Adds ability to run specified alerts on startup

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
@@ -48,11 +30,35 @@ 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: compress binaries for release
+    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: push image - arm
     image: plugins/docker
@@ -104,15 +110,27 @@ steps:
       password:
         from_secret: docker_password
 
+---
+kind: pipeline
+name: notify
+
+depends_on:
+  - test
+  - publish
+
+trigger:
+  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 +1,11 @@
 ARG REPO=library
-FROM multiarch/qemu-user-static:4.2.0-2 as qemu-user-static
+FROM ${REPO}/alpine:3.18
-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~=2023c
 
 # Add minitor user for running as non-root
 RUN addgroup -S minitor && adduser -S minitor -G minitor

Dockerfile.multi-stage

@@ -1,7 +1,5 @@
 ARG REPO=library
-FROM golang:1.12-alpine AS builder
+FROM golang:1.20 AS builder
-
-RUN apk add --no-cache git=~2
 
 RUN mkdir /app
 WORKDIR /app
@@ -16,7 +14,7 @@ ARG VERSION=dev
 ENV CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH}
 RUN go build -ldflags "-X main.version=${VERSION}" -a -installsuffix nocgo -o minitor .
 
-FROM ${REPO}/alpine:3.10
+FROM ${REPO}/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~=2023c
 
 # 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))

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 +96,28 @@ 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).
+
 ### 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 +134,7 @@ 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 +166,25 @@ 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+fmt.Sprint(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

@@ -2,17 +2,24 @@ 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"`
-	Monitors      []*Monitor
+	DefaultAlertAfter int16             `yaml:"default_alert_after"`
-	Alerts        map[string]*Alert
+	DefaultAlertEvery *int16            `yaml:"default_alert_every"`
+	DefaultAlertDown  []string          `yaml:"default_alert_down"`
+	DefaultAlertUp    []string          `yaml:"default_alert_up"`
+	Monitors          []*Monitor
+	Alerts            map[string]*Alert
 }
 
 // CommandOrShell type wraps a string or list of strings
@@ -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() {
+	// 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

@@ -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 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+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
@@ -23,57 +23,67 @@ 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,
+		)
+
+		return nil
+	}
+
+	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 {
+	// 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, hasAlert)
+			Metrics.CountCheck(monitor.Name, success, monitor.LastCheckMilliseconds(), hasAlert)
 
-			// Should probably consider refactoring everything below here
 			if alertNotice != nil {
-				if LogDebug {
+				err := sendAlerts(config, monitor, alertNotice)
-					log.Printf("DEBUG: Recieved an alert notice from %s", alertNotice.MonitorName)
+				// If there was an error in sending an alert, exit early and bubble it up
-				}
+				if err != nil {
-				alertNames := monitor.GetAlertNames(alertNotice.IsUp)
+					return err
-				if alertNames == nil {
-					// This should only happen for a recovery alert. AlertDown is validated not empty
-					log.Printf(
-						"WARNING: Recieved 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 {
-							log.Printf(
-								"ERROR: 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
-						log.Printf("ERROR: Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
-						return fmt.Errorf("Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
-					}
 				}
 			}
 		}
@@ -82,42 +92,76 @@ func checkMonitors(config *Config) error {
 	return nil
 }
 
+func sendFirstRunAlerts(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)")
+	firstRunAlerts := flag.String("first-run-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
 	}
 
 	// 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 *firstRunAlerts != "" {
+		alertNames := strings.Split(*firstRunAlerts, ",")
+
+		err = sendFirstRunAlerts(&config, alertNames)
+
+		slog.OnErrPanicf(err, "Error running first run 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
+		firstRunAlerts []string
+		name           string
+	}{
+		{
+			config:         Config{},
+			expectErr:      false,
+			firstRunAlerts: []string{},
+			name:           "Empty",
+		},
+		{
+			config:         Config{},
+			expectErr:      true,
+			firstRunAlerts: []string{"missing"},
+			name:           "Unknown",
+		},
+		{
+			config: Config{
+				Alerts: map[string]*Alert{
+					"good": {
+						Command: CommandOrShell{Command: []string{"true"}},
+					},
+				},
+			},
+			expectErr:      false,
+			firstRunAlerts: []string{"good"},
+			name:           "Successful alert",
+		},
+		{
+			config: Config{
+				Alerts: map[string]*Alert{
+					"bad": {
+						Name:    "bad",
+						Command: CommandOrShell{Command: []string{"false"}},
+					},
+				},
+			},
+			expectErr:      true,
+			firstRunAlerts: []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 = sendFirstRunAlerts(&c.config, c.firstRunAlerts)
+		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)
 		}
 	}
 }

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
+	alertCount        int16
-	lastOutput   string
+	failureCount      int16
-	alertCount   int16
+	lastCheck         time.Time
-	failureCount int16
+	lastSuccess       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",
-					"Count: %v alert after: %v",
+			monitor.Name,
-				monitor.Name,
+			monitor.failureCount,
-				monitor.failureCount,
+			monitor.getAlertAfter(),
-				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`
+    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

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 "$@"

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
 }