recipe

package
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 Go to latest Published: Feb 17, 2016 License: Apache-2.0 Imports: 12 Imported by: 0

Documentation

Overview

Copyright 2016 CoreOS, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Copyright 2016 CoreOS, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrKeyExists      = errors.New("key already exists")
	ErrWaitMismatch   = errors.New("unexpected wait result")
	ErrTooManyClients = errors.New("too many clients")
)

Functions

func NewLocker 

func NewLocker(client *clientv3.Client, key string) sync.Locker

func NewSTM 

func NewSTM(client *clientv3.Client, apply func(*STM) error) <-chan error

NewSTM creates new transaction loop for a given apply function.

func RevokeSessionLease 

func RevokeSessionLease(client *clientv3.Client) (err error)

RevokeSessionLease revokes the session lease.

func SessionLease 

func SessionLease(client *clientv3.Client) (lease.LeaseID, error)

func SessionLeaseTTL 

func SessionLeaseTTL(client *clientv3.Client, ttl int64) (lease.LeaseID, error)

func StopSessionLease 

func StopSessionLease(client *clientv3.Client)

StopSessionLease ends the refresh for the session lease. This is useful in case the state of the client connection is indeterminate (revoke would fail) or if transferring lease ownership.

func WaitEvents 

func WaitEvents(c *clientv3.Client, key string, rev int64, evs []storagepb.Event_EventType) (*storagepb.Event, error)

WaitEvents waits on a key until it observes the given events and returns the final one.

func WaitPrefixEvents 

func WaitPrefixEvents(c *clientv3.Client, prefix string, rev int64, evs []storagepb.Event_EventType) (*storagepb.Event, error)

Types

type Barrier 

type Barrier struct {
	// contains filtered or unexported fields
}

Barrier creates a key in etcd to block processes, then deletes the key to release all blocked processes.

func NewBarrier 

func NewBarrier(client *clientv3.Client, key string) *Barrier

func (*Barrier) Hold 

func (b *Barrier) Hold() error

Hold creates the barrier key causing processes to block on Wait.

func (*Barrier) Release 

func (b *Barrier) Release() error

Release deletes the barrier key to unblock all waiting processes.

func (*Barrier) Wait 

func (b *Barrier) Wait() error

Wait blocks on the barrier key until it is deleted. If there is no key, Wait assumes Release has already been called and returns immediately.

type DoubleBarrier 

type DoubleBarrier struct {
	// contains filtered or unexported fields
}

DoubleBarrier blocks processes on Enter until an expected count enters, then blocks again on Leave until all processes have left.

func NewDoubleBarrier 

func NewDoubleBarrier(client *clientv3.Client, key string, count int) *DoubleBarrier

func (*DoubleBarrier) Enter 

func (b *DoubleBarrier) Enter() error

Enter waits for "count" processes to enter the barrier then returns

func (*DoubleBarrier) Leave 

func (b *DoubleBarrier) Leave() error

Leave waits for "count" processes to leave the barrier then returns

type Election 

type Election struct {
	// contains filtered or unexported fields
}

func NewElection 

func NewElection(client *clientv3.Client, keyPrefix string) *Election

NewElection returns a new election on a given key prefix.

func (*Election) Leader 

func (e *Election) Leader() (string, error)

Leader returns the leader value for the current election.

func (*Election) Resign 

func (e *Election) Resign() (err error)

Resign lets a leader start a new election.

func (*Election) Volunteer 

func (e *Election) Volunteer(val string) error

Volunteer puts a value as eligible for the election. It blocks until it is elected or an error occurs (cannot withdraw candidacy)

func (*Election) Wait 

func (e *Election) Wait() (string, error)

Wait waits for a leader to be elected, returning the leader value.

type EphemeralKV 

type EphemeralKV struct{ RemoteKV }

EphemeralKV is a new key associated with a session lease

func NewEphemeralKV 

func NewEphemeralKV(client *clientv3.Client, key, val string) (*EphemeralKV, error)

NewEphemeralKV creates a new key/value pair associated with a session lease

func NewUniqueEphemeralKV 

func NewUniqueEphemeralKV(client *clientv3.Client, prefix, val string) (ek *EphemeralKV, err error)

NewUniqueEphemeralKV creates a new unique key/value pair associated with a session lease

func NewUniqueEphemeralKey 

func NewUniqueEphemeralKey(client *clientv3.Client, prefix string) (*EphemeralKV, error)

NewUniqueEphemeralKey creates a new unique valueless key associated with a session lease

type Mutex 

type Mutex struct {
	// contains filtered or unexported fields
}

Mutex implements the sync Locker interface with etcd

func NewMutex 

func NewMutex(client *clientv3.Client, key string) *Mutex

func (*Mutex) Lock 

func (m *Mutex) Lock() (err error)

func (*Mutex) Unlock 

func (m *Mutex) Unlock() error

type PriorityQueue 

type PriorityQueue struct {
	// contains filtered or unexported fields
}

PriorityQueue implements a multi-reader, multi-writer distributed queue.

func NewPriorityQueue 

func NewPriorityQueue(client *clientv3.Client, key string) *PriorityQueue

NewPriorityQueue creates an etcd priority queue.

func (*PriorityQueue) Dequeue 

func (q *PriorityQueue) Dequeue() (string, error)

Dequeue returns Enqueue()'d items in FIFO order. If the queue is empty, Dequeue blocks until items are available.

func (*PriorityQueue) Enqueue 

func (q *PriorityQueue) Enqueue(val string, pr uint16) error

Enqueue puts a value into a queue with a given priority.

type Queue 

type Queue struct {
	// contains filtered or unexported fields
}

Queue implements a multi-reader, multi-writer distributed queue.

func NewQueue 

func NewQueue(client *clientv3.Client, keyPrefix string) *Queue

func (*Queue) Dequeue 

func (q *Queue) Dequeue() (string, error)

Dequeue returns Enqueue()'d elements in FIFO order. If the queue is empty, Dequeue blocks until elements are available.

func (*Queue) Enqueue 

func (q *Queue) Enqueue(val string) error

type RWMutex 

type RWMutex struct {
	// contains filtered or unexported fields
}

func NewRWMutex 

func NewRWMutex(client *clientv3.Client, key string) *RWMutex

func (*RWMutex) Lock 

func (rwm *RWMutex) Lock() error

func (*RWMutex) RLock 

func (rwm *RWMutex) RLock() error

func (*RWMutex) RUnlock 

func (rwm *RWMutex) RUnlock() error

func (*RWMutex) Unlock 

func (rwm *RWMutex) Unlock() error

type Range 

type Range struct {
	// contains filtered or unexported fields
}

func NewRange 

func NewRange(client *clientv3.Client, key string) *Range

func NewRangeRev 

func NewRangeRev(client *clientv3.Client, key string, rev int64) *Range

func (*Range) FirstCreate 

func (r *Range) FirstCreate() (*pb.RangeResponse, error)

func (*Range) FirstKey 

func (r *Range) FirstKey() (*pb.RangeResponse, error)

func (*Range) FirstRev 

func (r *Range) FirstRev() (*pb.RangeResponse, error)

func (*Range) LastCreate 

func (r *Range) LastCreate() (*pb.RangeResponse, error)

func (*Range) LastKey 

func (r *Range) LastKey() (*pb.RangeResponse, error)

func (*Range) LastRev 

func (r *Range) LastRev() (*pb.RangeResponse, error)

func (*Range) OpenInterval 

func (r *Range) OpenInterval() (*pb.RangeResponse, error)

OpenInterval gets the keys in the set <key>* - <key>

func (*Range) Prefix 

func (r *Range) Prefix() (*pb.RangeResponse, error)

Prefix performs a RangeRequest to get keys matching <key>*

type RemoteKV 

type RemoteKV struct {
	// contains filtered or unexported fields
}

Key is a key/revision pair created by the client and stored on etcd

func GetRemoteKV 

func GetRemoteKV(client *clientv3.Client, key string) (*RemoteKV, error)

func NewKV 

func NewKV(client *clientv3.Client, key, val string, leaseID lease.LeaseID) (*RemoteKV, error)

func NewKey 

func NewKey(client *clientv3.Client, key string, leaseID lease.LeaseID) (*RemoteKV, error)

func NewSequentialKV 

func NewSequentialKV(client *clientv3.Client, prefix, val string) (*RemoteKV, error)

NewSequentialKV allocates a new sequential key-value pair at <prefix>/nnnnn

func NewUniqueKV 

func NewUniqueKV(client *clientv3.Client, prefix string, val string, leaseID lease.LeaseID) (*RemoteKV, error)

func NewUniqueKey 

func NewUniqueKey(client *clientv3.Client, prefix string) (*RemoteKV, error)

func (*RemoteKV) Delete 

func (rk *RemoteKV) Delete() error

func (*RemoteKV) Key 

func (rk *RemoteKV) Key() string

func (*RemoteKV) Put 

func (rk *RemoteKV) Put(val string) error

func (*RemoteKV) Revision 

func (rk *RemoteKV) Revision() int64

func (*RemoteKV) Value 

func (rk *RemoteKV) Value() string

type STM 

type STM struct {
	// contains filtered or unexported fields
}

STM implements software transactional memory over etcd

func (*STM) Abort 

func (s *STM) Abort()

Abort abandons the apply loop, letting the transaction close without a commit.

func (*STM) Get 

func (s *STM) Get(key string) (string, error)

Get returns the value for a given key, inserting the key into the txn's rset.

func (*STM) Put 

func (s *STM) Put(key string, val string)

Put adds a value for a key to the write set.

type Watcher 

type Watcher struct {
	// contains filtered or unexported fields
}

func NewPrefixWatcher 

func NewPrefixWatcher(c *clientv3.Client, prefix string, rev int64) (*Watcher, error)

func NewWatcher 

func NewWatcher(c *clientv3.Client, key string, rev int64) (*Watcher, error)

func (*Watcher) Chan 

func (w *Watcher) Chan() <-chan *storagepb.Event

func (*Watcher) Close 

func (w *Watcher) Close() error

Source Files

View all Source files

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