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sync.go
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/
sync.go
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/*
Copyright 2017 WALLIX
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.
*/
package sync
import (
"errors"
"fmt"
"io/ioutil"
"path/filepath"
"strings"
gosync "sync"
"time"
"github.com/wallix/awless/cloud"
"github.com/wallix/awless/config"
"github.com/wallix/awless/graph"
"github.com/wallix/awless/logger"
"github.com/wallix/awless/sync/repo"
)
var DefaultSyncer Syncer
type Syncer interface {
repo.Repo
Sync(...cloud.Service) (map[string]*graph.Graph, error)
SetLogger(*logger.Logger)
}
type syncer struct {
repo.Repo
logger *logger.Logger
}
func NewSyncer() Syncer {
repo, err := repo.New()
if err != nil {
panic(err)
}
return &syncer{Repo: repo, logger: logger.DiscardLogger}
}
func (s *syncer) SetLogger(l *logger.Logger) { s.logger = l }
func (s *syncer) Sync(services ...cloud.Service) (map[string]*graph.Graph, error) {
graphs := make(map[string]*graph.Graph)
var workers gosync.WaitGroup
type result struct {
name string
gph *graph.Graph
start time.Time
}
type srvErr struct {
name string
err error
}
resultc := make(chan *result, len(services))
errorc := make(chan *srvErr, len(services))
for _, service := range services {
workers.Add(1)
go func(srv cloud.Service) {
defer workers.Done()
start := time.Now()
g, err := srv.FetchResources()
errorc <- &srvErr{name: srv.Name(), err: err}
resultc <- &result{name: srv.Name(), gph: g, start: start}
}(service)
}
go func() {
workers.Wait()
close(errorc)
close(resultc)
}()
var allErrors []error
Loop:
for {
select {
case srvErr, ok := <-errorc:
if ok && srvErr.err != nil {
allErrors = append(allErrors, fmt.Errorf("syncing %s: %s", srvErr.name, srvErr.err))
}
case res, ok := <-resultc:
if !ok {
break Loop
}
logger.ExtraVerbosef("sync: fetched %s service took %s", res.name, time.Since(res.start))
graphs[res.name] = res.gph
}
}
var filenames []string
for name, g := range graphs {
filename := fmt.Sprintf("%s.rdf", name)
tofile, err := g.Marshal()
if err != nil {
allErrors = append(allErrors, fmt.Errorf("marshal %s: %s", filename, err))
}
filepath := filepath.Join(config.RepoDir, filename)
if err = ioutil.WriteFile(filepath, tofile, 0600); err != nil {
allErrors = append(allErrors, fmt.Errorf("writing %s: %s", filepath, err))
}
filenames = append(filenames, filename)
}
if err := s.Commit(filenames...); err != nil {
allErrors = append(allErrors, fmt.Errorf("commit %s: %s", strings.Join(filenames, ", "), err))
}
return graphs, concatErrors(allErrors)
}
func concatErrors(errs []error) error {
if len(errs) == 0 {
return nil
}
var lines []string
for _, err := range errs {
lines = append(lines, err.Error())
}
return errors.New(strings.Join(lines, "\n"))
}
func LoadCurrentLocalGraph(serviceName string) *graph.Graph {
path := filepath.Join(config.RepoDir, fmt.Sprintf("%s.rdf", serviceName))
g, err := graph.NewGraphFromFile(path)
if err != nil {
return graph.NewGraph()
}
return g
}