/
etcd_lock_provider.go
299 lines (254 loc) · 7.01 KB
/
etcd_lock_provider.go
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package etcd
import (
"context"
"crypto/tls"
"path"
"strconv"
"strings"
"time"
etcd "github.com/coreos/etcd/clientv3"
etcdsync "github.com/coreos/etcd/clientv3/concurrency"
log "github.com/sirupsen/logrus"
"github.com/akutz/gosync"
csictx "github.com/rexray/gocsi/context"
mwtypes "github.com/rexray/gocsi/middleware/serialvolume/types"
)
// New returns a new etcd volume lock provider.
func New(
ctx context.Context,
domain string,
ttl time.Duration,
config *etcd.Config) (mwtypes.VolumeLockerProvider, error) {
fields := map[string]interface{}{}
if domain == "" {
domain = csictx.Getenv(ctx, EnvVarDomain)
}
domain = path.Join("/", domain)
fields["serialvol.etcd.domain"] = domain
if ttl == 0 {
ttl, _ = time.ParseDuration(csictx.Getenv(ctx, EnvVarTTL))
if ttl > 0 {
fields["serialvol.etcd.ttl"] = ttl
}
}
if config == nil {
cfg, err := initConfig(ctx, fields)
if err != nil {
return nil, err
}
config = &cfg
}
log.WithFields(fields).Info("creating serial vol etcd lock provider")
client, err := etcd.New(*config)
if err != nil {
return nil, err
}
return &provider{
client: client,
domain: domain,
ttl: int(ttl.Seconds()),
}, nil
}
func initConfig(
ctx context.Context,
fields map[string]interface{}) (etcd.Config, error) {
config := etcd.Config{}
if v := csictx.Getenv(ctx, EnvVarEndpoints); v != "" {
config.Endpoints = strings.Split(v, ",")
fields["serialvol.etcd.Endpoints"] = v
}
if v := csictx.Getenv(ctx, EnvVarAutoSyncInterval); v != "" {
v, err := time.ParseDuration(v)
if err != nil {
return config, err
}
config.AutoSyncInterval = v
fields["serialvol.etcd.AutoSyncInterval"] = v
}
if v := csictx.Getenv(ctx, EnvVarDialKeepAliveTime); v != "" {
v, err := time.ParseDuration(v)
if err != nil {
return config, err
}
config.DialKeepAliveTime = v
fields["serialvol.etcd.DialKeepAliveTime"] = v
}
if v := csictx.Getenv(ctx, EnvVarDialKeepAliveTimeout); v != "" {
v, err := time.ParseDuration(v)
if err != nil {
return config, err
}
config.DialKeepAliveTimeout = v
fields["serialvol.etcd.DialKeepAliveTimeout"] = v
}
if v := csictx.Getenv(ctx, EnvVarDialTimeout); v != "" {
v, err := time.ParseDuration(v)
if err != nil {
return config, err
}
config.DialTimeout = v
fields["serialvol.etcd.DialTimeout"] = v
}
if v := csictx.Getenv(ctx, EnvVarMaxCallRecvMsgSz); v != "" {
i, err := strconv.Atoi(v)
if err != nil {
return config, err
}
config.MaxCallRecvMsgSize = i
fields["serialvol.etcd.MaxCallRecvMsgSize"] = i
}
if v := csictx.Getenv(ctx, EnvVarMaxCallSendMsgSz); v != "" {
i, err := strconv.Atoi(v)
if err != nil {
return config, err
}
config.MaxCallSendMsgSize = i
fields["serialvol.etcd.MaxCallSendMsgSize"] = i
}
if v := csictx.Getenv(ctx, EnvVarUsername); v != "" {
config.Username = v
fields["serialvol.etcd.Username"] = v
}
if v := csictx.Getenv(ctx, EnvVarPassword); v != "" {
config.Password = v
fields["serialvol.etcd.Password"] = "********"
}
if v, ok := csictx.LookupEnv(ctx, EnvVarRejectOldCluster); ok {
b, err := strconv.ParseBool(v)
if err != nil {
return config, err
}
config.RejectOldCluster = b
fields["serialvol.etcd.RejectOldCluster"] = b
}
if v, ok := csictx.LookupEnv(ctx, EnvVarTLS); ok {
b, err := strconv.ParseBool(v)
if err != nil {
return config, err
}
if b {
config.TLS = &tls.Config{}
fields["serialvol.etcd.tls"] = b
if v, ok := csictx.LookupEnv(ctx, EnvVarTLSInsecure); ok {
b, err := strconv.ParseBool(v)
if err != nil {
return config, err
}
config.TLS.InsecureSkipVerify = b
fields["serialvol.etcd.tls.insecure"] = b
}
}
}
return config, nil
}
type provider struct {
client *etcd.Client
domain string
ttl int
}
func (p *provider) Close() error {
return p.client.Close()
}
func (p *provider) GetLockWithID(
ctx context.Context, id string) (gosync.TryLocker, error) {
return p.getLock(ctx, path.Join(p.domain, "volumesByID", id))
}
func (p *provider) GetLockWithName(
ctx context.Context, name string) (gosync.TryLocker, error) {
return p.getLock(ctx, path.Join(p.domain, "volumesByName", name))
}
func (p *provider) getLock(
ctx context.Context, pfx string) (gosync.TryLocker, error) {
log.Debugf("EtcdVolumeLockProvider: getLock: pfx=%v", pfx)
opts := []etcdsync.SessionOption{etcdsync.WithContext(ctx)}
if p.ttl > 0 {
opts = append(opts, etcdsync.WithTTL(p.ttl))
}
sess, err := etcdsync.NewSession(p.client, opts...)
if err != nil {
return nil, err
}
return &TryMutex{
ctx: ctx, sess: sess, mtx: etcdsync.NewMutex(sess, pfx)}, nil
}
// TryMutex is a mutual exclusion lock backed by etcd that implements the
// TryLocker interface.
// The zero value for a TryMutex is an unlocked mutex.
//
// A TryMutex may be copied after first use.
type TryMutex struct {
ctx context.Context
sess *etcdsync.Session
mtx *etcdsync.Mutex
// LockCtx, when non-nil, is the context used with Lock.
LockCtx context.Context
// UnlockCtx, when non-nil, is the context used with Unlock.
UnlockCtx context.Context
// TryLockCtx, when non-nil, is the context used with TryLock.
TryLockCtx context.Context
}
// Lock locks m. If the lock is already in use, the calling goroutine blocks
// until the mutex is available.
func (m *TryMutex) Lock() {
//log.Debug("TryMutex: lock")
ctx := m.LockCtx
if ctx == nil {
ctx = m.ctx
}
if err := m.mtx.Lock(ctx); err != nil {
log.Debugf("TryMutex: lock err: %v", err)
if err != context.Canceled && err != context.DeadlineExceeded {
log.Panicf("TryMutex: lock panic: %v", err)
}
}
}
// Unlock unlocks m. It is a run-time error if m is not locked on entry to
// Unlock.
//
// A locked TryMutex is not associated with a particular goroutine. It is
// allowed for one goroutine to lock a Mutex and then arrange for another
// goroutine to unlock it.
func (m *TryMutex) Unlock() {
//log.Debug("TryMutex: unlock")
ctx := m.UnlockCtx
if ctx == nil {
ctx = m.ctx
}
if err := m.mtx.Unlock(ctx); err != nil {
log.Debugf("TryMutex: unlock err: %v", err)
if err != context.Canceled && err != context.DeadlineExceeded {
log.Panicf("TryMutex: unlock panic: %v", err)
}
}
}
// Close closes and cleans up the underlying concurrency session.
func (m *TryMutex) Close() error {
//log.Debug("TryMutex: close")
if err := m.sess.Close(); err != nil {
log.Errorf("TryMutex: close err: %v", err)
return err
}
return nil
}
// TryLock attempts to lock m. If no lock can be obtained in the specified
// duration then a false value is returned.
func (m *TryMutex) TryLock(timeout time.Duration) bool {
ctx := m.TryLockCtx
if ctx == nil {
ctx = m.ctx
}
// Create a timeout context only if the timeout is greater than zero.
if timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, timeout)
defer cancel()
}
if err := m.mtx.Lock(ctx); err != nil {
log.Debugf("TryMutex: TryLock err: %v", err)
if err != context.Canceled && err != context.DeadlineExceeded {
log.Panicf("TryMutex: TryLock panic: %v", err)
}
return false
}
return true
}