/
inbound.go
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/
inbound.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package http
import (
"net"
"net/http"
"strings"
"github.com/opentracing/opentracing-go"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/internal/introspection"
intnet "go.uber.org/yarpc/internal/net"
"go.uber.org/yarpc/pkg/lifecycle"
"go.uber.org/yarpc/yarpcerrors"
"go.uber.org/zap"
)
// InboundOption customizes the behavior of an HTTP Inbound constructed with
// NewInbound.
type InboundOption func(*Inbound)
func (InboundOption) httpOption() {}
// Mux specifies that the HTTP server should make the YARPC endpoint available
// under the given pattern on the given ServeMux. By default, the YARPC
// service is made available on all paths of the HTTP server. By specifying a
// ServeMux, users can narrow the endpoints under which the YARPC service is
// available and offer their own non-YARPC endpoints.
func Mux(pattern string, mux *http.ServeMux) InboundOption {
return func(i *Inbound) {
i.mux = mux
i.muxPattern = pattern
}
}
// Interceptor specifies a function which can wrap the YARPC handler. If
// provided, this function will be called with an http.Handler which will
// route requests through YARPC. The http.Handler returned by this function
// may delegate requests to the provided YARPC handler to route them through
// YARPC.
func Interceptor(interceptor func(yarpcHandler http.Handler) http.Handler) InboundOption {
return func(i *Inbound) {
i.interceptor = interceptor
}
}
// GrabHeaders specifies additional headers that are not prefixed with
// ApplicationHeaderPrefix that should be propagated to the caller.
//
// All headers given must begin with x- or X- or the Inbound that the
// returned option is passed to will return an error when Start is called.
//
// Headers specified with GrabHeaders are case-insensitive.
// https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
func GrabHeaders(headers ...string) InboundOption {
return func(i *Inbound) {
for _, header := range headers {
i.grabHeaders[strings.ToLower(header)] = struct{}{}
}
}
}
// NewInbound builds a new HTTP inbound that listens on the given address and
// sharing this transport.
func (t *Transport) NewInbound(addr string, opts ...InboundOption) *Inbound {
i := &Inbound{
once: lifecycle.NewOnce(),
addr: addr,
tracer: t.tracer,
logger: t.logger,
transport: t,
grabHeaders: make(map[string]struct{}),
bothResponseError: true,
}
for _, opt := range opts {
opt(i)
}
return i
}
// Inbound receives YARPC requests using an HTTP server. It may be constructed
// using the NewInbound method on the Transport.
type Inbound struct {
addr string
mux *http.ServeMux
muxPattern string
server *intnet.HTTPServer
router transport.Router
tracer opentracing.Tracer
logger *zap.Logger
transport *Transport
grabHeaders map[string]struct{}
interceptor func(http.Handler) http.Handler
once *lifecycle.Once
// should only be false in testing
bothResponseError bool
}
// Tracer configures a tracer on this inbound.
func (i *Inbound) Tracer(tracer opentracing.Tracer) *Inbound {
i.tracer = tracer
return i
}
// SetRouter configures a router to handle incoming requests.
// This satisfies the transport.Inbound interface, and would be called
// by a dispatcher when it starts.
func (i *Inbound) SetRouter(router transport.Router) {
i.router = router
}
// Transports returns the inbound's HTTP transport.
func (i *Inbound) Transports() []transport.Transport {
return []transport.Transport{i.transport}
}
// Start starts the inbound with a given service detail, opening a listening
// socket.
func (i *Inbound) Start() error {
return i.once.Start(i.start)
}
func (i *Inbound) start() error {
if i.router == nil {
return yarpcerrors.Newf(yarpcerrors.CodeInternal, "no router configured for transport inbound")
}
for header := range i.grabHeaders {
if !strings.HasPrefix(header, "x-") {
return yarpcerrors.Newf(yarpcerrors.CodeInvalidArgument, "header %s does not begin with 'x-'", header)
}
}
var httpHandler http.Handler = handler{
router: i.router,
tracer: i.tracer,
grabHeaders: i.grabHeaders,
bothResponseError: i.bothResponseError,
}
if i.interceptor != nil {
httpHandler = i.interceptor(httpHandler)
}
if i.mux != nil {
i.mux.Handle(i.muxPattern, httpHandler)
httpHandler = i.mux
}
i.server = intnet.NewHTTPServer(&http.Server{
Addr: i.addr,
Handler: httpHandler,
})
if err := i.server.ListenAndServe(); err != nil {
return err
}
i.addr = i.server.Listener().Addr().String() // in case it changed
i.logger.Info("started HTTP inbound", zap.String("address", i.addr))
if len(i.router.Procedures()) == 0 {
i.logger.Warn("no procedures specified for HTTP inbound")
}
return nil
}
// Stop the inbound, closing the listening socket.
func (i *Inbound) Stop() error {
return i.once.Stop(i.stop)
}
func (i *Inbound) stop() error {
if i.server == nil {
return nil
}
return i.server.Stop()
}
// IsRunning returns whether the inbound is currently running
func (i *Inbound) IsRunning() bool {
return i.once.IsRunning()
}
// Addr returns the address on which the server is listening. Returns nil if
// Start has not been called yet.
func (i *Inbound) Addr() net.Addr {
if i.server == nil {
return nil
}
listener := i.server.Listener()
if listener == nil {
return nil
}
return listener.Addr()
}
// Introspect returns the state of the inbound for introspection purposes.
func (i *Inbound) Introspect() introspection.InboundStatus {
state := "Stopped"
if i.IsRunning() {
state = "Started"
}
var addrString string
if addr := i.Addr(); addr != nil {
addrString = addr.String()
}
return introspection.InboundStatus{
Transport: "http",
Endpoint: addrString,
State: state,
}
}