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[![codecov](https://codecov.io/gh/itimofeev/go-saga/branch/master/graph/badge.svg)](https://codecov.io/gh/itimofeev/go-saga)\nSaga pattern implementation in Go\n\nThis library implements Choreography-based saga pattern. This pattern used when you need to deal with distributed transaction.\nOften in microservice architecture we need to do some actions in one service, then send request to second service, then send notification via third service.\nSaga allows defining compensation functions for each step that will be automatically applied in case of error on any step.\n\nYou can read more details about this pattern here https://microservices.io/patterns/data/saga.html#example-choreography-based-saga\n\n# Installing\n```go get github.com/itimofeev/go-saga```\n\n# Getting started\n\n```\nfunc TestExample(t *testing.T) {\n    // defines new saga\n    s := NewSaga(\"saga name\")\n    \n    x := 0 // saga will change x by adding 10 than adding 100\n    require.NoError(t, s.AddStep(\u0026Step{\n        Name:           \"1\",\n        Func:           func(context.Context) error { x += 10; return nil },\n        CompensateFunc: func(context.Context) error { x -= 10; return nil },\n    }))\n    require.NoError(t, s.AddStep(\u0026Step{\n        Name:           \"2\",\n        // suppose function in second step returns error\n        Func:           func(context.Context) error { x += 100; return errors.New(\"err\") },\n        CompensateFunc: func(context.Context) error { x -= 100; return nil },\n    }))\n    \n    store := New()\n    c := NewCoordinator(context.Background(), context.Background(), s, store)\n    require.Error(t, c.Play().ExecutionError)\n    \n    // x is still 0, because saga rolled back all applied steps\n    require.Equal(t, 0, x)\n}\n```\n\n# Store\nCoordinator stores all sagas executions using `Store` interface.\n```\ntype Store interface {\n\tAppendLog(log *Log) error\n\tGetAllLogsByExecutionID(executionID string) ([]*Log, error)\n\tGetStepLogsToCompensate(executionID string) ([]*Log, error)\n}\n```\nThis library implements only in-memory store to eliminate dependencies.\nBut it's easy to implement this interface using any DB, for example PostgreSQL.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fitimofeev%2Fgo-saga","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fitimofeev%2Fgo-saga","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fitimofeev%2Fgo-saga/lists"}