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outbound.go
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outbound.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 protobuf
import (
"bytes"
"context"
"github.com/gogo/protobuf/proto"
"go.uber.org/yarpc"
apiencoding "go.uber.org/yarpc/api/encoding"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/pkg/encoding"
"go.uber.org/yarpc/pkg/errors"
"go.uber.org/yarpc/pkg/procedure"
"go.uber.org/yarpc/yarpcerrors"
)
type client struct {
serviceName string
clientConfig transport.ClientConfig
encoding transport.Encoding
}
func newClient(serviceName string, clientConfig transport.ClientConfig, options ...ClientOption) *client {
client := &client{
serviceName: serviceName,
clientConfig: clientConfig,
encoding: Encoding,
}
for _, option := range options {
option.apply(client)
}
return client
}
func (c *client) Call(
ctx context.Context,
requestMethodName string,
request proto.Message,
newResponse func() proto.Message,
options ...yarpc.CallOption,
) (proto.Message, error) {
ctx, call, transportRequest, cleanup, err := c.buildTransportRequest(ctx, requestMethodName, request, options)
if cleanup != nil {
defer cleanup()
}
if err != nil {
return nil, err
}
transportResponse, appErr := c.clientConfig.GetUnaryOutbound().Call(ctx, transportRequest)
if transportResponse == nil {
return nil, appErr
}
if transportResponse.Body != nil {
// thrift is not checking the error, should be consistent
defer transportResponse.Body.Close()
}
if _, err := call.ReadFromResponse(ctx, transportResponse); err != nil {
return nil, err
}
var response proto.Message
if transportResponse.Body != nil {
response = newResponse()
if err := unmarshal(transportRequest.Encoding, transportResponse.Body, response); err != nil {
return nil, errors.ResponseBodyDecodeError(transportRequest, err)
}
}
return response, appErr
}
func (c *client) CallOneway(
ctx context.Context,
requestMethodName string,
request proto.Message,
options ...yarpc.CallOption,
) (transport.Ack, error) {
ctx, _, transportRequest, cleanup, err := c.buildTransportRequest(ctx, requestMethodName, request, options)
if cleanup != nil {
defer cleanup()
}
if err != nil {
return nil, err
}
return c.clientConfig.GetOnewayOutbound().CallOneway(ctx, transportRequest)
}
func (c *client) buildTransportRequest(ctx context.Context, requestMethodName string, request proto.Message, options []yarpc.CallOption) (context.Context, *apiencoding.OutboundCall, *transport.Request, func(), error) {
transportRequest := &transport.Request{
Caller: c.clientConfig.Caller(),
Service: c.clientConfig.Service(),
Procedure: procedure.ToName(c.serviceName, requestMethodName),
Encoding: c.encoding,
}
call := apiencoding.NewOutboundCall(encoding.FromOptions(options)...)
ctx, err := call.WriteToRequest(ctx, transportRequest)
if err != nil {
return nil, nil, nil, nil, err
}
if transportRequest.Encoding != Encoding && transportRequest.Encoding != JSONEncoding {
return nil, nil, nil, nil, yarpcerrors.Newf(yarpcerrors.CodeInternal, "can only use encodings %q or %q, but %q was specified", Encoding, JSONEncoding, transportRequest.Encoding)
}
if request != nil {
requestData, cleanup, err := marshal(transportRequest.Encoding, request)
if err != nil {
return nil, nil, nil, cleanup, errors.RequestBodyEncodeError(transportRequest, err)
}
if requestData != nil {
transportRequest.Body = bytes.NewReader(requestData)
}
return ctx, call, transportRequest, cleanup, nil
}
return ctx, call, transportRequest, nil, nil
}