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Package grpc

v1.46.0
Latest Go to latest
Published: May 21, 2020 | License: MIT | Module: go.uber.org/yarpc

Overview

Package grpc implements a YARPC transport based on the gRPC protocol. The gRPC transport provides support for unary and streaming RPCs.

Usage

A gRPC Transport must be constructed to use this transport.

grpcTransport := grpc.NewTransport()

To serve your YARPC application over gRPC, pass a gRPC inbound in your yarpc.Config.

listener, err := net.Listen("tcp", ":8080")
if err != nil {
  return err
}
myInbound := grpcTransport.NewInbound(listener)
dispatcher := yarpc.NewDispatcher(yarpc.Config{
  Name: "myservice",
  Inbounds: yarpc.Inbounds{myInbound},
})

To configure TLS on your service listener, pass credentials.TransportCredentials as an InboundCredentials InboundOption. There are various ways to create credentials.TransportCredentials. See https://godoc.org/google.golang.org/grpc/credentials#TransportCredentials.

listener, err := net.Listen("tcp", ":4443")
if err != nil {
  return err
}

myTLSConfig := &tls.Config{
  // any arbitrary valid tls.Config
}
myTransportCredentials := credentials.NewTLS(myTLSConfig)
myInbound := grpcTransport.NewInbound(
  listener,
  InboundCredentials(myInboundCredentials),
)
dispatcher := yarpc.NewDispatcher(yarpc.Config{
  Name: "myservice",
  Inbounds: yarpc.Inbounds{myInbound},
})

To make requests to a YARPC application that supports gRPC, pass a gRPC outbound in your yarpc.Config.

myserviceOutbound := grpcTransport.NewSingleOutbound("127.0.0.1:8080")
dispatcher := yarpc.NewDispatcher(yarpc.Config{
  Name: "myclient",
  Outbounds: yarpc.Outbounds{
    "myservice": {Unary: myserviceOutbound},
  },
})

To make requests using TLS to an application supporting gRPC over TLS, pass credentials.TransportCredentials as a DialerCredentials DialOption. There are various ways to create credentials.TransportCredentials. See https://godoc.org/google.golang.org/grpc/credentials#TransportCredentials.

myTLSConfig := &tls.Config{
  // any arbitrary valid tls.Config
}
myTransportCredentials := credentials.NewTLS(myTLSConfig)
myChooser := peer.NewSingle(
  hostport.Identify("127.0.0.1:4443"),
  grpcTransport.NewDialer(DialerCredentials(myTransportCredentials)),
)
myserviceOutbound := grpcTransport.NewOutbound(myChooser)
dispatcher := yarpc.NewDispatcher(yarpc.Config{
  Name: "myclient",
  Outbounds: yarpc.Outbounds{
    "myservice": {Unary: myserviceOutbound},
  },
})

Configuration

A gRPC transport may be configured using YARPC's configuration system. See TransportConfig, InboundConfig, and OutboundConfig for details on the different configuration parameters supported by this transport.

See Also

gRPC Project Page: https://grpc.io gRPC Wire Protocol Definition: https://grpc.io/docs/guides/wire.html gRPC Golang Library: https://github.com/grpc/grpc-go

Index

Package Files

Constants

const (
	// CallerHeader is the header key for the name of the service sending the
	// request. This corresponds to the Request.Caller attribute.
	// This header is required.
	CallerHeader = "rpc-caller"
	// ServiceHeader is the header key for the name of the service to which
	// the request is being sent. This corresponds to the Request.Service attribute.
	// This header is also used in responses to ensure requests are processed by the
	// correct service.
	// This header is required.
	ServiceHeader = "rpc-service"
	// ShardKeyHeader is the header key for the shard key used by the destined service
	// to shard the request. This corresponds to the Request.ShardKey attribute.
	// This header is optional.
	ShardKeyHeader = "rpc-shard-key"
	// RoutingKeyHeader is the header key for the traffic group responsible for
	// handling the request. This corresponds to the Request.RoutingKey attribute.
	// This header is optional.
	RoutingKeyHeader = "rpc-routing-key"
	// RoutingDelegateHeader is the header key for a service that can proxy the
	// destined service. This corresponds to the Request.RoutingDelegate attribute.
	// This header is optional.
	RoutingDelegateHeader = "rpc-routing-delegate"
	// EncodingHeader is the header key for the encoding used for the request body.
	// This corresponds to the Request.Encoding attribute.
	// If this is not set, content-type will attempt to be read for the encoding per
	// the gRPC wire format http://www.grpc.io/docs/guides/wire.html
	// For example, a content-type of "application/grpc+proto" will be intepreted
	// as the proto encoding.
	// This header is required unless content-type is set properly.
	EncodingHeader = "rpc-encoding"
	// ErrorNameHeader is the header key for the error name.
	ErrorNameHeader = "rpc-error-name"
	// ApplicationErrorHeader is the header key that will contain a non-empty value
	// if there was an application error.
	ApplicationErrorHeader = "rpc-application-error"

	// ApplicationErrorHeaderValue is the value that will be set for
	// ApplicationErrorHeader is there was an application error.
	//
	// The definition says any non-empty value is valid, however this is
	// the specific value that will be used for now.
	ApplicationErrorHeaderValue = "error"
)
const TransportName = "grpc"

TransportName is the name of the transport.

This value is what is used as transport.Request#Transport and transport.Namer for Outbounds.

const UserAgent = "yarpc-go/" + yarpc.Version

UserAgent is the User-Agent that will be set for requests. http://www.grpc.io/docs/guides/wire.html#user-agents

func TransportSpec

func TransportSpec(opts ...Option) yarpcconfig.TransportSpec

TransportSpec returns a TransportSpec for the gRPC transport.

See TransportConfig, InboundConfig, and OutboundConfig for details on the different configuration parameters supported by this Transport.

Any TransportOption, InboundOption, or OutboundOption may be passed to this function. These options will be applied BEFORE configuration parameters are interpreted. This allows configuration parameters to override Options provided to TransportSpec.

type DialOption

type DialOption func(*dialOptions)

DialOption is an option that influences grpc.Dial.

func Compressor

func Compressor(compressor transport.Compressor) DialOption

Compressor sets the compressor to be used by default for gRPC connections

func ContextDialer

func ContextDialer(f func(context.Context, string) (net.Conn, error)) DialOption

ContextDialer sets the dialer for creating outbound connections.

See https://godoc.org/google.golang.org/grpc#WithContextDialer for more details.

func DialerCredentials

func DialerCredentials(creds credentials.TransportCredentials) DialOption

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

type Dialer

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

Dialer is a decorator for a gRPC transport that threads dial options for every retained peer.

func (*Dialer) ReleasePeer

func (d *Dialer) ReleasePeer(id peer.Identifier, ps peer.Subscriber) error

ReleasePeer releases the identified peer.

func (*Dialer) RetainPeer

func (d *Dialer) RetainPeer(id peer.Identifier, ps peer.Subscriber) (peer.Peer, error)

RetainPeer retains the identified peer, passing dial options.

type Inbound

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

Inbound is a grpc transport.Inbound.

func (*Inbound) Addr

func (i *Inbound) Addr() net.Addr

Addr returns the address on which the server is listening.

Returns nil if Start has not been called yet

func (*Inbound) Introspect

func (i *Inbound) Introspect() introspection.InboundStatus

Introspect returns the current state of the inbound.

func (*Inbound) IsRunning

func (i *Inbound) IsRunning() bool

IsRunning implements transport.Lifecycle#IsRunning.

func (*Inbound) SetRouter

func (i *Inbound) SetRouter(router transport.Router)

SetRouter implements transport.Inbound#SetRouter.

func (*Inbound) Start

func (i *Inbound) Start() error

Start implements transport.Lifecycle#Start.

func (*Inbound) Stop

func (i *Inbound) Stop() error

Stop implements transport.Lifecycle#Stop.

func (*Inbound) Transports

func (i *Inbound) Transports() []transport.Transport

Transports implements transport.Inbound#Transports.

type InboundConfig

type InboundConfig struct {
	// Address to listen on. This field is required.
	Address string           `config:"address,interpolate"`
	TLS     InboundTLSConfig `config:"tls"`
}

InboundConfig configures a gRPC Inbound.

inbounds:

grpc:
  address: ":80"

A gRPC inbound can also enable TLS from key and cert files.

inbounds:

grpc:
  address: ":443"
  tls:
    enabled: true
    keyFile: "/path/to/key"
    certFile: "/path/to/cert"

type InboundOption

type InboundOption func(*inboundOptions)

InboundOption is an option for an inbound.

func InboundCredentials

func InboundCredentials(creds credentials.TransportCredentials) InboundOption

InboundCredentials returns an InboundOption that sets credentials for incoming connections.

type InboundTLSConfig

type InboundTLSConfig struct {
	Enabled  bool   `config:"enabled"` // disabled by default
	CertFile string `config:"certFile,interpolate"`
	KeyFile  string `config:"keyFile,interpolate"`
}

InboundTLSConfig specifies the TLS configuration for the gRPC inbound.

type Option

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

Option is an interface shared by TransportOption, InboundOption, and OutboundOption allowing either to be recognized by TransportSpec().

type Outbound

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

Outbound is a transport.UnaryOutbound.

func (*Outbound) Call

func (o *Outbound) Call(ctx context.Context, request *transport.Request) (*transport.Response, error)

Call implements transport.UnaryOutbound#Call.

func (*Outbound) CallStream

func (o *Outbound) CallStream(ctx context.Context, request *transport.StreamRequest) (*transport.ClientStream, error)

CallStream implements transport.StreamOutbound#CallStream.

func (*Outbound) Chooser

func (o *Outbound) Chooser() peer.Chooser

Chooser returns the peer.Chooser associated with this Outbound.

func (*Outbound) IsRunning

func (o *Outbound) IsRunning() bool

IsRunning implements transport.Lifecycle#IsRunning.

func (*Outbound) Start

func (o *Outbound) Start() error

Start implements transport.Lifecycle#Start.

func (*Outbound) Stop

func (o *Outbound) Stop() error

Stop implements transport.Lifecycle#Stop.

func (*Outbound) TransportName

func (o *Outbound) TransportName() string

TransportName is the transport name that will be set on `transport.Request` struct.

func (*Outbound) Transports

func (o *Outbound) Transports() []transport.Transport

Transports implements transport.Inbound#Transports.

type OutboundConfig

type OutboundConfig struct {
	yarpcconfig.PeerChooser

	// Address to connect to if no peer options set.
	Address string            `config:"address,interpolate"`
	TLS     OutboundTLSConfig `config:"tls"`
	// Compressor to use by default if the server side supports it
	Compressor string `config:"compressor"`
}

OutboundConfig configures a gRPC Outbound.

outbounds:

myservice:
  grpc:
    address: ":80"

A gRPC outbound can also configure a peer list.

outbounds:
  myservice:
    grpc:
      round-robin:
        peers:
          - 127.0.0.1:8080
          - 127.0.0.1:8081

A gRPC outbound can enable TLS using the system cert.Pool.

outbounds:
  theirsecureservice:
    grpc:
      address: ":443"
      tls:
        enabled: true
      compressor: gzip

type OutboundOption

type OutboundOption func(*outboundOptions)

OutboundOption is an option for an outbound.

type OutboundTLSConfig

type OutboundTLSConfig struct {
	Enabled bool `config:"enabled"`
}

OutboundTLSConfig configures TLS for a gRPC outbound.

type Transport

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

Transport is a grpc transport.Transport.

This currently does not have any additional functionality over creating an Inbound or Outbound separately, but may in the future.

func NewTransport

func NewTransport(options ...TransportOption) *Transport

NewTransport returns a new Transport.

func (*Transport) IsRunning

func (t *Transport) IsRunning() bool

IsRunning implements transport.Lifecycle#IsRunning.

func (*Transport) NewDialer

func (t *Transport) NewDialer(options ...DialOption) *Dialer

NewDialer creates a transport that is decorated to retain peers with additional gRPC dial options.

func (*Transport) NewInbound

func (t *Transport) NewInbound(listener net.Listener, options ...InboundOption) *Inbound

NewInbound returns a new Inbound for the given listener.

func (*Transport) NewOutbound

func (t *Transport) NewOutbound(peerChooser peer.Chooser, options ...OutboundOption) *Outbound

NewOutbound returns a new Outbound for the given peer.Chooser.

func (*Transport) NewSingleOutbound

func (t *Transport) NewSingleOutbound(address string, options ...OutboundOption) *Outbound

NewSingleOutbound returns a new Outbound for the given adrress. Note: This does not support TLS. See TLS example in doc.go.

func (*Transport) ReleasePeer

func (t *Transport) ReleasePeer(pid peer.Identifier, ps peer.Subscriber) error

ReleasePeer releases the peer.

Deprecated: use grpcTransport.NewDialer(...grpc.DialOption) to create a peer.Transport that supports custom DialOptions instead of using the grpc.Transport as a peer.Transport.

func (*Transport) RetainPeer

func (t *Transport) RetainPeer(pid peer.Identifier, ps peer.Subscriber) (peer.Peer, error)

RetainPeer retains the peer.

Deprecated: use grpcTransport.NewDialer(...grpc.DialOption) to create a peer.Transport that supports custom DialOptions instead of using the grpc.Transport as a peer.Transport.

func (*Transport) Start

func (t *Transport) Start() error

Start implements transport.Lifecycle#Start.

func (*Transport) Stop

func (t *Transport) Stop() error

Stop implements transport.Lifecycle#Stop.

type TransportConfig

type TransportConfig struct {
	ServerMaxRecvMsgSize int                 `config:"serverMaxRecvMsgSize"`
	ServerMaxSendMsgSize int                 `config:"serverMaxSendMsgSize"`
	ClientMaxRecvMsgSize int                 `config:"clientMaxRecvMsgSize"`
	ClientMaxSendMsgSize int                 `config:"clientMaxSendMsgSize"`
	Backoff              yarpcconfig.Backoff `config:"backoff"`
}

TransportConfig configures a gRPC Transport. This is shared between all gRPC inbounds and outbounds of a Dispatcher.

transports:
  grpc:
    backoff:
      exponential:
        first: 10ms
        max: 30s

All parameters of TransportConfig are optional. This section may be omitted in the transports section.

type TransportOption

type TransportOption func(*transportOptions)

TransportOption is an option for a transport.

func BackoffStrategy

func BackoffStrategy(backoffStrategy backoff.Strategy) TransportOption

BackoffStrategy specifies the backoff strategy for delays between connection attempts for each peer.

The default is exponential backoff starting with 10ms fully jittered, doubling each attempt, with a maximum interval of 30s.

func ClientMaxRecvMsgSize

func ClientMaxRecvMsgSize(clientMaxRecvMsgSize int) TransportOption

ClientMaxRecvMsgSize is the maximum message size the client can receive.

The default is 4MB.

func ClientMaxSendMsgSize

func ClientMaxSendMsgSize(clientMaxSendMsgSize int) TransportOption

ClientMaxSendMsgSize is the maximum message size the client can send.

The default is unlimited.

func Logger

func Logger(logger *zap.Logger) TransportOption

Logger sets a logger to use for internal logging.

The default is to not write any logs.

func ServerMaxRecvMsgSize

func ServerMaxRecvMsgSize(serverMaxRecvMsgSize int) TransportOption

ServerMaxRecvMsgSize is the maximum message size the server can receive.

The default is 4MB.

func ServerMaxSendMsgSize

func ServerMaxSendMsgSize(serverMaxSendMsgSize int) TransportOption

ServerMaxSendMsgSize is the maximum message size the server can send.

The default is unlimited.

func Tracer

func Tracer(tracer opentracing.Tracer) TransportOption

Tracer specifies the tracer to use.

By default, opentracing.GlobalTracer() is used.

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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