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Merge pull request #5 from lucab/ups/etcd3-semaphore
lock: add etcdv3 semaphore implementation
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| Original file line number | Diff line number | Diff line change |
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| gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= | ||
| gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo= | ||
| gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7 h1:+t9dhfO+GNOIGJof6kPOAenx7YgrZMTdRPV+EsnPabk= | ||
| gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74= | ||
| honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| package lock | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "net/url" | ||
|
|
||
| "go.etcd.io/etcd/clientv3" | ||
| ) | ||
|
|
||
| const ( | ||
| keyTemplate = "com.coreos.airlock/groups/%s/v1/semaphore" | ||
| defaultGroup = "default" | ||
| ) | ||
|
|
||
| var ( | ||
| // ErrNilManager is returned on nil manager | ||
| ErrNilManager = errors.New("nil Manager") | ||
| ) | ||
|
|
||
| // Manager takes care of locking for clients | ||
| type Manager struct { | ||
| client *clientv3.Client | ||
| keyPath string | ||
| } | ||
|
|
||
| // NewManager returns a new lock manager, ensuring the underlying semaphore is initialized. | ||
| func NewManager(ctx context.Context, etcdURLs []string, group string, slots uint64) (*Manager, error) { | ||
| // TODO(lucab): move to clientv3.New(clientv3.Config) | ||
| client, err := clientv3.NewFromURL(etcdURLs[0]) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| keyPath := fmt.Sprintf(keyTemplate, url.QueryEscape(group)) | ||
| manager := Manager{client, keyPath} | ||
|
|
||
| if err := manager.ensureInit(ctx, slots); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &manager, nil | ||
| } | ||
|
|
||
| // RecursiveLock adds this lock `id` as a holder of the semaphore | ||
| // | ||
| // It will return an error if there is a problem getting or setting the | ||
| // semaphore, or if the maximum number of holders has been reached. | ||
| func (m *Manager) RecursiveLock(ctx context.Context, id string) error { | ||
| sem, version, err := m.get(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| held, err := sem.RecursiveLock(id) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if held { | ||
| return nil | ||
| } | ||
|
|
||
| if err := m.set(ctx, sem, version); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // UnlockIfHeld removes this lock `id` as a holder of the semaphore | ||
| // | ||
| // It returns an error if there is a problem getting or setting the semaphore. | ||
| func (m *Manager) UnlockIfHeld(ctx context.Context, id string) error { | ||
| sem, version, err := m.get(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err := sem.UnlockIfHeld(id); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err := m.set(ctx, sem, version); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Close reaps all running goroutines | ||
| func (m *Manager) Close() { | ||
| if m == nil { | ||
| return | ||
| } | ||
|
|
||
| m.client.Close() | ||
| } | ||
|
|
||
| // ensureInit initialize the semaphore in etcd, if it does not exist yet | ||
| func (m *Manager) ensureInit(ctx context.Context, slots uint64) error { | ||
| if m == nil { | ||
| return ErrNilManager | ||
| } | ||
|
|
||
| sem := NewSemaphore(slots) | ||
| semValue, err := sem.String() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| _, err = m.client.Txn(ctx).If( | ||
| // version=0 means that the key does not exist. | ||
| clientv3.Compare(clientv3.Version(m.keyPath), "=", 0), | ||
| ).Then( | ||
| clientv3.OpPut(m.keyPath, semValue), | ||
| ).Commit() | ||
|
|
||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // get returns the current semaphore value and version, or an error | ||
| func (m *Manager) get(ctx context.Context) (*Semaphore, int64, error) { | ||
| resp, err := m.client.Get(ctx, m.keyPath) | ||
| if err != nil { | ||
| return nil, 0, err | ||
| } | ||
| if resp.Count != 1 { | ||
| return nil, 0, fmt.Errorf("unexpected number of results: %d", resp.Count) | ||
| } | ||
|
|
||
| var data []byte | ||
| var version int64 | ||
| for _, kv := range resp.Kvs { | ||
| data = kv.Value | ||
| version = kv.Version | ||
| break | ||
| } | ||
| if version == 0 { | ||
| return nil, 0, errors.New("key at version 0") | ||
| } | ||
| if len(data) == 0 { | ||
| return nil, 0, errors.New("empty semaphore value") | ||
| } | ||
|
|
||
| sem := &Semaphore{} | ||
| err = json.Unmarshal(data, sem) | ||
| if err != nil { | ||
| return nil, 0, err | ||
| } | ||
|
|
||
| return sem, version, nil | ||
| } | ||
|
|
||
| // set updates the semaphore in etcd, if `version` matches the one previously observed | ||
| func (m *Manager) set(ctx context.Context, sem *Semaphore, version int64) error { | ||
| if m == nil { | ||
| return ErrNilManager | ||
| } | ||
| if sem == nil { | ||
| return ErrNilSemaphore | ||
| } | ||
|
|
||
| data, err := json.Marshal(sem) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Conditionally Put if version in etcd is still the same we observed. | ||
| // If the condition is not met, the transaction will return as "not succeeding". | ||
| resp, err := m.client.Txn(ctx).If( | ||
| clientv3.Compare(clientv3.Version(m.keyPath), "=", version), | ||
| ).Then( | ||
| clientv3.OpPut(m.keyPath, string(data)), | ||
| ).Commit() | ||
|
|
||
| if err != nil { | ||
| return err | ||
| } | ||
| if !resp.Succeeded { | ||
| return errors.New("conflict on semaphore detected, aborting") | ||
| } | ||
|
|
||
| return nil | ||
| } |
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