/
outbound.go
127 lines (110 loc) · 3.87 KB
/
outbound.go
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// Copyright (c) 2020 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 json
import (
"bytes"
"context"
"encoding/json"
"go.uber.org/yarpc"
encodingapi "go.uber.org/yarpc/api/encoding"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/pkg/encoding"
"go.uber.org/yarpc/pkg/errors"
)
// Client makes JSON requests to a single service.
type Client interface {
// Call performs an outbound JSON request.
//
// resBodyOut is a pointer to a value that can be filled with
// json.Unmarshal.
//
// Returns the response or an error if the request failed.
Call(ctx context.Context, procedure string, reqBody interface{}, resBodyOut interface{}, opts ...yarpc.CallOption) error
CallOneway(ctx context.Context, procedure string, reqBody interface{}, opts ...yarpc.CallOption) (transport.Ack, error)
}
// New builds a new JSON client.
func New(c transport.ClientConfig) Client {
return jsonClient{cc: c}
}
func init() {
yarpc.RegisterClientBuilder(New)
}
type jsonClient struct {
cc transport.ClientConfig
}
func (c jsonClient) Call(ctx context.Context, procedure string, reqBody interface{}, resBodyOut interface{}, opts ...yarpc.CallOption) error {
call := encodingapi.NewOutboundCall(encoding.FromOptions(opts)...)
treq := transport.Request{
Caller: c.cc.Caller(),
Service: c.cc.Service(),
Procedure: procedure,
Encoding: Encoding,
}
ctx, err := call.WriteToRequest(ctx, &treq)
if err != nil {
return err
}
encoded, err := json.Marshal(reqBody)
if err != nil {
return errors.RequestBodyEncodeError(&treq, err)
}
treq.Body = bytes.NewReader(encoded)
tres, appErr := c.cc.GetUnaryOutbound().Call(ctx, &treq)
if tres == nil {
return appErr
}
// we want to return the appErr if it exists as this is what
// the previous behavior was so we deprioritize this error
var decodeErr error
if _, err = call.ReadFromResponse(ctx, tres); err != nil {
decodeErr = err
}
if tres.Body != nil {
if err := json.NewDecoder(tres.Body).Decode(resBodyOut); err != nil && decodeErr == nil {
decodeErr = errors.ResponseBodyDecodeError(&treq, err)
}
if err := tres.Body.Close(); err != nil && decodeErr == nil {
decodeErr = err
}
}
if appErr != nil {
return appErr
}
return decodeErr
}
func (c jsonClient) CallOneway(ctx context.Context, procedure string, reqBody interface{}, opts ...yarpc.CallOption) (transport.Ack, error) {
call := encodingapi.NewOutboundCall(encoding.FromOptions(opts)...)
treq := transport.Request{
Caller: c.cc.Caller(),
Service: c.cc.Service(),
Procedure: procedure,
Encoding: Encoding,
}
ctx, err := call.WriteToRequest(ctx, &treq)
if err != nil {
return nil, err
}
var buff bytes.Buffer
if err := json.NewEncoder(&buff).Encode(reqBody); err != nil {
return nil, errors.RequestBodyEncodeError(&treq, err)
}
treq.Body = &buff
return c.cc.GetOnewayOutbound().CallOneway(ctx, &treq)
}