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multi_serviceafront_method_hello.go
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multi_serviceafront_method_hello.go
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// Code generated by zanzibar
// @generated
// 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 multiendpoint
import (
"context"
"encoding/json"
"net/http"
"runtime/debug"
"time"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
zanzibar "github.com/uber/zanzibar/v2/runtime"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
workflow "github.com/uber/zanzibar/v2/examples/example-gateway/build/endpoints/multi/workflow"
defaultExample "github.com/uber/zanzibar/v2/examples/example-gateway/middlewares/default/default_example"
defaultExample2 "github.com/uber/zanzibar/v2/examples/example-gateway/middlewares/default/default_example2"
module "github.com/uber/zanzibar/v2/examples/example-gateway/build/endpoints/multi/module"
)
// ServiceAFrontHelloHandler is the handler for "/multi/serviceA_f/hello"
type ServiceAFrontHelloHandler struct {
Dependencies *module.Dependencies
endpoint *zanzibar.RouterEndpoint
}
// NewServiceAFrontHelloHandler creates a handler
func NewServiceAFrontHelloHandler(deps *module.Dependencies) *ServiceAFrontHelloHandler {
handler := &ServiceAFrontHelloHandler{
Dependencies: deps,
}
handler.endpoint = zanzibar.NewRouterEndpoint(
deps.Default.ContextExtractor, deps.Default,
"multi", "helloA",
zanzibar.NewStack([]zanzibar.MiddlewareHandle{
deps.Middleware.DefaultExample2.NewMiddlewareHandle(
defaultExample2.Options{},
),
deps.Middleware.DefaultExample.NewMiddlewareHandle(
defaultExample.Options{},
),
}, handler.HandleRequest).Handle,
)
return handler
}
// Register adds the http handler to the gateway's http router
func (h *ServiceAFrontHelloHandler) Register(g *zanzibar.Gateway) error {
return g.HTTPRouter.Handle(
"GET", "/multi/serviceA_f/hello",
http.HandlerFunc(h.endpoint.HandleRequest),
)
}
// HandleRequest handles "/multi/serviceA_f/hello".
func (h *ServiceAFrontHelloHandler) HandleRequest(
ctx context.Context,
req *zanzibar.ServerHTTPRequest,
res *zanzibar.ServerHTTPResponse,
) context.Context {
defer func() {
if r := recover(); r != nil {
stacktrace := string(debug.Stack())
e := errors.Errorf("enpoint panic: %v, stacktrace: %v", r, stacktrace)
ctx = h.Dependencies.Default.ContextLogger.ErrorZ(
ctx,
"Endpoint failure: endpoint panic",
zap.Error(e),
zap.String("stacktrace", stacktrace))
h.Dependencies.Default.ContextMetrics.IncCounter(ctx, zanzibar.MetricEndpointPanics, 1)
res.SendError(502, "Unexpected workflow panic, recovered at endpoint.", nil)
}
}()
// log endpoint request to downstream services
if ce := h.Dependencies.Default.ContextLogger.Check(zapcore.DebugLevel, "stub"); ce != nil {
var zfields []zapcore.Field
for _, k := range req.Header.Keys() {
if val, ok := req.Header.Get(k); ok {
zfields = append(zfields, zap.String(k, val))
}
}
ctx = h.Dependencies.Default.ContextLogger.DebugZ(ctx, "endpoint request to downstream", zfields...)
}
w := workflow.NewServiceAFrontHelloWorkflow(h.Dependencies)
if span := req.GetSpan(); span != nil {
ctx = opentracing.ContextWithSpan(ctx, span)
}
ctx, response, cliRespHeaders, err := w.Handle(ctx, req.Header)
// map useful client response headers to server response
if cliRespHeaders != nil {
if val, ok := cliRespHeaders.Get(zanzibar.ClientResponseDurationKey); ok {
if duration, err := time.ParseDuration(val); err == nil {
res.DownstreamFinishTime = duration
}
cliRespHeaders.Unset(zanzibar.ClientResponseDurationKey)
}
if val, ok := cliRespHeaders.Get(zanzibar.ClientTypeKey); ok {
res.ClientType = val
cliRespHeaders.Unset(zanzibar.ClientTypeKey)
}
}
if err != nil {
res.SendError(500, "Unexpected server error", err)
return ctx
}
bytes, err := json.Marshal(response)
if err != nil {
res.SendError(500, "Unexpected server error", errors.Wrap(err, "Unable to marshal resp json"))
return ctx
}
res.WriteJSONBytes(200, cliRespHeaders, bytes)
return ctx
}