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dialer.go
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dialer.go
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// Copyright 2018 Istio 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 application
import (
"context"
"net/http"
"github.com/gorilla/websocket"
"google.golang.org/grpc"
)
var (
// DefaultGRPCDialFunc just calls grpc.Dial directly, with no alterations to the arguments.
DefaultGRPCDialFunc = func(ctx context.Context, address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
return grpc.DialContext(ctx, address, opts...)
}
// DefaultWebsocketDialFunc just calls dialer.Dial, with no alterations to the arguments.
DefaultWebsocketDialFunc = func(dialer *websocket.Dialer, urlStr string, requestHeader http.Header) (*websocket.Conn, *http.Response, error) {
return dialer.Dial(urlStr, requestHeader)
}
// DefaultHTTPDoFunc just calls client.Do with no alterations to the arguments.
DefaultHTTPDoFunc = func(client *http.Client, req *http.Request) (*http.Response, error) {
return client.Do(req)
}
// DefaultDialer is provides defaults for all dial functions.
DefaultDialer = Dialer{
GRPC: DefaultGRPCDialFunc,
Websocket: DefaultWebsocketDialFunc,
HTTP: DefaultHTTPDoFunc,
}
)
// GRPCDialFunc a function for establishing a GRPC connection.
type GRPCDialFunc func(ctx context.Context, address string, opts ...grpc.DialOption) (*grpc.ClientConn, error)
// WebsocketDialFunc a function for establishing a Websocket connection.
type WebsocketDialFunc func(dialer *websocket.Dialer, urlStr string, requestHeader http.Header) (*websocket.Conn, *http.Response, error)
// HTTPDoFunc a function for executing an HTTP request.
type HTTPDoFunc func(client *http.Client, req *http.Request) (*http.Response, error)
// Dialer is a replaceable set of functions for creating client-side connections for various protocols, allowing a test
// application to intercept the connection creation.
type Dialer struct {
GRPC GRPCDialFunc
Websocket WebsocketDialFunc
HTTP HTTPDoFunc
}
// Fill any missing dial functions with defaults
func (d Dialer) Fill() Dialer {
ret := DefaultDialer
if d.GRPC != nil {
ret.GRPC = d.GRPC
}
if d.Websocket != nil {
ret.Websocket = d.Websocket
}
if d.HTTP != nil {
ret.HTTP = d.HTTP
}
return ret
}