+++ /dev/null
-/* Internal methods to support keepclient.go */
-package keepclient
-
-import (
- "arvados.org/streamer"
- "errors"
- "fmt"
- "io"
- "io/ioutil"
- "log"
- "net/http"
- "os"
- "strconv"
- "strings"
-)
-
-type keepDisk struct {
- Hostname string `json:"service_host"`
- Port int `json:"service_port"`
- SSL bool `json:"service_ssl_flag"`
- SvcType string `json:"service_type"`
-}
-
-func (this *KeepClient) DiscoverKeepServers() error {
- if prx := os.Getenv("ARVADOS_KEEP_PROXY"); prx != "" {
- this.SetServiceRoots([]string{prx})
- this.Using_proxy = true
- return nil
- }
-
- type svcList struct {
- Items []keepDisk `json:"items"`
- }
- var m svcList
-
- err := this.Arvados.Call("GET", "keep_services", "", "accessible", nil, &m)
-
- if err != nil {
- if err := this.Arvados.List("keep_disks", nil, &m); err != nil {
- return err
- }
- }
-
- listed := make(map[string]bool)
- service_roots := make([]string, 0, len(m.Items))
-
- for _, element := range m.Items {
- n := ""
-
- if element.SSL {
- n = "s"
- }
-
- // Construct server URL
- url := fmt.Sprintf("http%s://%s:%d", n, element.Hostname, element.Port)
-
- // Skip duplicates
- if !listed[url] {
- listed[url] = true
- service_roots = append(service_roots, url)
- }
- if element.SvcType == "proxy" {
- this.Using_proxy = true
- }
- }
-
- this.SetServiceRoots(service_roots)
-
- return nil
-}
-
-func (this KeepClient) shuffledServiceRoots(hash string) (pseq []string) {
- // Build an ordering with which to query the Keep servers based on the
- // contents of the hash. "hash" is a hex-encoded number at least 8
- // digits (32 bits) long
-
- // seed used to calculate the next keep server from 'pool' to be added
- // to 'pseq'
- seed := hash
-
- // Keep servers still to be added to the ordering
- service_roots := this.ServiceRoots()
- pool := make([]string, len(service_roots))
- copy(pool, service_roots)
-
- // output probe sequence
- pseq = make([]string, 0, len(service_roots))
-
- // iterate while there are servers left to be assigned
- for len(pool) > 0 {
-
- if len(seed) < 8 {
- // ran out of digits in the seed
- if len(pseq) < (len(hash) / 4) {
- // the number of servers added to the probe
- // sequence is less than the number of 4-digit
- // slices in 'hash' so refill the seed with the
- // last 4 digits.
- seed = hash[len(hash)-4:]
- }
- seed += hash
- }
-
- // Take the next 8 digits (32 bytes) and interpret as an integer,
- // then modulus with the size of the remaining pool to get the next
- // selected server.
- probe, _ := strconv.ParseUint(seed[0:8], 16, 32)
- probe %= uint64(len(pool))
-
- // Append the selected server to the probe sequence and remove it
- // from the pool.
- pseq = append(pseq, pool[probe])
- pool = append(pool[:probe], pool[probe+1:]...)
-
- // Remove the digits just used from the seed
- seed = seed[8:]
- }
- return pseq
-}
-
-type uploadStatus struct {
- err error
- url string
- statusCode int
- replicas_stored int
- response string
-}
-
-func (this KeepClient) uploadToKeepServer(host string, hash string, body io.ReadCloser,
- upload_status chan<- uploadStatus, expectedLength int64) {
-
- log.Printf("Uploading %s to %s", hash, host)
-
- var req *http.Request
- var err error
- var url = fmt.Sprintf("%s/%s", host, hash)
- if req, err = http.NewRequest("PUT", url, nil); err != nil {
- upload_status <- uploadStatus{err, url, 0, 0, ""}
- body.Close()
- return
- }
-
- if expectedLength > 0 {
- req.ContentLength = expectedLength
- }
-
- req.Header.Add("Authorization", fmt.Sprintf("OAuth2 %s", this.Arvados.ApiToken))
- req.Header.Add("Content-Type", "application/octet-stream")
-
- if this.Using_proxy {
- req.Header.Add(X_Keep_Desired_Replicas, fmt.Sprint(this.Want_replicas))
- }
-
- req.Body = body
-
- var resp *http.Response
- if resp, err = this.Client.Do(req); err != nil {
- upload_status <- uploadStatus{err, url, 0, 0, ""}
- body.Close()
- return
- }
-
- rep := 1
- if xr := resp.Header.Get(X_Keep_Replicas_Stored); xr != "" {
- fmt.Sscanf(xr, "%d", &rep)
- }
-
- defer resp.Body.Close()
- defer io.Copy(ioutil.Discard, resp.Body)
-
- respbody, err2 := ioutil.ReadAll(&io.LimitedReader{resp.Body, 4096})
- if err2 != nil && err2 != io.EOF {
- upload_status <- uploadStatus{err2, url, resp.StatusCode, rep, string(respbody)}
- return
- }
-
- locator := strings.TrimSpace(string(respbody))
-
- if resp.StatusCode == http.StatusOK {
- upload_status <- uploadStatus{nil, url, resp.StatusCode, rep, locator}
- } else {
- upload_status <- uploadStatus{errors.New(resp.Status), url, resp.StatusCode, rep, locator}
- }
-}
-
-func (this KeepClient) putReplicas(
- hash string,
- tr *streamer.AsyncStream,
- expectedLength int64) (locator string, replicas int, err error) {
-
- // Calculate the ordering for uploading to servers
- sv := this.shuffledServiceRoots(hash)
-
- // The next server to try contacting
- next_server := 0
-
- // The number of active writers
- active := 0
-
- // Used to communicate status from the upload goroutines
- upload_status := make(chan uploadStatus)
- defer close(upload_status)
-
- // Desired number of replicas
-
- remaining_replicas := this.Want_replicas
-
- for remaining_replicas > 0 {
- for active < remaining_replicas {
- // Start some upload requests
- if next_server < len(sv) {
- go this.uploadToKeepServer(sv[next_server], hash, tr.MakeStreamReader(), upload_status, expectedLength)
- next_server += 1
- active += 1
- } else {
- if active == 0 {
- return locator, (this.Want_replicas - remaining_replicas), InsufficientReplicasError
- } else {
- break
- }
- }
- }
-
- // Now wait for something to happen.
- status := <-upload_status
- if status.statusCode == 200 {
- // good news!
- remaining_replicas -= status.replicas_stored
- locator = status.response
- } else {
- // writing to keep server failed for some reason
- log.Printf("Keep server put to %v failed with '%v'",
- status.url, status.err)
- }
- active -= 1
- log.Printf("Upload to %v status code: %v remaining replicas: %v active: %v", status.url, status.statusCode, remaining_replicas, active)
- }
-
- return locator, this.Want_replicas, nil
-}
projects / arvados.git / blobdiff
