package main
import (
+ "context"
"crypto/rand"
- "errors"
"fmt"
- "git.curoverse.com/arvados.git/sdk/go/arvadosclient"
"git.curoverse.com/arvados.git/sdk/go/keepclient"
+ "io"
"io/ioutil"
- "log"
- "os"
"time"
-)
-
-var arv arvadosclient.ArvadosClient
-var keepClient keepclient.KeepClient
-
-/*
- Keepstore initiates 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
-*/
-func RunPullWorker(nextItem <-chan interface{}) {
- var err error
- arv, err = arvadosclient.MakeArvadosClient()
- if err != nil {
- log.Fatalf("Error setting up arvados client %s", err.Error())
- }
- arv.ApiToken = os.Getenv("ARVADOS_API_TOKEN")
- keepClient, err = keepclient.MakeKeepClient(&arv)
- if err != nil {
- log.Fatalf("Error setting up keep client %s", err.Error())
- }
+ 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
+//
+func RunPullWorker(pullq *WorkQueue, keepClient *keepclient.KeepClient) {
+ nextItem := pullq.NextItem
for item := range nextItem {
- pullReq := item.(PullRequest)
- for _, addr := range pullReq.Servers {
- err := Pull(addr, pullReq.Locator)
- if err == nil {
- break
- }
+ pullRequest := item.(PullRequest)
+ err := PullItemAndProcess(item.(PullRequest), GenerateRandomAPIToken(), keepClient)
+ pullq.DoneItem <- struct{}{}
+ if err == nil {
+ log.Printf("Pull %s success", pullRequest)
+ } else {
+ log.Printf("Pull %s error: %s", pullRequest, err)
}
}
}
-/*
- 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
-*/
-func Pull(addr string, locator string) (err error) {
- log.Printf("Pull %s/%s starting", addr, locator)
-
- defer func() {
- if err == nil {
- log.Printf("Pull %s/%s success", addr, locator)
- } else {
- log.Printf("Pull %s/%s error: %s", addr, locator, 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
+//
+func PullItemAndProcess(pullRequest PullRequest, token string, keepClient *keepclient.KeepClient) (err error) {
+ keepClient.Arvados.ApiToken = token
+
+ serviceRoots := make(map[string]string)
+ for _, addr := range pullRequest.Servers {
+ serviceRoots[addr] = addr
+ }
+ keepClient.SetServiceRoots(serviceRoots, nil, nil)
- service_roots := make(map[string]string)
- service_roots[locator] = addr
- keepClient.SetServiceRoots(service_roots)
+ // Generate signature with a random token
+ expiresAt := time.Now().Add(60 * time.Second)
+ signedLocator := SignLocator(pullRequest.Locator, token, expiresAt)
- read_content, err := GetContent(addr, locator)
- log.Print(read_content, err)
+ reader, contentLen, _, err := GetContent(signedLocator, keepClient)
if err != nil {
return
}
-
- err = PutContent(read_content, locator)
- return
-}
-
-// Fetch the content for the given locator using keepclient.
-var GetContent = func(addr string, locator string) ([]byte, error) {
- // Generate signature with a random token
- PermissionSecret = []byte(os.Getenv("ARVADOS_API_TOKEN"))
- expires_at := time.Now().Add(60 * time.Second)
- signedLocator := SignLocator(locator, GenerateRandomApiToken(), expires_at)
- reader, blocklen, _, err := keepClient.Get(signedLocator)
- defer reader.Close()
- if err != nil {
- return nil, err
+ if reader == nil {
+ return fmt.Errorf("No reader found for : %s", signedLocator)
}
+ defer reader.Close()
- read_content, err := ioutil.ReadAll(reader)
- log.Print(read_content, err)
+ readContent, err := ioutil.ReadAll(reader)
if err != nil {
- return nil, err
+ return err
}
- if (read_content == nil) || (int64(len(read_content)) != blocklen) {
- return nil, errors.New(fmt.Sprintf("Content not found for: %s", signedLocator))
+ if (readContent == nil) || (int64(len(readContent)) != contentLen) {
+ return fmt.Errorf("Content not found for: %s", signedLocator)
}
- return read_content, nil
+ err = PutContent(readContent, pullRequest.Locator)
+ return
+}
+
+// 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
}
-const ALPHA_NUMERIC = "0123456789abcdefghijklmnopqrstuvwxyz"
+const alphaNumeric = "0123456789abcdefghijklmnopqrstuvwxyz"
-func GenerateRandomApiToken() string {
+// GenerateRandomAPIToken generates a random api token
+func GenerateRandomAPIToken() string {
var bytes = make([]byte, 36)
rand.Read(bytes)
for i, b := range bytes {
- bytes[i] = ALPHA_NUMERIC[b%byte(len(ALPHA_NUMERIC))]
+ 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)
+ _, err = PutBlock(context.Background(), content, locator)
return
}