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coordinator.go
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/
coordinator.go
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package coordinator
import (
"context"
"fmt"
"time"
"github.com/labstack/echo/v4"
"github.com/pkg/errors"
"github.com/rs/zerolog/log"
"github.com/runabol/tork"
"github.com/runabol/tork/datastore"
"github.com/runabol/tork/internal/coordinator/api"
"github.com/runabol/tork/internal/coordinator/handlers"
"github.com/runabol/tork/input"
"github.com/runabol/tork/middleware/job"
"github.com/runabol/tork/middleware/node"
"github.com/runabol/tork/middleware/task"
"github.com/runabol/tork/middleware/web"
"github.com/runabol/tork/mq"
"github.com/runabol/tork/internal/uuid"
)
// Coordinator is responsible for accepting tasks from
// clients, scheduling tasks for workers to execute and for
// exposing the cluster's state to the outside world.
type Coordinator struct {
Name string
broker mq.Broker
api *api.API
ds datastore.Datastore
queues map[string]int
onPending task.HandlerFunc
onStarted task.HandlerFunc
onError task.HandlerFunc
onJob job.HandlerFunc
onHeartbeat node.HandlerFunc
onCompleted task.HandlerFunc
}
type Config struct {
Broker mq.Broker
DataStore datastore.Datastore
Address string
Queues map[string]int
Endpoints map[string]web.HandlerFunc
Enabled map[string]bool
Middleware Middleware
}
type Middleware struct {
Web []web.MiddlewareFunc
Task []task.MiddlewareFunc
Job []job.MiddlewareFunc
Node []node.MiddlewareFunc
Echo []echo.MiddlewareFunc
}
func NewCoordinator(cfg Config) (*Coordinator, error) {
if cfg.Broker == nil {
return nil, errors.New("most provide a broker")
}
if cfg.DataStore == nil {
return nil, errors.New("most provide a datastore")
}
name := fmt.Sprintf("coordinator-%s", uuid.NewUUID())
if cfg.Queues == nil {
cfg.Queues = make(map[string]int)
}
if cfg.Endpoints == nil {
cfg.Endpoints = make(map[string]web.HandlerFunc)
}
if cfg.Enabled == nil {
cfg.Enabled = make(map[string]bool)
}
if cfg.Queues[mq.QUEUE_COMPLETED] < 1 {
cfg.Queues[mq.QUEUE_COMPLETED] = 1
}
if cfg.Queues[mq.QUEUE_ERROR] < 1 {
cfg.Queues[mq.QUEUE_ERROR] = 1
}
if cfg.Queues[mq.QUEUE_PENDING] < 1 {
cfg.Queues[mq.QUEUE_PENDING] = 1
}
if cfg.Queues[mq.QUEUE_STARTED] < 1 {
cfg.Queues[mq.QUEUE_STARTED] = 1
}
if cfg.Queues[mq.QUEUE_HEARTBEAT] < 1 {
cfg.Queues[mq.QUEUE_HEARTBEAT] = 1
}
if cfg.Queues[mq.QUEUE_JOBS] < 1 {
cfg.Queues[mq.QUEUE_JOBS] = 1
}
api, err := api.NewAPI(api.Config{
Broker: cfg.Broker,
DataStore: cfg.DataStore,
Address: cfg.Address,
Middleware: api.Middleware{
Web: cfg.Middleware.Web,
Echo: cfg.Middleware.Echo,
Job: cfg.Middleware.Job,
Task: cfg.Middleware.Task,
},
Endpoints: cfg.Endpoints,
Enabled: cfg.Enabled,
})
if err != nil {
return nil, err
}
onPending := task.ApplyMiddleware(
handlers.NewPendingHandler(cfg.DataStore, cfg.Broker),
cfg.Middleware.Task,
)
onStarted := task.ApplyMiddleware(
handlers.NewStartedHandler(cfg.DataStore, cfg.Broker),
cfg.Middleware.Task,
)
onError := task.ApplyMiddleware(
handlers.NewErrorHandler(cfg.DataStore, cfg.Broker),
cfg.Middleware.Task,
)
onCompleted := task.ApplyMiddleware(
handlers.NewCompletedHandler(
cfg.DataStore,
cfg.Broker,
cfg.Middleware.Job...,
),
cfg.Middleware.Task,
)
onJob := job.ApplyMiddleware(
handlers.NewJobHandler(
cfg.DataStore,
cfg.Broker,
cfg.Middleware.Task...,
),
cfg.Middleware.Job,
)
onHeartbeat := node.ApplyMiddleware(
handlers.NewHeartbeatHandler(cfg.DataStore),
cfg.Middleware.Node,
)
return &Coordinator{
Name: name,
api: api,
broker: cfg.Broker,
ds: cfg.DataStore,
queues: cfg.Queues,
onPending: onPending,
onStarted: onStarted,
onError: onError,
onJob: onJob,
onHeartbeat: onHeartbeat,
onCompleted: onCompleted,
}, nil
}
func (c *Coordinator) SubmitJob(ctx context.Context, ij *input.Job) (*tork.Job, error) {
return c.api.SubmitJob(ctx, ij)
}
func (c *Coordinator) Start() error {
log.Info().Msgf("starting Coordinator")
// start the coordinator API
if err := c.api.Start(); err != nil {
return err
}
// subscribe to task queues
for qname, conc := range c.queues {
if !mq.IsCoordinatorQueue(qname) {
continue
}
for i := 0; i < conc; i++ {
var err error
switch qname {
case mq.QUEUE_PENDING:
err = c.broker.SubscribeForTasks(qname, func(t *tork.Task) error {
return c.onPending(context.Background(), task.StateChange, t)
})
case mq.QUEUE_COMPLETED:
err = c.broker.SubscribeForTasks(qname, func(t *tork.Task) error {
return c.onCompleted(context.Background(), task.StateChange, t)
})
case mq.QUEUE_STARTED:
err = c.broker.SubscribeForTasks(qname, func(t *tork.Task) error {
return c.onStarted(context.Background(), task.StateChange, t)
})
case mq.QUEUE_ERROR:
err = c.broker.SubscribeForTasks(qname, func(t *tork.Task) error {
return c.onError(context.Background(), task.StateChange, t)
})
case mq.QUEUE_HEARTBEAT:
err = c.broker.SubscribeForHeartbeats(func(n *tork.Node) error {
return c.onHeartbeat(context.Background(), n)
})
case mq.QUEUE_JOBS:
err = c.broker.SubscribeForJobs(func(j *tork.Job) error {
return c.onJob(context.Background(), job.StateChange, j)
})
}
if err != nil {
return err
}
}
}
return nil
}
func (c *Coordinator) Stop() error {
log.Debug().Msgf("shutting down %s", c.Name)
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
defer cancel()
if err := c.broker.Shutdown(ctx); err != nil {
return errors.Wrapf(err, "error shutting down broker")
}
if err := c.api.Shutdown(ctx); err != nil {
return errors.Wrapf(err, "error shutting down API")
}
return nil
}