.gitignore

@@ -0,0 +1,2 @@
+watchdog
+generated-version.go

README.md

@@ -16,7 +16,9 @@ Git:
 ```bash
 git clone https://git.coolaj86.com/coolaj86/watchdog.go.git
 pushd watchdog.go/
-go build -o bin/watchdog
+go generate -mod=vendor ./...
+pushd cmd/watchdog
+go build -mod=vendor
 ```
 
 Zip:

build.go

@@ -0,0 +1,8 @@
+//go:generate go build -o watchdog cmd/watchdog/watchdog.go
+
+package watchdog
+
+// This is takes the place of a makefile.
+
+// Usage:
+// go generate -mod=vendor build.go

cmd/watchdog/watchdog.go

@@ -0,0 +1,117 @@
+//go:generate go run ../../tools/version/version.go
+
+// Watchdog Binary
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+
+	watchdog "git.rootprojects.org/root/watchdog.go"
+)
+
+var (
+	Version   = "v0.0.0"
+	GitRev    = "00000000"
+	Timestamp = "0000-00-00T00:00:00Z"
+)
+
+func usage() {
+	fmt.Println("Usage: watchdog -c config.json")
+}
+
+func main() {
+	for i := range os.Args {
+		switch {
+		case strings.HasSuffix(os.Args[i], "version"):
+			fmt.Println(Timestamp)
+			fmt.Println(Version)
+			fmt.Println(GitRev)
+			os.Exit(0)
+		case strings.HasSuffix(os.Args[i], "help"):
+			usage()
+			os.Exit(0)
+		}
+	}
+
+	if 3 != len(os.Args) {
+		usage()
+		os.Exit(1)
+		return
+	}
+	if "-c" != os.Args[1] {
+		usage()
+		os.Exit(1)
+		return
+	}
+
+	filename := os.Args[2]
+	f, err := os.Open(filename)
+	if nil != err {
+		log.Fatal(err)
+		return
+	}
+
+	configFile, err := ioutil.ReadAll(f)
+	if nil != err {
+		log.Fatal(err)
+		return
+	}
+
+	config := &watchdog.Config{}
+	err = json.Unmarshal(configFile, config)
+	if nil != err {
+		log.Fatal(err)
+		return
+	}
+
+	//fmt.Printf("%#v\n", config)
+
+	done := make(chan struct{}, 1)
+
+	allWebhooks := make(map[string]watchdog.ConfigWebhook)
+
+	for i := range config.Webhooks {
+		h := config.Webhooks[i]
+		allWebhooks[h.Name] = h
+	}
+
+	logQueue := make(chan string, 10)
+	go logger(logQueue)
+	for i := range config.Watches {
+		c := config.Watches[i]
+		logQueue <- fmt.Sprintf("Watching '%s'", c.Name)
+		go func(c watchdog.ConfigWatch) {
+			d := watchdog.New(&watchdog.Dog{
+				Name:        c.Name,
+				CheckURL:    c.URL,
+				Keywords:    c.Keywords,
+				Recover:     c.RecoverScript,
+				Webhooks:    c.Webhooks,
+				AllWebhooks: allWebhooks,
+				Logger:      logQueue,
+			})
+			d.Watch()
+		}(config.Watches[i])
+	}
+
+	if 0 == len(config.Watches) {
+		log.Fatal("Nothing to watch")
+		return
+	}
+
+	<-done
+}
+
+// This is so that the log messages don't trample
+// over each other when they happen simultaneously.
+func logger(msgs chan string) {
+	for {
+		msg := <-msgs
+		log.Println(msg)
+	}
+}

doc.go

@@ -4,4 +4,6 @@
 // The watchdog package is meant to be used as a binary only.
 // The git tag version describes the state of the binary,
 // not the state of the library. The API is not yet stable.
+//
+// See https://git.rootproject.org/root/watchdog.go for pre-built binaries.
 package watchdog

tools/version/version.go

@@ -0,0 +1,123 @@
+// +build tools
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/format"
+	"os"
+	"os/exec"
+	"regexp"
+	"strconv"
+	"strings"
+	"text/template"
+	"time"
+)
+
+var exactVer *regexp.Regexp
+var gitVer *regexp.Regexp
+var verFile = "generated-version.go"
+
+func init() {
+	// exactly vX.Y.Z (go-compatible semver)
+	exactVer = regexp.MustCompile(`^v\d+\.\d+\.\d+$`)
+
+	// vX.Y.Z-n-g0000000 git post-release, semver prerelease
+	gitVer = regexp.MustCompile(`^(v\d+\.\d+)\.(\d+)-(\d+)-g`)
+}
+
+// Goal: Either use an exact version like v1.0.0
+//       or translate the git version like v1.0.0-4-g0000000
+//       to a semver like v1.0.1-pre4+g0000000
+//       Don't fail when git repo isn't available.
+func main() {
+	desc := gitDesc()
+	rev := gitRev()
+	ver := semVer(desc)
+	ts := time.Now().Format(time.RFC3339)
+
+	v := struct {
+		Timestamp string
+		Version   string
+		GitRev    string
+	}{
+		Timestamp: ts,
+		Version:   ver,
+		GitRev:    rev,
+	}
+
+	// Create or overwrite the go file from template
+	var buf bytes.Buffer
+	if err := versionTpl.Execute(&buf, v); nil != err {
+		panic(err)
+	}
+
+	// Format
+	src, err := format.Source(buf.Bytes())
+	if nil != err {
+		panic(err)
+	}
+
+	// Write to disk (in the Current Working Directory)
+	f, err := os.Create(verFile)
+	if nil != err {
+		panic(err)
+	}
+	if _, err := f.Write(src); nil != err {
+		panic(err)
+	}
+	if err := f.Close(); nil != err {
+		panic(err)
+	}
+}
+
+func gitDesc() string {
+	args := strings.Split("git describe --tags --dirty --always", " ")
+	cmd := exec.Command(args[0], args[1:]...)
+	out, err := cmd.CombinedOutput()
+	if nil != err {
+		// Don't panic, just carry on
+		out = []byte("v0.0.0-0-g0000000")
+	}
+	return strings.TrimSpace(string(out))
+}
+
+func gitRev() string {
+	args := strings.Split("git rev-parse HEAD", " ")
+	cmd := exec.Command(args[0], args[1:]...)
+	out, err := cmd.CombinedOutput()
+	if nil != err {
+		// Don't panic, just carry on
+		out = []byte("00000000000000000")
+	}
+	return strings.TrimSpace(string(out))
+}
+
+func semVer(desc string) string {
+	var ver string
+	if exactVer.MatchString(desc) {
+		// v1.0.0
+		ver = desc
+	} else if gitVer.MatchString(desc) {
+		// ((v1.0).(0)-(1))
+		vers := gitVer.FindStringSubmatch(desc)
+		patch, err := strconv.Atoi(vers[2])
+		if nil != err {
+			panic(err)
+		}
+		// v1.0.1-pre1
+		ver = fmt.Sprintf("%s.%d-pre%s", vers[1], patch+1, vers[3])
+	}
+	return ver
+}
+
+var versionTpl = template.Must(template.New("").Parse(`// Code generated by go generate; DO NOT EDIT.
+package main
+
+func init() {
+	Timestamp = "{{ .Timestamp }}"
+	Version = "{{ .Version }}"
+	GitRev = "{{ .GitRev }}"
+}
+`))

watchdog.go

@@ -1,4 +1,4 @@
-package main
+package watchdog
 
 import (
 	"bytes"
@@ -6,90 +6,14 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
-	"log"
 	"net"
 	"net/http"
 	"net/url"
-	"os"
 	"os/exec"
 	"strings"
 	"time"
 )
 
-func usage() {
-	fmt.Println("Usage: watchdog -c config.json")
-}
-
-func main() {
-	if 3 != len(os.Args) {
-		usage()
-		os.Exit(1)
-		return
-	}
-	if "-c" != os.Args[1] {
-		usage()
-		os.Exit(1)
-		return
-	}
-
-	filename := os.Args[2]
-	f, err := os.Open(filename)
-	if nil != err {
-		log.Fatal(err)
-		return
-	}
-
-	configFile, err := ioutil.ReadAll(f)
-	if nil != err {
-		log.Fatal(err)
-		return
-	}
-
-	config := &Config{}
-	err = json.Unmarshal(configFile, config)
-	if nil != err {
-		log.Fatal(err)
-		return
-	}
-
-	//fmt.Printf("%#v\n", config)
-
-	done := make(chan struct{}, 1)
-
-	allWebhooks := make(map[string]ConfigWebhook)
-
-	for i := range config.Webhooks {
-		h := config.Webhooks[i]
-		allWebhooks[h.Name] = h
-	}
-
-	logQueue := make(chan string, 10)
-	go logger(logQueue)
-	for i := range config.Watches {
-		c := config.Watches[i]
-		logQueue <- fmt.Sprintf("Watching '%s'", c.Name)
-		go func(c ConfigWatch) {
-			d := New(&Dog{
-				Name:        c.Name,
-				CheckURL:    c.URL,
-				Keywords:    c.Keywords,
-				Recover:     c.RecoverScript,
-				Webhooks:    c.Webhooks,
-				AllWebhooks: allWebhooks,
-				logger:      logQueue,
-			})
-			d.Watch()
-		}(config.Watches[i])
-	}
-
-	if 0 == len(config.Watches) {
-		log.Fatal("Nothing to watch")
-		return
-	}
-
-	<-done
-}
-
 type Dog struct {
 	Name         string
 	CheckURL     string
@@ -97,7 +21,7 @@ type Dog struct {
 	Recover      string
 	Webhooks     []string
 	AllWebhooks  map[string]ConfigWebhook
-	logger       chan string
+	Logger       chan string
 	error        error
 	failures     int
 	passes       int
@@ -121,13 +45,22 @@ func (d *Dog) Watch() {
 }
 
 func (d *Dog) watch() {
-	d.logger <- fmt.Sprintf("Check: '%s'", d.Name)
+	d.Logger <- fmt.Sprintf("Check: '%s'", d.Name)
 
 	err := d.check()
 	if nil == err {
 		return
 	}
 
+	time.Sleep(time.Duration(2) * time.Second)
+	err2 := d.check()
+	if nil != err {
+		d.Logger <- fmt.Sprintf("Down: '%s': %s", d.Name, err2)
+	} else {
+		d.Logger <- fmt.Sprintf("Hiccup: '%s': %s", d.Name, err)
+		return
+	}
+
 	failure := false
 	t := 10
 	for {
@@ -137,6 +70,7 @@ func (d *Dog) watch() {
 		t *= 2
 		err := d.check()
 		if nil != err {
+			d.Logger <- fmt.Sprintf("Unrecoverable: '%s': %s", d.Name, err)
 			failure = true
 		} else {
 			failure = false
@@ -183,11 +117,11 @@ func (d *Dog) check() error {
 
 	if !bytes.Contains(b, []byte(d.Keywords)) {
 		err = fmt.Errorf("Down: '%s' Not Found for '%s'", d.Keywords, d.Name)
-		d.logger <- fmt.Sprintf("%s", err)
+		d.Logger <- fmt.Sprintf("%s", err)
 		d.error = err
 		return err
 	} else {
-		d.logger <- fmt.Sprintf("Up: '%s'", d.Name)
+		d.Logger <- fmt.Sprintf("Up: '%s'", d.Name)
 	}
 
 	return nil
@@ -203,25 +137,25 @@ func (d *Dog) recover() {
 	pipe, err := cmd.StdinPipe()
 	pipe.Write([]byte(d.Recover))
 	if nil != err {
-		d.logger <- fmt.Sprintf("[Recover] Could not write to bash '%s': %s", d.Recover, err)
+		d.Logger <- fmt.Sprintf("[Recover] Could not write to bash '%s': %s", d.Recover, err)
 	}
 	err = cmd.Start()
 	if nil != err {
-		d.logger <- fmt.Sprintf("[Recover] Could not start '%s': %s", d.Recover, err)
+		d.Logger <- fmt.Sprintf("[Recover] Could not start '%s': %s", d.Recover, err)
 	}
 	err = pipe.Close()
 	if nil != err {
-		d.logger <- fmt.Sprintf("[Recover] Could not close '%s': %s", d.Recover, err)
+		d.Logger <- fmt.Sprintf("[Recover] Could not close '%s': %s", d.Recover, err)
 	}
 	err = cmd.Wait()
 	cancel()
 	if nil != err {
-		d.logger <- fmt.Sprintf("[Recover] '%s' failed for '%s': %s", d.Recover, d.Name, err)
+		d.Logger <- fmt.Sprintf("[Recover] '%s' failed for '%s': %s", d.Recover, d.Name, err)
 	}
 }
 
 func (d *Dog) notify(hardFail bool) {
-	d.logger <- fmt.Sprintf("Notifying the authorities of %s's failure", d.Name)
+	d.Logger <- fmt.Sprintf("Notifying the authorities of %s's failure", d.Name)
 	d.lastNotified = time.Now()
 
 	for i := range d.Webhooks {
@@ -234,7 +168,7 @@ func (d *Dog) notify(hardFail bool) {
 		if !ok {
 			// TODO check in main when config is read
 			d.Webhooks[i] = ""
-			d.logger <- fmt.Sprintf("[Warning] Could not find webhook '%s' for '%s'", name, h.Name)
+			d.Logger <- fmt.Sprintf("[Warning] Could not find webhook '%s' for '%s'", name, h.Name)
 			continue
 		}
 
@@ -253,14 +187,14 @@ func (d *Dog) notify(hardFail bool) {
 				// because `{{` gets urlencoded
 				//k = strings.Replace(k, "{{ .Name }}", d.Name, -1)
 				v = strings.Replace(v, "{{ .Name }}", d.Name, -1)
-				d.logger <- fmt.Sprintf("[HEADER] %s: %s", k, v)
+				d.Logger <- fmt.Sprintf("[HEADER] %s: %s", k, v)
 				form.Set(k, v)
 			}
 			body = strings.NewReader(form.Encode())
 		} else if 0 != len(h.JSON) {
 			bodyBuf, err := json.Marshal(h.JSON)
 			if nil != err {
-				d.logger <- fmt.Sprintf("[Notify] JSON Marshal Error for '%s': %s", h.Name, err)
+				d.Logger <- fmt.Sprintf("[Notify] JSON Marshal Error for '%s': %s", h.Name, err)
 				continue
 			}
 			// `{{` should be left alone
@@ -270,7 +204,7 @@ func (d *Dog) notify(hardFail bool) {
 		client := NewHTTPClient()
 		req, err := http.NewRequest(h.Method, h.URL, body)
 		if nil != err {
-			d.logger <- fmt.Sprintf("[Notify] HTTP Client Network Error for '%s': %s", h.Name, err)
+			d.Logger <- fmt.Sprintf("[Notify] HTTP Client Network Error for '%s': %s", h.Name, err)
 			continue
 		}
 
@@ -299,12 +233,12 @@ func (d *Dog) notify(hardFail bool) {
 
 		resp, err := client.Do(req)
 		if nil != err {
-			d.logger <- fmt.Sprintf("[Notify] HTTP Client Error for '%s': %s", h.Name, err)
+			d.Logger <- fmt.Sprintf("[Notify] HTTP Client Error for '%s': %s", h.Name, err)
 			continue
 		}
 
 		if !(resp.StatusCode >= 200 && resp.StatusCode < 300) {
-			d.logger <- fmt.Sprintf("[Notify] Response Error for '%s': %s", h.Name, resp.Status)
+			d.Logger <- fmt.Sprintf("[Notify] Response Error for '%s': %s", h.Name, resp.Status)
 			continue
 		}
 
@@ -314,12 +248,12 @@ func (d *Dog) notify(hardFail bool) {
 		decoder := json.NewDecoder(resp.Body)
 		err = decoder.Decode(&data)
 		if err != nil {
-			d.logger <- fmt.Sprintf("[Notify] Response Body Error for '%s': %s", h.Name, resp.Status)
+			d.Logger <- fmt.Sprintf("[Notify] Response Body Error for '%s': %s", h.Name, resp.Status)
 			continue
 		}
 
 		// TODO some sort of way to determine if data is successful (keywords)
-		d.logger <- fmt.Sprintf("[Notify] Success? %#v", data)
+		d.Logger <- fmt.Sprintf("[Notify] Success? %#v", data)
 	}
 }
 
@@ -362,12 +296,3 @@ func NewHTTPClient() *http.Client {
 	}
 	return client
 }
-
-// This is so that the log messages don't trample
-// over each other when they happen simultaneously.
-func logger(msgs chan string) {
-	for {
-		msg := <-msgs
-		log.Println(msg)
-	}
-}