mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Ayush RanjanandgVisor bot
f62a4a77d5
Starting with Go 1.21, build tags select the language version. We currently have several `go:build go1.1` tags, which were intended to act as "true" tags. But that will break with 1.21. So replace them with "!false". Fixes #9568. PiperOrigin-RevId: 576020779
105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
// Copyright 2023 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !false
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// +build !false
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package metricserver
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import (
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"context"
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"os"
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"time"
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"gvisor.dev/gvisor/pkg/log"
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"gvisor.dev/gvisor/runsc/container"
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)
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// verifyLoopInterval is the interval at which we check whether there are any sandboxes we need
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// to serve metrics for.
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const verifyLoopInterval = 20 * time.Second
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// sandboxData contains additional per-sandbox data.
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type sandboxData struct{}
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// load loads additional per-sandbox data.
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func (s *sandboxData) load(*servedSandbox) error {
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return nil
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}
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// serverData contains additional server-wide data.
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type serverData struct{}
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// verify is one iteration of verifyLoop.
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// It runs in a loop in the background which checks all sandboxes for liveness, tries to load
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// their metadata if that hasn't been loaded yet, and tries to pick up new sandboxes that
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// failed to register for whatever reason.
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func (m *metricServer) verify(ctx context.Context) {
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_, err := container.ListSandboxes(m.rootDir)
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m.mu.Lock()
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defer m.mu.Unlock()
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if err != nil {
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if !m.allowUnknownRoot {
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log.Warningf("Cannot list sandboxes in root directory %s, it has likely gone away: %v. Server shutting down.", m.rootDir, err)
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m.shutdownLocked(ctx)
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}
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return
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}
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m.refreshSandboxesLocked()
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}
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// startVerifyLoop runs in the background and periodically calls verify.
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func (m *metricServer) startVerifyLoop(ctx context.Context) error {
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go func() {
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ticker := time.NewTicker(verifyLoopInterval)
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defer ticker.Stop()
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for ctx.Err() == nil {
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select {
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case <-ctx.Done():
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return
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case <-m.shutdownCh:
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log.Infof("Received interrupt signal, shutting down server.")
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m.mu.Lock()
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m.shutdownLocked(ctx)
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m.mu.Unlock()
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return
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case <-ticker.C:
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m.verify(ctx)
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}
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}
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}()
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return nil
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}
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// shutdownLocked shuts down the server. It assumes mu is held.
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func (m *metricServer) shutdownLocked(ctx context.Context) {
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log.Infof("Server shutting down.")
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m.shuttingDown = true
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if m.udsPath != "" {
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if err := os.Remove(m.udsPath); err != nil {
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log.Warningf("Cannot remove UDS at %s: %v", m.udsPath, err)
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} else {
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m.udsPath = ""
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}
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}
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if m.pidFile != "" {
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if err := os.Remove(m.pidFile); err != nil {
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log.Warningf("Cannot remove PID file at %s: %v", m.pidFile, err)
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} else {
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m.pidFile = ""
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}
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}
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m.srv.Shutdown(ctx)
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}
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