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baz_call.go
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baz_call.go
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// Copyright (c) 2018 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 bazhandler
import (
"context"
"github.com/uber/zanzibar/examples/example-gateway/build/endpoints/tchannel/baz/module"
"github.com/uber/zanzibar/examples/example-gateway/build/endpoints/tchannel/baz/workflow"
clientBaz "github.com/uber/zanzibar/examples/example-gateway/build/gen-code/clients/baz/baz"
endpointBaz "github.com/uber/zanzibar/examples/example-gateway/build/gen-code/endpoints/tchannel/baz/baz"
"github.com/uber/zanzibar/runtime"
"go.uber.org/zap"
)
// NewSimpleServiceCallWorkflow ...
func NewSimpleServiceCallWorkflow(
deps *module.Dependencies,
) workflow.SimpleServiceCallWorkflow {
return &Workflow{
Clients: deps.Client,
Logger: deps.Default.Logger,
contextLogger: deps.Default.ContextLogger,
}
}
// Workflow ...
type Workflow struct {
Clients *module.ClientDependencies
Logger *zap.Logger
contextLogger zanzibar.ContextLogger
}
// Handle ...
func (w Workflow) Handle(
ctx context.Context,
reqHeaders zanzibar.Header,
req *endpointBaz.SimpleService_Call_Args,
) (zanzibar.Header, error) {
clientReqHeaders := make(map[string]string)
// passing endpoint reqHeaders to downstream client
for _, k := range reqHeaders.Keys() {
if v, ok := reqHeaders.Get(k); ok {
clientReqHeaders[k] = v
}
}
clientReq := &clientBaz.SimpleService_Call_Args{
Arg: (*clientBaz.BazRequest)(req.Arg),
}
clientRespHeaders, err := w.Clients.Baz.Call(ctx, clientReqHeaders, clientReq)
respHeaders := zanzibar.ServerTChannelHeader(clientRespHeaders)
if err != nil {
switch v := err.(type) {
case *clientBaz.AuthErr:
return respHeaders, (*endpointBaz.AuthErr)(v)
default:
return respHeaders, err
}
}
if val, ok := clientReqHeaders["x-nil-response-header"]; ok {
if "true" == val {
return nil, nil
}
}
return respHeaders, nil
}