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baz_simpleservice_method_headerschema.go
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baz_simpleservice_method_headerschema.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 bazendpoint
import (
"context"
"encoding/json"
"fmt"
"net/http"
"runtime/debug"
"time"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
zanzibar "github.com/uber/zanzibar/runtime"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
workflow "github.com/uber/zanzibar/examples/example-gateway/build/endpoints/baz/workflow"
endpointsIDlEndpointsBazBaz "github.com/uber/zanzibar/examples/example-gateway/build/gen-code/endpoints-idl/endpoints/baz/baz"
defaultExample "github.com/uber/zanzibar/examples/example-gateway/middlewares/default/default_example"
defaultExample2 "github.com/uber/zanzibar/examples/example-gateway/middlewares/default/default_example2"
module "github.com/uber/zanzibar/examples/example-gateway/build/endpoints/baz/module"
)
// SimpleServiceHeaderSchemaHandler is the handler for "/baz/header-schema"
type SimpleServiceHeaderSchemaHandler struct {
Dependencies *module.Dependencies
endpoint *zanzibar.RouterEndpoint
}
// NewSimpleServiceHeaderSchemaHandler creates a handler
func NewSimpleServiceHeaderSchemaHandler(deps *module.Dependencies) *SimpleServiceHeaderSchemaHandler {
handler := &SimpleServiceHeaderSchemaHandler{
Dependencies: deps,
}
handler.endpoint = zanzibar.NewRouterEndpoint(
deps.Default.ContextExtractor, deps.Default,
"baz", "headerSchema",
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 *SimpleServiceHeaderSchemaHandler) Register(g *zanzibar.Gateway) error {
return g.HTTPRouter.Handle(
"POST", "/baz/header-schema",
http.HandlerFunc(h.endpoint.HandleRequest),
)
}
// HandleRequest handles "/baz/header-schema".
func (h *SimpleServiceHeaderSchemaHandler) 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),
zap.String("endpoint", h.endpoint.EndpointName))
h.Dependencies.Default.ContextMetrics.IncCounter(ctx, zanzibar.MetricEndpointPanics, 1)
res.SendError(502, "Unexpected workflow panic, recovered at endpoint.", nil)
}
}()
if !req.CheckHeaders([]string{"Auth", "Content-Type"}) {
return ctx
}
var requestBody endpointsIDlEndpointsBazBaz.SimpleService_HeaderSchema_Args
if ok := req.ReadAndUnmarshalBody(&requestBody); !ok {
return ctx
}
// log endpoint request to downstream services
if ce := h.Dependencies.Default.ContextLogger.Check(zapcore.DebugLevel, "stub"); ce != nil {
zfields := []zapcore.Field{
zap.String("endpoint", h.endpoint.EndpointName),
}
zfields = append(zfields, zap.String("body", fmt.Sprintf("%s", req.GetRawBody())))
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.NewSimpleServiceHeaderSchemaWorkflow(h.Dependencies)
if span := req.GetSpan(); span != nil {
ctx = opentracing.ContextWithSpan(ctx, span)
}
ctx, response, cliRespHeaders, err := w.Handle(ctx, req.Header, &requestBody)
// log downstream response to endpoint
if ce := h.Dependencies.Default.ContextLogger.Check(zapcore.DebugLevel, "stub"); ce != nil {
zfields := []zapcore.Field{
zap.String("endpoint", h.endpoint.EndpointName),
}
if body, err := json.Marshal(response); err == nil {
zfields = append(zfields, zap.String("body", fmt.Sprintf("%s", body)))
}
if cliRespHeaders != nil {
for _, k := range cliRespHeaders.Keys() {
if val, ok := cliRespHeaders.Get(k); ok {
zfields = append(zfields, zap.String(k, val))
}
}
}
if traceKey, ok := req.Header.Get("x-trace-id"); ok {
zfields = append(zfields, zap.String("x-trace-id", traceKey))
}
ctx = h.Dependencies.Default.ContextLogger.DebugZ(ctx, "downstream service response", zfields...)
}
// 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 {
switch errValue := err.(type) {
case *endpointsIDlEndpointsBazBaz.AuthErr:
res.WriteJSON(
401, cliRespHeaders, errValue,
)
return ctx
case *endpointsIDlEndpointsBazBaz.OtherAuthErr:
res.WriteJSON(
403, cliRespHeaders, errValue,
)
return ctx
default:
res.SendError(500, "Unexpected server error", err)
return ctx
}
}
res.WriteJSON(200, cliRespHeaders, response)
return ctx
}