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main.go
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main.go
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/**
* @license
* Copyright 2017 Telefónica Investigación y Desarrollo, S.A.U
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"encoding/json"
"flag"
"net/http"
"os"
"time"
"github.com/Telefonica/govice"
"github.com/gorilla/mux"
)
type config struct {
Address string `json:"address" env:"ADDRESS"`
BasePath string `json:"basePath" env:"BASE_PATH"`
LogLevel string `json:"logLevel" env:"LOG_LEVEL"`
}
func withMws(op string) func(http.HandlerFunc) http.HandlerFunc {
ctxt := &govice.LogContext{
Service: "demo",
Operation: op,
}
return func(next http.HandlerFunc) http.HandlerFunc {
return govice.WithLogContext(ctxt)(govice.WithLog(next))
}
}
func main() {
// Prepare logger
time.Local = time.UTC
logContext := govice.LogContext{
Service: "demo",
Operation: "init",
}
logger := govice.NewLogger()
logger.SetLogContext(&logContext)
alarmContext := &govice.LogContext{Alarm: "ALARM_INIT"}
// Prepare the configuration
cfgFile := flag.String("config", "./config.json", "path to config file")
flag.Parse()
var cfg config
if err := govice.GetConfig(*cfgFile, &cfg); err != nil {
logger.FatalC(alarmContext, "Bad configuration with file '%s'. %s", *cfgFile, err)
os.Exit(1)
}
logger.SetLevel(cfg.LogLevel)
govice.SetDefaultLogLevel(cfg.LogLevel)
// Log the configuration
if configBytes, err := json.Marshal(cfg); err == nil {
logger.Info("Configuration: %s", string(configBytes))
}
// Create the validator and validate the configuration
validator := govice.NewValidator()
if err := validator.LoadSchemas("schemas"); err != nil {
logger.FatalC(alarmContext, "Error loading JSON schemas for validator. %s", err)
os.Exit(1)
}
if err := validator.ValidateConfig("config", &cfg); err != nil {
logger.FatalC(alarmContext, "Bad configuration according to JSON schema. %s", err)
os.Exit(1)
}
// Create the logic of the service
u := NewUsersService(validator)
// Create the router (based on mux)
r := mux.NewRouter()
r.HandleFunc("/users", withMws("createUser")(u.CreateUser)).Methods("POST")
r.HandleFunc("/users/{login}", withMws("getUser")(u.GetUser)).Methods("GET")
r.HandleFunc("/users/{login}", withMws("deleteUser")(u.DeleteUser)).Methods("DELETE")
// Launch the HTTP server
s := &http.Server{Addr: cfg.Address, Handler: r}
if err := s.ListenAndServe(); err != nil {
logger.FatalC(alarmContext, "Error launching the server. %s", err)
os.Exit(1)
}
}