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package workflow
import (
"context"
"sync"
"sync/atomic"
"time"
"github.com/cenkalti/backoff/v4"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/pkg/events"
"github.com/spiral/roadrunner/v2/pkg/worker"
"github.com/spiral/roadrunner/v2/plugins/logger"
"github.com/spiral/roadrunner/v2/plugins/server"
"github.com/spiral/roadrunner/v2/plugins/temporal/client"
)
const (
// PluginName defines public service name.
PluginName = "workflows"
// RRMode sets as RR_MODE env variable to let worker know about the mode to run.
RRMode = "temporal/workflow"
)
// Plugin manages workflows and workers.
type Plugin struct {
temporal client.Temporal
events events.Handler
server server.Server
log logger.Logger
mu sync.Mutex
reset chan struct{}
pool workflowPool
closing int64
}
// Init workflow plugin.
func (p *Plugin) Init(temporal client.Temporal, server server.Server, log logger.Logger) error {
p.temporal = temporal
p.server = server
p.events = events.NewEventsHandler()
p.log = log
p.reset = make(chan struct{}, 1)
return nil
}
// Serve starts workflow service.
func (p *Plugin) Serve() chan error {
const op = errors.Op("workflow_plugin_serve")
errCh := make(chan error, 1)
pool, err := p.startPool()
if err != nil {
errCh <- errors.E(op, err)
return errCh
}
p.pool = pool
go func() {
for {
select {
case <-p.reset:
if atomic.LoadInt64(&p.closing) == 1 {
return
}
err := p.replacePool()
if err == nil {
continue
}
bkoff := backoff.NewExponentialBackOff()
bkoff.InitialInterval = time.Second
err = backoff.Retry(p.replacePool, bkoff)
if err != nil {
errCh <- errors.E(op, err)
}
}
}
}()
return errCh
}
// Stop workflow service.
func (p *Plugin) Stop() error {
const op = errors.Op("workflow_plugin_stop")
atomic.StoreInt64(&p.closing, 1)
pool := p.getPool()
if pool != nil {
p.pool = nil
err := pool.Destroy(context.Background())
if err != nil {
return errors.E(op, err)
}
return nil
}
return nil
}
// Name of the service.
func (p *Plugin) Name() string {
return PluginName
}
// Workers returns list of available workflow workers.
func (p *Plugin) Workers() []worker.BaseProcess {
p.mu.Lock()
defer p.mu.Unlock()
return p.pool.Workers()
}
// WorkflowNames returns list of all available workflows.
func (p *Plugin) WorkflowNames() []string {
return p.pool.WorkflowNames()
}
// Reset resets underlying workflow pool with new copy.
func (p *Plugin) Reset() error {
p.reset <- struct{}{}
return nil
}
// AddListener adds event listeners to the service.
func (p *Plugin) poolListener(event interface{}) {
if ev, ok := event.(PoolEvent); ok {
if ev.Event == eventWorkerExit {
if ev.Caused != nil {
p.log.Error("Workflow pool error", "error", ev.Caused)
}
p.reset <- struct{}{}
}
}
p.events.Push(event)
}
// AddListener adds event listeners to the service.
func (p *Plugin) startPool() (workflowPool, error) {
const op = errors.Op("workflow_plugin_start_pool")
pool, err := newWorkflowPool(
p.temporal.GetCodec().WithLogger(p.log),
p.poolListener,
p.server,
)
if err != nil {
return nil, errors.E(op, err)
}
err = pool.Start(context.Background(), p.temporal)
if err != nil {
return nil, errors.E(op, err)
}
p.log.Debug("Started workflow processing", "workflows", pool.WorkflowNames())
return pool, nil
}
func (p *Plugin) replacePool() error {
p.mu.Lock()
const op = errors.Op("workflow_plugin_replace_pool")
defer p.mu.Unlock()
if p.pool != nil {
err := p.pool.Destroy(context.Background())
p.pool = nil
if err != nil {
p.log.Error(
"Unable to destroy expired workflow pool",
"error",
errors.E(op, err),
)
return errors.E(op, err)
}
}
pool, err := p.startPool()
if err != nil {
p.log.Error("Replace workflow pool failed", "error", err)
return errors.E(op, err)
}
p.pool = pool
p.log.Debug("workflow pool successfully replaced")
return nil
}
// getPool returns currently pool.
func (p *Plugin) getPool() workflowPool {
p.mu.Lock()
defer p.mu.Unlock()
return p.pool
}
|
