145 lines
3.2 KiB
Go
145 lines
3.2 KiB
Go
// Copyright 2018 Drone.IO Inc.
|
|
//
|
|
// 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
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// 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 main
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/drone/drone/version"
|
|
"github.com/urfave/cli"
|
|
)
|
|
|
|
// the file implements some basic healthcheck logic based on the
|
|
// following specification:
|
|
// https://github.com/mozilla-services/Dockerflow
|
|
|
|
func init() {
|
|
http.HandleFunc("/varz", handleStats)
|
|
http.HandleFunc("/healthz", handleHeartbeat)
|
|
http.HandleFunc("/version", handleVersion)
|
|
}
|
|
|
|
func handleHeartbeat(w http.ResponseWriter, r *http.Request) {
|
|
if counter.Healthy() {
|
|
w.WriteHeader(200)
|
|
} else {
|
|
w.WriteHeader(500)
|
|
}
|
|
}
|
|
|
|
func handleVersion(w http.ResponseWriter, r *http.Request) {
|
|
w.WriteHeader(200)
|
|
w.Header().Add("Content-Type", "text/json")
|
|
json.NewEncoder(w).Encode(versionResp{
|
|
Source: "https://github.com/drone/drone",
|
|
Version: version.Version.String(),
|
|
})
|
|
}
|
|
|
|
func handleStats(w http.ResponseWriter, r *http.Request) {
|
|
if counter.Healthy() {
|
|
w.WriteHeader(200)
|
|
} else {
|
|
w.WriteHeader(500)
|
|
}
|
|
w.Header().Add("Content-Type", "text/json")
|
|
counter.writeTo(w)
|
|
}
|
|
|
|
type versionResp struct {
|
|
Version string `json:"version"`
|
|
Source string `json:"source"`
|
|
}
|
|
|
|
// default statistics counter
|
|
var counter = &state{
|
|
Metadata: map[string]info{},
|
|
}
|
|
|
|
type state struct {
|
|
sync.Mutex `json:"-"`
|
|
Polling int `json:"polling_count"`
|
|
Running int `json:"running_count"`
|
|
Metadata map[string]info `json:"running"`
|
|
}
|
|
|
|
type info struct {
|
|
ID string `json:"id"`
|
|
Repo string `json:"repository"`
|
|
Build string `json:"build_number"`
|
|
Started time.Time `json:"build_started"`
|
|
Timeout time.Duration `json:"build_timeout"`
|
|
}
|
|
|
|
func (s *state) Add(id string, timeout time.Duration, repo, build string) {
|
|
s.Lock()
|
|
s.Polling--
|
|
s.Running++
|
|
s.Metadata[id] = info{
|
|
ID: id,
|
|
Repo: repo,
|
|
Build: build,
|
|
Timeout: timeout,
|
|
Started: time.Now().UTC(),
|
|
}
|
|
s.Unlock()
|
|
}
|
|
|
|
func (s *state) Done(id string) {
|
|
s.Lock()
|
|
s.Polling++
|
|
s.Running--
|
|
delete(s.Metadata, id)
|
|
s.Unlock()
|
|
}
|
|
|
|
func (s *state) Healthy() bool {
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
now := time.Now()
|
|
buf := time.Hour // 1 hour buffer
|
|
for _, item := range s.Metadata {
|
|
if now.After(item.Started.Add(item.Timeout).Add(buf)) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (s *state) writeTo(w io.Writer) (int, error) {
|
|
s.Lock()
|
|
out, _ := json.Marshal(s)
|
|
s.Unlock()
|
|
return w.Write(out)
|
|
}
|
|
|
|
// handles pinging the endpoint and returns an error if the
|
|
// agent is in an unhealthy state.
|
|
func pinger(c *cli.Context) error {
|
|
resp, err := http.Get("http://localhost:3000/healthz")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer resp.Body.Close()
|
|
if resp.StatusCode != 200 {
|
|
return fmt.Errorf("agent returned non-200 status code")
|
|
}
|
|
return nil
|
|
}
|