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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,14 +1,12 @@ | ||
| { | ||
| "name": "Go", | ||
| "build": { | ||
| "dockerfile": "Dockerfile", | ||
| "dockerfile": "Dockerfile" | ||
| }, | ||
| "extensions": [ | ||
| "golang.go", | ||
| "hashicorp.terraform", | ||
| "zxh404.vscode-proto3" | ||
| ], | ||
| "remoteUser": "vscode", | ||
| "mounts": [ | ||
| "source=${localEnv:HOME}/.aws/,target=/home/vscode/.aws/,type=bind,consistency=cached" | ||
| ] | ||
| "postCreateCommand": "bash .devcontainer/install-dev-tools.sh" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| # compile proto | ||
| sh build/scripts/proto/compile.sh |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -136,4 +136,4 @@ issues: | |
| - goconst | ||
| - gosec | ||
| - noctx | ||
| - wrapcheck | ||
| - wrapcheck | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| #!/bin/sh | ||
| protoc --go_out=. --go_opt=paths=source_relative \ | ||
| --go-grpc_out=. --go-grpc_opt=paths=source_relative \ | ||
| proto/*/*.proto |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| # service | ||
|
|
||
| This example is a toy implementation of Substation's gRPC service and shows how it can be used for inter-process communication (IPC) to send processed data from the sink back to the source. Refer to the [gRPC quickstart guide](https://grpc.io/docs/languages/go/quickstart/#regenerate-grpc-code) for compiling the protobuf. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| local sinklib = import '../../build/config/sink.libsonnet'; | ||
|
|
||
| { | ||
| sink: sinklib.grpc(server='localhost:50051'), | ||
| transform: { | ||
| type: 'transfer' | ||
| }, | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "os" | ||
| "sync" | ||
|
|
||
| "github.com/brexhq/substation/cmd" | ||
| "github.com/brexhq/substation/config" | ||
| "github.com/brexhq/substation/internal/service" | ||
|
|
||
| "golang.org/x/sync/errgroup" | ||
| ) | ||
|
|
||
| func main() { | ||
| sub := cmd.New() | ||
|
|
||
| bytes, err := os.ReadFile("./config.json") | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| if err := json.Unmarshal(bytes, &sub.Config); err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| // maintains app state | ||
| group, ctx := errgroup.WithContext(context.TODO()) | ||
|
|
||
| // create the gRPC server | ||
| server := service.Server{} | ||
| server.Setup() | ||
|
|
||
| // deferring guarantees that the gRPC server will shutdown | ||
| defer server.Stop() | ||
|
|
||
| // create the server API for the Sink service and register it with the server | ||
| srv := &service.Sink{} | ||
| server.RegisterSink(srv) | ||
|
|
||
| // gRPC server runs in a goroutine to prevent blocking main | ||
| group.Go(func() error { | ||
| return server.Start("localhost:50051") | ||
| }) | ||
|
|
||
| // sink goroutine | ||
| var sinkWg sync.WaitGroup | ||
| sinkWg.Add(1) | ||
| group.Go(func() error { | ||
| return sub.Sink(ctx, &sinkWg) | ||
| }) | ||
|
|
||
| // transform goroutine | ||
| var transformWg sync.WaitGroup | ||
| transformWg.Add(1) | ||
| group.Go(func() error { | ||
| return sub.Transform(ctx, &transformWg) | ||
| }) | ||
|
|
||
| // ingest goroutine | ||
| group.Go(func() error { | ||
| data := [][]byte{ | ||
| []byte(`{"foo":"bar"}`), | ||
| []byte(`{"baz":"qux"}`), | ||
| []byte(`{"quux":"corge"}`), | ||
| } | ||
|
|
||
| cap := config.NewCapsule() | ||
|
|
||
| fmt.Println("sending capsules into Substation ...") | ||
| for _, d := range data { | ||
| fmt.Println(string(d)) | ||
| cap.SetData(d) | ||
| sub.Send(cap) | ||
| } | ||
|
|
||
| sub.WaitTransform(&transformWg) | ||
| sub.WaitSink(&sinkWg) | ||
|
|
||
| return nil | ||
| }) | ||
|
|
||
| // block until all Substation processing is complete | ||
| if err := sub.Block(ctx, group); err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| // block until the gRPC server has received all capsules and the stream is closed | ||
| srv.Block() | ||
|
|
||
| fmt.Println("returning capsules sent from gRPC sink ...") | ||
| for _, cap := range srv.Capsules { | ||
| fmt.Println(string(cap.Data())) | ||
| } | ||
| } |
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