/
client.go
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/
client.go
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// Copyright (c) 2017 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 client
import (
"net/http"
"time"
"go.uber.org/fx/auth"
)
// New creates an http.Client that includes 2 extra outbound middleware: tracing and auth
// they are going to be applied in following order: tracing, auth, remaining outbound middleware
// and only if all of them passed the request is going to be send.
// Client is safe to use by multiple go routines, if global tracer is not changed.
func New(info auth.CreateAuthInfo, middleware ...OutboundMiddleware) *http.Client {
defaultMiddleware := []OutboundMiddleware{tracingOutbound(), authenticationOutbound(info)}
defaultMiddleware = append(defaultMiddleware, middleware...)
return &http.Client{
Transport: newExecutionChain(defaultMiddleware, http.DefaultTransport),
Timeout: 2 * time.Minute,
}
}
// executionChain represents a chain of outbound middleware that are being executed recursively
// in the increasing order middleware[0], middleware[1], ... The final transport is called
// to make RoundTrip after the last middleware is completed.
type executionChain struct {
currentMiddleware int
middleware []OutboundMiddleware
finalTransport http.RoundTripper
}
func newExecutionChain(
middleware []OutboundMiddleware, finalTransport http.RoundTripper,
) executionChain {
return executionChain{
middleware: middleware,
finalTransport: finalTransport,
}
}
func (ec executionChain) Execute(r *http.Request) (resp *http.Response, err error) {
if ec.currentMiddleware < len(ec.middleware) {
middleware := ec.middleware[ec.currentMiddleware]
ec.currentMiddleware++
return middleware.Handle(r, ec)
}
return ec.finalTransport.RoundTrip(r)
}
// Implement http.RoundTripper interface to use as a Transport in http.Client
func (ec executionChain) RoundTrip(r *http.Request) (resp *http.Response, err error) {
return ec.Execute(r)
}