sdk/go/keepclient/support.go

   1 /* Internal methods to support keepclient.go */
   2 package keepclient
   3
   4 import (
   5         "crypto/md5"
   6         "git.curoverse.com/arvados.git/sdk/go/streamer"
   7         "errors"
   8         "fmt"
   9         "io"
  10         "io/ioutil"
  11         "log"
  12         "net/http"
  13         "os"
  14         "strings"
  15 )
  16
  17 type keepDisk struct {
  18         Uuid     string `json:"uuid"`
  19         Hostname string `json:"service_host"`
  20         Port     int    `json:"service_port"`
  21         SSL      bool   `json:"service_ssl_flag"`
  22         SvcType  string `json:"service_type"`
  23 }
  24
  25 func Md5String(s string) (string) {
  26         return fmt.Sprintf("%x", md5.Sum([]byte(s)))
  27 }
  28
  29 func (this *KeepClient) DiscoverKeepServers() error {
  30         if prx := os.Getenv("ARVADOS_KEEP_PROXY"); prx != "" {
  31                 sr := map[string]string{"proxy":prx}
  32                 this.SetServiceRoots(sr)
  33                 this.Using_proxy = true
  34                 return nil
  35         }
  36
  37         type svcList struct {
  38                 Items []keepDisk `json:"items"`
  39         }
  40         var m svcList
  41
  42         err := this.Arvados.Call("GET", "keep_services", "", "accessible", nil, &m)
  43
  44         if err != nil {
  45                 if err := this.Arvados.List("keep_disks", nil, &m); err != nil {
  46                         return err
  47                 }
  48         }
  49
  50         listed := make(map[string]bool)
  51         service_roots := make(map[string]string)
  52
  53         for _, element := range m.Items {
  54                 n := ""
  55
  56                 if element.SSL {
  57                         n = "s"
  58                 }
  59
  60                 // Construct server URL
  61                 url := fmt.Sprintf("http%s://%s:%d", n, element.Hostname, element.Port)
  62
  63                 // Skip duplicates
  64                 if !listed[url] {
  65                         listed[url] = true
  66                         service_roots[element.Uuid] = url
  67                 }
  68                 if element.SvcType == "proxy" {
  69                         this.Using_proxy = true
  70                 }
  71         }
  72
  73         this.SetServiceRoots(service_roots)
  74
  75         return nil
  76 }
  77
  78 type uploadStatus struct {
  79         err             error
  80         url             string
  81         statusCode      int
  82         replicas_stored int
  83         response        string
  84 }
  85
  86 func (this KeepClient) uploadToKeepServer(host string, hash string, body io.ReadCloser,
  87         upload_status chan<- uploadStatus, expectedLength int64) {
  88
  89         log.Printf("Uploading %s to %s", hash, host)
  90
  91         var req *http.Request
  92         var err error
  93         var url = fmt.Sprintf("%s/%s", host, hash)
  94         if req, err = http.NewRequest("PUT", url, nil); err != nil {
  95                 upload_status <- uploadStatus{err, url, 0, 0, ""}
  96                 body.Close()
  97                 return
  98         }
  99
 100         if expectedLength > 0 {
 101                 req.ContentLength = expectedLength
 102         }
 103
 104         req.Header.Add("Authorization", fmt.Sprintf("OAuth2 %s", this.Arvados.ApiToken))
 105         req.Header.Add("Content-Type", "application/octet-stream")
 106
 107         if this.Using_proxy {
 108                 req.Header.Add(X_Keep_Desired_Replicas, fmt.Sprint(this.Want_replicas))
 109         }
 110
 111         req.Body = body
 112
 113         var resp *http.Response
 114         if resp, err = this.Client.Do(req); err != nil {
 115                 upload_status <- uploadStatus{err, url, 0, 0, ""}
 116                 body.Close()
 117                 return
 118         }
 119
 120         rep := 1
 121         if xr := resp.Header.Get(X_Keep_Replicas_Stored); xr != "" {
 122                 fmt.Sscanf(xr, "%d", &rep)
 123         }
 124
 125         defer resp.Body.Close()
 126         defer io.Copy(ioutil.Discard, resp.Body)
 127
 128         respbody, err2 := ioutil.ReadAll(&io.LimitedReader{resp.Body, 4096})
 129         if err2 != nil && err2 != io.EOF {
 130                 upload_status <- uploadStatus{err2, url, resp.StatusCode, rep, string(respbody)}
 131                 return
 132         }
 133
 134         locator := strings.TrimSpace(string(respbody))
 135
 136         if resp.StatusCode == http.StatusOK {
 137                 upload_status <- uploadStatus{nil, url, resp.StatusCode, rep, locator}
 138         } else {
 139                 upload_status <- uploadStatus{errors.New(resp.Status), url, resp.StatusCode, rep, locator}
 140         }
 141 }
 142
 143 func (this KeepClient) putReplicas(
 144         hash string,
 145         tr *streamer.AsyncStream,
 146         expectedLength int64) (locator string, replicas int, err error) {
 147
 148         // Calculate the ordering for uploading to servers
 149         sv := NewRootSorter(this.ServiceRoots(), hash).GetSortedRoots()
 150
 151         // The next server to try contacting
 152         next_server := 0
 153
 154         // The number of active writers
 155         active := 0
 156
 157         // Used to communicate status from the upload goroutines
 158         upload_status := make(chan uploadStatus)
 159         defer close(upload_status)
 160
 161         // Desired number of replicas
 162
 163         remaining_replicas := this.Want_replicas
 164
 165         for remaining_replicas > 0 {
 166                 for active < remaining_replicas {
 167                         // Start some upload requests
 168                         if next_server < len(sv) {
 169                                 go this.uploadToKeepServer(sv[next_server], hash, tr.MakeStreamReader(), upload_status, expectedLength)
 170                                 next_server += 1
 171                                 active += 1
 172                         } else {
 173                                 if active == 0 {
 174                                         return locator, (this.Want_replicas - remaining_replicas), InsufficientReplicasError
 175                                 } else {
 176                                         break
 177                                 }
 178                         }
 179                 }
 180
 181                 // Now wait for something to happen.
 182                 status := <-upload_status
 183                 if status.statusCode == 200 {
 184                         // good news!
 185                         remaining_replicas -= status.replicas_stored
 186                         locator = status.response
 187                 } else {
 188                         // writing to keep server failed for some reason
 189                         log.Printf("Keep server put to %v failed with '%v'",
 190                                 status.url, status.err)
 191                 }
 192                 active -= 1
 193                 log.Printf("Upload to %v status code: %v remaining replicas: %v active: %v", status.url, status.statusCode, remaining_replicas, active)
 194         }
 195
 196         return locator, this.Want_replicas, nil
 197 }