/
server.go
152 lines (133 loc) · 3.79 KB
/
server.go
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// Contains server definition and miscellaneous middleware and helper functions
package api
import (
"fmt"
"log"
"net/http"
"sync"
"github.com/gorilla/mux"
"github.com/joeshaw/envdecode"
"go.uber.org/zap"
"google.golang.org/grpc"
alert "github.com/shaardie/mondane/alert/proto"
checkmanager "github.com/shaardie/mondane/checkmanager/proto"
mail "github.com/shaardie/mondane/mail/proto"
userService "github.com/shaardie/mondane/user/proto"
)
const (
notProperJSON = "not proper json" // Response to user for broken json
)
type responseError struct {
Error string `json:"error"`
}
// Config read from environment
type config struct {
Listen string `env:"MONDANE_API_LISTEN,default=:8080"`
User string `env:"MONDANE_API_USER_SERVER,required"`
Mail string `env:"MONDANE_API_MAIL_SERVER,required"`
Alert string `env:"MONDANE_API_ALERT_SERVER,required"`
CheckManager string `env:"MONDANE_API_CHECKMANAGER_SERVER,required"`
}
// Server from which all handler and handler functions are hanging and
// where global resources are saved.
// It is the core structure for the API.
type server struct {
srv *http.Server
router *mux.Router
config *config
logger *zap.SugaredLogger
initOnce sync.Once
user userService.UserServiceClient
mail mail.MailServiceClient
checkmanager checkmanager.CheckManagerServiceClient
alert alert.AlertServiceClient
}
// initHandler initialize resources lazy on first request
func (s *server) initHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Do once
s.initOnce.Do(func() {
// Connect to mail grpc
if s.mail == nil {
d, err := grpc.Dial(s.config.Mail, grpc.WithInsecure())
if err != nil {
s.logger.Errorf("unable to connect ot mail service",
"error", err)
s.srv.Close()
return
}
s.mail = mail.NewMailServiceClient(d)
s.logger.Info("Connected to mail server")
}
// Connect to user grpc
if s.user == nil {
d, err := grpc.Dial(s.config.User, grpc.WithInsecure())
if err != nil {
s.logger.Errorf("unable to connect ot user service",
"error", err)
s.srv.Close()
return
}
s.user = userService.NewUserServiceClient(d)
s.logger.Info("Connected to user server")
}
// Connect to alert grpc
if s.alert == nil {
d, err := grpc.Dial(s.config.Alert, grpc.WithInsecure())
if err != nil {
s.logger.Errorf("unable to connect ot alert service",
"error", err)
s.srv.Close()
return
}
s.alert = alert.NewAlertServiceClient(d)
s.logger.Info("Connected to alert server")
}
// Connect to checkmanager grpc
if s.mail == nil {
d, err := grpc.Dial(s.config.CheckManager, grpc.WithInsecure())
if err != nil {
s.logger.Errorf("unable to connect ot checkmanager service",
"error", err)
s.srv.Close()
return
}
s.checkmanager = checkmanager.NewCheckManagerServiceClient(d)
s.logger.Info("Connected to checkmanager server")
}
})
// Call next handler function
h.ServeHTTP(w, r)
})
}
// Run runs the server
func Run() error {
baseLogger, err := zap.NewProduction()
if err != nil {
log.Printf("Unable to initialize logger, %v", err)
return err
}
logger := baseLogger.Sugar()
logger.Info("Initialized logger")
// Get Config
var c config
if err := envdecode.StrictDecode(&c); err != nil {
logger.Infow("Unable to read config",
"error", err)
return fmt.Errorf("unable to read config, %w", err)
}
// Create server
s := server{
config: &c,
srv: &http.Server{Addr: c.Listen},
logger: logger,
}
// Setup routes
s.routes()
// Run Server
if err := s.srv.ListenAndServe(); err != nil {
s.logger.Errorw("Server stopped", "error", err)
return err
}
return nil
}