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                 if this.Client.Timeout == 0 {
  36                         this.Client.Timeout = 10 * time.Minute
  37                 }
  38                 return nil
  39         }
  40
  41         if this.Client.Timeout == 0 {
  42                 this.Client.Timeout = 15 * time.Second
  43         }
  44
  45         type svcList struct {
  46                 Items []keepDisk `json:"items"`
  47         }
  48         var m svcList
  49
  50         err := this.Arvados.Call("GET", "keep_services", "", "accessible", nil, &m)
  51
  52         if err != nil {
  53                 if err := this.Arvados.List("keep_disks", nil, &m); err != nil {
  54                         return err
  55                 }
  56         }
  57
  58         listed := make(map[string]bool)
  59         service_roots := make(map[string]string)
  60
  61         for _, element := range m.Items {
  62                 n := ""
  63
  64                 if element.SSL {
  65                         n = "s"
  66                 }
  67
  68                 // Construct server URL
  69                 url := fmt.Sprintf("http%s://%s:%d", n, element.Hostname, element.Port)
  70
  71                 // Skip duplicates
  72                 if !listed[url] {
  73                         listed[url] = true
  74                         service_roots[element.Uuid] = url
  75                 }
  76                 if element.SvcType == "proxy" {
  77                         this.Using_proxy = true
  78                 }
  79         }
  80
  81         this.SetServiceRoots(service_roots)
  82
  83         return nil
  84 }
  85
  86 type uploadStatus struct {
  87         err             error
  88         url             string
  89         statusCode      int
  90         replicas_stored int
  91         response        string
  92 }
  93
  94 func (this KeepClient) uploadToKeepServer(host string, hash string, body io.ReadCloser,
  95         upload_status chan<- uploadStatus, expectedLength int64, requestId string) {
  96
  97         var req *http.Request
  98         var err error
  99         var url = fmt.Sprintf("%s/%s", host, hash)
 100         if req, err = http.NewRequest("PUT", url, nil); err != nil {
 101                 log.Printf("[%v] Error creating request PUT %v error: %v", requestId, url, err.Error())
 102                 upload_status <- uploadStatus{err, url, 0, 0, ""}
 103                 body.Close()
 104                 return
 105         }
 106
 107         if expectedLength > -1 {
 108                 req.ContentLength = expectedLength
 109         }
 110         if expectedLength == 0 {
 111                 defer body.Close()
 112         }
 113
 114         req.Header.Add("Authorization", fmt.Sprintf("OAuth2 %s", this.Arvados.ApiToken))
 115         req.Header.Add("Content-Type", "application/octet-stream")
 116
 117         if this.Using_proxy {
 118                 req.Header.Add(X_Keep_Desired_Replicas, fmt.Sprint(this.Want_replicas))
 119         }
 120
 121         req.Body = body
 122
 123         var resp *http.Response
 124         if resp, err = this.Client.Do(req); err != nil {
 125                 log.Printf("[%v] Upload failed %v error: %v", requestId, url, err.Error())
 126                 upload_status <- uploadStatus{err, url, 0, 0, ""}
 127                 return
 128         }
 129
 130         rep := 1
 131         if xr := resp.Header.Get(X_Keep_Replicas_Stored); xr != "" {
 132                 fmt.Sscanf(xr, "%d", &rep)
 133         }
 134
 135         defer resp.Body.Close()
 136         defer io.Copy(ioutil.Discard, resp.Body)
 137
 138         respbody, err2 := ioutil.ReadAll(&io.LimitedReader{resp.Body, 4096})
 139         response := strings.TrimSpace(string(respbody))
 140         if err2 != nil && err2 != io.EOF {
 141                 log.Printf("[%v] Upload %v error: %v response: %v", requestId, url, err2.Error(), response)
 142                 upload_status <- uploadStatus{err2, url, resp.StatusCode, rep, response}
 143         } else if resp.StatusCode == http.StatusOK {
 144                 log.Printf("[%v] Upload %v success", requestId, url)
 145                 upload_status <- uploadStatus{nil, url, resp.StatusCode, rep, response}
 146         } else {
 147                 log.Printf("[%v] Upload %v error: %v response: %v", requestId, url, resp.StatusCode, response)
 148                 upload_status <- uploadStatus{errors.New(resp.Status), url, resp.StatusCode, rep, response}
 149         }
 150 }
 151
 152 func (this KeepClient) putReplicas(
 153         hash string,
 154         tr *streamer.AsyncStream,
 155         expectedLength int64) (locator string, replicas int, err error) {
 156
 157         // Take the hash of locator and timestamp in order to identify this
 158         // specific transaction in log statements.
 159         requestId := fmt.Sprintf("%x", md5.Sum([]byte(locator+time.Now().String())))[0:8]
 160
 161         // Calculate the ordering for uploading to servers
 162         sv := NewRootSorter(this.ServiceRoots(), hash).GetSortedRoots()
 163
 164         // The next server to try contacting
 165         next_server := 0
 166
 167         // The number of active writers
 168         active := 0
 169
 170         // Used to communicate status from the upload goroutines
 171         upload_status := make(chan uploadStatus)
 172         defer close(upload_status)
 173
 174         // Desired number of replicas
 175         remaining_replicas := this.Want_replicas
 176
 177         for remaining_replicas > 0 {
 178                 for active < remaining_replicas {
 179                         // Start some upload requests
 180                         if next_server < len(sv) {
 181                                 log.Printf("[%v] Begin upload %s to %s", requestId, hash, sv[next_server])
 182                                 go this.uploadToKeepServer(sv[next_server], hash, tr.MakeStreamReader(), upload_status, expectedLength, requestId)
 183                                 next_server += 1
 184                                 active += 1
 185                         } else {
 186                                 if active == 0 {
 187                                         return locator, (this.Want_replicas - remaining_replicas), InsufficientReplicasError
 188                                 } else {
 189                                         break
 190                                 }
 191                         }
 192                 }
 193                 log.Printf("[%v] Replicas remaining to write: %v active uploads: %v",
 194                         requestId, remaining_replicas, active)
 195
 196                 // Now wait for something to happen.
 197                 status := <-upload_status
 198                 active -= 1
 199
 200                 if status.statusCode == 200 {
 201                         // good news!
 202                         remaining_replicas -= status.replicas_stored
 203                         locator = status.response
 204                 }
 205         }
 206
 207         return locator, this.Want_replicas, nil
 208 }