/
json.go
65 lines (56 loc) · 2.29 KB
/
json.go
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// Copyright (c) 2016 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 trace
import (
"github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/crossdock/log"
"github.com/uber/tchannel-go/json"
"golang.org/x/net/context"
)
const jsonEndpoint = "trace"
func (b *Behavior) registerJSON(ch *tchannel.Channel) {
handler := &jsonHandler{b: b, ch: ch}
json.Register(ch, json.Handlers{jsonEndpoint: handler.handleJSON}, handler.onError)
b.jsonCall = handler.callDownstream
}
type jsonHandler struct {
ch *tchannel.Channel
b *Behavior
}
func (h *jsonHandler) callDownstream(ctx context.Context, target *Downstream) (*Response, error) {
req := &Request{
ServerRole: target.ServerRole,
Downstream: target.Downstream,
}
jctx := json.Wrap(ctx)
response := new(Response)
log.Printf("Calling JSON service %s (%s)", target.ServiceName, target.HostPort)
peer := h.ch.Peers().GetOrAdd(target.HostPort)
if err := json.CallPeer(jctx, peer, target.ServiceName, jsonEndpoint, req, response); err != nil {
return nil, err
}
return response, nil
}
func (h *jsonHandler) handleJSON(ctx json.Context, req *Request) (*Response, error) {
return h.b.prepareResponse(ctx, nil, req.Downstream)
}
func (h *jsonHandler) onError(ctx context.Context, err error) {
panic(err.Error())
}