+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
package main
import (
+ "context"
"crypto/rand"
- "errors"
"fmt"
- "git.curoverse.com/arvados.git/sdk/go/keepclient"
"io"
"io/ioutil"
- "log"
"time"
+
+ "git.curoverse.com/arvados.git/sdk/go/keepclient"
+
+ log "github.com/Sirupsen/logrus"
)
-// RunPullWorker is used by Keepstore to initiate pull worker channel goroutine.
-// The channel will process pull list.
-// For each (next) pull request:
-// For each locator listed, execute Pull on the server(s) listed
-// Skip the rest of the servers if no errors
-// Repeat
-//
+// RunPullWorker receives PullRequests from pullq, invokes
+// PullItemAndProcess on each one. After each PR, it logs a message
+// indicating whether the pull was successful.
func RunPullWorker(pullq *WorkQueue, keepClient *keepclient.KeepClient) {
- nextItem := pullq.NextItem
- for item := range nextItem {
- pullRequest := item.(PullRequest)
- err := PullItemAndProcess(item.(PullRequest), GenerateRandomAPIToken(), keepClient)
+ for item := range pullq.NextItem {
+ pr := item.(PullRequest)
+ err := PullItemAndProcess(pr, keepClient)
pullq.DoneItem <- struct{}{}
if err == nil {
- log.Printf("Pull %s success", pullRequest)
+ log.Printf("Pull %s success", pr)
} else {
- log.Printf("Pull %s error: %s", pullRequest, err)
+ log.Printf("Pull %s error: %s", pr, err)
}
}
}
-// PullItemAndProcess pulls items from PullQueue and processes them.
-// For each Pull request:
-// Generate a random API token.
-// Generate a permission signature using this token, timestamp ~60 seconds in the future, and desired block hash.
-// Using this token & signature, retrieve the given block.
-// Write to storage
+// PullItemAndProcess executes a pull request by retrieving the
+// specified block from one of the specified servers, and storing it
+// on a local volume.
//
-func PullItemAndProcess(pullRequest PullRequest, token string, keepClient *keepclient.KeepClient) (err error) {
- keepClient.Arvados.ApiToken = token
+// If the PR specifies a non-blank mount UUID, PullItemAndProcess will
+// only attempt to write the data to the corresponding
+// volume. Otherwise it writes to any local volume, as a PUT request
+// would.
+func PullItemAndProcess(pullRequest PullRequest, keepClient *keepclient.KeepClient) error {
+ var vol Volume
+ if uuid := pullRequest.MountUUID; uuid != "" {
+ vol = KeepVM.Lookup(pullRequest.MountUUID, true)
+ if vol == nil {
+ return fmt.Errorf("pull req has nonexistent mount: %v", pullRequest)
+ }
+ }
+
+ keepClient.Arvados.ApiToken = randomToken
serviceRoots := make(map[string]string)
for _, addr := range pullRequest.Servers {
// Generate signature with a random token
expiresAt := time.Now().Add(60 * time.Second)
- signedLocator := SignLocator(pullRequest.Locator, token, expiresAt)
+ signedLocator := SignLocator(pullRequest.Locator, randomToken, expiresAt)
reader, contentLen, _, err := GetContent(signedLocator, keepClient)
if err != nil {
- return
+ return err
}
if reader == nil {
- return errors.New(fmt.Sprintf("No reader found for : %s", signedLocator))
+ return fmt.Errorf("No reader found for : %s", signedLocator)
}
defer reader.Close()
}
if (readContent == nil) || (int64(len(readContent)) != contentLen) {
- return errors.New(fmt.Sprintf("Content not found for: %s", signedLocator))
+ return fmt.Errorf("Content not found for: %s", signedLocator)
}
- err = PutContent(readContent, pullRequest.Locator)
- return
+ writePulledBlock(vol, readContent, pullRequest.Locator)
+ return nil
}
// Fetch the content for the given locator using keepclient.
-var GetContent = func(signedLocator string, keepClient *keepclient.KeepClient) (
- reader io.ReadCloser, contentLength int64, url string, err error) {
- reader, blocklen, url, err := keepClient.Get(signedLocator)
- return reader, blocklen, url, err
+var GetContent = func(signedLocator string, keepClient *keepclient.KeepClient) (io.ReadCloser, int64, string, error) {
+ return keepClient.Get(signedLocator)
}
-const alphaNumeric = "0123456789abcdefghijklmnopqrstuvwxyz"
+var writePulledBlock = func(volume Volume, data []byte, locator string) {
+ var err error
+ if volume != nil {
+ err = volume.Put(context.Background(), locator, data)
+ } else {
+ _, err = PutBlock(context.Background(), data, locator)
+ }
+ if err != nil {
+ log.Printf("error writing pulled block %q: %s", locator, err)
+ }
+}
-// GenerateRandomAPIToken generates a random api token
-func GenerateRandomAPIToken() string {
+var randomToken = func() string {
+ const alphaNumeric = "0123456789abcdefghijklmnopqrstuvwxyz"
var bytes = make([]byte, 36)
rand.Read(bytes)
for i, b := range bytes {
bytes[i] = alphaNumeric[b%byte(len(alphaNumeric))]
}
return (string(bytes))
-}
-
-// Put block
-var PutContent = func(content []byte, locator string) (err error) {
- err = PutBlock(content, locator)
- return
-}
+}()
projects / arvados.git / blobdiff