100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package sww
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import (
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"context"
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"errors"
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"log/slog"
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"net"
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"net/http"
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"os"
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"sneak.berlin/go/smallwebwaf/internal/config"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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"sneak.berlin/go/smallwebwaf/internal/rproxy"
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)
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// RunRProxy is `sww rproxy`: it reads rproxy's settings, then serves
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// requests until ctx is done. Then it gives the requests in progress
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// shutdownTimeout to finish, and the reports being sent SWRP_TIMEOUT_MS. It
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// returns the process's exit status, 1 when rproxy cannot start. Its process
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// messages name the host's name as instance, and it writes those at info or
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// more severe: rproxy has no setting for either.
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func RunRProxy(ctx context.Context, params Params) int {
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hostname, _ := os.Hostname() // "" when the host has no name to give
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processLog := requestlog.NewProcessLogger(params.Stdout, hostname, slog.LevelInfo)
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cfg, err := config.RProxyFromEnvironment(params.LookupEnv)
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if err != nil {
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processLog.Error("invalid setting", "error", err.Error())
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return 1
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}
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server := rproxy.New(rproxy.Params{
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Config: cfg,
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RequestLog: params.Stdout,
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ProcessLog: processLog,
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})
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listener, err := (&net.ListenConfig{}).Listen(ctx, "tcp", cfg.ListenAddr)
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if err != nil {
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processLog.Error("cannot listen on SWRP_LISTEN_ADDR", "error", err.Error())
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return 1
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}
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processLog.Info("starting",
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"version", params.Version,
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"address", listener.Addr().String(),
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"settings", cfg)
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return serveRProxy(ctx, server, listener, processLog)
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}
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// serveRProxy serves requests on listener until ctx is done, and then stops as
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// RunRProxy says.
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func serveRProxy(
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ctx context.Context, server *rproxy.Server, listener net.Listener,
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processLog *slog.Logger,
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) int {
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served := make(chan error, 1)
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go func() {
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served <- server.Serve(listener)
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}()
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select {
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case err := <-served:
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processLog.Error("serving failed", "error", err.Error())
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return 1
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case <-ctx.Done():
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}
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processLog.Info("stopping")
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shutdownCtx, cancel := context.WithTimeout(context.WithoutCancel(ctx),
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shutdownTimeout)
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defer cancel()
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err := server.Shutdown(shutdownCtx)
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if err != nil {
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processLog.Warn("requests still in progress were cut off",
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"error", err.Error())
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_ = server.Close()
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}
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err = <-served
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if !errors.Is(err, http.ErrServerClosed) {
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processLog.Error("serving failed", "error", err.Error())
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return 1
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}
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server.WaitForReports()
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processLog.Info("stopped")
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return 0
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}
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