feat: proxmox idlewatcher (#88)

* feat: idle sleep for proxmox LXCs

* refactor: replace deprecated docker api types

* chore(api): remove debug task list endpoint

* refactor: move servemux to gphttp/servemux; favicon.go to v1/favicon

* refactor: introduce Pool interface, move agent_pool to agent module

* refactor: simplify api code

* feat: introduce debug api

* refactor: remove net.URL and net.CIDR types, improved unmarshal handling

* chore: update Makefile for debug build tag, update README

* chore: add gperr.Unwrap method

* feat: relative time and duration formatting

* chore: add ROOT_DIR environment variable, refactor

* migration: move homepage override and icon cache to $BASE_DIR/data, add migration code

* fix: nil dereference on marshalling service health

* fix: wait for route deletion

* chore: enhance tasks debuggability

* feat: stdout access logger and MultiWriter

* fix(agent): remove agent properly on verify error

* fix(metrics): disk exclusion logic and added corresponding tests

* chore: update schema and prettify, fix package.json and Makefile

* fix: I/O buffer not being shrunk before putting back to pool

* feat: enhanced error handling module

* chore: deps upgrade

* feat: better value formatting and handling

---------

Co-authored-by: yusing <yusing@6uo.me>

internal/idlewatcher/handle_stream.go

@@ -0,0 +1,84 @@
+package idlewatcher
+
+import (
+	"context"
+	"errors"
+	"net"
+	"time"
+
+	gpnet "github.com/yusing/go-proxy/internal/net/types"
+)
+
+// Setup implements types.Stream.
+func (w *Watcher) Addr() net.Addr {
+	return w.stream.Addr()
+}
+
+// Setup implements types.Stream.
+func (w *Watcher) Setup() error {
+	return w.stream.Setup()
+}
+
+// Accept implements types.Stream.
+func (w *Watcher) Accept() (conn gpnet.StreamConn, err error) {
+	conn, err = w.stream.Accept()
+	if err != nil {
+		return
+	}
+	if wakeErr := w.wakeFromStream(); wakeErr != nil {
+		w.l.Err(wakeErr).Msg("error waking container")
+	}
+	return
+}
+
+// Handle implements types.Stream.
+func (w *Watcher) Handle(conn gpnet.StreamConn) error {
+	if err := w.wakeFromStream(); err != nil {
+		return err
+	}
+	return w.stream.Handle(conn)
+}
+
+// Close implements types.Stream.
+func (w *Watcher) Close() error {
+	return w.stream.Close()
+}
+
+func (w *Watcher) wakeFromStream() error {
+	w.resetIdleTimer()
+
+	// pass through if container is already ready
+	if w.ready() {
+		return nil
+	}
+
+	w.l.Debug().Msg("wake signal received")
+	err := w.wakeIfStopped()
+	if err != nil {
+		return err
+	}
+
+	ctx, cancel := context.WithTimeoutCause(w.task.Context(), w.cfg.WakeTimeout, errors.New("wake timeout"))
+	defer cancel()
+
+	var ready bool
+
+	for {
+		if w.cancelled(ctx) {
+			return context.Cause(ctx)
+		}
+
+		w, ready, err = checkUpdateState(w.Key())
+		if err != nil {
+			return err
+		}
+		if ready {
+			w.resetIdleTimer()
+			w.l.Debug().Stringer("url", w.hc.URL()).Msg("container is ready, passing through")
+			return nil
+		}
+
+		// retry until the container is ready or timeout
+		time.Sleep(idleWakerCheckInterval)
+	}
+}