/
main.go
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/
main.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 main
import (
"bytes"
"context"
"flag"
"strings"
"github.com/uber/zanzibar/config"
"github.com/pkg/errors"
_ "go.uber.org/automaxprocs"
"go.uber.org/fx"
"go.uber.org/zap"
zanzibar "github.com/uber/zanzibar/runtime"
app "github.com/uber/zanzibar/examples/example-gateway"
service "github.com/uber/zanzibar/examples/example-gateway/build/services/echo-gateway"
uberconfig "go.uber.org/config"
)
var configFiles *string
// Module defines the Zanzibar application module for Echo-gateway
var Module = fx.Options(
fx.Provide(New),
fx.Invoke(run),
)
func opts() fx.Option {
return fx.Options(
append(
[]fx.Option{Module},
app.GetOverrideFxOptions()...,
)...,
)
}
// Params defines the dependencies of the New module.
type Params struct {
fx.In
Lifecycle fx.Lifecycle
}
// Result defines the objects that the New module provides
type Result struct {
fx.Out
// Gateway corresponds to the fully built server gateway
Gateway *zanzibar.Gateway
// Provider is an abstraction over the Zanzibar config store
Provider uberconfig.Provider `name:"zanzibarConfig"`
}
func main() {
fx.New(opts()).Run()
}
// run is the main entry point for Echo-gateway
func run(gateway *zanzibar.Gateway) {
gateway.Logger.Info("Started Echo-gateway",
zap.String("realHTTPAddr", gateway.RealHTTPAddr),
zap.String("realTChannelAddr", gateway.RealTChannelAddr),
zap.Any("config", gateway.InspectOrDie()),
)
}
// New exports functionality similar to Module, but allows the caller to wrap
// or modify Result. Most users should use Module instead.
func New(p Params) (Result, error) {
readFlags()
gateway, err := createGateway()
if err != nil {
return Result{}, errors.Wrap(err, "failed to create gateway server")
}
// Represent the zanzibar config in YAML that will be used to expose a config provider
yamlCfg, err := gateway.Config.AsYaml()
if err != nil {
return Result{}, errors.Wrap(err, "unable to marshal Zanzibar config to YAML")
}
provider, err := uberconfig.NewYAML(
[]uberconfig.YAMLOption{
uberconfig.Source(bytes.NewReader(yamlCfg)),
}...,
)
if err != nil {
return Result{}, errors.Wrap(err, "unable to provide a YAML view from Zanzibar config")
}
p.Lifecycle.Append(fx.Hook{
OnStart: func(ctx context.Context) error {
err = gateway.Bootstrap()
if err != nil {
panic(errors.Wrap(err, "failed to bootstrap gateway server"))
}
return nil
},
OnStop: func(ctx context.Context) error {
gateway.Logger.Info("fx OnStop() hook activated")
gateway.WaitGroup.Add(1)
gateway.Shutdown()
gateway.WaitGroup.Done()
return nil
},
})
return Result{
Gateway: gateway,
Provider: provider,
}, nil
}
func createGateway() (*zanzibar.Gateway, error) {
cfg := getConfig()
gateway, _, err := service.CreateGateway(cfg, app.AppOptions)
if err != nil {
return nil, err
}
return gateway, nil
}
func getConfig() *zanzibar.StaticConfig {
var files []string
if configFiles == nil {
files = []string{}
} else {
files = strings.Split(*configFiles, ";")
}
return config.NewRuntimeConfigOrDie(files, nil)
}
func readFlags() {
configFiles = flag.String(
"config",
"",
"an ordered, semi-colon separated list of configuration files to use",
)
flag.Parse()
}