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server.go
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server.go
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package application
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"runtime"
"runtime/debug"
"sync"
"flamingo.me/flamingo/v3/framework/flamingo"
"flamingo.me/flamingo/v3/framework/systemendpoint/domain"
)
type (
// SystemServer provides the internal endpoint
SystemServer struct {
handlerProvider domain.HandlerProvider
logger flamingo.Logger
serviceAddress string
server *http.Server
mu sync.Mutex
}
)
// Inject dependencies
func (s *SystemServer) Inject(
handlerProvider domain.HandlerProvider,
logger flamingo.Logger,
config *struct {
ServiceAddress string `inject:"config:flamingo.systemendpoint.serviceAddr"`
},
) {
s.handlerProvider = handlerProvider
s.logger = logger
s.serviceAddress = config.ServiceAddress
}
// Notify handles required actions on Start and shutdown
func (s *SystemServer) Notify(_ context.Context, e flamingo.Event) {
switch e.(type) {
case *flamingo.ServerStartEvent:
s.Start()
case *flamingo.ServerShutdownEvent:
s.shutdown()
case *flamingo.ShutdownEvent:
s.shutdown()
}
}
// Start the systemendpoint in a separate go routine
func (s *SystemServer) Start() {
serveMux := http.NewServeMux()
for route, handler := range s.handlerProvider() {
if handler != nil {
s.logger.Debug("systemendpoint: register route ", route)
serveMux.Handle(route, handler)
}
}
serveMux.HandleFunc("/version", func(writer http.ResponseWriter, _ *http.Request) {
_, _ = fmt.Fprintf(writer, "version: %s\n", flamingo.AppVersion())
_, _ = fmt.Fprintf(writer, "go: %s\n", runtime.Version())
if info, ok := debug.ReadBuildInfo(); ok {
_, _ = fmt.Fprintf(writer, "path: %s\n", info.Path)
for _, module := range info.Deps {
if module.Path == "flamingo.me/flamingo/v3" {
_, _ = fmt.Fprintf(writer, "flamingo: %s\n", module.Version)
}
}
}
})
listener, err := net.Listen("tcp", s.serviceAddress)
if err != nil {
s.logger.Fatal(err)
}
s.mu.Lock()
s.server = &http.Server{Handler: serveMux}
s.mu.Unlock()
go func() {
s.logger.Info("Starting HTTP Server (systemendpoint) at ", listener.Addr())
err := s.server.Serve(listener)
if err != nil && !errors.Is(err, http.ErrServerClosed) {
panic(err)
}
}()
}
func (s *SystemServer) shutdown() {
s.mu.Lock()
defer s.mu.Unlock()
if s.server != nil {
s.logger.Info("systemendpoint: shutdown")
_ = s.server.Shutdown(context.Background())
s.server = nil
}
}