Merge branch 'master' into 7661-fuse-by-pdh

[arvados.git] / services / keepproxy / keepproxy.go

diff --git a/services/keepproxy/keepproxy.go b/services/keepproxy/keepproxy.go
index 865212d747691f6423e5b1701575f15206f2abd4..79ed51eb0e00f57eb38d4a31251a87c2bc5e866c 100644 (file)
--- a/services/keepproxy/keepproxy.go
+++ b/services/keepproxy/keepproxy.go
@@ -16,7 +16,6 @@ import (
        "os/signal"
        "reflect"
        "regexp"
-       "strings"
        "sync"
        "syscall"
        "time"
@@ -38,7 +37,7 @@ func main() {
                pidfile          string
        )
 
-       flagset := flag.NewFlagSet("default", flag.ExitOnError)
+       flagset := flag.NewFlagSet("keepproxy", flag.ExitOnError)
 
        flagset.StringVar(
                &listen,
@@ -85,6 +84,9 @@ func main() {
                log.Fatalf("Error setting up arvados client %s", err.Error())
        }
 
+       if os.Getenv("ARVADOS_DEBUG") != "" {
+               keepclient.DebugPrintf = log.Printf
+       }
        kc, err := keepclient.MakeKeepClient(&arv)
        if err != nil {
                log.Fatalf("Error setting up keep client %s", err.Error())
@@ -202,7 +204,7 @@ func GetRemoteAddress(req *http.Request) string {
        return req.RemoteAddr
 }
 
-func CheckAuthorizationHeader(kc keepclient.KeepClient, cache *ApiTokenCache, req *http.Request) (pass bool, tok string) {
+func CheckAuthorizationHeader(kc *keepclient.KeepClient, cache *ApiTokenCache, req *http.Request) (pass bool, tok string) {
        var auth string
        if auth = req.Header.Get("Authorization"); auth == "" {
                return false, ""
@@ -332,7 +334,7 @@ func (this GetBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
 
        var pass bool
        var tok string
-       if pass, tok = CheckAuthorizationHeader(kc, this.ApiTokenCache, req); !pass {
+       if pass, tok = CheckAuthorizationHeader(&kc, this.ApiTokenCache, req); !pass {
                status, err = http.StatusForbidden, BadAuthorizationHeader
                return
        }
@@ -363,7 +365,7 @@ func (this GetBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
                log.Println("Warning:", GetRemoteAddress(req), req.Method, proxiedURI, "Content-Length not provided")
        }
 
-       switch err {
+       switch respErr := err.(type) {
        case nil:
                status = http.StatusOK
                resp.Header().Set("Content-Length", fmt.Sprint(expectLength))
@@ -376,10 +378,16 @@ func (this GetBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
                                err = ContentLengthMismatch
                        }
                }
-       case keepclient.BlockNotFound:
-               status = http.StatusNotFound
+       case keepclient.Error:
+               if respErr == keepclient.BlockNotFound {
+                       status = http.StatusNotFound
+               } else if respErr.Temporary() {
+                       status = http.StatusBadGateway
+               } else {
+                       status = 422
+               }
        default:
-               status = http.StatusBadGateway
+               status = http.StatusInternalServerError
        }
 }
 
@@ -433,7 +441,7 @@ func (this PutBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
 
        var pass bool
        var tok string
-       if pass, tok = CheckAuthorizationHeader(kc, this.ApiTokenCache, req); !pass {
+       if pass, tok = CheckAuthorizationHeader(&kc, this.ApiTokenCache, req); !pass {
                err = BadAuthorizationHeader
                status = http.StatusForbidden
                return
@@ -494,7 +502,7 @@ func (this PutBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
        }
 }
 
-// ServeHTTP implemenation for IndexHandler
+// ServeHTTP implementation for IndexHandler
 // Supports only GET requests for /index/{prefix:[0-9a-f]{0,32}}
 // For each keep server found in LocalRoots:
 //   Invokes GetIndex using keepclient
@@ -516,59 +524,40 @@ func (handler IndexHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
 
        kc := *handler.KeepClient
 
-       var pass bool
-       var tok string
-       if pass, tok = CheckAuthorizationHeader(kc, handler.ApiTokenCache, req); !pass {
+       ok, token := CheckAuthorizationHeader(&kc, handler.ApiTokenCache, req)
+       if !ok {
                status, err = http.StatusForbidden, BadAuthorizationHeader
                return
        }
 
        // Copy ArvadosClient struct and use the client's API token
        arvclient := *kc.Arvados
-       arvclient.ApiToken = tok
+       arvclient.ApiToken = token
        kc.Arvados = &arvclient
 
-       var indexResp []byte
-       var reader io.Reader
-
-       switch req.Method {
-       case "GET":
-               for uuid := range kc.LocalRoots() {
-                       reader, err = kc.GetIndex(uuid, prefix)
-                       if err != nil {
-                               break
-                       }
-
-                       var readBytes []byte
-                       readBytes, err = ioutil.ReadAll(reader)
-                       if err != nil {
-                               break
-                       }
-
-                       // Got index; verify that it is complete
-                       // The response should be "\n" if no locators matched the prefix
-                       // Else, it should be a list of locators followed by a blank line
-                       if (!strings.HasSuffix(string(readBytes), "\n\n")) && (string(readBytes) != "\n") {
-                               err = errors.New("Got incomplete index")
-                       }
-
-                       // Trim the extra empty new line found in response from each server
-                       indexResp = append(indexResp, (readBytes[0 : len(readBytes)-1])...)
-               }
-
-               // Append empty line at the end of concatenation of all server responses
-               indexResp = append(indexResp, ([]byte("\n"))...)
-       default:
+       // Only GET method is supported
+       if req.Method != "GET" {
                status, err = http.StatusNotImplemented, MethodNotSupported
                return
        }
 
-       switch err {
-       case nil:
-               status = http.StatusOK
-               resp.Header().Set("Content-Length", fmt.Sprint(len(indexResp)))
-               _, err = resp.Write(indexResp)
-       default:
-               status = http.StatusBadGateway
+       // Get index from all LocalRoots and write to resp
+       var reader io.Reader
+       for uuid := range kc.LocalRoots() {
+               reader, err = kc.GetIndex(uuid, prefix)
+               if err != nil {
+                       status = http.StatusBadGateway
+                       return
+               }
+
+               _, err = io.Copy(resp, reader)
+               if err != nil {
+                       status = http.StatusBadGateway
+                       return
+               }
        }
+
+       // Got index from all the keep servers and wrote to resp
+       status = http.StatusOK
+       resp.Write([]byte("\n"))
 }