Documentation
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Index ¶
Constants ¶
const StreamMetadataKey = "dapr-stream"
Metadata header used to indicate if the call should be handled as a gRPC stream.
Variables ¶
This section is empty.
Functions ¶
func RegisterService ¶
func RegisterService(server *grpc.Server, director StreamDirector, getPolicyFn getPolicyFn, serviceName string, methodNames ...string)
RegisterService sets up a proxy handler for a particular gRPC service and method. The behaviour is the same as if you were registering a handler method, e.g. from a codegenerated pb.go file.
This can *only* be used if the `server` also uses grpcproxy.CodecForServer() ServerOption.
func TransparentHandler ¶
func TransparentHandler(director StreamDirector, getPolicyFn getPolicyFn, connFactory DirectorConnectionFactory, maxMessageBodySize int) grpc.StreamHandler
TransparentHandler returns a handler that attempts to proxy all requests that are not registered in the server. The indented use here is as a transparent proxy, where the server doesn't know about the services implemented by the backends. It should be used as a `grpc.UnknownServiceHandler`.
This can *only* be used if the `server` also uses grpcproxy.CodecForServer() ServerOption.
Types ¶
type DirectorConnectionFactory ¶
type DirectorConnectionFactory func(ctx context.Context, address string, id string, namespace string, customOpts ...grpc.DialOption) (*grpc.ClientConn, func(destroy bool), error)
DirectorConnectionFactory is a method signature for a gRPC connection establisher method used for client/server streams
type ProxyTarget ¶
ProxyTarget is an object that describes the network and service identification of a remote Dapr process
type StreamDirector ¶
type StreamDirector func(ctx context.Context, fullMethodName string) (context.Context, *grpc.ClientConn, *ProxyTarget, func(destroy bool), error)
StreamDirector returns a gRPC ClientConn to be used to forward the call to.
The presence of the `Context` allows for rich filtering, e.g. based on Metadata (headers). If no handling is meant to be done, a `codes.NotImplemented` gRPC error should be returned.
The context returned from this function should be the context for the *outgoing* (to backend) call. In case you want to forward any Metadata between the inbound request and outbound requests, you should do it manually. However, you *must* propagate the cancel function (`context.WithCancel`) of the inbound context to the one returned.
It is worth noting that the StreamDirector will be fired *after* all server-side stream interceptors are invoked. So decisions around authorization, monitoring etc. are better to be handled there.
See the rather rich example.
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