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"
  13         "net/http"
  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 // Set timeouts apply when connecting to keepproxy services (assumed to be over
  31 // the Internet).
  32 func (this *KeepClient) setClientSettingsProxy() {
  33         if this.Client.Timeout == 0 {
  34                 // Maximum time to wait for a complete response
  35                 this.Client.Timeout = 300 * time.Second
  36
  37                 // TCP and TLS connection settings
  38                 this.Client.Transport = &http.Transport{
  39                         Dial: (&net.Dialer{
  40                                 // The maximum time to wait to set up
  41                                 // the initial TCP connection.
  42                                 Timeout: 30 * time.Second,
  43
  44                                 // The TCP keep alive heartbeat
  45                                 // interval.
  46                                 KeepAlive: 120 * time.Second,
  47                         }).Dial,
  48
  49                         TLSHandshakeTimeout: 10 * time.Second,
  50                 }
  51         }
  52
  53 }
  54
  55 // Set timeouts apply when connecting to keepstore services directly (assumed
  56 // to be on the local network).
  57 func (this *KeepClient) setClientSettingsStore() {
  58         if this.Client.Timeout == 0 {
  59                 // Maximum time to wait for a complete response
  60                 this.Client.Timeout = 20 * time.Second
  61
  62                 // TCP and TLS connection timeouts
  63                 this.Client.Transport = &http.Transport{
  64                         Dial: (&net.Dialer{
  65                                 // The maximum time to wait to set up
  66                                 // the initial TCP connection.
  67                                 Timeout: 2 * time.Second,
  68
  69                                 // The TCP keep alive heartbeat
  70                                 // interval.
  71                                 KeepAlive: 180 * time.Second,
  72                         }).Dial,
  73
  74                         TLSHandshakeTimeout: 4 * time.Second,
  75                 }
  76         }
  77 }
  78
  79 func (this *KeepClient) DiscoverKeepServers() (map[string]string, error) {
  80         type svcList struct {
  81                 Items []keepDisk `json:"items"`
  82         }
  83         var m svcList
  84
  85         err := this.Arvados.Call("GET", "keep_services", "", "accessible", nil, &m)
  86
  87         if err != nil {
  88                 if err := this.Arvados.List("keep_disks", nil, &m); err != nil {
  89                         return nil, err
  90                 }
  91         }
  92
  93         listed := make(map[string]bool)
  94         service_roots := make(map[string]string)
  95
  96         for _, element := range m.Items {
  97                 n := ""
  98
  99                 if element.SSL {
 100                         n = "s"
 101                 }
 102
 103                 // Construct server URL
 104                 url := fmt.Sprintf("http%s://%s:%d", n, element.Hostname, element.Port)
 105
 106                 // Skip duplicates
 107                 if !listed[url] {
 108                         listed[url] = true
 109                         service_roots[element.Uuid] = url
 110                 }
 111                 if element.SvcType == "proxy" {
 112                         this.Using_proxy = true
 113                 }
 114         }
 115
 116         if this.Using_proxy {
 117                 this.setClientSettingsProxy()
 118         } else {
 119                 this.setClientSettingsStore()
 120         }
 121
 122         this.SetServiceRoots(service_roots)
 123
 124         return service_roots, nil
 125 }
 126
 127 type uploadStatus struct {
 128         err             error
 129         url             string
 130         statusCode      int
 131         replicas_stored int
 132         response        string
 133 }
 134
 135 func (this KeepClient) uploadToKeepServer(host string, hash string, body io.ReadCloser,
 136         upload_status chan<- uploadStatus, expectedLength int64, requestId string) {
 137
 138         var req *http.Request
 139         var err error
 140         var url = fmt.Sprintf("%s/%s", host, hash)
 141         if req, err = http.NewRequest("PUT", url, nil); err != nil {
 142                 log.Printf("[%v] Error creating request PUT %v error: %v", requestId, url, err.Error())
 143                 upload_status <- uploadStatus{err, url, 0, 0, ""}
 144                 body.Close()
 145                 return
 146         }
 147
 148         req.ContentLength = expectedLength
 149         if expectedLength > 0 {
 150                 // http.Client.Do will close the body ReadCloser when it is
 151                 // done with it.
 152                 req.Body = body
 153         } else {
 154                 // "For client requests, a value of 0 means unknown if Body is
 155                 // not nil."  In this case we do want the body to be empty, so
 156                 // don't set req.Body.  However, we still need to close the
 157                 // body ReadCloser.
 158                 body.Close()
 159         }
 160
 161         req.Header.Add("Authorization", fmt.Sprintf("OAuth2 %s", this.Arvados.ApiToken))
 162         req.Header.Add("Content-Type", "application/octet-stream")
 163
 164         if this.Using_proxy {
 165                 req.Header.Add(X_Keep_Desired_Replicas, fmt.Sprint(this.Want_replicas))
 166         }
 167
 168         var resp *http.Response
 169         if resp, err = this.Client.Do(req); err != nil {
 170                 log.Printf("[%v] Upload failed %v error: %v", requestId, url, err.Error())
 171                 upload_status <- uploadStatus{err, url, 0, 0, ""}
 172                 return
 173         }
 174
 175         rep := 1
 176         if xr := resp.Header.Get(X_Keep_Replicas_Stored); xr != "" {
 177                 fmt.Sscanf(xr, "%d", &rep)
 178         }
 179
 180         defer resp.Body.Close()
 181         defer io.Copy(ioutil.Discard, resp.Body)
 182
 183         respbody, err2 := ioutil.ReadAll(&io.LimitedReader{resp.Body, 4096})
 184         response := strings.TrimSpace(string(respbody))
 185         if err2 != nil && err2 != io.EOF {
 186                 log.Printf("[%v] Upload %v error: %v response: %v", requestId, url, err2.Error(), response)
 187                 upload_status <- uploadStatus{err2, url, resp.StatusCode, rep, response}
 188         } else if resp.StatusCode == http.StatusOK {
 189                 log.Printf("[%v] Upload %v success", requestId, url)
 190                 upload_status <- uploadStatus{nil, url, resp.StatusCode, rep, response}
 191         } else {
 192                 log.Printf("[%v] Upload %v error: %v response: %v", requestId, url, resp.StatusCode, response)
 193                 upload_status <- uploadStatus{errors.New(resp.Status), url, resp.StatusCode, rep, response}
 194         }
 195 }
 196
 197 func (this KeepClient) putReplicas(
 198         hash string,
 199         tr *streamer.AsyncStream,
 200         expectedLength int64) (locator string, replicas int, err error) {
 201
 202         // Take the hash of locator and timestamp in order to identify this
 203         // specific transaction in log statements.
 204         requestId := fmt.Sprintf("%x", md5.Sum([]byte(locator+time.Now().String())))[0:8]
 205
 206         // Calculate the ordering for uploading to servers
 207         sv := NewRootSorter(this.ServiceRoots(), hash).GetSortedRoots()
 208
 209         // The next server to try contacting
 210         next_server := 0
 211
 212         // The number of active writers
 213         active := 0
 214
 215         // Used to communicate status from the upload goroutines
 216         upload_status := make(chan uploadStatus)
 217         defer close(upload_status)
 218
 219         // Desired number of replicas
 220         remaining_replicas := this.Want_replicas
 221
 222         for remaining_replicas > 0 {
 223                 for active < remaining_replicas {
 224                         // Start some upload requests
 225                         if next_server < len(sv) {
 226                                 log.Printf("[%v] Begin upload %s to %s", requestId, hash, sv[next_server])
 227                                 go this.uploadToKeepServer(sv[next_server], hash, tr.MakeStreamReader(), upload_status, expectedLength, requestId)
 228                                 next_server += 1
 229                                 active += 1
 230                         } else {
 231                                 if active == 0 {
 232                                         return locator, (this.Want_replicas - remaining_replicas), InsufficientReplicasError
 233                                 } else {
 234                                         break
 235                                 }
 236                         }
 237                 }
 238                 log.Printf("[%v] Replicas remaining to write: %v active uploads: %v",
 239                         requestId, remaining_replicas, active)
 240
 241                 // Now wait for something to happen.
 242                 status := <-upload_status
 243                 active -= 1
 244
 245                 if status.statusCode == 200 {
 246                         // good news!
 247                         remaining_replicas -= status.replicas_stored
 248                         locator = status.response
 249                 }
 250         }
 251
 252         return locator, this.Want_replicas, nil
 253 }