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feat: Transaction requests forwarder
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package middleware | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
|
|
||
| "github.com/mwitkow/grpc-proxy/proxy" | ||
| api "github.com/tigrisdata/tigris/api/server/v1" | ||
| "github.com/tigrisdata/tigris/server/types" | ||
| "github.com/tigrisdata/tigris/util" | ||
| "google.golang.org/grpc" | ||
| "google.golang.org/protobuf/proto" | ||
| "google.golang.org/protobuf/types/known/anypb" | ||
| ) | ||
|
|
||
| var ( | ||
| UserAgent = "tigris-forwarder/" + util.Version | ||
| ) | ||
|
|
||
| type Forwarder struct { | ||
| clients sync.Map | ||
| } | ||
|
|
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| var forwarder = Forwarder{} | ||
|
|
||
| // TODO: Sweep unused connections periodically | ||
| func getClient(ctx context.Context, origin string) (*grpc.ClientConn, error) { | ||
| if c, ok := forwarder.clients.Load(origin); ok { | ||
| return c.(*grpc.ClientConn), nil | ||
| } | ||
|
|
||
| opts := []grpc.DialOption{ | ||
| grpc.FailOnNonTempDialError(true), | ||
| grpc.WithReturnConnectionError(), | ||
| grpc.WithUserAgent(UserAgent), | ||
| grpc.WithBlock(), | ||
| } | ||
|
|
||
| conn, err := grpc.DialContext(ctx, origin, opts...) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| forwarder.clients.Store(origin, conn) | ||
|
|
||
| return conn, nil | ||
| } | ||
|
|
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| func proxyDirector(ctx context.Context, _ string) (context.Context, *grpc.ClientConn, error) { | ||
| txCtx := api.GetTransaction(ctx, nil) | ||
|
|
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| client, err := getClient(ctx, txCtx.GetOrigin()) | ||
|
|
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| return ctx, client, err | ||
| } | ||
|
|
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| func forwarderStreamServerInterceptor() grpc.StreamServerInterceptor { | ||
| return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error { | ||
| txCtx := api.GetTransaction(stream.Context(), nil) | ||
|
|
||
| if txCtx != nil && txCtx.GetOrigin() != types.MyOrigin { | ||
| return proxy.TransparentHandler(proxyDirector)(srv, stream) | ||
| } | ||
|
|
||
| return handler(srv, stream) | ||
| } | ||
| } | ||
|
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||
| func forwardRequest(ctx context.Context, txCtx *api.TransactionCtx, method string, req proto.Message) (interface{}, error) { | ||
| client, err := getClient(ctx, txCtx.GetOrigin()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| resp := &anypb.Any{} | ||
| if err := client.Invoke(ctx, method, req, resp); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return resp, nil | ||
| } | ||
|
|
||
| func forwarderUnaryServerInterceptor() grpc.UnaryServerInterceptor { | ||
| return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (iface interface{}, err error) { | ||
| txCtx := api.GetTransaction(ctx, req.(proto.Message)) | ||
|
|
||
| if txCtx != nil && txCtx.GetOrigin() != types.MyOrigin { | ||
| return forwardRequest(ctx, txCtx, info.FullMethod, req.(proto.Message)) | ||
| } | ||
|
|
||
| return handler(ctx, req) | ||
| } | ||
| } |
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