mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-12-28 04:50:56 +00:00
87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
|
/*
|
||
|
|
Copyright 2015 github.com/ucirello
|
||
|
|
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
// Package dynamolock provides a simple utility for using DynamoDB's consistent
|
||
|
|
// read/write feature to use it for managing distributed locks.
|
||
|
|
//
|
||
|
|
// In order to use this package, the client must create a table in DynamoDB,
|
||
|
|
// although the client provides a convenience method for creating that table
|
||
|
|
// (CreateTable).
|
||
|
|
//
|
||
|
|
// Basic usage:
|
||
|
|
//
|
||
|
|
// import (
|
||
|
|
// "log"
|
||
|
|
//
|
||
|
|
// "cirello.io/dynamolock"
|
||
|
|
// "github.com/aws/aws-sdk-go/aws"
|
||
|
|
// "github.com/aws/aws-sdk-go/aws/session"
|
||
|
|
// "github.com/aws/aws-sdk-go/service/dynamodb"
|
||
|
|
// )
|
||
|
|
//
|
||
|
|
// // ---
|
||
|
|
//
|
||
|
|
// svc := dynamodb.New(session.Must(session.NewSession(&aws.Config{
|
||
|
|
// Region: aws.String("us-west-2"),
|
||
|
|
// })))
|
||
|
|
// c, err := dynamolock.New(svc,
|
||
|
|
// "locks",
|
||
|
|
// dynamolock.WithLeaseDuration(3*time.Second),
|
||
|
|
// dynamolock.WithHeartbeatPeriod(1*time.Second),
|
||
|
|
// )
|
||
|
|
// if err != nil {
|
||
|
|
// log.Fatal(err)
|
||
|
|
// }
|
||
|
|
// defer c.Close()
|
||
|
|
//
|
||
|
|
// log.Println("ensuring table exists")
|
||
|
|
// c.CreateTable("locks",
|
||
|
|
// dynamolock.WithProvisionedThroughput(&dynamodb.ProvisionedThroughput{
|
||
|
|
// ReadCapacityUnits: aws.Int64(5),
|
||
|
|
// WriteCapacityUnits: aws.Int64(5),
|
||
|
|
// }),
|
||
|
|
// dynamolock.WithCustomPartitionKeyName("key"),
|
||
|
|
// )
|
||
|
|
//
|
||
|
|
// data := []byte("some content a")
|
||
|
|
// lockedItem, err := c.AcquireLock("spock",
|
||
|
|
// dynamolock.WithData(data),
|
||
|
|
// dynamolock.ReplaceData(),
|
||
|
|
// )
|
||
|
|
// if err != nil {
|
||
|
|
// log.Fatal(err)
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// log.Println("lock content:", string(lockedItem.Data()))
|
||
|
|
// if got := string(lockedItem.Data()); string(data) != got {
|
||
|
|
// log.Println("losing information inside lock storage, wanted:", string(data), " got:", got)
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// log.Println("cleaning lock")
|
||
|
|
// success, err := c.ReleaseLock(lockedItem)
|
||
|
|
// if !success {
|
||
|
|
// log.Fatal("lost lock before release")
|
||
|
|
// }
|
||
|
|
// if err != nil {
|
||
|
|
// log.Fatal("error releasing lock:", err)
|
||
|
|
// }
|
||
|
|
// log.Println("done")
|
||
|
|
//
|
||
|
|
// This package is covered by this SLA:
|
||
|
|
// https://github.com/cirello-io/public/blob/master/SLA.md
|
||
|
|
//
|
||
|
|
package dynamolock // import "cirello.io/dynamolock"
|