Stanislav N. aka pztrn
dc1287dae8
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98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
package httpserver
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import (
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"context"
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"net"
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"net/http"
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"strings"
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"time"
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"go.dev.pztrn.name/metricator/internal/common"
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"go.dev.pztrn.name/metricator/internal/configuration"
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"go.dev.pztrn.name/metricator/internal/logger"
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)
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// HTTPServer is a controlling structure for HTTP server.
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type HTTPServer struct {
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config *configuration.Config
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ctx context.Context
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doneChan chan struct{}
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logger *logger.Logger
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handler *handler
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server *http.Server
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}
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// NewHTTPServer creates HTTP server and executes preliminary initialization
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// (HTTP server structure initialized but it doesn't start).
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func NewHTTPServer(ctx context.Context, cfg *configuration.Config, logger *logger.Logger) (*HTTPServer, chan struct{}) {
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// nolint:exhaustruct
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httpServer := &HTTPServer{
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config: cfg,
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ctx: ctx,
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doneChan: make(chan struct{}),
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logger: logger,
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}
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httpServer.initialize()
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return httpServer, httpServer.doneChan
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}
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// Returns request's context based on main context of application.
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// Basically it returns main context and does nothing more.
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func (h *HTTPServer) getRequestContext(_ net.Listener) context.Context {
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return h.ctx
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}
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// Initializes handler and HTTP server structure.
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func (h *HTTPServer) initialize() {
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h.logger.Debugln("Initializing HTTP server...")
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h.handler = &handler{
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handlers: make(map[string]common.HTTPHandlerFunc),
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}
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// We do not need to specify all possible parameters for HTTP server, so:
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// nolint:exhaustruct
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h.server = &http.Server{
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// ToDo: make it all configurable.
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Addr: ":34421",
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BaseContext: h.getRequestContext,
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Handler: h.handler,
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ReadTimeout: time.Second * 10,
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WriteTimeout: time.Second * 10,
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MaxHeaderBytes: 1 << 20,
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}
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}
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// RegisterHandlerForApplication registers HTTP handler for application.
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func (h *HTTPServer) RegisterHandlerForApplication(name string, handler common.HTTPHandlerFunc) {
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h.logger.Debugln("Registering handler for application", name)
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h.handler.register(name, handler)
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}
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// Start starts HTTP server in another goroutine and one more goroutine which
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// is listening to main context's Cancel() call to stop HTTP server.
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func (h *HTTPServer) Start() {
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go func() {
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err := h.server.ListenAndServe()
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if err != nil {
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if !strings.Contains(err.Error(), "Server closed") {
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h.logger.Infoln("HTTP server failed to listen:", err.Error())
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}
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}
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}()
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go func() {
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<-h.ctx.Done()
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h.logger.Infoln("Shutting down HTTP server")
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err := h.server.Shutdown(h.ctx)
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if err != nil && !strings.Contains(err.Error(), "context canceled") {
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h.logger.Infoln("Failed to stop HTTP server:", err.Error())
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}
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h.logger.Infoln("HTTP server stopped")
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h.doneChan <- struct{}{}
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}()
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}
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