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rserverless.go
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rserverless.go
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// Copyright 2018-2024 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package rserverless
import (
"context"
"sync"
"time"
"github.com/rs/zerolog"
)
// Service represents a serverless service.
type Service interface {
Start()
Close(ctx context.Context) error
}
// Services is a map of service name and its new function.
var Services = map[string]NewService{}
// Register registers a new serverless service with name and new function.
func Register(name string, newFunc NewService) {
Services[name] = newFunc
}
// NewService is the function that serverless services need to register at init time.
type NewService func(context.Context, map[string]interface{}) (Service, error)
// Serverless contains the serveless collection of services.
type Serverless struct {
log *zerolog.Logger
Services map[string]Service
}
// New returns a new serverless collection of services.
func New(opt ...Option) (*Serverless, error) {
l := zerolog.Nop()
n := &Serverless{
Services: map[string]Service{},
log: &l,
}
for _, o := range opt {
o(n)
}
return n, nil
}
// Start starts the serverless service collection.
func (s *Serverless) Start() error {
for name, svc := range s.Services {
go svc.Start()
s.log.Info().Msgf("serverless service enabled: %s", name)
}
return nil
}
// GracefulStop gracefully stops the serverless services.
func (s *Serverless) GracefulStop() error {
var wg sync.WaitGroup
for svcName, svc := range s.Services {
wg.Add(1)
go func(svcName string, svc Service) {
defer wg.Done()
s.log.Info().Msgf("Sending stop request to service %s", svcName)
ctx := context.Background()
err := svc.Close(ctx)
if err != nil {
s.log.Error().Err(err).Msgf("error stopping service %s", svcName)
} else {
s.log.Info().Msgf("service %s stopped", svcName)
}
}(svcName, svc)
}
wg.Wait()
return nil
}
// Stop stops the serverless services with a one second deadline.
func (s *Serverless) Stop() error {
var wg sync.WaitGroup
for svcName, svc := range s.Services {
wg.Add(1)
go func(svcName string, svc Service) {
defer wg.Done()
s.log.Info().Msgf("Sending stop request to service %s", svcName)
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
err := svc.Close(ctx)
if err != nil {
s.log.Error().Err(err).Msgf("error stopping service %s", svcName)
} else {
s.log.Info().Msgf("service %s stopped", svcName)
}
}(svcName, svc)
}
wg.Wait()
return nil
}