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good_client.go
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good_client.go
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/*
* Copyright 2019 The Knative Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kncloudevents
import (
nethttp "net/http"
cloudevents "github.com/cloudevents/sdk-go"
"github.com/cloudevents/sdk-go/pkg/cloudevents/client"
"github.com/cloudevents/sdk-go/pkg/cloudevents/transport/http"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/plugin/ochttp/propagation/b3"
"knative.dev/pkg/tracing"
)
// ConnectionArgs allow to configure connection parameters to the underlying
// HTTP Client transport.
type ConnectionArgs struct {
// MaxIdleConns refers to the max idle connections, as in net/http/transport.
MaxIdleConns int
// MaxIdleConnsPerHost refers to the max idle connections per host, as in net/http/transport.
MaxIdleConnsPerHost int
}
func NewDefaultClient(target ...string) (cloudevents.Client, error) {
tOpts := []http.Option{
cloudevents.WithBinaryEncoding(),
// Add input tracing.
http.WithMiddleware(tracing.HTTPSpanMiddleware),
}
if len(target) > 0 && target[0] != "" {
tOpts = append(tOpts, cloudevents.WithTarget(target[0]))
}
// Make an http transport for the CloudEvents client.
t, err := cloudevents.NewHTTPTransport(tOpts...)
if err != nil {
return nil, err
}
return NewDefaultClientGivenHttpTransport(t, nil)
}
// NewDefaultClientGivenHttpTransport creates a new CloudEvents client using the provided cloudevents HTTP
// transport. Note that it does modify the provided cloudevents HTTP Transport by adding tracing to its Client
// and different connection options, in case they are specified.
func NewDefaultClientGivenHttpTransport(t *cloudevents.HTTPTransport, connectionArgs *ConnectionArgs, opts ...client.Option) (cloudevents.Client, error) {
// Add connection options to the default transport.
var base = nethttp.DefaultTransport
if connectionArgs != nil {
baseTransport := base.(*nethttp.Transport)
baseTransport.MaxIdleConns = connectionArgs.MaxIdleConns
baseTransport.MaxIdleConnsPerHost = connectionArgs.MaxIdleConnsPerHost
}
// Add output tracing.
t.Client = &nethttp.Client{
Transport: &ochttp.Transport{
Base: base,
Propagation: &b3.HTTPFormat{},
},
}
if opts == nil {
opts = make([]client.Option, 0)
}
opts = append(opts, cloudevents.WithUUIDs(), cloudevents.WithTimeNow())
// Use the transport to make a new CloudEvents client.
c, err := cloudevents.NewClient(t, opts...)
if err != nil {
return nil, err
}
return c, nil
}