yarpc

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Version: v1.54.2 Latest Latest
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Published: Jun 11, 2021 License: MIT Imports: 36 Imported by: 158

README

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A message passing platform for Go that lets you:

  • Write servers and clients with various encodings, including JSON, Thrift, and Protobuf.
  • Expose servers over many transports simultaneously, including HTTP/1.1, gRPC, and TChannel.
  • Migrate outbound calls between transports without any code changes using config.

Installation

We recommend locking to SemVer range ^1 using Glide:

glide get 'go.uber.org/yarpc#^1'

Stability

This library is v1 and follows SemVer strictly.

No breaking changes will be made to exported APIs before v2.0.0 with the exception of experimental packages.

Experimental packages reside within packages named x, and are not stable. This means their APIs can break at any time. The intention here is to validate these APIs and iterate on them by working closely with internal customers. Once stable, their contents will be moved out of the containing x package and their APIs will be locked.

Development

Setup

To start developing with yarpc-go, run the following command to setup your environment:

cd $GOPATH/src
git clone https://github.com/yarpc/yarpc-go.git go.uber.org/yarpc
make
Running Tests

To run tests into a pre-configured docker container, run the following command:

make test

To run tests locally, run the following command:

SUPPRESS_DOCKER=1 make test

Happy development!

Documentation

Overview

Package yarpc provides the YARPC service framework.

With hundreds to thousands of services communicating with RPC, transport protocols (like HTTP and TChannel), encoding protocols (like JSON or Thrift), and peer choosers are the concepts that vary year over year. Separating these concerns allows services to change transports and wire protocols without changing call sites or request handlers, build proxies and wire protocol bridges, or experiment with load balancing strategies. YARPC is a toolkit for services and proxies.

YARPC breaks RPC into interchangeable encodings, transports, and peer choosers. YARPC for Go provides reference implementations for HTTP/1.1, TChannel and gRPC transports, and also raw, JSON, Thrift, and Protobuf encodings. YARPC for Go provides a round robin peer chooser and experimental implementations for debug pages and rate limiting. YARPC for Go plans to provide a load balancer that uses a least-pending-requests strategy. Peer choosers can implement any strategy, including load balancing or sharding, in turn bound to any peer list updater.

Regardless of transport, every RPC has some common properties: caller name, service name, procedure name, encoding name, deadline or TTL, headers, baggage (multi-hop headers), and tracing. Each RPC can also have an optional shard key, routing key, or routing delegate for advanced routing. YARPC transports use a shared API for capturing RPC metadata, so middleware can apply to requests over any transport.

Each YARPC transport protocol can implement inbound handlers and outbound callers. Each of these can support different RPC types, like unary (request and response) or oneway (request and receipt) RPC. A future release of YARPC will add support for other RPC types including variations on streaming and pubsub.

Index

Examples

Constants

View Source
const Version = "1.54.2"

Version is the current version of YARPC.

Variables

View Source
var OpentracingTags = opentracing.Tags{
	"yarpc.version": Version,
	"go.version":    runtime.Version(),
}

OpentracingTags are tags with YARPC metadata.

View Source
var PackageVersions = []introspection.PackageVersion{
	{Name: "yarpc", Version: Version},
	{Name: "tchannel", Version: tchannel.VersionInfo},
	{Name: "thriftrw", Version: thriftrw.Version},
	{Name: "grpc-go", Version: grpc.Version},
	{Name: "go", Version: runtime.Version()},
}

PackageVersions is a list of packages with corresponding versions.

Functions

func CanonicalizeHeaderKey

func CanonicalizeHeaderKey(k string) string

CanonicalizeHeaderKey canonicalizes the given header key to the same form used by the headers map returned by ResponseHeaders.

var headers map[string]string
res, err := client.Call(ctx, "hello", requestBody, ResponseHeaders(&headers))
email, ok := headers[CanonicalizeHeaderKey("User-Email-Address")]

func InjectClients added in v0.4.0

func InjectClients(src transport.ClientConfigProvider, dest interface{})

InjectClients injects clients from a Dispatcher into the given struct. dest must be a pointer to a struct with zero or more exported fields which hold YARPC client types. This includes json.Client, raw.Client, and any generated Thrift service client. Fields with nil values and a `service` tag will be populated with clients using that service`s ClientConfig.

Given,

type Handler struct {
	KeyValueClient keyvalueclient.Interface `service:"keyvalue"`
	UserClient json.Client `service:"users"`
	TagClient tagclient.Interface  // no tag; will be left unchanged
}

The call,

var h Handler
yarpc.InjectClients(dispatcher, &h)

Is equivalent to,

var h Handler
h.KeyValueClient = keyvalueclient.New(dispatcher.ClientConfig("keyvalue"))
h.UserClient = json.New(dispatcher.ClientConfig("users"))

Builder functions for different client types may be registered using the RegisterClientBuilder function.

This function panics if a field with an unknown type and nil value has the `service` tag.

func IsBadRequestError deprecated added in v1.0.0

This function has been deprecated.
func IsBadRequestError(err error) bool

IsBadRequestError returns true on an error returned by RPC clients if the request was rejected by YARPC because it was invalid.

res, err := client.Call(...)
if yarpc.IsBadRequestError(err) {
	fmt.Println("invalid request:", err)
}

Deprecated: use yarpcerrors.FromError(err).Code() == yarpcerrors.CodeInvalidArgument instead.

func IsTimeoutError deprecated added in v1.0.0

This function has been deprecated.
func IsTimeoutError(err error) bool

IsTimeoutError returns true on an error returned by RPC clients if the given error is a TimeoutError.

res, err := client.Call(...)
if yarpc.IsTimeoutError(err) {
	fmt.Println("request timed out:", err)
}

Deprecated: use yarpcerrors.FromError(err).Code() == yarpcerrors.CodeDeadlineExceeded instead.

func IsUnexpectedError deprecated added in v1.0.0

This function has been deprecated.
func IsUnexpectedError(err error) bool

IsUnexpectedError returns true on an error returned by RPC clients if the server panicked or failed with an unhandled error.

res, err := client.Call(...)
if yarpc.IsUnexpectedError(err) {
	fmt.Println("internal server error:", err)
}

Deprecated: use yarpcerrors.FromError(err).Code() == yarpcerrors.CodeInternal instead.

func OnewayInboundMiddleware added in v1.0.0

func OnewayInboundMiddleware(mw ...middleware.OnewayInbound) middleware.OnewayInbound

OnewayInboundMiddleware combines the given collection of unary inbound middleware in-order into a single OnewayInbound middleware.

func OnewayOutboundMiddleware added in v1.0.0

func OnewayOutboundMiddleware(mw ...middleware.OnewayOutbound) middleware.OnewayOutbound

OnewayOutboundMiddleware combines the given collection of unary outbound middleware in-order into a single OnewayOutbound middleware.

func RegisterClientBuilder added in v0.4.0

func RegisterClientBuilder(f interface{}) (forget func())

RegisterClientBuilder registers a builder function for a specific client type.

Functions must have one of the following signatures:

func(transport.ClientConfig) T
func(transport.ClientConfig, reflect.StructField) T

Where T is the type of the client. T MUST be an interface. In the second form, the function receives type information about the field being filled. It may inspect the struct tags to customize its behavior.

This function panics if a client for the given type has already been registered.

After a builder function for a client type is registered, these objects can be instantiated automatically using InjectClients.

A function to unregister the builder function is returned. Note that the function will clear whatever the corresponding type's builder function is at the time it is called, regardless of whether the value matches what was passed to this function or not.

func StreamInboundMiddleware added in v1.27.0

func StreamInboundMiddleware(mw ...middleware.StreamInbound) middleware.StreamInbound

StreamInboundMiddleware combines the given collection of unary inbound middleware in-order into a single StreamInbound middleware.

func StreamOutboundMiddleware added in v1.27.0

func StreamOutboundMiddleware(mw ...middleware.StreamOutbound) middleware.StreamOutbound

StreamOutboundMiddleware combines the given collection of unary outbound middleware in-order into a single StreamOutbound middleware.

func UnaryInboundMiddleware added in v1.0.0

func UnaryInboundMiddleware(mw ...middleware.UnaryInbound) middleware.UnaryInbound

UnaryInboundMiddleware combines the given collection of unary inbound middleware in-order into a single UnaryInbound middleware.

func UnaryOutboundMiddleware added in v1.0.0

func UnaryOutboundMiddleware(mw ...middleware.UnaryOutbound) middleware.UnaryOutbound

UnaryOutboundMiddleware combines the given collection of unary outbound middleware in-order into a single UnaryOutbound middleware.

Types

type Ack added in v1.0.0

type Ack interface {
	fmt.Stringer
}

Ack represents an acknowledgement from a oneway request.

type Call added in v1.0.0

type Call encoding.Call

Call provides information about the current request inside handlers. An instance of Call for the current request can be obtained by calling CallFromContext on the request context.

func Get(ctx context.Context, req *GetRequest) (*GetResponse, error) {
	call := yarpc.CallFromContext(ctx)
	fmt.Println("Received request from", call.Caller())
	if err := call.WriteResponseHeader("hello", "world"); err != nil {
		return nil, err
	}
	return response, nil
}

func CallFromContext added in v1.0.0

func CallFromContext(ctx context.Context) *Call

CallFromContext retrieves information about the current incoming request from the given context. Returns nil if the context is not a valid request context.

The object is valid only as long as the request is ongoing.

Testing

To test functions which use CallFromContext, use yarpctest.ContextWithCall to build contexts compatible with this function.

func (*Call) Caller added in v1.0.0

func (c *Call) Caller() string

Caller returns the name of the service making this request.

func (*Call) CallerProcedure added in v1.53.0

func (c *Call) CallerProcedure() string

CallerProcedure returns the name of the procedure from the service making this request.

func (*Call) Encoding added in v1.0.0

func (c *Call) Encoding() transport.Encoding

Encoding returns the encoding for this request.

func (*Call) Header added in v1.0.0

func (c *Call) Header(k string) string

Header returns the value of the given request header provided with the request.

func (*Call) HeaderNames added in v1.0.0

func (c *Call) HeaderNames() []string

HeaderNames returns a sorted list of the names of user defined headers provided with this request.

func (*Call) Procedure added in v1.0.0

func (c *Call) Procedure() string

Procedure returns the name of the procedure being called.

func (*Call) RoutingDelegate added in v1.0.0

func (c *Call) RoutingDelegate() string

RoutingDelegate returns the routing delegate for this request.

func (*Call) RoutingKey added in v1.0.0

func (c *Call) RoutingKey() string

RoutingKey returns the routing key for this request.

func (*Call) Service added in v1.0.0

func (c *Call) Service() string

Service returns the name of the service being called.

func (*Call) ShardKey added in v1.0.0

func (c *Call) ShardKey() string

ShardKey returns the shard key for this request.

func (*Call) Transport added in v1.32.0

func (c *Call) Transport() string

Transport returns the name of the transport being called.

func (*Call) WriteResponseHeader added in v1.0.0

func (c *Call) WriteResponseHeader(k, v string) error

WriteResponseHeader writes headers to the response of this call.

type CallOption added in v1.0.0

type CallOption encoding.CallOption

CallOption defines options that may be passed in at call sites to other services.

These may be used to add or alter the request.

func ResponseHeaders added in v1.0.0

func ResponseHeaders(h *map[string]string) CallOption

ResponseHeaders specifies that headers received in response to this request should replace the given map.

Header keys in the map are normalized using the CanonicalizeHeaderKey function.

var resHeaders map[string]string
resBody, err := client.SetValue(ctx, key, value, yarpc.ResponseHeaders(&resHeaders))
value, ok := resHeaders[yarpc.CanonicalizeHeaderKey("foo")]

Note that the map is replaced completely. Entries it had before making the call will not be available afterwards.

headers := map[string]string{"hello": "world"}
resBody, err := client.SetValue(ctx, key, value, yarpc.ResponseHeaders(&headers))
_, ok := headers["hello"]
fmt.Println(ok)  // false

func WithHeader added in v1.0.0

func WithHeader(k, v string) CallOption

WithHeader adds a new header to the request. Header keys are case insensitive.

_, err := client.GetValue(ctx, reqBody, yarpc.WithHeader("Token", "10"))
// ==> {"token": "10"}

If multiple entries have the same normalized header name, newer entries override older ones.

func WithRoutingDelegate added in v1.0.0

func WithRoutingDelegate(rd string) CallOption

WithRoutingDelegate sets the routing delegate for the request.

func WithRoutingKey added in v1.0.0

func WithRoutingKey(rk string) CallOption

WithRoutingKey sets the routing key for the request.

func WithShardKey added in v1.0.0

func WithShardKey(sk string) CallOption

WithShardKey sets the shard key for the request.

type ClientConfig added in v1.13.0

type ClientConfig interface {
	transport.ClientConfigProvider
}

ClientConfig builds transport.ClientConfigs which specify the means of making a request from this service to another service by name.

type Config

type Config struct {
	// Name of the service. This is the name used by other services when
	// making requests to this service.
	Name string

	// Inbounds define how this service receives incoming requests from other
	// services.
	//
	// This may be nil if this service does not receive any requests.
	Inbounds Inbounds

	// Outbounds defines how this service makes requests to other services.
	//
	// This may be nil if this service does not send any requests.
	Outbounds Outbounds

	// Inbound and Outbound Middleware that will be applied to all incoming
	// and outgoing requests respectively.
	//
	// These may be nil if there is no middleware to apply.
	InboundMiddleware  InboundMiddleware
	OutboundMiddleware OutboundMiddleware

	// Tracer is meant to add/record tracing information to a request.
	//
	// Deprecated: The dispatcher does nothing with this property.  Set the
	// tracer directly on the transports used to build inbounds and outbounds.
	Tracer opentracing.Tracer

	// RouterMiddleware is middleware to control how requests are routed.
	RouterMiddleware middleware.Router

	// Configures logging.
	Logging LoggingConfig

	// Configures telemetry.
	Metrics MetricsConfig

	// DisableAutoObservabilityMiddleware is used to stop the dispatcher from
	// automatically attaching observability middleware to all inbounds and
	// outbounds.  It is the assumption that if if this option is disabled the
	// observability middleware is being inserted in the Inbound/Outbound
	// Middleware.
	DisableAutoObservabilityMiddleware bool
}

Config specifies the parameters of a new Dispatcher constructed via NewDispatcher.

type DirectionalLogLevelConfig added in v1.40.0

type DirectionalLogLevelConfig struct {
	// Level at which successful requests are logged.
	// Defaults to DebugLevel.
	Success *zapcore.Level
	// Level at which errors are logged.
	// Thrift exceptions are application errors, which we log as a separate
	// class from success and failure.
	// Deprecated in favor of ServerError and ClientError.
	Failure *zapcore.Level
	// Level at which application errors are logged.
	// All Thrift exceptions are considered application errors.
	// All errors from Protobuf handlers are application errors.
	// Defaults to ErrorLevel.
	// Deprecated in favor of ServerError and ClientError.
	ApplicationError *zapcore.Level
	// Level at which client errors are logged.
	// All Thrift exceptions are considered application errors if
	// they are not annotated with the option rpc.code.
	// Defaults to ErrorLevel.
	ClientError *zapcore.Level
	// Level at which server errors are logged.
	// Defaults to ErrorLevel.
	ServerError *zapcore.Level
}

DirectionalLogLevelConfig may override the log levels for any combination of successes, failures, and application errors.

type Dispatcher

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

Dispatcher encapsulates a YARPC application. It acts as the entry point to send and receive YARPC requests in a transport and encoding agnostic way.

Example (Minimal)
package main

import (
	"log"

	"go.uber.org/yarpc"
)

func main() {
	dispatcher := yarpc.NewDispatcher(yarpc.Config{Name: "my-fancy-service"})
	if err := dispatcher.Start(); err != nil {
		log.Fatal(err)
	}
	defer dispatcher.Stop()
}
Output:

func NewDispatcher

func NewDispatcher(cfg Config) *Dispatcher

NewDispatcher builds a new Dispatcher using the specified Config. At minimum, a service name must be specified.

Invalid configurations or errors in constructing the Dispatcher will cause panics.

func (*Dispatcher) ClientConfig added in v1.0.0

func (d *Dispatcher) ClientConfig(outboundKey string) transport.ClientConfig

ClientConfig provides the configuration needed to talk to the given service through an outboundKey. This configuration may be directly passed into encoding-specific RPC clients.

keyvalueClient := json.New(dispatcher.ClientConfig("keyvalue"))

This function panics if the outboundKey is not known.

func (*Dispatcher) InboundMiddleware added in v1.8.0

func (d *Dispatcher) InboundMiddleware() InboundMiddleware

InboundMiddleware returns the middleware applied to all inbound handlers. Router middleware and fallback handlers can use the InboundMiddleware to wrap custom handlers.

func (*Dispatcher) Inbounds

func (d *Dispatcher) Inbounds() Inbounds

Inbounds returns a copy of the list of inbounds for this RPC object.

The Inbounds will be returned in the same order that was used in the configuration.

func (*Dispatcher) Introspect added in v1.5.0

func (d *Dispatcher) Introspect() introspection.DispatcherStatus

Introspect returns detailed information about the dispatcher. This function acquires a lots of locks throughout and should only be called with some reserve.

func (*Dispatcher) MustOutboundConfig added in v1.24.0

func (d *Dispatcher) MustOutboundConfig(outboundKey string) *transport.OutboundConfig

MustOutboundConfig provides the configuration needed to talk to the given service through an outboundKey. This configuration may be directly passed into encoding-specific RPC clients.

keyvalueClient := json.New(dispatcher.MustOutboundConfig("keyvalue"))

This function panics if the outboundKey is not known.

func (*Dispatcher) Name added in v1.5.0

func (d *Dispatcher) Name() string

Name returns the name of the dispatcher.

func (*Dispatcher) OutboundConfig added in v1.24.0

func (d *Dispatcher) OutboundConfig(outboundKey string) (oc *transport.OutboundConfig, ok bool)

OutboundConfig provides the configuration needed to talk to the given service through an outboundKey. This configuration may be directly passed into encoding-specific RPC clients.

 outboundConfig, ok := dispatcher.OutboundConfig("keyvalue")
 if !ok {
   // do something
 }
	keyvalueClient := json.New(outboundConfig)

func (*Dispatcher) Outbounds added in v1.31.0

func (d *Dispatcher) Outbounds() Outbounds

Outbounds returns a copy of the list of outbounds for this RPC object.

func (*Dispatcher) PhasedStart added in v1.29.0

func (d *Dispatcher) PhasedStart() (*PhasedStarter, error)

PhasedStart is a more granular alternative to Start, and is intended only for advanced users. Rather than starting all transports, inbounds, and outbounds at once, it lets the user start them separately.

Start and PhasedStart are mutually exclusive. If Start is called first, PhasedStart is a no-op and returns the same error (if any) that Start returned. If PhasedStart is called first, Start is a no-op and always returns a nil error; the caller is responsible for using the PhasedStarter to complete startup.

func (*Dispatcher) PhasedStop added in v1.29.0

func (d *Dispatcher) PhasedStop() (*PhasedStopper, error)

PhasedStop is a more granular alternative to Stop, and is intended only for advanced users. Rather than stopping all inbounds, outbounds, and transports at once, it lets the user stop them separately.

Stop and PhasedStop are mutually exclusive. If Stop is called first, PhasedStop is a no-op and returns the same error (if any) that Stop returned. If PhasedStop is called first, Stop is a no-op and always returns a nil error; the caller is responsible for using the PhasedStopper to complete shutdown.

func (*Dispatcher) Register added in v1.0.0

func (d *Dispatcher) Register(rs []transport.Procedure)

Register registers zero or more procedures with this dispatcher. Incoming requests to these procedures will be routed to the handlers specified in the given Procedures.

Example (JSON)
package main

import (
	"context"
	"fmt"

	"go.uber.org/yarpc"
	"go.uber.org/yarpc/encoding/json"
)

// global dispatcher used in the registration examples
var dispatcher = yarpc.NewDispatcher(yarpc.Config{Name: "service"})

type Request struct {
	key string
}

type Response struct {
	val string
}

func main() {
	handler := func(ctx context.Context, req *Request) (*Response, error) {
		fmt.Println("key", req.key)
		return &Response{val: "value"}, nil
	}

	dispatcher.Register(json.Procedure("get", handler))
}
Output:

Example (Raw)
package main

import (
	"context"

	"go.uber.org/yarpc"
	"go.uber.org/yarpc/encoding/raw"
)

// global dispatcher used in the registration examples
var dispatcher = yarpc.NewDispatcher(yarpc.Config{Name: "service"})

func main() {
	handler := func(ctx context.Context, data []byte) ([]byte, error) {
		return data, nil
	}

	dispatcher.Register(raw.Procedure("echo", handler))
}
Output:

func (*Dispatcher) Router added in v1.5.0

func (d *Dispatcher) Router() transport.Router

Router returns the procedure router.

func (*Dispatcher) Start

func (d *Dispatcher) Start() error

Start starts the Dispatcher, allowing it to accept and process new incoming requests. This starts all inbounds and outbounds configured on this Dispatcher.

This function returns immediately after everything has been started. Servers should add a `select {}` to block to process all incoming requests.

if err := dispatcher.Start(); err != nil {
	log.Fatal(err)
}
defer dispatcher.Stop()

select {}

Start and PhasedStart are mutually exclusive. See the PhasedStart documentation for details.

func (*Dispatcher) Stop

func (d *Dispatcher) Stop() error

Stop stops the Dispatcher, shutting down all inbounds, outbounds, and transports. This function returns after everything has been stopped.

Stop and PhasedStop are mutually exclusive. See the PhasedStop documentation for details.

type InboundMiddleware added in v1.0.0

type InboundMiddleware struct {
	Unary  middleware.UnaryInbound
	Oneway middleware.OnewayInbound
	Stream middleware.StreamInbound
}

InboundMiddleware contains the different types of inbound middlewares.

type Inbounds added in v0.5.0

type Inbounds []transport.Inbound

Inbounds contains a list of inbound transports. Each inbound transport specifies a source through which incoming requests are received.

type LogLevelConfig added in v1.36.0

type LogLevelConfig struct {
	// Level at which successful requests are logged.
	// Defaults to DebugLevel.
	// Can be overridden by Inbound.Success or Outbound.Success for inbound or
	// outbound requests.
	Success *zapcore.Level
	// Level at which errors are logged.
	// Thrift exceptions are application errors, which we log as a separate
	// class from success and failure.
	// Can be overridden by Inbound.Failure or Outbound.Failure for inbound or
	// outbound requests.
	// Deprecated in favor of ServerError and ClientError.
	Failure *zapcore.Level
	// Level at which application errors are logged.
	// All Thrift exceptions are considered application errors.
	// Defaults to ErrorLevel.
	// Can be overridden by Inbound.ApplicationError or
	// Outbound.ApplicationError for inbound or outbound requests.
	// Deprecated in favor of ServerError and ClientError.
	ApplicationError *zapcore.Level
	// Level at which client errors are logged.
	// All Thrift exceptions are considered application errors if
	// they are not annotated with the option rpc.code.
	// Defaults to ErrorLevel.
	// Can be overridden by Inbound.ApplicationError or
	// Outbound.ApplicationError for inbound or outbound requests.
	ClientError *zapcore.Level
	// Level at which server errors are logged.
	// Defaults to ErrorLevel.
	// Can be overridden by Inbound.ApplicationError or
	// Outbound.ApplicationError for inbound or outbound requests.
	ServerError *zapcore.Level
	// Specific overrides for inbound and outbound requests.
	Inbound, Outbound DirectionalLogLevelConfig
}

LogLevelConfig configures the levels at which YARPC logs various things.

type LoggingConfig added in v1.8.0

type LoggingConfig struct {
	// Supplies a logger for the dispatcher. By default, no logs are
	// emitted.
	Zap *zap.Logger

	// If supplied, ExtractContext is used to log request-scoped
	// information carried on the context (e.g., trace and span IDs).
	ContextExtractor func(context.Context) zapcore.Field

	// Levels configures the levels at which YARPC logs various messages.
	Levels LogLevelConfig
}

LoggingConfig describes how logging should be configured.

type MapRouter added in v1.0.0

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

MapRouter is a Router that maintains a map of the registered procedures.

func NewMapRouter added in v1.0.0

func NewMapRouter(defaultService string) MapRouter

NewMapRouter builds a new MapRouter that uses the given name as the default service name.

func (MapRouter) Choose added in v1.0.0

Choose retrives the HandlerSpec for the service, procedure, and encoding noted on the transport request, or returns an unrecognized procedure error (testable with transport.IsUnrecognizedProcedureError(err)).

func (MapRouter) Procedures added in v1.0.0

func (m MapRouter) Procedures() []transport.Procedure

Procedures returns a list procedures that have been registered so far.

func (MapRouter) Register added in v1.0.0

func (m MapRouter) Register(rs []transport.Procedure)

Register registers the procedure with the MapRouter. If the procedure does not specify its service name, the procedure will inherit the default service name of the router. Procedures should specify their encoding, and multiple procedures with the same name and service name can exist if they handle different encodings. If a procedure does not specify an encoding, it can only support one handler. The router will select that handler regardless of the encoding.

type MetricsConfig added in v1.8.0

type MetricsConfig struct {
	// Metrics is a *"go.uber.org/net/metrics".Scope for recording stats.
	// YARPC does not push these metrics; pushing metrics from the root is an
	// external concern.
	Metrics *metrics.Scope
	// Tally scope used for pushing to M3 or StatsD-based systems. By
	// default, metrics are collected in memory but not pushed.
	// TODO deprecate this option for metrics configuration.
	Tally tally.Scope
	// TagsBlocklist enlists tags' keys that should be suppressed from all the metrics
	// emitted from w/in YARPC middleware.
	TagsBlocklist []string
}

MetricsConfig describes how telemetry should be configured. Scope and Tally are exclusive; choose one. If neither is present, metrics are not recorded, all instrumentation becomes no-ops. If both are present, we emit a warning and ignore Tally. If a metrics scope is preseent, we use that scope to record metrics and they are not pushed to Tally. If Tally is present, we use its metrics scope and push them periodically.

type OutboundMiddleware added in v1.0.0

type OutboundMiddleware struct {
	Unary  middleware.UnaryOutbound
	Oneway middleware.OnewayOutbound
	Stream middleware.StreamOutbound
}

OutboundMiddleware contains the different types of outbound middlewares.

type Outbounds added in v0.4.0

type Outbounds map[string]transport.Outbounds

Outbounds provides access to outbounds for a remote service. Outbounds define how requests are sent from this service to the remote service.

type PhasedStarter added in v1.29.0

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

PhasedStarter is a more granular alternative to the Dispatcher's all-in-one Start method. Rather than starting the transports, inbounds, and outbounds in one call, it lets the user choose when to trigger each phase of dispatcher startup. For details on the interaction of Start and phased startup, see the documentation for the Dispatcher's PhasedStart method.

The user of a PhasedStarter is responsible for correctly ordering startup: transports MUST be started before outbounds, which MUST be started before inbounds. Attempting startup in any other order will return an error.

func (*PhasedStarter) StartInbounds added in v1.29.0

func (s *PhasedStarter) StartInbounds() error

StartInbounds is the final phase of startup. It starts all inbounds configured on the dispatcher, which allows any registered procedures to begin receiving requests. It's safe to call concurrently, but all calls after the first return an error.

func (*PhasedStarter) StartOutbounds added in v1.29.0

func (s *PhasedStarter) StartOutbounds() error

StartOutbounds is the second phase of startup. It starts all outbounds configured on the dispatcher, which allows users of the dispatcher to construct clients and begin making outbound RPCs. It's safe to call concurrently, but all calls after the first return an error.

func (*PhasedStarter) StartTransports added in v1.29.0

func (s *PhasedStarter) StartTransports() error

StartTransports is the first step in startup. It starts all transports configured on the dispatcher, which is a necessary precondition for making and receiving RPCs. It's safe to call concurrently, but all calls after the first return an error.

type PhasedStopper added in v1.29.0

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

PhasedStopper is a more granular alternative to the Dispatcher's all-in-one Stop method. Rather than stopping the inbounds, outbounds, and transports in one call, it lets the user choose when to trigger each phase of dispatcher shutdown. For details on the interaction of Stop and phased shutdown, see the documentation for the Dispatcher's PhasedStop method.

The user of a PhasedStopper is responsible for correctly ordering shutdown: inbounds MUST be stopped before outbounds, which MUST be stopped before transports. Attempting shutdown in any other order will return an error.

func (*PhasedStopper) StopInbounds added in v1.29.0

func (s *PhasedStopper) StopInbounds() error

StopInbounds is the first step in shutdown. It stops all inbounds configured on the dispatcher, which stops routing RPCs to all registered procedures. It's safe to call concurrently, but all calls after the first return an error.

func (*PhasedStopper) StopOutbounds added in v1.29.0

func (s *PhasedStopper) StopOutbounds() error

StopOutbounds is the second step in shutdown. It stops all outbounds configured on the dispatcher, which stops clients from making outbound RPCs. It's safe to call concurrently, but all calls after the first return an error.

func (*PhasedStopper) StopTransports added in v1.29.0

func (s *PhasedStopper) StopTransports() error

StopTransports is the final step in shutdown. It stops all transports configured on the dispatcher and cleans up any ancillary goroutines. It's safe to call concurrently, but all calls after the first return an error.

type RouterMiddleware added in v1.2.0

type RouterMiddleware middleware.Router

RouterMiddleware wraps the Router middleware

type StreamOption added in v1.27.0

type StreamOption encoding.StreamOption

StreamOption defines options that may be passed in at streaming function call sites.

These may be used to add or alter individual stream calls.

Directories

Path Synopsis
api
encoding
Package encoding provides APIs for encoding authors.
Package encoding provides APIs for encoding authors.
middleware/middlewaretest
Package middlewaretest is a generated GoMock package.
Package middlewaretest is a generated GoMock package.
peer
Package peer contains interfaces pertaining to peers, peer lists, peer list updaters, and generally how to choose a peer for an outbound request.
Package peer contains interfaces pertaining to peers, peer lists, peer list updaters, and generally how to choose a peer for an outbound request.
peer/peertest
Package peertest is a generated GoMock package.
Package peertest is a generated GoMock package.
transport/transporttest
Package transporttest is a generated GoMock package.
Package transporttest is a generated GoMock package.
x/restriction
Package restriction is an experimental package for preventing unwanted transport-encoding pairs.
Package restriction is an experimental package for preventing unwanted transport-encoding pairs.
compressor
grpc
Package yarpcgrpccompressor provides an adapter for YARPC compressors to gRPC compressors.
Package yarpcgrpccompressor provides an adapter for YARPC compressors to gRPC compressors.
gzip
Package yarpcgzip provides a YARPC binding for GZIP compression.
Package yarpcgzip provides a YARPC binding for GZIP compression.
snappy
Package yarpcsnappy provides a YARPC binding for snappy compression.
Package yarpcsnappy provides a YARPC binding for snappy compression.
encoding
json
Package json provides the JSON encoding for YARPC.
Package json provides the JSON encoding for YARPC.
protobuf
Package protobuf implements Protocol Buffers encoding support for YARPC.
Package protobuf implements Protocol Buffers encoding support for YARPC.
protobuf/protoc-gen-yarpc-go
Package main provides a protoc plugin that generates code for the protobuf encoding for YARPC.
Package main provides a protoc plugin that generates code for the protobuf encoding for YARPC.
protobuf/reflection
Package reflection exposes information about protobuf services required to implement the gRPC server reflection API and return information about the compatible registered yarpc services.
Package reflection exposes information about protobuf services required to implement the gRPC server reflection API and return information about the compatible registered yarpc services.
raw
Package raw provides the raw encoding for YARPC.
Package raw provides the raw encoding for YARPC.
thrift
Package thrift implements Thrift encoding support for YARPC.
Package thrift implements Thrift encoding support for YARPC.
thrift/thriftrw-plugin-yarpc
thriftrw-plugin-yarpc implements a plugin for ThriftRW that generates code compatible with YARPC.
thriftrw-plugin-yarpc implements a plugin for ThriftRW that generates code compatible with YARPC.
Package peer contains components for managing peers.
Package peer contains components for managing peers.
abstractlist
Package abstractlist provides a utility for managing peer availability with a separate implementation of peer selection from just among available peers.
Package abstractlist provides a utility for managing peer availability with a separate implementation of peer selection from just among available peers.
peerlist
Package peerlist is deprecated in favor of `go.uber.org/yarpc/peer/peerlist/v2` which can additionally convey peer list identifiers to the peerlist.Implementation without a wrapper type, allowing a peer list updater to communicate shard information for example.
Package peerlist is deprecated in favor of `go.uber.org/yarpc/peer/peerlist/v2` which can additionally convey peer list identifiers to the peerlist.Implementation without a wrapper type, allowing a peer list updater to communicate shard information for example.
peerlist/v2
Package peerlist provides a utility for managing peer availability with a separate implementation of peer selection from just among available peers.
Package peerlist provides a utility for managing peer availability with a separate implementation of peer selection from just among available peers.
pendingheap
Package pendingheap provides an implementation of a peer list that sends traffic to the peer with the fewest pending requests, but degenerates to round robin when all peers have equal pending requests, using a heap.
Package pendingheap provides an implementation of a peer list that sends traffic to the peer with the fewest pending requests, but degenerates to round robin when all peers have equal pending requests, using a heap.
tworandomchoices
Package tworandomchoices provides a load balancer implementation that picks two peers at random and chooses the one with fewer pending requests.
Package tworandomchoices provides a load balancer implementation that picks two peers at random and chooses the one with fewer pending requests.
x
Package x contains experimental components.
Package x contains experimental components.
pkg
encoding
Package encoding contains helper functionality for encoding implementations.
Package encoding contains helper functionality for encoding implementations.
errors
Package errors contains helper functions for working with YARPC errors for encoding and transport implementations.
Package errors contains helper functions for working with YARPC errors for encoding and transport implementations.
lifecycle
Package lifecycle provides a helper for objects that have a synchronized lifecycle from idle, through running, to stopped or errored, executing start and stop transitions exactly once.
Package lifecycle provides a helper for objects that have a synchronized lifecycle from idle, through running, to stopped or errored, executing start and stop transitions exactly once.
procedure
Package procedure contains utilities for handling procedure name mappings.
Package procedure contains utilities for handling procedure name mappings.
Package transport implements the low level concerns of sending and receiving bytes.
Package transport implements the low level concerns of sending and receiving bytes.
grpc
Package grpc implements a YARPC transport based on the gRPC protocol.
Package grpc implements a YARPC transport based on the gRPC protocol.
http
Package http implements a YARPC transport based on the HTTP/1.1 protocol.
Package http implements a YARPC transport based on the HTTP/1.1 protocol.
tchannel
Package tchannel implements a YARPC transport based on the TChannel protocol.
Package tchannel implements a YARPC transport based on the TChannel protocol.
x
Package x contains experimental components.
Package x contains experimental components.
yarpctest/api
Package api is for all interfaces and patterns that need to be implemented to interact with the yarpctest api, but not the explicit types we'll use to make requests, or the types that we'll use directly in tests.
Package api is for all interfaces and patterns that need to be implemented to interact with the yarpctest api, but not the explicit types we'll use to make requests, or the types that we'll use directly in tests.
yarpctest/types
Package types are for objects in the yarpctest API that implement multiple interfaces.
Package types are for objects in the yarpctest API that implement multiple interfaces.
Package yarpcconfig implements a generic configuration system that may be used to build YARPC Dispatchers from configurations specified in different markup formats.
Package yarpcconfig implements a generic configuration system that may be used to build YARPC Dispatchers from configurations specified in different markup formats.
Package yarpctest provides utilities to test YARPC services and clients.
Package yarpctest provides utilities to test YARPC services and clients.
recorder
Package recorder records & replay yarpc requests on the client side.
Package recorder records & replay yarpc requests on the client side.
bufferpool
Package bufferpool maintains a pool of bytes.Buffers for use in encoding and transport implementations.
Package bufferpool maintains a pool of bytes.Buffers for use in encoding and transport implementations.
cover
cover is a tool that runs `go test` with cross-package coverage on this repository, ignoring any packages that opt out of coverage with .nocover files.
cover is a tool that runs `go test` with cross-package coverage on this repository, ignoring any packages that opt out of coverage with .nocover files.
firstoutboundmiddleware
Package firstoutboundmiddleware annotates every outbound request with metadata like the request transport protocol.
Package firstoutboundmiddleware annotates every outbound request with metadata like the request transport protocol.
grpcctx
Package grpcctx contains helper functionality for testing with grpc-go.
Package grpcctx contains helper functionality for testing with grpc-go.
interpolate
Package interpolate provides a generic mechanism to interpolate variables into strings.
Package interpolate provides a generic mechanism to interpolate variables into strings.
net
observability
Package observability provides logging and metrics collection middleware for YARPC.
Package observability provides logging and metrics collection middleware for YARPC.
protoplugin
Package protoplugin provides utilities for protoc plugins.
Package protoplugin provides utilities for protoc plugins.
stresstest
Package main runs a stress test on each peer list implementation, concurrently adding, removing, connecting, disconnecting, and choosing peers.
Package main runs a stress test on each peer list implementation, concurrently adding, removing, connecting, disconnecting, and choosing peers.
testtime
Package testtime provides ways to scale time for tests running on CPU starved systems.
Package testtime provides ways to scale time for tests running on CPU starved systems.
crossdock Module
examples Module

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