coolaj86/go-watchdog
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WIP: temporary decisions for public api #1

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coolaj86 wants to merge 5 commits from cmd into master
pull from: cmd
merge into: coolaj86:master
Conversation 0 Commits 5 Files Changed 7 +109 -100
2 changed files with 109 additions and 100 deletions
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Showing only changes of commit df1ad251d1 - Show all commits

94
cmd/watchdog/watchdog.go Normal file
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@ -0,0 +1,94 @@
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
watchdog "git.rootprojects.org/root/watchdog.go"
)
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 := &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)
}
}

115
watchdog.go
View File

@ -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
@ -121,7 +45,7 @@ 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 {
@ -183,11 +107,11 @@ 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 +127,25 @@ 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 +158,7 @@ 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
}
@ -299,12 +223,12 @@ 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 +238,12 @@ 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 +286,3 @@ 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)
}
}