput {
 			t.Errorf("Send(%v output), expected=%v actual=%v", c.name, c.expectedOutput, output)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		if hasErr != c.expectErr {
 			t.Errorf("Send(%v err), expected=%v actual=%v", c.name, "Err", err)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		// Set PyCompat back to default value
 		PyCompat = false
+
 		log.Println("-----")
 	}
 }
@@ -120,10 +131,12 @@ func TestAlertSend(t *testing.T) {
 func TestAlertSendNoTemplates(t *testing.T) {
 	alert := Alert{}
 	notice := AlertNotice{}
+
 	output, err := alert.Send(notice)
 	if err == nil {
 		t.Errorf("Send(no template), expected=%v actual=%v", "Err", output)
 	}
+
 	log.Println("-----")
 }
 
@@ -142,10 +155,12 @@ func TestAlertBuildTemplate(t *testing.T) {
 		log.Printf("Testing case %s", c.name)
 		err := c.alert.BuildTemplates()
 		hasErr := (err != nil)
+
 		if hasErr != c.expectErr {
 			t.Errorf("IsValid(%v), expected=%t actual=%t", c.name, c.expectErr, err)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }

config.go

@@ -2,15 +2,22 @@ package main
 
 import (
 	"errors"
-	"io/ioutil"
+	"os"
-	"log"
+	"time"
 
+	"git.iamthefij.com/iamthefij/slog"
 	"gopkg.in/yaml.v2"
 )
 
+var errInvalidConfig = errors.New("Invalid configuration")
+
 // Config type is contains all provided user configuration
 type Config struct {
-	CheckInterval int64 `yaml:"check_interval"`
+	CheckInterval     SecondsOrDuration `yaml:"check_interval"`
+	DefaultAlertAfter int16             `yaml:"default_alert_after"`
+	DefaultAlertEvery *int16            `yaml:"default_alert_every"`
+	DefaultAlertDown  []string          `yaml:"default_alert_down"`
+	DefaultAlertUp    []string          `yaml:"default_alert_up"`
 	Monitors          []*Monitor
 	Alerts            map[string]*Alert
 }
@@ -35,17 +42,48 @@ func (cos *CommandOrShell) UnmarshalYAML(unmarshal func(interface{}) error) erro
 	// Error indicates this is shell command
 	if err != nil {
 		var shellCmd string
+
 		err := unmarshal(&shellCmd)
 		if err != nil {
 			return err
 		}
+
 		cos.ShellCommand = shellCmd
 	} else {
 		cos.Command = cmd
 	}
+
 	return nil
 }
 
+// SecondsOrDuration wraps a duration value for parsing a duration or seconds from YAML
+// NOTE: This should be removed in favor of only parsing durations once compatibility is broken
+type SecondsOrDuration struct {
+	value time.Duration
+}
+
+// Value returns a duration value
+func (sod SecondsOrDuration) Value() time.Duration {
+	return sod.value
+}
+
+// UnmarshalYAML allows unmarshalling a duration value or seconds if an int was provided
+func (sod *SecondsOrDuration) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var seconds int64
+	err := unmarshal(&seconds)
+
+	if err == nil {
+		sod.value = time.Second * time.Duration(seconds)
+
+		return nil
+	}
+
+	// Error indicates that we don't have an int
+	err = unmarshal(&sod.value)
+
+	return err
+}
+
 // IsValid checks config validity and returns true if valid
 func (config Config) IsValid() (isValid bool) {
 	isValid = true
@@ -53,47 +91,75 @@ func (config Config) IsValid() (isValid bool) {
 	// Validate alerts
 	if config.Alerts == nil || len(config.Alerts) == 0 {
 		// This should never happen because there is a default alert named 'log' for now
-		log.Printf("ERROR: Invalid alert configuration: Must provide at least one alert")
+		slog.Errorf("Invalid alert configuration: Must provide at least one alert")
+
 		isValid = false
 	}
+
 	for _, alert := range config.Alerts {
 		if !alert.IsValid() {
-			log.Printf("ERROR: Invalid alert configuration: %s", alert.Name)
+			slog.Errorf("Invalid alert configuration: %+v", alert.Name)
+
 			isValid = false
+		} else {
+			slog.Debugf("Loaded alert %s", alert.Name)
 		}
 	}
 
 	// Validate monitors
 	if config.Monitors == nil || len(config.Monitors) == 0 {
-		log.Printf("ERROR: Invalid monitor configuration: Must provide at least one monitor")
+		slog.Errorf("Invalid monitor configuration: Must provide at least one monitor")
+
 		isValid = false
 	}
+
 	for _, monitor := range config.Monitors {
 		if !monitor.IsValid() {
-			log.Printf("ERROR: Invalid monitor configuration: %s", monitor.Name)
+			slog.Errorf("Invalid monitor configuration: %s", monitor.Name)
+
 			isValid = false
 		}
 		// Check that all Monitor alerts actually exist
 		for _, isUp := range []bool{true, false} {
 			for _, alertName := range monitor.GetAlertNames(isUp) {
 				if _, ok := config.Alerts[alertName]; !ok {
-					log.Printf(
+					slog.Errorf(
-						"ERROR: Invalid monitor configuration: %s. Unknown alert %s",
+						"Invalid monitor configuration: %s. Unknown alert %s",
 						monitor.Name, alertName,
 					)
+
 					isValid = false
 				}
 			}
 		}
 	}
 
-	return
+	return isValid
 }
 
 // Init performs extra initialization on top of loading the config from file
 func (config *Config) Init() (err error) {
+	for _, monitor := range config.Monitors {
+		if monitor.AlertAfter == 0 && config.DefaultAlertAfter > 0 {
+			monitor.AlertAfter = config.DefaultAlertAfter
+		}
+
+		if monitor.AlertEvery == nil && config.DefaultAlertEvery != nil {
+			monitor.AlertEvery = config.DefaultAlertEvery
+		}
+
+		if len(monitor.AlertDown) == 0 && len(config.DefaultAlertDown) > 0 {
+			monitor.AlertDown = config.DefaultAlertDown
+		}
+
+		if len(monitor.AlertUp) == 0 && len(config.DefaultAlertUp) > 0 {
+			monitor.AlertUp = config.DefaultAlertUp
+		}
+	}
+
 	for name, alert := range config.Alerts {
 		alert.Name = name
+
 		if err = alert.BuildTemplates(); err != nil {
 			return
 		}
@@ -104,7 +170,7 @@ func (config *Config) Init() (err error) {
 
 // LoadConfig will read config from the given path and parse it
 func LoadConfig(filePath string) (config Config, err error) {
-	data, err := ioutil.ReadFile(filePath)
+	data, err := os.ReadFile(filePath)
 	if err != nil {
 		return
 	}
@@ -114,28 +180,30 @@ func LoadConfig(filePath string) (config Config, err error) {
 		return
 	}
 
-	if LogDebug {
+	slog.Debugf("Config values:\n%v\n", config)
-		log.Printf("DEBUG: Config values:\n%v\n", config)
-	}
 
 	// Add log alert if not present
 	if PyCompat {
-		// Intialize alerts list if not present
+		// Initialize alerts list if not present
 		if config.Alerts == nil {
 			config.Alerts = map[string]*Alert{}
 		}
+
 		if _, ok := config.Alerts["log"]; !ok {
 			config.Alerts["log"] = NewLogAlert()
 		}
 	}
 
-	if !config.IsValid() {
-		err = errors.New("Invalid configuration")
-		return
-	}
-
 	// Finish initializing configuration
-	err = config.Init()
+	if err = config.Init(); err != nil {
+		return
+	}
+
+	if !config.IsValid() {
+		err = errInvalidConfig
 
 		return
 	}
+
+	return config, err
+}

config_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"log"
 	"testing"
+	"time"
 )
 
 func TestLoadConfig(t *testing.T) {
@@ -13,6 +14,7 @@ func TestLoadConfig(t *testing.T) {
 		pyCompat   bool
 	}{
 		{"./test/valid-config.yml", false, "Valid config file", false},
+		{"./test/valid-config-default-values.yml", false, "Valid config file with default values", false},
 		{"./test/valid-default-log-alert.yml", false, "Valid config file with default log alert PyCompat", true},
 		{"./test/valid-default-log-alert.yml", true, "Invalid config file no log alert", false},
 		{"./test/does-not-exist", true, "Invalid config path", false},
@@ -27,20 +29,50 @@ func TestLoadConfig(t *testing.T) {
 		PyCompat = c.pyCompat
 		_, err := LoadConfig(c.configPath)
 		hasErr := (err != nil)
+
 		if hasErr != c.expectErr {
 			t.Errorf("LoadConfig(%v), expected_error=%v actual=%v", c.name, c.expectErr, err)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		// Set PyCompat to default value
 		PyCompat = false
-		log.Println("-----")
 	}
 }
 
+func TestIntervalParsing(t *testing.T) {
+	log.Printf("Testing case TestIntervalParsing")
+
+	config, err := LoadConfig("./test/valid-config.yml")
+	if err != nil {
+		t.Errorf("Failed loading config: %v", err)
+	}
+
+	oneSecond := time.Second
+	tenSeconds := 10 * time.Second
+	oneMinute := time.Minute
+
+	// validate top level interval seconds represented as an int
+	if config.CheckInterval.Value() != oneSecond {
+		t.Errorf("Incorrectly parsed int seconds. expected=%v actual=%v", oneSecond, config.CheckInterval)
+	}
+
+	if config.Monitors[0].CheckInterval.Value() != tenSeconds {
+		t.Errorf("Incorrectly parsed seconds duration. expected=%v actual=%v", oneSecond, config.CheckInterval)
+	}
+
+	if config.Monitors[1].CheckInterval.Value() != oneMinute {
+		t.Errorf("Incorrectly parsed seconds duration. expected=%v actual=%v", oneSecond, config.CheckInterval)
+	}
+
+	log.Println("-----")
+}
+
 // TestMultiLineConfig is a more complicated test stepping through the parsing
 // and execution of mutli-line strings presented in YAML
 func TestMultiLineConfig(t *testing.T) {
 	log.Println("Testing multi-line string config")
+
 	config, err := LoadConfig("./test/valid-verify-multi-line.yml")
 	if err != nil {
 		t.Fatalf("TestMultiLineConfig(load), expected=no_error actual=%v", err)
@@ -48,8 +80,10 @@ func TestMultiLineConfig(t *testing.T) {
 
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(parse > string)")
+
 	expected := "echo 'Some string with stuff'; echo \"<angle brackets>\"; exit 1\n"
 	actual := config.Monitors[0].Command.ShellCommand
+
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(>) failed")
 		t.Logf("string expected=`%v`", expected)
@@ -60,12 +94,15 @@ func TestMultiLineConfig(t *testing.T) {
 
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(execute > string)")
+
 	_, notice := config.Monitors[0].Check()
 	if notice == nil {
 		t.Fatalf("Did not receive an alert notice")
 	}
+
 	expected = "Some string with stuff\n<angle brackets>\n"
 	actual = notice.LastCheckOutput
+
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(execute > string) check failed")
 		t.Logf("string expected=`%v`", expected)
@@ -76,8 +113,10 @@ func TestMultiLineConfig(t *testing.T) {
 
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(parse | string)")
+
 	expected = "echo 'Some string with stuff'\necho '<angle brackets>'\n"
 	actual = config.Alerts["log_shell"].Command.ShellCommand
+
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(|) failed")
 		t.Logf("string expected=`%v`", expected)
@@ -88,10 +127,12 @@ func TestMultiLineConfig(t *testing.T) {
 
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(execute | string)")
+
 	actual, err = config.Alerts["log_shell"].Send(AlertNotice{})
 	if err != nil {
 		t.Errorf("Execution of alert failed")
 	}
+
 	expected = "Some string with stuff\n<angle brackets>\n"
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(execute | string) check failed")

go.mod

@@ -1,8 +1,23 @@
 module git.iamthefij.com/iamthefij/minitor-go
 
-go 1.12
+go 1.20
 
 require (
-	github.com/prometheus/client_golang v1.2.1
+	git.iamthefij.com/iamthefij/slog v1.3.0
-	gopkg.in/yaml.v2 v2.2.4
+	github.com/prometheus/client_golang v1.19.0
+	gopkg.in/yaml.v2 v2.4.0
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/common v0.48.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
 )

go.sum

@@ -1,78 +1,546 @@
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+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
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main.go

@@ -1,16 +1,16 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
-	"log"
+	"strings"
 	"time"
+
+	"git.iamthefij.com/iamthefij/slog"
 )
 
 var (
-	// LogDebug will control whether debug messsages should be logged
-	LogDebug = false
-
 	// ExportMetrics will track whether or not we want to export metrics to prometheus
 	ExportMetrics = false
 	// MetricsPort is the port to expose metrics on
@@ -23,58 +23,68 @@ var (
 
 	// version of minitor being run
 	version = "dev"
+
+	errUnknownAlert = errors.New("unknown alert")
 )
 
-func checkMonitors(config *Config) error {
+func sendAlerts(config *Config, monitor *Monitor, alertNotice *AlertNotice) error {
-	for _, monitor := range config.Monitors {
+	slog.Debugf("Received an alert notice from %s", alertNotice.MonitorName)
-		if monitor.ShouldCheck() {
-			success, alertNotice := monitor.Check()
-
-			hasAlert := alertNotice != nil
-
-			// Track status metrics
-			Metrics.SetMonitorStatus(monitor.Name, monitor.IsUp())
-			Metrics.CountCheck(monitor.Name, success, hasAlert)
-
-			// Should probably consider refactoring everything below here
-			if alertNotice != nil {
-				if LogDebug {
-					log.Printf("DEBUG: Recieved an alert notice from %s", alertNotice.MonitorName)
-				}
 	alertNames := monitor.GetAlertNames(alertNotice.IsUp)
+
 	if alertNames == nil {
 		// This should only happen for a recovery alert. AlertDown is validated not empty
-					log.Printf(
+		slog.Warningf(
-						"WARNING: Recieved alert, but no alert mechanisms exist. MonitorName=%s IsUp=%t",
+			"Received alert, but no alert mechanisms exist. MonitorName=%s IsUp=%t",
 			alertNotice.MonitorName, alertNotice.IsUp,
 		)
+
+		return nil
 	}
+
 	for _, alertName := range alertNames {
 		if alert, ok := config.Alerts[alertName]; ok {
 			output, err := alert.Send(*alertNotice)
 			if err != nil {
-							log.Printf(
+				slog.Errorf(
-								"ERROR: Alert '%s' failed. result=%v: output=%s",
+					"Alert '%s' failed. result=%v: output=%s",
 					alert.Name,
 					err,
 					output,
 				)
-							return fmt.Errorf(
+
-								"Unsuccessfully triggered alert '%s'. "+
+				return err
-									"Crashing to avoid false negatives: %v",
-								alert.Name,
-								err,
-							)
 			}
 
 			// Count alert metrics
 			Metrics.CountAlert(monitor.Name, alert.Name)
 		} else {
 			// This case should never actually happen since we validate against it
-						log.Printf("ERROR: Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
+			slog.Errorf("Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
-						return fmt.Errorf("Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
+
+			return fmt.Errorf("unknown alert for monitor %s: %s: %w", alertNotice.MonitorName, alertName, errUnknownAlert)
 		}
 	}
+
+	return nil
+}
+
+func checkMonitors(config *Config) error {
+	// TODO: Run this in goroutines and capture exceptions
+	for _, monitor := range config.Monitors {
+		if monitor.ShouldCheck() {
+			success, alertNotice := monitor.Check()
+			hasAlert := alertNotice != nil
+
+			// Track status metrics
+			Metrics.SetMonitorStatus(monitor.Name, monitor.IsUp())
+			Metrics.CountCheck(monitor.Name, success, monitor.LastCheckMilliseconds(), hasAlert)
+
+			if alertNotice != nil {
+				err := sendAlerts(config, monitor, alertNotice)
+				// If there was an error in sending an alert, exit early and bubble it up
+				if err != nil {
+					return err
+				}
 			}
 		}
 	}
@@ -82,42 +92,80 @@ func checkMonitors(config *Config) error {
 	return nil
 }
 
+func sendStartupAlerts(config *Config, alertNames []string) error {
+	for _, alertName := range alertNames {
+		var err error
+
+		alert, ok := config.Alerts[alertName]
+		if !ok {
+			err = fmt.Errorf("unknown alert %s: %w", alertName, errUnknownAlert)
+		}
+
+		if err == nil {
+			_, err = alert.Send(AlertNotice{
+				AlertCount:      0,
+				FailureCount:    0,
+				IsUp:            true,
+				LastSuccess:     time.Now(),
+				MonitorName:     fmt.Sprintf("First Run Alert Test: %s", alert.Name),
+				LastCheckOutput: "",
+			})
+		}
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func main() {
-	// Get debug flag
+	showVersion := flag.Bool("version", false, "Display the version of minitor and exit")
-	flag.BoolVar(&LogDebug, "debug", false, "Enables debug logs (default: false)")
+	configPath := flag.String("config", "config.yml", "Alternate configuration path (default: config.yml)")
+	startupAlerts := flag.String("startup-alerts", "", "List of alerts to run on startup. This can help determine unhealthy alerts early on. (default \"\")")
+
+	flag.BoolVar(&slog.DebugLevel, "debug", false, "Enables debug logs (default: false)")
 	flag.BoolVar(&ExportMetrics, "metrics", false, "Enables prometheus metrics exporting (default: false)")
 	flag.BoolVar(&PyCompat, "py-compat", false, "Enables support for legacy Python Minitor config. Will eventually be removed. (default: false)")
-	flag.IntVar(&MetricsPort, "metrics-port", 8080, "The port that Prometheus metrics should be exported on, if enabled. (default: 8080)")
+	flag.IntVar(&MetricsPort, "metrics-port", MetricsPort, "The port that Prometheus metrics should be exported on, if enabled. (default: 8080)")
-	var showVersion = flag.Bool("version", false, "Display the version of minitor and exit")
-	var configPath = flag.String("config", "config.yml", "Alternate configuration path (default: config.yml)")
 	flag.Parse()
 
 	// Print version if flag is provided
 	if *showVersion {
-		log.Println("Minitor version:", version)
+		fmt.Println("Minitor version:", version)
+
 		return
 	}
 
+	if PyCompat {
+		slog.Warningf("Python compatibility mode is enabled. This will be removed in the next major release. Please update your configuration.")
+	}
+
 	// Load configuration
 	config, err := LoadConfig(*configPath)
-	if err != nil {
+	slog.OnErrFatalf(err, "Error loading config: %v", err)
-		log.Fatalf("Error loading config: %v", err)
-	}
 
 	// Serve metrics exporter, if specified
 	if ExportMetrics {
-		log.Println("INFO: Exporting metrics to Prometheus")
+		slog.Infof("Exporting metrics to Prometheus on port %d", MetricsPort)
+
 		go ServeMetrics()
 	}
 
+	if *startupAlerts != "" {
+		alertNames := strings.Split(*startupAlerts, ",")
+
+		err = sendStartupAlerts(&config, alertNames)
+
+		slog.OnErrPanicf(err, "Error running startup alerts")
+	}
+
 	// Start main loop
 	for {
 		err = checkMonitors(&config)
-		if err != nil {
+		slog.OnErrPanicf(err, "Error checking monitors")
-			panic(err)
-		}
 
-		sleepTime := time.Duration(config.CheckInterval) * time.Second
+		time.Sleep(config.CheckInterval.Value())
-		time.Sleep(sleepTime)
 	}
 }

main_test.go

@@ -16,7 +16,7 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:    "Success",
 						Command: CommandOrShell{Command: []string{"true"}},
 					},
@@ -28,36 +28,24 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:       "Failure",
 						Command:    CommandOrShell{Command: []string{"false"}},
 						AlertAfter: 1,
 					},
-					&Monitor{
-						Name:       "Failure",
-						Command:    CommandOrShell{Command: []string{"false"}},
-						AlertDown:  []string{"unknown"},
-						AlertAfter: 1,
-					},
 				},
 			},
 			expectErr: false,
-			name:      "Monitor failure, no and unknown alerts",
+			name:      "Monitor failure, no alerts",
 		},
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:       "Success",
 						Command:    CommandOrShell{Command: []string{"ls"}},
 						alertCount: 1,
 					},
-					&Monitor{
-						Name:       "Success",
-						Command:    CommandOrShell{Command: []string{"true"}},
-						AlertUp:    []string{"unknown"},
-						alertCount: 1,
-					},
 				},
 			},
 			expectErr: false,
@@ -66,7 +54,35 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
+						Name:       "Failure",
+						Command:    CommandOrShell{Command: []string{"false"}},
+						AlertDown:  []string{"unknown"},
+						AlertAfter: 1,
+					},
+				},
+			},
+			expectErr: true,
+			name:      "Monitor failure, unknown alerts",
+		},
+		{
+			config: Config{
+				Monitors: []*Monitor{
+					{
+						Name:       "Success",
+						Command:    CommandOrShell{Command: []string{"true"}},
+						AlertUp:    []string{"unknown"},
+						alertCount: 1,
+					},
+				},
+			},
+			expectErr: true,
+			name:      "Monitor recovery, unknown alerts",
+		},
+		{
+			config: Config{
+				Monitors: []*Monitor{
+					{
 						Name:       "Failure",
 						Command:    CommandOrShell{Command: []string{"false"}},
 						AlertDown:  []string{"good"},
@@ -74,7 +90,7 @@ func TestCheckMonitors(t *testing.T) {
 					},
 				},
 				Alerts: map[string]*Alert{
-					"good": &Alert{
+					"good": {
 						Command: CommandOrShell{Command: []string{"true"}},
 					},
 				},
@@ -85,7 +101,7 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:       "Failure",
 						Command:    CommandOrShell{Command: []string{"false"}},
 						AlertDown:  []string{"bad"},
@@ -93,7 +109,7 @@ func TestCheckMonitors(t *testing.T) {
 					},
 				},
 				Alerts: map[string]*Alert{
-					"bad": &Alert{
+					"bad": {
 						Name:    "bad",
 						Command: CommandOrShell{Command: []string{"false"}},
 					},
@@ -105,10 +121,77 @@ func TestCheckMonitors(t *testing.T) {
 	}
 
 	for _, c := range cases {
-		c.config.Init()
+		err := c.config.Init()
-		err := checkMonitors(&c.config)
+		if err != nil {
+			t.Errorf("checkMonitors(%s): unexpected error reading config: %v", c.name, err)
+		}
+
+		err = checkMonitors(&c.config)
 		if err == nil && c.expectErr {
 			t.Errorf("checkMonitors(%s): Expected panic, the code did not panic", c.name)
+		} else if err != nil && !c.expectErr {
+			t.Errorf("checkMonitors(%s): Did not expect an error, but we got one anyway: %v", c.name, err)
+		}
+	}
+}
+
+func TestFirstRunAlerts(t *testing.T) {
+	cases := []struct {
+		config        Config
+		expectErr     bool
+		startupAlerts []string
+		name          string
+	}{
+		{
+			config:        Config{},
+			expectErr:     false,
+			startupAlerts: []string{},
+			name:          "Empty",
+		},
+		{
+			config:        Config{},
+			expectErr:     true,
+			startupAlerts: []string{"missing"},
+			name:          "Unknown",
+		},
+		{
+			config: Config{
+				Alerts: map[string]*Alert{
+					"good": {
+						Command: CommandOrShell{Command: []string{"true"}},
+					},
+				},
+			},
+			expectErr:     false,
+			startupAlerts: []string{"good"},
+			name:          "Successful alert",
+		},
+		{
+			config: Config{
+				Alerts: map[string]*Alert{
+					"bad": {
+						Name:    "bad",
+						Command: CommandOrShell{Command: []string{"false"}},
+					},
+				},
+			},
+			expectErr:     true,
+			startupAlerts: []string{"bad"},
+			name:          "Failed alert",
+		},
+	}
+
+	for _, c := range cases {
+		err := c.config.Init()
+		if err != nil {
+			t.Errorf("sendFirstRunAlerts(%s): unexpected error reading config: %v", c.name, err)
+		}
+
+		err = sendStartupAlerts(&c.config, c.startupAlerts)
+		if err == nil && c.expectErr {
+			t.Errorf("sendFirstRunAlerts(%s): Expected error, the code did not error", c.name)
+		} else if err != nil && !c.expectErr {
+			t.Errorf("sendFirstRunAlerts(%s): Did not expect an error, but we got one anyway: %v", c.name, err)
 		}
 	}
 }

manifest.tmpl

@@ -1,25 +0,0 @@
-image: iamthefij/minitor-go:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}
-{{#if build.tags}}
-tags:
-{{#each build.tags}}
-  - {{this}}
-{{/each}}
-{{/if}}
-manifests:
-  -
-    image: iamthefij/minitor-go:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64
-    platform:
-      architecture: amd64
-      os: linux
-  -
-    image: iamthefij/minitor-go:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64
-    platform:
-      architecture: arm64
-      os: linux
-      variant: v8
-  -
-    image: iamthefij/minitor-go:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm
-    platform:
-      architecture: arm
-      os: linux
-      variant: v7

metrics.go

@@ -19,6 +19,7 @@ import (
 type MinitorMetrics struct {
 	alertCount    *prometheus.CounterVec
 	checkCount    *prometheus.CounterVec
+	checkTime     *prometheus.GaugeVec
 	monitorStatus *prometheus.GaugeVec
 }
 
@@ -40,6 +41,13 @@ func NewMetrics() *MinitorMetrics {
 			},
 			[]string{"monitor", "status", "is_alert"},
 		),
+		checkTime: prometheus.NewGaugeVec(
+			prometheus.GaugeOpts{
+				Name: "minitor_check_milliseconds",
+				Help: "Time in miliseconds that a check ran for",
+			},
+			[]string{"monitor", "status"},
+		),
 		monitorStatus: prometheus.NewGaugeVec(
 			prometheus.GaugeOpts{
 				Name: "minitor_monitor_up_count",
@@ -52,6 +60,7 @@ func NewMetrics() *MinitorMetrics {
 	// Register newly created metrics
 	prometheus.MustRegister(metrics.alertCount)
 	prometheus.MustRegister(metrics.checkCount)
+	prometheus.MustRegister(metrics.checkTime)
 	prometheus.MustRegister(metrics.monitorStatus)
 
 	return metrics
@@ -63,11 +72,12 @@ func (metrics *MinitorMetrics) SetMonitorStatus(monitor string, isUp bool) {
 	if isUp {
 		val = 1.0
 	}
+
 	metrics.monitorStatus.With(prometheus.Labels{"monitor": monitor}).Set(val)
 }
 
 // CountCheck counts the result of a particular Monitor check
-func (metrics *MinitorMetrics) CountCheck(monitor string, isSuccess bool, isAlert bool) {
+func (metrics *MinitorMetrics) CountCheck(monitor string, isSuccess bool, ms int64, isAlert bool) {
 	status := "failure"
 	if isSuccess {
 		status = "success"
@@ -81,6 +91,10 @@ func (metrics *MinitorMetrics) CountCheck(monitor string, isSuccess bool, isAler
 	metrics.checkCount.With(
 		prometheus.Labels{"monitor": monitor, "status": status, "is_alert": alertVal},
 	).Inc()
+
+	metrics.checkTime.With(
+		prometheus.Labels{"monitor": monitor, "status": status},
+	).Set(float64(ms))
 }
 
 // CountAlert counts an alert
@@ -96,6 +110,8 @@ func (metrics *MinitorMetrics) CountAlert(monitor string, alert string) {
 // ServeMetrics starts an http server with a Prometheus metrics handler
 func ServeMetrics() {
 	http.Handle("/metrics", promhttp.Handler())
+
 	host := fmt.Sprintf(":%d", MetricsPort)
+
 	_ = http.ListenAndServe(host, nil)
 }

monitor.go

@@ -1,28 +1,31 @@
 package main
 
 import (
-	"log"
 	"math"
 	"os/exec"
 	"time"
+
+	"git.iamthefij.com/iamthefij/slog"
 )
 
 // Monitor represents a particular periodic check of a command
-type Monitor struct {
+type Monitor struct { //nolint:maligned
 	// Config values
+	AlertAfter    int16             `yaml:"alert_after"`
+	AlertEvery    *int16            `yaml:"alert_every"`
+	CheckInterval SecondsOrDuration `yaml:"check_interval"`
 	Name          string
-	Command       CommandOrShell
 	AlertDown     []string `yaml:"alert_down"`
 	AlertUp       []string `yaml:"alert_up"`
-	CheckInterval float64  `yaml:"check_interval"`
+	Command       CommandOrShell
-	AlertAfter    int16    `yaml:"alert_after"`
+
-	AlertEvery    int16    `yaml:"alert_every"`
 	// Other values
-	lastCheck    time.Time
-	lastOutput   string
 	alertCount        int16
 	failureCount      int16
+	lastCheck         time.Time
 	lastSuccess       time.Time
+	lastOutput        string
+	lastCheckDuration time.Duration
 }
 
 // IsValid returns a boolean indicating if the Monitor has been correctly
@@ -40,8 +43,9 @@ func (monitor Monitor) ShouldCheck() bool {
 		return true
 	}
 
-	sinceLastCheck := time.Now().Sub(monitor.lastCheck).Seconds()
+	sinceLastCheck := time.Since(monitor.lastCheck)
-	return sinceLastCheck >= monitor.CheckInterval
+
+	return sinceLastCheck >= monitor.CheckInterval.Value()
 }
 
 // Check will run the command configured by the Monitor and return a status
@@ -54,11 +58,14 @@ func (monitor *Monitor) Check() (bool, *AlertNotice) {
 		cmd = ShellCommand(monitor.Command.ShellCommand)
 	}
 
+	checkStartTime := time.Now()
 	output, err := cmd.CombinedOutput()
 	monitor.lastCheck = time.Now()
 	monitor.lastOutput = string(output)
+	monitor.lastCheckDuration = monitor.lastCheck.Sub(checkStartTime)
 
 	var alertNotice *AlertNotice
+
 	isSuccess := (err == nil)
 	if isSuccess {
 		alertNotice = monitor.success()
@@ -66,17 +73,11 @@ func (monitor *Monitor) Check() (bool, *AlertNotice) {
 		alertNotice = monitor.failure()
 	}
 
-	if LogDebug {
+	slog.Debugf("Command output: %s", monitor.lastOutput)
-		log.Printf("DEBUG: Command output: %s", monitor.lastOutput)
+	slog.OnErrWarnf(err, "Command result: %v", err)
-	}
-	if err != nil {
-		if LogDebug {
-			log.Printf("DEBUG: Command result: %v", err)
-		}
-	}
 
-	log.Printf(
+	slog.Infof(
-		"INFO: %s success=%t, alert=%t",
+		"%s success=%t, alert=%t",
 		monitor.Name,
 		isSuccess,
 		alertNotice != nil,
@@ -90,11 +91,17 @@ func (monitor Monitor) IsUp() bool {
 	return monitor.alertCount == 0
 }
 
+// LastCheckMilliseconds gives number of miliseconds the last check ran for
+func (monitor Monitor) LastCheckMilliseconds() int64 {
+	return monitor.lastCheckDuration.Milliseconds()
+}
+
 func (monitor *Monitor) success() (notice *AlertNotice) {
 	if !monitor.IsUp() {
 		// Alert that we have recovered
 		notice = monitor.createAlertNotice(true)
 	}
+
 	monitor.failureCount = 0
 	monitor.alertCount = 0
 	monitor.lastSuccess = time.Now()
@@ -106,15 +113,14 @@ func (monitor *Monitor) failure() (notice *AlertNotice) {
 	monitor.failureCount++
 	// If we haven't hit the minimum failures, we can exit
 	if monitor.failureCount < monitor.getAlertAfter() {
-		if LogDebug {
+		slog.Debugf(
-			log.Printf(
+			"%s failed but did not hit minimum failures. "+
-				"DEBUG: %s failed but did not hit minimum failures. "+
 				"Count: %v alert after: %v",
 			monitor.Name,
 			monitor.failureCount,
 			monitor.getAlertAfter(),
 		)
-		}
+
 		return
 	}
 
@@ -122,19 +128,20 @@ func (monitor *Monitor) failure() (notice *AlertNotice) {
 	failureCount := (monitor.failureCount - monitor.getAlertAfter())
 
 	// Use alert cadence to determine if we should alert
-	if monitor.AlertEvery > 0 {
+	switch {
-		// Handle integer number of failures before alerting
+	case monitor.AlertEvery == nil, *monitor.AlertEvery == 0:
-		if failureCount%monitor.AlertEvery == 0 {
-			notice = monitor.createAlertNotice(false)
-		}
-	} else if monitor.AlertEvery == 0 {
 		// Handle alerting on first failure only
 		if failureCount == 0 {
 			notice = monitor.createAlertNotice(false)
 		}
-	} else {
+	case *monitor.AlertEvery > 0:
+		// Handle integer number of failures before alerting
+		if failureCount%*monitor.AlertEvery == 0 {
+			notice = monitor.createAlertNotice(false)
+		}
+	default:
 		// Handle negative numbers indicating an exponential backoff
-		if failureCount >= int16(math.Pow(2, float64(monitor.alertCount))-1) {
+		if failureCount >= int16(math.Pow(2, float64(monitor.alertCount))-1) { //nolint:gomnd
 			notice = monitor.createAlertNotice(false)
 		}
 	}
@@ -144,7 +151,7 @@ func (monitor *Monitor) failure() (notice *AlertNotice) {
 		monitor.alertCount++
 	}
 
-	return
+	return notice
 }
 
 func (monitor Monitor) getAlertAfter() int16 {
@@ -153,6 +160,7 @@ func (monitor Monitor) getAlertAfter() int16 {
 	if monitor.AlertAfter == 0 {
 		return 1
 	}
+
 	return monitor.AlertAfter
 }
 
@@ -161,6 +169,7 @@ func (monitor Monitor) GetAlertNames(up bool) []string {
 	if up {
 		return monitor.AlertUp
 	}
+
 	return monitor.AlertDown
 }
 

monitor_test.go

@@ -22,11 +22,13 @@ func TestMonitorIsValid(t *testing.T) {
 
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
+
 		actual := c.monitor.IsValid()
 		if actual != c.expected {
 			t.Errorf("IsValid(%v), expected=%t actual=%t", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -43,9 +45,9 @@ func TestMonitorShouldCheck(t *testing.T) {
 		name     string
 	}{
 		{Monitor{}, true, "Empty"},
-		{Monitor{lastCheck: timeNow, CheckInterval: 15}, false, "Just checked"},
+		{Monitor{lastCheck: timeNow, CheckInterval: SecondsOrDuration{time.Second * 15}}, false, "Just checked"},
-		{Monitor{lastCheck: timeTenSecAgo, CheckInterval: 15}, false, "-10s"},
+		{Monitor{lastCheck: timeTenSecAgo, CheckInterval: SecondsOrDuration{time.Second * 15}}, false, "-10s"},
-		{Monitor{lastCheck: timeTwentySecAgo, CheckInterval: 15}, true, "-20s"},
+		{Monitor{lastCheck: timeTwentySecAgo, CheckInterval: SecondsOrDuration{time.Second * 15}}, true, "-20s"},
 	}
 
 	for _, c := range cases {
@@ -71,11 +73,13 @@ func TestMonitorIsUp(t *testing.T) {
 
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
+
 		actual := c.monitor.IsUp()
 		if actual != c.expected {
 			t.Errorf("IsUp(%v), expected=%t actual=%t", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -96,11 +100,13 @@ func TestMonitorGetAlertNames(t *testing.T) {
 
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
+
 		actual := c.monitor.GetAlertNames(c.up)
 		if !EqualSliceString(actual, c.expected) {
 			t.Errorf("GetAlertNames(%v), expected=%v actual=%v", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -119,12 +125,15 @@ func TestMonitorSuccess(t *testing.T) {
 
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
+
 		notice := c.monitor.success()
 		hasNotice := (notice != nil)
+
 		if hasNotice != c.expectNotice {
 			t.Errorf("success(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -132,27 +141,32 @@ func TestMonitorSuccess(t *testing.T) {
 // TestMonitorFailureAlertAfter tests that alerts will not trigger until
 // hitting the threshold provided by AlertAfter
 func TestMonitorFailureAlertAfter(t *testing.T) {
+	var alertEvery int16 = 1
+
 	cases := []struct {
 		monitor      Monitor
 		expectNotice bool
 		name         string
 	}{
 		{Monitor{AlertAfter: 1}, true, "Empty"}, // Defaults to true because and AlertEvery default to 0
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 1}, true, "Alert after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery}, true, "Alert after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 1}, true, "Alert after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery}, true, "Alert after 1: second failure"},
-		{Monitor{failureCount: 0, AlertAfter: 20, AlertEvery: 1}, false, "Alert after 20: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 20, AlertEvery: &alertEvery}, false, "Alert after 20: first failure"},
-		{Monitor{failureCount: 19, AlertAfter: 20, AlertEvery: 1}, true, "Alert after 20: 20th failure"},
+		{Monitor{failureCount: 19, AlertAfter: 20, AlertEvery: &alertEvery}, true, "Alert after 20: 20th failure"},
-		{Monitor{failureCount: 20, AlertAfter: 20, AlertEvery: 1}, true, "Alert after 20: 21st failure"},
+		{Monitor{failureCount: 20, AlertAfter: 20, AlertEvery: &alertEvery}, true, "Alert after 20: 21st failure"},
 	}
 
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
+
 		notice := c.monitor.failure()
 		hasNotice := (notice != nil)
+
 		if hasNotice != c.expectNotice {
 			t.Errorf("failure(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -160,6 +174,11 @@ func TestMonitorFailureAlertAfter(t *testing.T) {
 // TestMonitorFailureAlertEvery tests that alerts will trigger
 // on the expected intervals
 func TestMonitorFailureAlertEvery(t *testing.T) {
+	var alertEvery0, alertEvery1, alertEvery2 int16
+	alertEvery0 = 0
+	alertEvery1 = 1
+	alertEvery2 = 2
+
 	cases := []struct {
 		monitor      Monitor
 		expectNotice bool
@@ -174,20 +193,20 @@ func TestMonitorFailureAlertEvery(t *testing.T) {
 
 			For usabilty, this should be consistent. Consistent with what though? minitor-py? Or itself? Dun dun duuuunnnnn!
 		*/
-		{Monitor{AlertAfter: 1}, true, "Empty"}, // Defaults to true because AlertAfter and AlertEvery default to 0
+		{Monitor{AlertAfter: 1}, true, "Empty"}, // Defaults to true because AlertAfter and AlertEvery default to nil
 		// Alert first time only, after 1
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 0}, true, "Alert first time only after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery0}, true, "Alert first time only after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 0}, false, "Alert first time only after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery0}, false, "Alert first time only after 1: second failure"},
-		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: 0}, false, "Alert first time only after 1: third failure"},
+		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: &alertEvery0}, false, "Alert first time only after 1: third failure"},
 		// Alert every time, after 1
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 1}, true, "Alert every time after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery1}, true, "Alert every time after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 1}, true, "Alert every time after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery1}, true, "Alert every time after 1: second failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 1}, true, "Alert every time after 1: third failure"},
+		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: &alertEvery1}, true, "Alert every time after 1: third failure"},
 		// Alert every other time, after 1
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 2}, true, "Alert every other time after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery2}, true, "Alert every other time after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 2}, false, "Alert every other time after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery2}, false, "Alert every other time after 1: second failure"},
-		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: 2}, true, "Alert every other time after 1: third failure"},
+		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: &alertEvery2}, true, "Alert every other time after 1: third failure"},
-		{Monitor{failureCount: 3, AlertAfter: 1, AlertEvery: 2}, false, "Alert every other time after 1: fourth failure"},
+		{Monitor{failureCount: 3, AlertAfter: 1, AlertEvery: &alertEvery2}, false, "Alert every other time after 1: fourth failure"},
 	}
 
 	for _, c := range cases {
@@ -195,10 +214,12 @@ func TestMonitorFailureAlertEvery(t *testing.T) {
 
 		notice := c.monitor.failure()
 		hasNotice := (notice != nil)
+
 		if hasNotice != c.expectNotice {
 			t.Errorf("failure(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -206,6 +227,8 @@ func TestMonitorFailureAlertEvery(t *testing.T) {
 // TestMonitorFailureExponential tests that alerts will trigger
 // with an exponential backoff after repeated failures
 func TestMonitorFailureExponential(t *testing.T) {
+	var alertEveryExp int16 = -1
+
 	cases := []struct {
 		expectNotice bool
 		name         string
@@ -222,16 +245,19 @@ func TestMonitorFailureExponential(t *testing.T) {
 
 	// Unlike previous tests, this one requires a static Monitor with repeated
 	// calls to the failure method
-	monitor := Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: -1}
+	monitor := Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEveryExp}
+
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 
 		notice := monitor.failure()
 		hasNotice := (notice != nil)
+
 		if hasNotice != c.expectNotice {
 			t.Errorf("failure(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }
@@ -243,6 +269,7 @@ func TestMonitorCheck(t *testing.T) {
 		hasNotice  bool
 		lastOutput string
 	}
+
 	cases := []struct {
 		monitor Monitor
 		expect  expected
@@ -290,6 +317,7 @@ func TestMonitorCheck(t *testing.T) {
 			t.Errorf("Check(%v) (output), expected=%v actual=%v", c.name, c.expect.lastOutput, lastOutput)
 			log.Printf("Case failed: %s", c.name)
 		}
+
 		log.Println("-----")
 	}
 }

sample-config.yml

@@ -3,14 +3,14 @@ check_interval: 5
 
 monitors:
   - name: Fake Website
-    command: ['curl', '-s', '-o', '/dev/null', 'https://minitor.mon']
+    command: ["curl", "-s", "-o", "/dev/null", "https://minitor.mon"]
     alert_down: [log_down, mailgun_down, sms_down]
     alert_up: [log_up, email_up]
     check_interval: 10 # Must be at minimum the global `check_interval`
     alert_after: 3
     alert_every: -1 # Defaults to -1 for exponential backoff. 0 to disable repeating
   - name: Real Website
-    command: ['curl', '-s', '-o', '/dev/null', 'https://google.com']
+    command: ["curl", "-s", "-o", "/dev/null", "https://google.com"]
     alert_down: [log_down, mailgun_down, sms_down]
     alert_up: [log_up, email_up]
     check_interval: 5
@@ -23,7 +23,8 @@ alerts:
   log_up:
     command: ["echo", "Minitor recovery for {{.MonitorName}}"]
   email_up:
-    command: [sendmail, "me@minitor.mon", "Recovered: {monitor_name}", "We're back!"]
+    command:
+      [sendmail, "me@minitor.mon", "Recovered: {monitor_name}", "We're back!"]
   mailgun_down:
     command: >
       curl -s -X POST

scripts/curl_ok.sh

@@ -0,0 +1,6 @@
+#! /bin/sh
+
+# Used for a basic HTTP health check
+# Avoids output from non-errors and will fail if the HTTP response is unsuccessful
+
+curl --silent --show-error --fail -o /dev/null "$@"

scripts/docker_check.sh

@@ -11,6 +11,7 @@ set -e
 # To override, export DOCKER_HOST to a new hostname
 DOCKER_HOST="${DOCKER_HOST:=socket}"
 container_name="$1"
+num_log_lines="$2"
 
 # Curls Docker either using a socket or URL
 function curl_docker {
@@ -31,21 +32,32 @@ function get_container_id {
 
 # Returns container JSON
 function inspect_container {
-    local container_id=$1
+    local container_id="$1"
     curl_docker "containers/$container_id/json"
 }
 
+# Gets some lines from docker log
+function get_logs {
+    container_id="$1"
+    num_lines="$2"
+    curl_docker "containers/$container_id/logs?stdout=1&stderr=1" | tail -n "$num_lines"
+}
+
 if [ -z "$container_name" ]; then
-    echo "Usage: $0 container_name"
+    echo "Usage: $0 container_name [num_log_lines]"
     echo "Will exit with the last status code of continer with provided name"
     exit 1
 fi
 
-container_id=$(get_container_id $container_name)
+container_id=$(get_container_id "$container_name")
 if [ -z "$container_id" ]; then
     echo "ERROR: Could not find container with name: $container_name"
     exit 1
 fi
 exit_code=$(inspect_container "$container_id" | jq -r .State.ExitCode)
 
+if [ -n "$num_log_lines" ]; then
+    get_logs "$container_id" "$num_log_lines"
+fi
+
 exit "$exit_code"

scripts/docker_healthcheck.sh

@@ -11,6 +11,7 @@ set -e
 # To override, export DOCKER_HOST to a new hostname
 DOCKER_HOST="${DOCKER_HOST:=socket}"
 container_name="$1"
+num_log_lines="$2"
 
 # Curls Docker either using a socket or URL
 function curl_docker {
@@ -35,8 +36,15 @@ function inspect_container {
     curl_docker "containers/$container_id/json"
 }
 
+# Gets some lines from docker log
+function get_logs {
+    container_id="$1"
+    num_lines="$2"
+    curl_docker "containers/$container_id/logs?stdout=1&stderr=1" | tail -n "$num_lines"
+}
+
 if [ -z "$container_name" ]; then
-    echo "Usage: $0 container_name"
+    echo "Usage: $0 container_name [num_log_lines]"
     echo "Will return results of healthcheck for continer with provided name"
     exit 1
 fi
@@ -48,6 +56,10 @@ if [ -z "$container_id" ]; then
 fi
 health=$(inspect_container "$container_id" | jq -r '.State.Health.Status')
 
+if [ -n "$num_log_lines" ]; then
+    get_logs "$container_id" "$num_log_lines"
+fi
+
 case "$health" in
     null)
         echo "No healthcheck results"

test/valid-config-default-values.yml

@@ -0,0 +1,12 @@
+---
+check_interval: 1
+default_alert_down: ["log_command"]
+default_alert_after: 1
+
+monitors:
+  - name: Command
+    command: ["echo", "$PATH"]
+
+alerts:
+  log_command:
+    command: ["echo", "regular", '"command!!!"', "{{.MonitorName}}"]

test/valid-config.yml

@@ -3,21 +3,23 @@ check_interval: 1
 
 monitors:
   - name: Command
-    command: ['echo', '$PATH']
+    command: ["echo", "$PATH"]
-    alert_down: ['log_command', 'log_shell']
+    alert_down: ["log_command", "log_shell"]
     alert_every: 0
+    check_interval: 10s
   - name: Shell
     command: >
       echo 'Some string with stuff';
       echo 'another line';
       echo $PATH;
       exit 1
-    alert_down: ['log_command', 'log_shell']
+    alert_down: ["log_command", "log_shell"]
     alert_after: 5
     alert_every: 0
+    check_interval: 1m
 
 alerts:
   log_command:
-    command: ['echo', 'regular', '"command!!!"', "{{.MonitorName}}"]
+    command: ["echo", "regular", '"command!!!"', "{{.MonitorName}}"]
   log_shell:
     command: echo "Failure on {{.MonitorName}} User is $USER"

util.go

@@ -8,7 +8,7 @@ import (
 // ShellCommand takes a string and executes it as a command using `sh`
 func ShellCommand(command string) *exec.Cmd {
 	shellCommand := []string{"sh", "-c", strings.TrimSpace(command)}
-	//log.Printf("Shell command: %v", shellCommand)
+
 	return exec.Command(shellCommand[0], shellCommand[1:]...)
 }
 
@@ -17,10 +17,12 @@ func EqualSliceString(a, b []string) bool {
 	if len(a) != len(b) {
 		return false
 	}
+
 	for i, val := range a {
 		if val != b[i] {
 			return false
 		}
 	}
+
 	return true
 }