skvoch/go-etcd-lock

Go library to run locks over etcd.

etcd-lock v5.0.5

Import

# Master via standard import
go get github.com/Scalingo/go-etcd-lock

# Last stable is v0 via gopkg.in
go get gopkg.in/Scalingo/go-etcd-lock.v3vendor/github.com/Scalingo/go-etcd-lock/lock/lock

Example

l, err := lock.Acquire(client, "/name", 60)
if lockErr, ok := err.(*lock.Error); ok {
  // Key already locked
  fmt.Println(lockErr)
  return
} else if err != nil {
  // Communication with etcd has failed or other error
  panic(err)
}

// It's ok, lock is granted for 60 secondes

// When the opration is done we release the lock
err = l.Release()
if err != nil {
  // Something wrong can happen during release: connection problem with etcd
  panic(err)
}

Testing

You need a etcd instance running on localhost:2379, then:

go test ./...

Generate mock

From the /lock/ folder:

mockgen -destination lockmock/gomock_locker.go -package lockmock github.com/Scalingo/go-etcd-lock/lock Locker
mockgen -destination lockmock/gomock_lock.go -package lockmock github.com/Scalingo/go-etcd-lock/lock Lock

Release a New Version

Bump new version number in CHANGELOG.md and README.md.

Commit, tag and create a new release:

git add CHANGELOG.md README.md
git commit -m "Bump v5.0.5"
git tag v5.0.5
git push origin master
git push --tags
hub release create v5.0.5

The title of the release should be the version number and the text of the release is the same as the changelog.