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[0.17] Update eventing to latest (#1657)
Signed-off-by: Pierangelo Di Pilato <pierangelodipilato@gmail.com>
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106 changes: 106 additions & 0 deletions
106
vendor/knative.dev/eventing/pkg/kncloudevents/http_client.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /* | ||
| Copyright 2020 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" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "go.opencensus.io/plugin/ochttp" | ||
| "knative.dev/pkg/tracing/propagation/tracecontextb3" | ||
| ) | ||
|
|
||
| const ( | ||
| defaultRetryWaitMin = 1 * time.Second | ||
| defaultRetryWaitMax = 30 * time.Second | ||
| ) | ||
|
|
||
| type holder struct { | ||
| clientMutex sync.Mutex | ||
| connectionArgs *ConnectionArgs | ||
| client **nethttp.Client | ||
| } | ||
|
|
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| var clientHolder = holder{} | ||
|
|
||
| // The used HTTP client is a singleton, so the same http client is reused across all the application. | ||
| // If connection args is modified, client is cleaned and a new one is created. | ||
| func getClient() *nethttp.Client { | ||
| clientHolder.clientMutex.Lock() | ||
| defer clientHolder.clientMutex.Unlock() | ||
|
|
||
| if clientHolder.client == nil { | ||
| // Add connection options to the default transport. | ||
| var base = nethttp.DefaultTransport.(*nethttp.Transport).Clone() | ||
| clientHolder.connectionArgs.configureTransport(base) | ||
| c := &nethttp.Client{ | ||
| // Add output tracing. | ||
| Transport: &ochttp.Transport{ | ||
| Base: base, | ||
| Propagation: tracecontextb3.TraceContextEgress, | ||
| }, | ||
| } | ||
| clientHolder.client = &c | ||
| } | ||
|
|
||
| return *clientHolder.client | ||
| } | ||
|
|
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| // ConfigureConnectionArgs configures the new connection args. | ||
| // The existing client won't be affected, but a new one will be created. | ||
| // Use sparingly, because it might lead to creating a lot of clients, none of them sharing their connection pool! | ||
| func ConfigureConnectionArgs(ca *ConnectionArgs) { | ||
| clientHolder.clientMutex.Lock() | ||
| defer clientHolder.clientMutex.Unlock() | ||
|
|
||
| // Check if same config | ||
| if clientHolder.connectionArgs != nil && | ||
| ca != nil && | ||
| ca.MaxIdleConns == clientHolder.connectionArgs.MaxIdleConns && | ||
| ca.MaxIdleConnsPerHost == clientHolder.connectionArgs.MaxIdleConnsPerHost { | ||
| return | ||
| } | ||
|
|
||
| if clientHolder.client != nil { | ||
| // Let's try to clean up a bit the existing client | ||
| // Note: this won't remove it nor close it | ||
| (*clientHolder.client).CloseIdleConnections() | ||
|
|
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| // Setting client to nil | ||
| clientHolder.client = nil | ||
| } | ||
|
|
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| clientHolder.connectionArgs = ca | ||
| } | ||
|
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| // 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 | ||
| } | ||
|
|
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| func (ca *ConnectionArgs) configureTransport(transport *nethttp.Transport) { | ||
| if ca == nil { | ||
| return | ||
| } | ||
| transport.MaxIdleConns = ca.MaxIdleConns | ||
| transport.MaxIdleConnsPerHost = ca.MaxIdleConnsPerHost | ||
| } |
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