sdk/go/keepclient/support.go

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