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handler_repo.go
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/
handler_repo.go
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package chartserver
import (
"fmt"
"path"
"strings"
"sync"
"time"
"github.com/ghodss/yaml"
helm_repo "k8s.io/helm/pkg/repo"
hlog "github.com/goharbor/harbor/src/common/utils/log"
)
const (
maxWorkers = 10
// Keep consistent with 'helm search' command
searchMaxScore = 25
)
// Result returned by worker
type processedResult struct {
namespace string
indexFileOfRepo *helm_repo.IndexFile
}
// GetIndexFile will read the index.yaml under all namespaces and merge them as a single one
// Please be aware that, to support this function, the backend chart repository server should
// enable multi-tenancies
//
// See @ServiceHandler.GetIndexFile
func (c *Controller) GetIndexFile(namespaces []string) (*helm_repo.IndexFile, error) {
if namespaces == nil || len(namespaces) == 0 {
return emptyIndexFile(), nil
}
return c.getIndexYaml(namespaces)
}
// getIndexYaml will get the index yaml files for all the namespaces and merge them
// as one unified index yaml file.
func (c *Controller) getIndexYaml(namespaces []string) (*helm_repo.IndexFile, error) {
// The final merged index file
mergedIndexFile := &helm_repo.IndexFile{
APIVersion: "v1",
Entries: make(map[string]helm_repo.ChartVersions),
Generated: time.Now().Round(time.Second),
PublicKeys: []string{},
}
// Sync the output results from the retriever
resultChan := make(chan *processedResult, 1)
// Receive error
errorChan := make(chan error, 1)
// Signal chan for merging work
mergeDone := make(chan struct{}, 1)
// Total projects/namespaces
total := len(namespaces)
// Initialize
initialItemCount := maxWorkers
if total < maxWorkers {
initialItemCount = total
}
// Retrieve index.yaml for repositories
workerPool := make(chan struct{}, initialItemCount)
// Add initial tokens to the worker
for i := 0; i < initialItemCount; i++ {
workerPool <- struct{}{}
}
// Track all the background threads
waitGroup := new(sync.WaitGroup)
// Start the index files merging thread
go func() {
defer func() {
mergeDone <- struct{}{}
}()
for res := range resultChan {
c.mergeIndexFile(res.namespace, mergedIndexFile, res.indexFileOfRepo)
}
}()
// Retrieve the index files for the repositories
// and blocking here
var err error
LOOP:
for _, ns := range namespaces {
// Check if error has occurred in some goroutines
select {
case err = <-errorChan:
break LOOP
default:
// do nothing
}
// Apply one token before processing
<-workerPool
waitGroup.Add(1)
go func(ns string) {
defer func() {
waitGroup.Done() // done
// Return the worker back to the worker
workerPool <- struct{}{}
}()
indexFile, err := c.getIndexYamlWithNS(ns)
if err != nil {
if len(errorChan) == 0 {
// Only need one error as failure signal
errorChan <- err
}
return
}
// Output
resultChan <- &processedResult{
namespace: ns,
indexFileOfRepo: indexFile,
}
}(ns)
}
// Hold util all the retrieving work are done
waitGroup.Wait()
// close merge channel
close(resultChan)
// Wait until merging thread quit
<-mergeDone
// All the threads are done
// Make sure error in the chan is read
if err == nil && len(errorChan) > 0 {
err = <-errorChan
}
// Met an error
if err != nil {
return nil, err
}
// Remove duplicated keys in public key list
hash := make(map[string]string)
for _, key := range mergedIndexFile.PublicKeys {
hash[key] = key
}
mergedIndexFile.PublicKeys = []string{}
for k := range hash {
mergedIndexFile.PublicKeys = append(mergedIndexFile.PublicKeys, k)
}
return mergedIndexFile, nil
}
// Get the index yaml file under the specified namespace from the backend server
func (c *Controller) getIndexYamlWithNS(namespace string) (*helm_repo.IndexFile, error) {
// Join url path
url := path.Join(namespace, "index.yaml")
url = fmt.Sprintf("%s/%s", c.backendServerAddress.String(), url)
hlog.Debugf("Getting index.yaml from '%s'", url)
content, err := c.apiClient.GetContent(url)
if err != nil {
return nil, err
}
// Traverse to index file object for merging
indexFile := helm_repo.NewIndexFile()
if err := yaml.Unmarshal(content, indexFile); err != nil {
return nil, err
}
return indexFile, nil
}
// Merge the content of mergingIndexFile to the baseIndex
// The chart url should be without --chart-url prefix
func (c *Controller) mergeIndexFile(namespace string,
baseIndex *helm_repo.IndexFile,
mergingIndexFile *helm_repo.IndexFile) {
// Append entries
for chartName, chartVersions := range mergingIndexFile.Entries {
nameWithNS := fmt.Sprintf("%s/%s", namespace, chartName)
for _, version := range chartVersions {
version.Name = nameWithNS
// Currently there is only one url
for index, url := range version.URLs {
if !strings.HasPrefix(url, "http") {
version.URLs[index] = path.Join(namespace, url)
}
}
}
// Appended
baseIndex.Entries[nameWithNS] = chartVersions
}
// Update generated time
if mergingIndexFile.Generated.After(baseIndex.Generated) {
baseIndex.Generated = mergingIndexFile.Generated
}
// Merge public keys
baseIndex.PublicKeys = append(baseIndex.PublicKeys, mergingIndexFile.PublicKeys...)
}
// Generate empty index file
func emptyIndexFile() *helm_repo.IndexFile {
emptyIndexFile := &helm_repo.IndexFile{}
emptyIndexFile.Generated = time.Now().Round(time.Second)
return emptyIndexFile
}