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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package poll
import (
"context"
"errors"
"fmt"
"sync"
"sync/atomic"
runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
"connectrpc.com/connect"
log "github.com/sirupsen/logrus"
"golang.org/x/time/rate"
"gitea.com/gitea/act_runner/internal/app/run"
"gitea.com/gitea/act_runner/internal/pkg/client"
"gitea.com/gitea/act_runner/internal/pkg/config"
)
const PollerID = "PollerID"
type Poller interface {
Poll()
Shutdown(ctx context.Context) error
}
type poller struct {
client client.Client
runner run.RunnerInterface
cfg *config.Config
tasksVersion atomic.Int64 // tasksVersion used to store the version of the last task fetched from the Gitea.
pollingCtx context.Context
shutdownPolling context.CancelFunc
jobsCtx context.Context
shutdownJobs context.CancelFunc
done chan any
}
func New(cfg *config.Config, client client.Client, runner run.RunnerInterface) Poller {
return (&poller{}).init(cfg, client, runner)
}
func (p *poller) init(cfg *config.Config, client client.Client, runner run.RunnerInterface) Poller {
pollingCtx, shutdownPolling := context.WithCancel(context.Background())
jobsCtx, shutdownJobs := context.WithCancel(context.Background())
done := make(chan any)
p.client = client
p.runner = runner
p.cfg = cfg
p.pollingCtx = pollingCtx
p.shutdownPolling = shutdownPolling
p.jobsCtx = jobsCtx
p.shutdownJobs = shutdownJobs
p.done = done
return p
}
func (p *poller) Poll() {
limiter := rate.NewLimiter(rate.Every(p.cfg.Runner.FetchInterval), 1)
wg := &sync.WaitGroup{}
for i := 0; i < p.cfg.Runner.Capacity; i++ {
wg.Add(1)
go p.poll(i, wg, limiter)
}
wg.Wait()
// signal the poller is finished
close(p.done)
}
func (p *poller) Shutdown(ctx context.Context) error {
p.shutdownPolling()
select {
case <-p.done:
log.Trace("all jobs are complete")
return nil
case <-ctx.Done():
log.Trace("forcing the jobs to shutdown")
p.shutdownJobs()
<-p.done
log.Trace("all jobs have been shutdown")
return ctx.Err()
}
}
func (p *poller) poll(id int, wg *sync.WaitGroup, limiter *rate.Limiter) {
log.Infof("[poller %d] launched", id)
defer wg.Done()
for {
if err := limiter.Wait(p.pollingCtx); err != nil {
log.Infof("[poller %d] shutdown", id)
return
}
task, ok := p.fetchTask(p.pollingCtx)
if !ok {
continue
}
p.runTaskWithRecover(p.jobsCtx, task)
}
}
func (p *poller) runTaskWithRecover(ctx context.Context, task *runnerv1.Task) {
defer func() {
if r := recover(); r != nil {
err := fmt.Errorf("panic: %v", r)
log.WithError(err).Error("panic in runTaskWithRecover")
}
}()
if err := p.runner.Run(ctx, task); err != nil {
log.WithError(err).Error("failed to run task")
}
}
func (p *poller) fetchTask(ctx context.Context) (*runnerv1.Task, bool) {
reqCtx, cancel := context.WithTimeout(ctx, p.cfg.Runner.FetchTimeout)
defer cancel()
// Load the version value that was in the cache when the request was sent.
v := p.tasksVersion.Load()
resp, err := p.client.FetchTask(reqCtx, connect.NewRequest(&runnerv1.FetchTaskRequest{
TasksVersion: v,
}))
if errors.Is(err, context.DeadlineExceeded) {
log.Trace("deadline exceeded")
err = nil
}
if err != nil {
if errors.Is(err, context.Canceled) {
log.WithError(err).Debugf("shutdown, fetch task canceled")
} else {
log.WithError(err).Error("failed to fetch task")
}
return nil, false
}
if resp == nil || resp.Msg == nil {
return nil, false
}
if resp.Msg.TasksVersion > v {
p.tasksVersion.CompareAndSwap(v, resp.Msg.TasksVersion)
}
if resp.Msg.Task == nil {
return nil, false
}
// got a task, set `tasksVersion` to zero to focre query db in next request.
p.tasksVersion.CompareAndSwap(resp.Msg.TasksVersion, 0)
return resp.Msg.Task, true
}
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