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package rutina
import (
"context"
"log"
"os"
"os/signal"
"sync"
"sync/atomic"
)
//Rutina is routine manager
type Rutina struct {
ctx context.Context
Cancel func()
wg sync.WaitGroup
o sync.Once
err error
logger *log.Logger
counter *uint64
cancelByError bool
}
// New instance with builtin context
func New(opts ...Option) *Rutina {
ctx, cancel := context.WithCancel(context.Background())
var counter uint64 = 0
r := &Rutina{ctx: ctx, Cancel: cancel, counter: &counter, cancelByError: false}
return r.WithOptions(opts...)
}
func (r *Rutina) WithOptions(opts ...Option) *Rutina {
nr := *r
for _, o := range opts {
o.apply(&nr)
}
return &nr
}
// Go routine
func (r *Rutina) Go(doer func(ctx context.Context) error) {
r.wg.Add(1)
go func() {
id := atomic.AddUint64(r.counter, 1)
defer func() {
if r.logger != nil {
r.logger.Printf("stopping #%d", id)
}
r.wg.Done()
if !r.cancelByError {
r.Cancel()
}
}()
if r.logger != nil {
r.logger.Printf("starting #%d", id)
}
if err := doer(r.ctx); err != nil {
if r.logger != nil {
r.logger.Printf("error at #%d : %v", id, err)
}
r.o.Do(func() {
r.err = err
})
if r.cancelByError {
r.Cancel()
}
}
}()
}
// OS signals handler
func (r *Rutina) ListenOsSignals() {
r.Go(func(ctx context.Context) error {
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt, os.Kill)
select {
case s := <-sig:
if r.logger != nil {
r.logger.Printf("stopping by OS signal (%v)", s)
}
if r.cancelByError {
r.Cancel()
}
case <-ctx.Done():
}
return nil
})
}
// Wait all routines and returns first error or nil if all routines completes without errors
func (r *Rutina) Wait() error {
r.wg.Wait()
return r.err
}
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