woodpecker/cmd/agent/core/health.go

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// Copyright 2018 Drone.IO Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// 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
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package core
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import (
"context"
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"encoding/json"
"fmt"
"net/http"
"strings"
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"github.com/rs/zerolog/log"
"github.com/urfave/cli/v3"
"go.woodpecker-ci.org/woodpecker/v2/agent"
"go.woodpecker-ci.org/woodpecker/v2/version"
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)
// The file implements some basic healthcheck logic based on the
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// following specification:
// https://github.com/mozilla-services/Dockerflow
func initHealth() {
http.HandleFunc("/varz", handleStats)
http.HandleFunc("/healthz", handleHeartbeat)
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http.HandleFunc("/version", handleVersion)
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}
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func handleHeartbeat(w http.ResponseWriter, _ *http.Request) {
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if counter.Healthy() {
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w.WriteHeader(http.StatusOK)
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} else {
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w.WriteHeader(http.StatusInternalServerError)
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}
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}
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func handleVersion(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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w.Header().Add("Content-Type", "text/json")
err := json.NewEncoder(w).Encode(versionResp{
Source: "https://github.com/woodpecker-ci/woodpecker",
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Version: version.String(),
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})
if err != nil {
log.Error().Err(err).Msg("handleVersion")
}
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}
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func handleStats(w http.ResponseWriter, _ *http.Request) {
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if counter.Healthy() {
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w.WriteHeader(http.StatusOK)
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} else {
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w.WriteHeader(http.StatusInternalServerError)
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}
w.Header().Add("Content-Type", "text/json")
if _, err := counter.WriteTo(w); err != nil {
log.Error().Err(err).Msg("handleStats")
}
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}
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type versionResp struct {
Version string `json:"version"`
Source string `json:"source"`
}
// Default statistics counter.
var counter = &agent.State{
Metadata: map[string]agent.Info{},
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}
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// handles pinging the endpoint and returns an error if the
// agent is in an unhealthy state.
func pinger(ctx context.Context, c *cli.Command) error {
healthcheckAddress := c.String("healthcheck-addr")
if strings.HasPrefix(healthcheckAddress, ":") {
// this seems sufficient according to https://pkg.go.dev/net#Dial
healthcheckAddress = "localhost" + healthcheckAddress
}
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, "http://"+healthcheckAddress+"/healthz", nil)
if err != nil {
return err
}
resp, err := http.DefaultClient.Do(req)
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if err != nil {
return err
}
defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
return fmt.Errorf("agent returned non-http.StatusOK status code")
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}
return nil
}