grpc

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 Go to latest Published: Dec 13, 2017 License: Apache-2.0 Imports: 45 Imported by: 0

README

gRPC-Go

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The Go implementation of gRPC: A high performance, open source, general RPC framework that puts mobile and HTTP/2 first. For more information see the gRPC Quick Start: Go guide.

Installation

To install this package, you need to install Go and setup your Go workspace on your computer. The simplest way to install the library is to run:

$ go get -u google.golang.org/grpc

Prerequisites

This requires Go 1.6 or later. Go 1.7 will be required as of the next gRPC-Go release (1.8).

Constraints

The grpc package should only depend on standard Go packages and a small number of exceptions. If your contribution introduces new dependencies which are NOT in the list, you need a discussion with gRPC-Go authors and consultants.

Documentation

See API documentation for package and API descriptions and find examples in the examples directory.

Performance

See the current benchmarks for some of the languages supported in this dashboard.

Status

General Availability Google Cloud Platform Launch Stages.

FAQ

Compiling error, undefined: grpc.SupportPackageIsVersion

Please update proto package, gRPC package and rebuild the proto files:

  • go get -u github.com/golang/protobuf/{proto,protoc-gen-go}
  • go get -u google.golang.org/grpc
  • protoc --go_out=plugins=grpc:. *.proto

Documentation

Overview

Package grpc implements an RPC system called gRPC.

See grpc.io for more information about gRPC.

Index

Constants

View Source 
const (
	SupportPackageIsVersion3 = true
	SupportPackageIsVersion4 = true
	SupportPackageIsVersion5 = true
)

The SupportPackageIsVersion variables are referenced from generated protocol buffer files to ensure compatibility with the gRPC version used. The latest support package version is 5.

Older versions are kept for compatibility. They may be removed if compatibility cannot be maintained.

These constants should not be referenced from any other code.

View Source 
const Version = "1.8.2"

Version is the current grpc version.

Variables

View Source 
var (
	// ErrClientConnClosing indicates that the operation is illegal because
	// the ClientConn is closing.
	ErrClientConnClosing = errors.New("grpc: the client connection is closing")
	// ErrClientConnTimeout indicates that the ClientConn cannot establish the
	// underlying connections within the specified timeout.
	// DEPRECATED: Please use context.DeadlineExceeded instead.
	ErrClientConnTimeout = errors.New("grpc: timed out when dialing")
)
View Source 
var DefaultBackoffConfig = BackoffConfig{
	MaxDelay: 120 * time.Second,
	// contains filtered or unexported fields
}

DefaultBackoffConfig uses values specified for backoff in https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.

View Source 
var EnableTracing bool

EnableTracing controls whether to trace RPCs using the golang.org/x/net/trace package. This should only be set before any RPCs are sent or received by this program.

View Source 
var ErrServerStopped = errors.New("grpc: the server has been stopped")

ErrServerStopped indicates that the operation is now illegal because of the server being stopped.

Functions

func Code 

func Code(err error) codes.Code

Code returns the error code for err if it was produced by the rpc system. Otherwise, it returns codes.Unknown.

Deprecated; use status.FromError and Code method instead.

func ErrorDesc 

func ErrorDesc(err error) string

ErrorDesc returns the error description of err if it was produced by the rpc system. Otherwise, it returns err.Error() or empty string when err is nil.

Deprecated; use status.FromError and Message method instead.

func Errorf 

func Errorf(c codes.Code, format string, a ...interface{}) error

Errorf returns an error containing an error code and a description; Errorf returns nil if c is OK.

Deprecated; use status.Errorf instead.

func Invoke 

func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) error

Invoke sends the RPC request on the wire and returns after response is received. This is typically called by generated code.

DEPRECATED: Use ClientConn.Invoke instead.

func MethodFromServerStream added in v1.8.0 

func MethodFromServerStream(stream ServerStream) (string, bool)

MethodFromServerStream returns the method string for the input stream. The returned string is in the format of "/service/method".

func SendHeader 

func SendHeader(ctx context.Context, md metadata.MD) error

SendHeader sends header metadata. It may be called at most once. The provided md and headers set by SetHeader() will be sent.

func SetHeader added in v1.0.3 

func SetHeader(ctx context.Context, md metadata.MD) error

SetHeader sets the header metadata. When called multiple times, all the provided metadata will be merged. All the metadata will be sent out when one of the following happens:

  • grpc.SendHeader() is called;
  • The first response is sent out;
  • An RPC status is sent out (error or success).

func SetTrailer 

func SetTrailer(ctx context.Context, md metadata.MD) error

SetTrailer sets the trailer metadata that will be sent when an RPC returns. When called more than once, all the provided metadata will be merged.

Types

type Address 

type Address struct {
	// Addr is the server address on which a connection will be established.
	Addr string
	// Metadata is the information associated with Addr, which may be used
	// to make load balancing decision.
	Metadata interface{}
}

Address represents a server the client connects to. This is the EXPERIMENTAL API and may be changed or extended in the future.

type BackoffConfig 

type BackoffConfig struct {
	// MaxDelay is the upper bound of backoff delay.
	MaxDelay time.Duration
	// contains filtered or unexported fields
}

BackoffConfig defines the parameters for the default gRPC backoff strategy.

type Balancer 

type Balancer interface {
	// Start does the initialization work to bootstrap a Balancer. For example,
	// this function may start the name resolution and watch the updates. It will
	// be called when dialing.
	Start(target string, config BalancerConfig) error
	// Up informs the Balancer that gRPC has a connection to the server at
	// addr. It returns down which is called once the connection to addr gets
	// lost or closed.
	// TODO: It is not clear how to construct and take advantage of the meaningful error
	// parameter for down. Need realistic demands to guide.
	Up(addr Address) (down func(error))
	// Get gets the address of a server for the RPC corresponding to ctx.
	// i) If it returns a connected address, gRPC internals issues the RPC on the
	// connection to this address;
	// ii) If it returns an address on which the connection is under construction
	// (initiated by Notify(...)) but not connected, gRPC internals
	//  * fails RPC if the RPC is fail-fast and connection is in the TransientFailure or
	//  Shutdown state;
	//  or
	//  * issues RPC on the connection otherwise.
	// iii) If it returns an address on which the connection does not exist, gRPC
	// internals treats it as an error and will fail the corresponding RPC.
	//
	// Therefore, the following is the recommended rule when writing a custom Balancer.
	// If opts.BlockingWait is true, it should return a connected address or
	// block if there is no connected address. It should respect the timeout or
	// cancellation of ctx when blocking. If opts.BlockingWait is false (for fail-fast
	// RPCs), it should return an address it has notified via Notify(...) immediately
	// instead of blocking.
	//
	// The function returns put which is called once the rpc has completed or failed.
	// put can collect and report RPC stats to a remote load balancer.
	//
	// This function should only return the errors Balancer cannot recover by itself.
	// gRPC internals will fail the RPC if an error is returned.
	Get(ctx context.Context, opts BalancerGetOptions) (addr Address, put func(), err error)
	// Notify returns a channel that is used by gRPC internals to watch the addresses
	// gRPC needs to connect. The addresses might be from a name resolver or remote
	// load balancer. gRPC internals will compare it with the existing connected
	// addresses. If the address Balancer notified is not in the existing connected
	// addresses, gRPC starts to connect the address. If an address in the existing
	// connected addresses is not in the notification list, the corresponding connection
	// is shutdown gracefully. Otherwise, there are no operations to take. Note that
	// the Address slice must be the full list of the Addresses which should be connected.
	// It is NOT delta.
	Notify() <-chan []Address
	// Close shuts down the balancer.
	Close() error
}

Balancer chooses network addresses for RPCs. This is the EXPERIMENTAL API and may be changed or extended in the future.

func NewGRPCLBBalancer added in v1.3.0 

func NewGRPCLBBalancer(r naming.Resolver) Balancer

NewGRPCLBBalancer creates a grpclb load balancer.

func RoundRobin 

func RoundRobin(r naming.Resolver) Balancer

RoundRobin returns a Balancer that selects addresses round-robin. It uses r to watch the name resolution updates and updates the addresses available correspondingly.

type BalancerConfig added in v1.0.2 

type BalancerConfig struct {
	// DialCreds is the transport credential the Balancer implementation can
	// use to dial to a remote load balancer server. The Balancer implementations
	// can ignore this if it does not need to talk to another party securely.
	DialCreds credentials.TransportCredentials
	// Dialer is the custom dialer the Balancer implementation can use to dial
	// to a remote load balancer server. The Balancer implementations
	// can ignore this if it doesn't need to talk to remote balancer.
	Dialer func(context.Context, string) (net.Conn, error)
}

BalancerConfig specifies the configurations for Balancer.

type BalancerGetOptions 

type BalancerGetOptions struct {
	// BlockingWait specifies whether Get should block when there is no
	// connected address.
	BlockingWait bool
}

BalancerGetOptions configures a Get call. This is the EXPERIMENTAL API and may be changed or extended in the future.

type CallOption 

type CallOption interface {
	// contains filtered or unexported methods
}

CallOption configures a Call before it starts or extracts information from a Call after it completes.

func FailFast 

func FailFast(failFast bool) CallOption

FailFast configures the action to take when an RPC is attempted on broken connections or unreachable servers. If failFast is true, the RPC will fail immediately. Otherwise, the RPC client will block the call until a connection is available (or the call is canceled or times out) and will retry the call if it fails due to a transient error. gRPC will not retry if data was written to the wire unless the server indicates it did not process the data. Please refer to https://github.com/grpc/grpc/blob/master/doc/wait-for-ready.md.

By default, RPCs are "Fail Fast". 

func Header(md *metadata.MD) CallOption

Header returns a CallOptions that retrieves the header metadata for a unary RPC.

func MaxCallRecvMsgSize added in v1.4.0 

func MaxCallRecvMsgSize(s int) CallOption

MaxCallRecvMsgSize returns a CallOption which sets the maximum message size the client can receive.

func MaxCallSendMsgSize added in v1.4.0 

func MaxCallSendMsgSize(s int) CallOption

MaxCallSendMsgSize returns a CallOption which sets the maximum message size the client can send.

func Peer added in v1.2.0 

func Peer(peer *peer.Peer) CallOption

Peer returns a CallOption that retrieves peer information for a unary RPC.

func PerRPCCredentials added in v1.4.0 

func PerRPCCredentials(creds credentials.PerRPCCredentials) CallOption

PerRPCCredentials returns a CallOption that sets credentials.PerRPCCredentials for a call.

func Trailer 

func Trailer(md *metadata.MD) CallOption

Trailer returns a CallOptions that retrieves the trailer metadata for a unary RPC.

func UseCompressor added in v1.8.0 

func UseCompressor(name string) CallOption

UseCompressor returns a CallOption which sets the compressor used when sending the request. If WithCompressor is also set, UseCompressor has higher priority.

This API is EXPERIMENTAL.

type ClientConn 

type ClientConn struct {
	// contains filtered or unexported fields
}

ClientConn represents a client connection to an RPC server.

func Dial 

func Dial(target string, opts ...DialOption) (*ClientConn, error)

Dial creates a client connection to the given target.

func DialContext added in v1.0.2 

func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error)

DialContext creates a client connection to the given target. ctx can be used to cancel or expire the pending connection. Once this function returns, the cancellation and expiration of ctx will be noop. Users should call ClientConn.Close to terminate all the pending operations after this function returns.

func (*ClientConn) Close 

func (cc *ClientConn) Close() error

Close tears down the ClientConn and all underlying connections.

func (*ClientConn) GetMethodConfig added in v1.4.0 

func (cc *ClientConn) GetMethodConfig(method string) MethodConfig

GetMethodConfig gets the method config of the input method. If there's an exact match for input method (i.e. /service/method), we return the corresponding MethodConfig. If there isn't an exact match for the input method, we look for the default config under the service (i.e /service/). If there is a default MethodConfig for the serivce, we return it. Otherwise, we return an empty MethodConfig.

func (*ClientConn) GetState added in v1.5.2 

func (cc *ClientConn) GetState() connectivity.State

GetState returns the connectivity.State of ClientConn. This is an EXPERIMENTAL API.

func (*ClientConn) Invoke added in v1.8.0 

func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply interface{}, opts ...CallOption) error

Invoke sends the RPC request on the wire and returns after response is received. This is typically called by generated code.

func (*ClientConn) NewStream added in v1.8.0 

func (cc *ClientConn) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error)

NewStream creates a new Stream for the client side. This is typically called by generated code.

func (*ClientConn) WaitForStateChange added in v1.5.2 

func (cc *ClientConn) WaitForStateChange(ctx context.Context, sourceState connectivity.State) bool

WaitForStateChange waits until the connectivity.State of ClientConn changes from sourceState or ctx expires. A true value is returned in former case and false in latter. This is an EXPERIMENTAL API.

type ClientStream 

type ClientStream interface {
	// Header returns the header metadata received from the server if there
	// is any. It blocks if the metadata is not ready to read.
	Header() (metadata.MD, error)
	// Trailer returns the trailer metadata from the server, if there is any.
	// It must only be called after stream.CloseAndRecv has returned, or
	// stream.Recv has returned a non-nil error (including io.EOF).
	Trailer() metadata.MD
	// CloseSend closes the send direction of the stream. It closes the stream
	// when non-nil error is met.
	CloseSend() error
	// Stream.SendMsg() may return a non-nil error when something wrong happens sending
	// the request. The returned error indicates the status of this sending, not the final
	// status of the RPC.
	// Always call Stream.RecvMsg() to get the final status if you care about the status of
	// the RPC.
	Stream
}

ClientStream defines the interface a client stream has to satisfy.

func NewClientStream 

func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error)

NewClientStream creates a new Stream for the client side. This is typically called by generated code.

DEPRECATED: Use ClientConn.NewStream instead.

type Codec 

type Codec interface {
	// Marshal returns the wire format of v.
	Marshal(v interface{}) ([]byte, error)
	// Unmarshal parses the wire format into v.
	Unmarshal(data []byte, v interface{}) error
	// String returns the name of the Codec implementation. The returned
	// string will be used as part of content type in transmission.
	String() string
}

Codec defines the interface gRPC uses to encode and decode messages. Note that implementations of this interface must be thread safe; a Codec's methods can be called from concurrent goroutines.

type Compressor 

type Compressor interface {
	// Do compresses p into w.
	Do(w io.Writer, p []byte) error
	// Type returns the compression algorithm the Compressor uses.
	Type() string
}

Compressor defines the interface gRPC uses to compress a message.

func NewGZIPCompressor 

func NewGZIPCompressor() Compressor

NewGZIPCompressor creates a Compressor based on GZIP.

type Decompressor 

type Decompressor interface {
	// Do reads the data from r and uncompress them.
	Do(r io.Reader) ([]byte, error)
	// Type returns the compression algorithm the Decompressor uses.
	Type() string
}

Decompressor defines the interface gRPC uses to decompress a message.

func NewGZIPDecompressor 

func NewGZIPDecompressor() Decompressor

NewGZIPDecompressor creates a Decompressor based on GZIP.

type DialOption 

type DialOption func(*dialOptions)

DialOption configures how we set up the connection.

func FailOnNonTempDialError added in v1.0.5 

func FailOnNonTempDialError(f bool) DialOption

FailOnNonTempDialError returns a DialOption that specifies if gRPC fails on non-temporary dial errors. If f is true, and dialer returns a non-temporary error, gRPC will fail the connection to the network address and won't try to reconnect. The default value of FailOnNonTempDialError is false. This is an EXPERIMENTAL API.

func WithAuthority added in v1.2.0 

func WithAuthority(a string) DialOption

WithAuthority returns a DialOption that specifies the value to be used as the :authority pseudo-header. This value only works with WithInsecure and has no effect if TransportCredentials are present.

func WithBackoffConfig 

func WithBackoffConfig(b BackoffConfig) DialOption

WithBackoffConfig configures the dialer to use the provided backoff parameters after connection failures.

Use WithBackoffMaxDelay until more parameters on BackoffConfig are opened up for use.

func WithBackoffMaxDelay 

func WithBackoffMaxDelay(md time.Duration) DialOption

WithBackoffMaxDelay configures the dialer to use the provided maximum delay when backing off after failed connection attempts.

func WithBalancer 

func WithBalancer(b Balancer) DialOption

WithBalancer returns a DialOption which sets a load balancer with the v1 API. Name resolver will be ignored if this DialOption is specified. Deprecated: use the new balancer APIs in balancer package instead.

func WithBalancerBuilder added in v1.7.0 

func WithBalancerBuilder(b balancer.Builder) DialOption

WithBalancerBuilder is for testing only. Users using custom balancers should register their balancer and use service config to choose the balancer to use.

func WithBlock 

func WithBlock() DialOption

WithBlock returns a DialOption which makes caller of Dial blocks until the underlying connection is up. Without this, Dial returns immediately and connecting the server happens in background.

func WithCodec 

func WithCodec(c Codec) DialOption

WithCodec returns a DialOption which sets a codec for message marshaling and unmarshaling.

func WithCompressor deprecated 

func WithCompressor(cp Compressor) DialOption

WithCompressor returns a DialOption which sets a Compressor to use for message compression. It has lower priority than the compressor set by the UseCompressor CallOption.

Deprecated: use UseCompressor instead.

func WithDecompressor deprecated 

func WithDecompressor(dc Decompressor) DialOption

WithDecompressor returns a DialOption which sets a Decompressor to use for incoming message decompression. If incoming response messages are encoded using the decompressor's Type(), it will be used. Otherwise, the message encoding will be used to look up the compressor registered via encoding.RegisterCompressor, which will then be used to decompress the message. If no compressor is registered for the encoding, an Unimplemented status error will be returned.

Deprecated: use encoding.RegisterCompressor instead.

func WithDefaultCallOptions added in v1.4.0 

func WithDefaultCallOptions(cos ...CallOption) DialOption

WithDefaultCallOptions returns a DialOption which sets the default CallOptions for calls over the connection.

func WithDialer 

func WithDialer(f func(string, time.Duration) (net.Conn, error)) DialOption

WithDialer returns a DialOption that specifies a function to use for dialing network addresses. If FailOnNonTempDialError() is set to true, and an error is returned by f, gRPC checks the error's Temporary() method to decide if it should try to reconnect to the network address.

func WithInitialConnWindowSize added in v1.4.0 

func WithInitialConnWindowSize(s int32) DialOption

WithInitialConnWindowSize returns a DialOption which sets the value for initial window size on a connection. The lower bound for window size is 64K and any value smaller than that will be ignored.

func WithInitialWindowSize added in v1.4.0 

func WithInitialWindowSize(s int32) DialOption

WithInitialWindowSize returns a DialOption which sets the value for initial window size on a stream. The lower bound for window size is 64K and any value smaller than that will be ignored.

func WithInsecure 

func WithInsecure() DialOption

WithInsecure returns a DialOption which disables transport security for this ClientConn. Note that transport security is required unless WithInsecure is set.

func WithKeepaliveParams added in v1.2.0 

func WithKeepaliveParams(kp keepalive.ClientParameters) DialOption

WithKeepaliveParams returns a DialOption that specifies keepalive parameters for the client transport.

func WithMaxMsgSize added in v1.2.0 

func WithMaxMsgSize(s int) DialOption

WithMaxMsgSize returns a DialOption which sets the maximum message size the client can receive. Deprecated: use WithDefaultCallOptions(MaxCallRecvMsgSize(s)) instead.

func WithPerRPCCredentials 

func WithPerRPCCredentials(creds credentials.PerRPCCredentials) DialOption

WithPerRPCCredentials returns a DialOption which sets credentials and places auth state on each outbound RPC.

func WithReadBufferSize added in v1.7.0 

func WithReadBufferSize(s int) DialOption

WithReadBufferSize lets you set the size of read buffer, this determines how much data can be read at most for each read syscall.

func WithServiceConfig added in v1.2.0 

func WithServiceConfig(c <-chan ServiceConfig) DialOption

WithServiceConfig returns a DialOption which has a channel to read the service configuration. DEPRECATED: service config should be received through name resolver, as specified here. https://github.com/grpc/grpc/blob/master/doc/service_config.md

func WithStatsHandler added in v1.2.0 

func WithStatsHandler(h stats.Handler) DialOption

WithStatsHandler returns a DialOption that specifies the stats handler for all the RPCs and underlying network connections in this ClientConn.

func WithStreamInterceptor added in v1.0.2 

func WithStreamInterceptor(f StreamClientInterceptor) DialOption

WithStreamInterceptor returns a DialOption that specifies the interceptor for streaming RPCs.

func WithTimeout 

func WithTimeout(d time.Duration) DialOption

WithTimeout returns a DialOption that configures a timeout for dialing a ClientConn initially. This is valid if and only if WithBlock() is present. Deprecated: use DialContext and context.WithTimeout instead.

func WithTransportCredentials 

func WithTransportCredentials(creds credentials.TransportCredentials) DialOption

WithTransportCredentials returns a DialOption which configures a connection level security credentials (e.g., TLS/SSL).

func WithUnaryInterceptor added in v1.0.2 

func WithUnaryInterceptor(f UnaryClientInterceptor) DialOption

WithUnaryInterceptor returns a DialOption that specifies the interceptor for unary RPCs.

func WithUserAgent 

func WithUserAgent(s string) DialOption

WithUserAgent returns a DialOption that specifies a user agent string for all the RPCs.

func WithWriteBufferSize added in v1.7.0 

func WithWriteBufferSize(s int) DialOption

WithWriteBufferSize lets you set the size of write buffer, this determines how much data can be batched before doing a write on the wire.

type EmptyCallOption added in v1.4.0 

type EmptyCallOption struct{}

EmptyCallOption does not alter the Call configuration. It can be embedded in another structure to carry satellite data for use by interceptors.

type MethodConfig added in v1.2.0 

type MethodConfig struct {
	// WaitForReady indicates whether RPCs sent to this method should wait until
	// the connection is ready by default (!failfast). The value specified via the
	// gRPC client API will override the value set here.
	WaitForReady *bool
	// Timeout is the default timeout for RPCs sent to this method. The actual
	// deadline used will be the minimum of the value specified here and the value
	// set by the application via the gRPC client API.  If either one is not set,
	// then the other will be used.  If neither is set, then the RPC has no deadline.
	Timeout *time.Duration
	// MaxReqSize is the maximum allowed payload size for an individual request in a
	// stream (client->server) in bytes. The size which is measured is the serialized
	// payload after per-message compression (but before stream compression) in bytes.
	// The actual value used is the minimum of the value specified here and the value set
	// by the application via the gRPC client API. If either one is not set, then the other
	// will be used.  If neither is set, then the built-in default is used.
	MaxReqSize *int
	// MaxRespSize is the maximum allowed payload size for an individual response in a
	// stream (server->client) in bytes.
	MaxRespSize *int
}

MethodConfig defines the configuration recommended by the service providers for a particular method. DEPRECATED: Users should not use this struct. Service config should be received through name resolver, as specified here https://github.com/grpc/grpc/blob/master/doc/service_config.md

type MethodDesc 

type MethodDesc struct {
	MethodName string
	Handler    methodHandler
}

MethodDesc represents an RPC service's method specification.

type MethodInfo 

type MethodInfo struct {
	// Name is the method name only, without the service name or package name.
	Name string
	// IsClientStream indicates whether the RPC is a client streaming RPC.
	IsClientStream bool
	// IsServerStream indicates whether the RPC is a server streaming RPC.
	IsServerStream bool
}

MethodInfo contains the information of an RPC including its method name and type.

type Server 

type Server struct {
	// contains filtered or unexported fields
}

Server is a gRPC server to serve RPC requests.

func NewServer 

func NewServer(opt ...ServerOption) *Server

NewServer creates a gRPC server which has no service registered and has not started to accept requests yet.

func (*Server) GetServiceInfo 

func (s *Server) GetServiceInfo() map[string]ServiceInfo

GetServiceInfo returns a map from service names to ServiceInfo. Service names include the package names, in the form of <package>.<service>.

func (*Server) GracefulStop added in v1.0.2 

func (s *Server) GracefulStop()

GracefulStop stops the gRPC server gracefully. It stops the server from accepting new connections and RPCs and blocks until all the pending RPCs are finished.

func (*Server) RegisterService 

func (s *Server) RegisterService(sd *ServiceDesc, ss interface{})

RegisterService registers a service and its implementation to the gRPC server. It is called from the IDL generated code. This must be called before invoking Serve.

func (*Server) Serve 

func (s *Server) Serve(lis net.Listener) error

Serve accepts incoming connections on the listener lis, creating a new ServerTransport and service goroutine for each. The service goroutines read gRPC requests and then call the registered handlers to reply to them. Serve returns when lis.Accept fails with fatal errors. lis will be closed when this method returns. Serve will return a non-nil error unless Stop or GracefulStop is called.

func (*Server) ServeHTTP 

func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request)

ServeHTTP implements the Go standard library's http.Handler interface by responding to the gRPC request r, by looking up the requested gRPC method in the gRPC server s.

The provided HTTP request must have arrived on an HTTP/2 connection. When using the Go standard library's server, practically this means that the Request must also have arrived over TLS.

To share one port (such as 443 for https) between gRPC and an existing http.Handler, use a root http.Handler such as: 

if r.ProtoMajor == 2 && strings.HasPrefix(
	r.Header.Get("Content-Type"), "application/grpc") {
	grpcServer.ServeHTTP(w, r)
} else {
	yourMux.ServeHTTP(w, r)
}

Note that ServeHTTP uses Go's HTTP/2 server implementation which is totally separate from grpc-go's HTTP/2 server. Performance and features may vary between the two paths. ServeHTTP does not support some gRPC features available through grpc-go's HTTP/2 server, and it is currently EXPERIMENTAL and subject to change.

func (*Server) Stop 

func (s *Server) Stop()

Stop stops the gRPC server. It immediately closes all open connections and listeners. It cancels all active RPCs on the server side and the corresponding pending RPCs on the client side will get notified by connection errors.

type ServerOption 

type ServerOption func(*options)

A ServerOption sets options such as credentials, codec and keepalive parameters, etc.

func ConnectionTimeout added in v1.7.3 

func ConnectionTimeout(d time.Duration) ServerOption

ConnectionTimeout returns a ServerOption that sets the timeout for connection establishment (up to and including HTTP/2 handshaking) for all new connections. If this is not set, the default is 120 seconds. A zero or negative value will result in an immediate timeout.

This API is EXPERIMENTAL.

func Creds 

func Creds(c credentials.TransportCredentials) ServerOption

Creds returns a ServerOption that sets credentials for server connections.

func CustomCodec 

func CustomCodec(codec Codec) ServerOption

CustomCodec returns a ServerOption that sets a codec for message marshaling and unmarshaling.

func InTapHandle added in v1.0.5 

func InTapHandle(h tap.ServerInHandle) ServerOption

InTapHandle returns a ServerOption that sets the tap handle for all the server transport to be created. Only one can be installed.

func InitialConnWindowSize added in v1.4.0 

func InitialConnWindowSize(s int32) ServerOption

InitialConnWindowSize returns a ServerOption that sets window size for a connection. The lower bound for window size is 64K and any value smaller than that will be ignored.

func InitialWindowSize added in v1.4.0 

func InitialWindowSize(s int32) ServerOption

InitialWindowSize returns a ServerOption that sets window size for stream. The lower bound for window size is 64K and any value smaller than that will be ignored.

func KeepaliveEnforcementPolicy added in v1.3.0 

func KeepaliveEnforcementPolicy(kep keepalive.EnforcementPolicy) ServerOption

KeepaliveEnforcementPolicy returns a ServerOption that sets keepalive enforcement policy for the server.

func KeepaliveParams added in v1.3.0 

func KeepaliveParams(kp keepalive.ServerParameters) ServerOption

KeepaliveParams returns a ServerOption that sets keepalive and max-age parameters for the server.

func MaxConcurrentStreams 

func MaxConcurrentStreams(n uint32) ServerOption

MaxConcurrentStreams returns a ServerOption that will apply a limit on the number of concurrent streams to each ServerTransport.

func MaxMsgSize added in v1.0.2 

func MaxMsgSize(m int) ServerOption

MaxMsgSize returns a ServerOption to set the max message size in bytes the server can receive. If this is not set, gRPC uses the default limit. Deprecated: use MaxRecvMsgSize instead.

func MaxRecvMsgSize added in v1.4.0 

func MaxRecvMsgSize(m int) ServerOption

MaxRecvMsgSize returns a ServerOption to set the max message size in bytes the server can receive. If this is not set, gRPC uses the default 4MB.

func MaxSendMsgSize added in v1.4.0 

func MaxSendMsgSize(m int) ServerOption

MaxSendMsgSize returns a ServerOption to set the max message size in bytes the server can send. If this is not set, gRPC uses the default 4MB.

func RPCCompressor deprecated 

func RPCCompressor(cp Compressor) ServerOption

RPCCompressor returns a ServerOption that sets a compressor for outbound messages. For backward compatibility, all outbound messages will be sent using this compressor, regardless of incoming message compression. By default, server messages will be sent using the same compressor with which request messages were sent.

Deprecated: use encoding.RegisterCompressor instead.

func RPCDecompressor deprecated 

func RPCDecompressor(dc Decompressor) ServerOption

RPCDecompressor returns a ServerOption that sets a decompressor for inbound messages. It has higher priority than decompressors registered via encoding.RegisterCompressor.

Deprecated: use encoding.RegisterCompressor instead.

func ReadBufferSize added in v1.7.0 

func ReadBufferSize(s int) ServerOption

ReadBufferSize lets you set the size of read buffer, this determines how much data can be read at most for one read syscall.

func StatsHandler added in v1.2.0 

func StatsHandler(h stats.Handler) ServerOption

StatsHandler returns a ServerOption that sets the stats handler for the server.

func StreamInterceptor 

func StreamInterceptor(i StreamServerInterceptor) ServerOption

StreamInterceptor returns a ServerOption that sets the StreamServerInterceptor for the server. Only one stream interceptor can be installed.

func UnaryInterceptor 

func UnaryInterceptor(i UnaryServerInterceptor) ServerOption

UnaryInterceptor returns a ServerOption that sets the UnaryServerInterceptor for the server. Only one unary interceptor can be installed. The construction of multiple interceptors (e.g., chaining) can be implemented at the caller.

func UnknownServiceHandler added in v1.2.0 

func UnknownServiceHandler(streamHandler StreamHandler) ServerOption

UnknownServiceHandler returns a ServerOption that allows for adding a custom unknown service handler. The provided method is a bidi-streaming RPC service handler that will be invoked instead of returning the "unimplemented" gRPC error whenever a request is received for an unregistered service or method. The handling function has full access to the Context of the request and the stream, and the invocation bypasses interceptors.

func WriteBufferSize added in v1.7.0 

func WriteBufferSize(s int) ServerOption

WriteBufferSize lets you set the size of write buffer, this determines how much data can be batched before doing a write on the wire.

type ServerStream 

type ServerStream interface {
	// SetHeader sets the header metadata. It may be called multiple times.
	// When call multiple times, all the provided metadata will be merged.
	// All the metadata will be sent out when one of the following happens:
	//  - ServerStream.SendHeader() is called;
	//  - The first response is sent out;
	//  - An RPC status is sent out (error or success).
	SetHeader(metadata.MD) error
	// SendHeader sends the header metadata.
	// The provided md and headers set by SetHeader() will be sent.
	// It fails if called multiple times.
	SendHeader(metadata.MD) error
	// SetTrailer sets the trailer metadata which will be sent with the RPC status.
	// When called more than once, all the provided metadata will be merged.
	SetTrailer(metadata.MD)
	Stream
}

ServerStream defines the interface a server stream has to satisfy.

type ServiceConfig added in v1.2.0 

type ServiceConfig struct {
	// LB is the load balancer the service providers recommends. The balancer specified
	// via grpc.WithBalancer will override this.
	LB *string
	// Methods contains a map for the methods in this service.
	// If there is an exact match for a method (i.e. /service/method) in the map, use the corresponding MethodConfig.
	// If there's no exact match, look for the default config for the service (/service/) and use the corresponding MethodConfig if it exists.
	// Otherwise, the method has no MethodConfig to use.
	Methods map[string]MethodConfig
}

ServiceConfig is provided by the service provider and contains parameters for how clients that connect to the service should behave. DEPRECATED: Users should not use this struct. Service config should be received through name resolver, as specified here https://github.com/grpc/grpc/blob/master/doc/service_config.md

type ServiceDesc 

type ServiceDesc struct {
	ServiceName string
	// The pointer to the service interface. Used to check whether the user
	// provided implementation satisfies the interface requirements.
	HandlerType interface{}
	Methods     []MethodDesc
	Streams     []StreamDesc
	Metadata    interface{}
}

ServiceDesc represents an RPC service's specification.

type ServiceInfo 

type ServiceInfo struct {
	Methods []MethodInfo
	// Metadata is the metadata specified in ServiceDesc when registering service.
	Metadata interface{}
}

ServiceInfo contains unary RPC method info, streaming RPC method info and metadata for a service.

type Stream 

type Stream interface {
	// Context returns the context for this stream.
	Context() context.Context
	// SendMsg blocks until it sends m, the stream is done or the stream
	// breaks.
	// On error, it aborts the stream and returns an RPC status on client
	// side. On server side, it simply returns the error to the caller.
	// SendMsg is called by generated code. Also Users can call SendMsg
	// directly when it is really needed in their use cases.
	// It's safe to have a goroutine calling SendMsg and another goroutine calling
	// recvMsg on the same stream at the same time.
	// But it is not safe to call SendMsg on the same stream in different goroutines.
	SendMsg(m interface{}) error
	// RecvMsg blocks until it receives a message or the stream is
	// done. On client side, it returns io.EOF when the stream is done. On
	// any other error, it aborts the stream and returns an RPC status. On
	// server side, it simply returns the error to the caller.
	// It's safe to have a goroutine calling SendMsg and another goroutine calling
	// recvMsg on the same stream at the same time.
	// But it is not safe to call RecvMsg on the same stream in different goroutines.
	RecvMsg(m interface{}) error
}

Stream defines the common interface a client or server stream has to satisfy.

type StreamClientInterceptor added in v1.0.2 

type StreamClientInterceptor func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, streamer Streamer, opts ...CallOption) (ClientStream, error)

StreamClientInterceptor intercepts the creation of ClientStream. It may return a custom ClientStream to intercept all I/O operations. streamer is the handler to create a ClientStream and it is the responsibility of the interceptor to call it. This is an EXPERIMENTAL API.

type StreamDesc 

type StreamDesc struct {
	StreamName string
	Handler    StreamHandler

	// At least one of these is true.
	ServerStreams bool
	ClientStreams bool
}

StreamDesc represents a streaming RPC service's method specification.

type StreamHandler 

type StreamHandler func(srv interface{}, stream ServerStream) error

StreamHandler defines the handler called by gRPC server to complete the execution of a streaming RPC.

type StreamServerInfo 

type StreamServerInfo struct {
	// FullMethod is the full RPC method string, i.e., /package.service/method.
	FullMethod string
	// IsClientStream indicates whether the RPC is a client streaming RPC.
	IsClientStream bool
	// IsServerStream indicates whether the RPC is a server streaming RPC.
	IsServerStream bool
}

StreamServerInfo consists of various information about a streaming RPC on server side. All per-rpc information may be mutated by the interceptor.

type StreamServerInterceptor 

type StreamServerInterceptor func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error

StreamServerInterceptor provides a hook to intercept the execution of a streaming RPC on the server. info contains all the information of this RPC the interceptor can operate on. And handler is the service method implementation. It is the responsibility of the interceptor to invoke handler to complete the RPC.

type Streamer added in v1.0.2 

type Streamer func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error)

Streamer is called by StreamClientInterceptor to create a ClientStream.

type UnaryClientInterceptor added in v1.0.2 

type UnaryClientInterceptor func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error

UnaryClientInterceptor intercepts the execution of a unary RPC on the client. invoker is the handler to complete the RPC and it is the responsibility of the interceptor to call it. This is an EXPERIMENTAL API.

type UnaryHandler 

type UnaryHandler func(ctx context.Context, req interface{}) (interface{}, error)

UnaryHandler defines the handler invoked by UnaryServerInterceptor to complete the normal execution of a unary RPC.

type UnaryInvoker added in v1.0.2 

type UnaryInvoker func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error

UnaryInvoker is called by UnaryClientInterceptor to complete RPCs.

type UnaryServerInfo 

type UnaryServerInfo struct {
	// Server is the service implementation the user provides. This is read-only.
	Server interface{}
	// FullMethod is the full RPC method string, i.e., /package.service/method.
	FullMethod string
}

UnaryServerInfo consists of various information about a unary RPC on server side. All per-rpc information may be mutated by the interceptor.

type UnaryServerInterceptor 

type UnaryServerInterceptor func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (resp interface{}, err error)

UnaryServerInterceptor provides a hook to intercept the execution of a unary RPC on the server. info contains all the information of this RPC the interceptor can operate on. And handler is the wrapper of the service method implementation. It is the responsibility of the interceptor to invoke handler to complete the RPC.

Source Files

View all Source files

Directories

Path Synopsis
Package balancer defines APIs for load balancing in gRPC.
 Package balancer defines APIs for load balancing in gRPC.
roundrobin
Package roundrobin defines a roundrobin balancer.
 Package roundrobin defines a roundrobin balancer.
Package benchmark implements the building blocks to setup end-to-end gRPC benchmarks.
 Package benchmark implements the building blocks to setup end-to-end gRPC benchmarks.
benchmain
Package main provides benchmark with setting flags.
 Package main provides benchmark with setting flags.
benchresult
To format the benchmark result: go run benchmark/benchresult/main.go resultfile To see the performance change based on a old result: go run benchmark/benchresult/main.go resultfile_old resultfile It will print the comparison result of intersection benchmarks between two files.
 To format the benchmark result: go run benchmark/benchresult/main.go resultfile To see the performance change based on a old result: go run benchmark/benchresult/main.go resultfile_old resultfile It will print the comparison result of intersection benchmarks between two files.
client
grpc_testing
Package grpc_testing is a generated protocol buffer package.
 Package grpc_testing is a generated protocol buffer package.
latency
Package latency provides wrappers for net.Conn, net.Listener, and net.Dialers, designed to interoperate to inject real-world latency into network connections.
 Package latency provides wrappers for net.Conn, net.Listener, and net.Dialers, designed to interoperate to inject real-world latency into network connections.
server
stats
worker
Package codes defines the canonical error codes used by gRPC.
 Package codes defines the canonical error codes used by gRPC.
Package connectivity defines connectivity semantics.
 Package connectivity defines connectivity semantics.
Package credentials implements various credentials supported by gRPC library, which encapsulate all the state needed by a client to authenticate with a server and make various assertions, e.g., about the client's identity, role, or whether it is authorized to make a particular call.
 Package credentials implements various credentials supported by gRPC library, which encapsulate all the state needed by a client to authenticate with a server and make various assertions, e.g., about the client's identity, role, or whether it is authorized to make a particular call.
oauth
Package oauth implements gRPC credentials using OAuth.
 Package oauth implements gRPC credentials using OAuth.
Package encoding defines the interface for the compressor and the functions to register and get the compossor.
 Package encoding defines the interface for the compressor and the functions to register and get the compossor.
gzip
Package gzip implements and registers the gzip compressor during the initialization.
 Package gzip implements and registers the gzip compressor during the initialization.
examples
helloworld/greeter_client
helloworld/greeter_server
helloworld/helloworld
Package helloworld is a generated protocol buffer package.
 Package helloworld is a generated protocol buffer package.
helloworld/mock_helloworld
route_guide/client
Package main implements a simple gRPC client that demonstrates how to use gRPC-Go libraries to perform unary, client streaming, server streaming and full duplex RPCs.
 Package main implements a simple gRPC client that demonstrates how to use gRPC-Go libraries to perform unary, client streaming, server streaming and full duplex RPCs.
route_guide/mock_routeguide
route_guide/routeguide
Package routeguide is a generated protocol buffer package.
 Package routeguide is a generated protocol buffer package.
route_guide/server
Package main implements a simple gRPC server that demonstrates how to use gRPC-Go libraries to perform unary, client streaming, server streaming and full duplex RPCs.
 Package main implements a simple gRPC server that demonstrates how to use gRPC-Go libraries to perform unary, client streaming, server streaming and full duplex RPCs.
grpclb
grpc_lb_v1/messages
Package messages is a generated protocol buffer package.
 Package messages is a generated protocol buffer package.
grpc_lb_v1/service
Package service is a generated protocol buffer package.
 Package service is a generated protocol buffer package.
Package grpclog defines logging for grpc.
 Package grpclog defines logging for grpc.
glogger
Package glogger defines glog-based logging for grpc.
 Package glogger defines glog-based logging for grpc.
Package health provides some utility functions to health-check a server.
 Package health provides some utility functions to health-check a server.
grpc_health_v1
Package grpc_health_v1 is a generated protocol buffer package.
 Package grpc_health_v1 is a generated protocol buffer package.
Package internal contains gRPC-internal code for testing, to avoid polluting the godoc of the top-level grpc package.
 Package internal contains gRPC-internal code for testing, to avoid polluting the godoc of the top-level grpc package.
client
grpc_testing
Package grpc_testing is a generated protocol buffer package.
 Package grpc_testing is a generated protocol buffer package.
http2
server
Package keepalive defines configurable parameters for point-to-point healthcheck.
 Package keepalive defines configurable parameters for point-to-point healthcheck.
Package metadata define the structure of the metadata supported by gRPC library.
 Package metadata define the structure of the metadata supported by gRPC library.
Package naming defines the naming API and related data structures for gRPC.
 Package naming defines the naming API and related data structures for gRPC.
Package peer defines various peer information associated with RPCs and corresponding utils.
 Package peer defines various peer information associated with RPCs and corresponding utils.
Package reflection implements server reflection service.
 Package reflection implements server reflection service.
grpc_reflection_v1alpha
Package grpc_reflection_v1alpha is a generated protocol buffer package.
 Package grpc_reflection_v1alpha is a generated protocol buffer package.
grpc_testing
Package grpc_testing is a generated protocol buffer package.
 Package grpc_testing is a generated protocol buffer package.
grpc_testingv3
Package grpc_testingv3 is a generated protocol buffer package.
 Package grpc_testingv3 is a generated protocol buffer package.
Package resolver defines APIs for name resolution in gRPC.
 Package resolver defines APIs for name resolution in gRPC.
dns
Package dns implements a dns resolver to be installed as the default resolver in grpc.
 Package dns implements a dns resolver to be installed as the default resolver in grpc.
manual
Package manual contains a resolver for testing purpose only.
 Package manual contains a resolver for testing purpose only.
passthrough
Package passthrough implements a pass-through resolver.
 Package passthrough implements a pass-through resolver.
Package stats is for collecting and reporting various network and RPC stats.
 Package stats is for collecting and reporting various network and RPC stats.
grpc_testing
Package grpc_testing is a generated protocol buffer package.
 Package grpc_testing is a generated protocol buffer package.
Package status implements errors returned by gRPC.
 Package status implements errors returned by gRPC.
stress
client
client starts an interop client to do stress test and a metrics server to report qps.
 client starts an interop client to do stress test and a metrics server to report qps.
grpc_testing
Package grpc_testing is a generated protocol buffer package.
 Package grpc_testing is a generated protocol buffer package.
metrics_client
Package tap defines the function handles which are executed on the transport layer of gRPC-Go and related information.
 Package tap defines the function handles which are executed on the transport layer of gRPC-Go and related information.
bufconn
Package bufconn provides a net.Conn implemented by a buffer and related dialing and listening functionality.
 Package bufconn provides a net.Conn implemented by a buffer and related dialing and listening functionality.
codec_perf
Package codec_perf is a generated protocol buffer package.
 Package codec_perf is a generated protocol buffer package.
grpc_testing
Package grpc_testing is a generated protocol buffer package.
 Package grpc_testing is a generated protocol buffer package.
leakcheck
Package leakcheck contains functions to check leaked goroutines.
 Package leakcheck contains functions to check leaked goroutines.
Package transport defines and implements message oriented communication channel to complete various transactions (e.g., an RPC).
 Package transport defines and implements message oriented communication channel to complete various transactions (e.g., an RPC).

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