Add more liniting and update to pass

.gitignore

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

.golangci.yml

@@ -0,0 +1,48 @@
+---
+linters:
+  enable:
+    - asciicheck
+    - bodyclose
+    - dogsled
+    - dupl
+    - exhaustive
+    - gochecknoinits
+    - gocognit
+    - gocritic
+    - gocyclo
+    - goerr113
+    - gofumpt
+    - goimports
+    - gomnd
+    - goprintffuncname
+    # - gosec
+    # - ifshort
+    - interfacer
+    - maligned
+    - misspell
+    - nakedret
+    - nestif
+    - nlreturn
+    - noctx
+    - unparam
+    - wsl
+    # - errorlint
+  disable:
+    - gochecknoglobals
+
+linters-settings:
+  gosec:
+    excludes:
+      - G204
+#   gomnd:
+#     settings:
+#       mnd:
+#         ignored-functions: math.*
+
+issues:
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - errcheck
+        - gosec
+        - maligned

.pre-commit-config.yaml

@@ -1,7 +1,7 @@
 ---
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.4.0
+    rev: v3.4.0
     hooks:
       - id: check-added-large-files
       - id: check-yaml
@@ -11,12 +11,11 @@ repos:
       - id: end-of-file-fixer
       - id: check-merge-conflict
   - repo: git://github.com/dnephin/pre-commit-golang
-    rev: v0.3.5
+    rev: v0.4.0
     hooks:
       - id: go-fmt
       - id: go-imports
-      # - id: gometalinter
+      - id: golangci-lint
-      # - id: golangci-lint
   # - repo: https://github.com/IamTheFij/docker-pre-commit
   #   rev: v2.0.0
   #   hooks:

alert.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"os/exec"
 	"strings"
@@ -11,6 +12,13 @@ import (
 	"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
 type Alert struct {
 	Name                 string
@@ -21,12 +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
@@ -49,26 +57,30 @@ func (alert *Alert) BuildTemplates() error {
 
 	slog.Debugf("Building template for alert %s", alert.Name)
 
-	if alert.commandTemplate == nil && alert.Command.Command != 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+fmt.Sprint(i)).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),
 		)
-	} 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
@@ -79,28 +91,37 @@ func (alert Alert) Send(notice AlertNotice) (outputStr string, err error) {
 	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
 	}
 
@@ -114,6 +135,15 @@ func (alert Alert) Send(notice AlertNotice) (outputStr string, err error) {
 	outputStr = string(output)
 	slog.Debugf("Alert output for: %s\n---\n%s\n---", alert.Name, outputStr)
 
+	if err != nil {
+		err = fmt.Errorf(
+			"Alert '%s' failed to send. Returned %v: %w",
+			alert.Name,
+			err,
+			ErrAlertFailed,
+		)
+	}
+
 	return outputStr, err
 }
 

alert_test.go

@@ -123,6 +123,7 @@ func TestAlertSend(t *testing.T) {
 
 		// Set PyCompat back to default value
 		PyCompat = false
+
 		log.Println("-----")
 	}
 }

config.go

@@ -8,6 +8,8 @@ import (
 	"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"`
@@ -35,14 +37,17 @@ 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
 }
 
@@ -57,11 +62,14 @@ func (config Config) IsValid() (isValid bool) {
 
 		isValid = false
 	}
+
 	for _, alert := range config.Alerts {
 		if !alert.IsValid() {
-			slog.Errorf("Invalid alert configuration: %s", alert.Name)
+			slog.Errorf("Invalid alert configuration: %+v", alert.Name)
 
 			isValid = false
+		} else {
+			slog.Debugf("Loaded alert %s", alert.Name)
 		}
 	}
 
@@ -71,6 +79,7 @@ func (config Config) IsValid() (isValid bool) {
 
 		isValid = false
 	}
+
 	for _, monitor := range config.Monitors {
 		if !monitor.IsValid() {
 			slog.Errorf("Invalid monitor configuration: %s", monitor.Name)
@@ -85,13 +94,14 @@ func (config Config) IsValid() (isValid bool) {
 						"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
@@ -122,22 +132,26 @@ func LoadConfig(filePath string) (config Config, err error) {
 
 	// 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() {
+	// Finish initializing configuration
-		err = errors.New("Invalid configuration")
+	if err = config.Init(); err != nil {
 		return
 	}
 
-	// Finish initializing configuration
+	if !config.IsValid() {
-	err = config.Init()
+		err = errInvalidConfig
 
-	return
+		return
+	}
+
+	return config, err
 }

config_test.go

@@ -27,12 +27,15 @@ 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("-----")
 	}
 }
@@ -41,6 +44,7 @@ func TestLoadConfig(t *testing.T) {
 // 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 +52,10 @@ 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 +66,15 @@ 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 +85,10 @@ 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 +99,12 @@ 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")

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
 	"time"
@@ -21,8 +22,49 @@ var (
 
 	// version of minitor being run
 	version = "dev"
+
+	errUnknownAlert = errors.New("unknown alert")
 )
 
+func sendAlerts(config *Config, monitor *Monitor, alertNotice *AlertNotice) error {
+	slog.Debugf("Received 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
+		slog.Warningf(
+			"Received alert, but no alert mechanisms exist. MonitorName=%s IsUp=%t",
+			alertNotice.MonitorName, alertNotice.IsUp,
+		)
+	}
+
+	for _, alertName := range alertNames {
+		if alert, ok := config.Alerts[alertName]; ok {
+			output, err := alert.Send(*alertNotice)
+			if err != nil {
+				slog.Errorf(
+					"Alert '%s' failed. result=%v: output=%s",
+					alert.Name,
+					err,
+					output,
+				)
+
+				return err
+			}
+
+			// Count alert metrics
+			Metrics.CountAlert(monitor.Name, alert.Name)
+		} else {
+			// This case should never actually happen since we validate against it
+			slog.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 {
 	for _, monitor := range config.Monitors {
 		if monitor.ShouldCheck() {
@@ -34,44 +76,8 @@ func checkMonitors(config *Config) error {
 			Metrics.SetMonitorStatus(monitor.Name, monitor.IsUp())
 			Metrics.CountCheck(monitor.Name, success, hasAlert)
 
-			// Should probably consider refactoring everything below here
 			if alertNotice != nil {
-				slog.Debugf("Received an alert notice from %s", alertNotice.MonitorName)
+				return sendAlerts(config, monitor, alertNotice)
-				alertNames := monitor.GetAlertNames(alertNotice.IsUp)
-				if alertNames == nil {
-					// This should only happen for a recovery alert. AlertDown is validated not empty
-					slog.Warningf(
-						"Received alert, but no alert mechanisms exist. MonitorName=%s IsUp=%t",
-						alertNotice.MonitorName, alertNotice.IsUp,
-					)
-				}
-				for _, alertName := range alertNames {
-					if alert, ok := config.Alerts[alertName]; ok {
-						output, err := alert.Send(*alertNotice)
-						if err != nil {
-							slog.Errorf(
-								"Alert '%s' failed. result=%v: output=%s",
-								alert.Name,
-								err,
-								output,
-							)
-							return fmt.Errorf(
-								"Unsuccessfully triggered alert '%s'. "+
-									"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
-						slog.Errorf("Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
-
-						return fmt.Errorf("Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
-					}
-				}
 			}
 		}
 	}

metrics.go

@@ -63,6 +63,7 @@ func (metrics *MinitorMetrics) SetMonitorStatus(monitor string, isUp bool) {
 	if isUp {
 		val = 1.0
 	}
+
 	metrics.monitorStatus.With(prometheus.Labels{"monitor": monitor}).Set(val)
 }
 
@@ -96,6 +97,8 @@ 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

@@ -9,21 +9,22 @@ import (
 )
 
 // 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 float64 `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
 }
 
 // IsValid returns a boolean indicating if the Monitor has been correctly
@@ -42,6 +43,7 @@ func (monitor Monitor) ShouldCheck() bool {
 	}
 
 	sinceLastCheck := time.Since(monitor.lastCheck).Seconds()
+
 	return sinceLastCheck >= monitor.CheckInterval
 }
 
@@ -60,6 +62,7 @@ func (monitor *Monitor) Check() (bool, *AlertNotice) {
 	monitor.lastOutput = string(output)
 
 	var alertNotice *AlertNotice
+
 	isSuccess := (err == nil)
 	if isSuccess {
 		alertNotice = monitor.success()
@@ -90,6 +93,7 @@ func (monitor *Monitor) success() (notice *AlertNotice) {
 		// Alert that we have recovered
 		notice = monitor.createAlertNotice(true)
 	}
+
 	monitor.failureCount = 0
 	monitor.alertCount = 0
 	monitor.lastSuccess = time.Now()
@@ -116,19 +120,20 @@ 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 {
+	case monitor.AlertEvery > 0:
 		// Handle integer number of failures before alerting
 		if failureCount%monitor.AlertEvery == 0 {
 			notice = monitor.createAlertNotice(false)
 		}
-	} else if monitor.AlertEvery == 0 {
+	case monitor.AlertEvery == 0:
 		// Handle alerting on first failure only
 		if failureCount == 0 {
 			notice = monitor.createAlertNotice(false)
 		}
-	} else {
+	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)
 		}
 	}
@@ -138,7 +143,7 @@ func (monitor *Monitor) failure() (notice *AlertNotice) {
 		monitor.alertCount++
 	}
 
-	return
+	return notice
 }
 
 func (monitor Monitor) getAlertAfter() int16 {
@@ -147,6 +152,7 @@ func (monitor Monitor) getAlertAfter() int16 {
 	if monitor.AlertAfter == 0 {
 		return 1
 	}
+
 	return monitor.AlertAfter
 }
 
@@ -155,6 +161,7 @@ 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("-----")
 	}
 }
@@ -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("-----")
 	}
 }
@@ -147,12 +156,15 @@ func TestMonitorFailureAlertAfter(t *testing.T) {
 
 	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("-----")
 	}
 }
@@ -195,10 +207,12 @@ 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("-----")
 	}
 }
@@ -223,15 +237,18 @@ 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}
+
 	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 +260,7 @@ func TestMonitorCheck(t *testing.T) {
 		hasNotice  bool
 		lastOutput string
 	}
+
 	cases := []struct {
 		monitor Monitor
 		expect  expected
@@ -290,6 +308,7 @@ 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`
+    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
+    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

util.go

@@ -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
 }