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impl.go
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impl.go
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package repowatch
import (
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/Cloud-Foundations/Dominator/lib/fsutil"
"github.com/Cloud-Foundations/Dominator/lib/log"
"github.com/Cloud-Foundations/tricorder/go/tricorder"
"github.com/Cloud-Foundations/tricorder/go/tricorder/units"
)
type gitMetricsType struct {
lastAttemptedPullTime time.Time
lastCommitId string
lastSuccessfulPullTime time.Time
lastNotificationTime time.Time
latencyDistribution *tricorder.CumulativeDistribution
}
func checkDirectory(directory string) error {
if fi, err := os.Stat(directory); err != nil {
return err
} else if !fi.IsDir() {
return fmt.Errorf("not a directory: %s", directory)
}
return nil
}
func gitCommand(repositoryDirectory string, command ...string) error {
cmd := exec.Command("git", command...)
cmd.Dir = repositoryDirectory
if output, err := cmd.CombinedOutput(); err != nil {
return errors.New(err.Error() + ": " + string(output))
}
return nil
}
func gitPull(repositoryDirectory string,
metrics *gitMetricsType) (string, error) {
metrics.lastAttemptedPullTime = time.Now()
if err := gitCommand(repositoryDirectory, "pull"); err != nil {
return "", err
}
metrics.lastSuccessfulPullTime = time.Now()
metrics.latencyDistribution.Add(
metrics.lastSuccessfulPullTime.Sub(metrics.lastAttemptedPullTime))
return readLatestCommitId(repositoryDirectory)
}
func readLatestCommitId(repositoryDirectory string) (string, error) {
commitId, err := ioutil.ReadFile(
filepath.Join(repositoryDirectory, ".git/refs/heads/master"))
if err != nil {
return "", err
}
return strings.TrimSpace(string(commitId)), nil
}
func setupGitRepository(remoteURL, localDirectory, awsSecretId string,
metrics *gitMetricsType, logger log.DebugLogger) (string, error) {
if err := os.MkdirAll(localDirectory, fsutil.DirPerms); err != nil {
return "", err
}
gitSubdir := filepath.Join(localDirectory, ".git")
if _, err := os.Stat(gitSubdir); err != nil {
if !os.IsNotExist(err) {
return "", err
}
metrics.lastAttemptedPullTime = time.Now()
if err := awsGetKey(awsSecretId, logger); err != nil {
return "", err
}
err := gitCommand(localDirectory, "clone", remoteURL, ".")
if err != nil {
return "", err
}
metrics.lastSuccessfulPullTime = time.Now()
return readLatestCommitId(localDirectory)
} else {
go func() {
for {
if err := awsGetKey(awsSecretId, logger); err != nil {
logger.Println(err)
time.Sleep(time.Minute * 5)
} else {
return
}
}
}()
// Try to be as fresh as possible.
if commitId, err := gitPull(localDirectory, metrics); err != nil {
logger.Println(err)
return readLatestCommitId(localDirectory)
} else {
return commitId, nil
}
}
}
func watch(config Config, metricDirectory string,
logger log.DebugLogger) (<-chan string, error) {
if config.Branch != "" && config.Branch != "master" {
return nil, errors.New("non-master branch not supported")
}
if config.CheckInterval < time.Second {
config.CheckInterval = time.Second
}
if config.RepositoryURL == "" {
return watchLocal(config.LocalRepositoryDirectory, config.CheckInterval,
metricDirectory, logger)
}
return watchGit(config.RepositoryURL, config.LocalRepositoryDirectory,
config.AwsSecretId, config.CheckInterval, metricDirectory, logger)
}
func watchGit(remoteURL, localDirectory, awsSecretId string,
checkInterval time.Duration, metricDirectory string,
logger log.DebugLogger) (<-chan string, error) {
notificationChannel := make(chan string, 1)
metrics := &gitMetricsType{
latencyDistribution: tricorder.NewGeometricBucketer(1, 1e5).
NewCumulativeDistribution(),
}
err := tricorder.RegisterMetric(filepath.Join(metricDirectory,
"git-pull-latency"), metrics.latencyDistribution,
units.Millisecond, "latency of git pull calls")
if err != nil {
return nil, err
}
metrics.lastCommitId, err = setupGitRepository(remoteURL, localDirectory,
awsSecretId, metrics, logger)
if err != nil {
return nil, err
}
err = tricorder.RegisterMetric(filepath.Join(metricDirectory,
"last-attempted-git-pull-time"), &metrics.lastAttemptedPullTime,
units.None, "time of last attempted git pull")
if err != nil {
return nil, err
}
err = tricorder.RegisterMetric(filepath.Join(metricDirectory,
"last-commit-id"), &metrics.lastCommitId,
units.None, "commit ID in master branch in last successful git pull")
if err != nil {
return nil, err
}
err = tricorder.RegisterMetric(filepath.Join(metricDirectory,
"last-successful-git-pull-time"), &metrics.lastSuccessfulPullTime,
units.None, "time of last successful git pull")
if err != nil {
return nil, err
}
err = tricorder.RegisterMetric(filepath.Join(metricDirectory,
"last-notification-time"), &metrics.lastNotificationTime, units.None,
"time of last git change notification")
if err != nil {
return nil, err
}
metrics.lastNotificationTime = time.Now()
notificationChannel <- localDirectory
go watchGitLoop(localDirectory, checkInterval, metrics, notificationChannel,
logger)
return notificationChannel, nil
}
func watchGitLoop(directory string, checkInterval time.Duration,
metrics *gitMetricsType, notificationChannel chan<- string,
logger log.DebugLogger) {
for {
time.Sleep(checkInterval)
if commitId, err := gitPull(directory, metrics); err != nil {
logger.Println(err)
} else if commitId != metrics.lastCommitId {
metrics.lastCommitId = commitId
metrics.lastNotificationTime = time.Now()
notificationChannel <- directory
}
}
}
func watchLocal(directory string, checkInterval time.Duration,
metricDirectory string, logger log.DebugLogger) (<-chan string, error) {
if err := checkDirectory(directory); err != nil {
return nil, err
}
var lastNotificationTime time.Time
err := tricorder.RegisterMetric(filepath.Join(metricDirectory,
"last-notification-time"), &lastNotificationTime, units.None,
"time of last notification")
if err != nil {
return nil, err
}
notificationChannel := make(chan string, 1)
go watchLocalLoop(directory, checkInterval, &lastNotificationTime,
notificationChannel, logger)
return notificationChannel, nil
}
func watchLocalLoop(directory string, checkInterval time.Duration,
lastNotificationTime *time.Time, notificationChannel chan<- string,
logger log.DebugLogger) {
for ; ; time.Sleep(checkInterval) {
if err := checkDirectory(directory); err != nil {
logger.Println(err)
} else {
*lastNotificationTime = time.Now()
notificationChannel <- directory
}
}
}