5824: Merge branch 'master' into 5824-keep-web

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

diff --git a/services/keepproxy/keepproxy.go b/services/keepproxy/keepproxy.go
index ebdb6eb376535060c72600c4144fad1cee097a85..1a1189658d7ba1473aa33036cce60276932cb9b8 100644 (file)
--- a/services/keepproxy/keepproxy.go
+++ b/services/keepproxy/keepproxy.go
@@ -15,6 +15,7 @@ import (
        "os"
        "os/signal"
        "reflect"
+       "regexp"
        "sync"
        "syscall"
        "time"
@@ -36,7 +37,7 @@ func main() {
                pidfile          string
        )
 
-       flagset := flag.NewFlagSet("default", flag.ExitOnError)
+       flagset := flag.NewFlagSet("keepproxy", flag.ExitOnError)
 
        flagset.StringVar(
                &listen,
@@ -200,7 +201,7 @@ 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, ""
@@ -240,6 +241,11 @@ type PutBlockHandler struct {
        *ApiTokenCache
 }
 
+type IndexHandler struct {
+       *keepclient.KeepClient
+       *ApiTokenCache
+}
+
 type InvalidPathHandler struct{}
 
 type OptionsHandler struct{}
@@ -261,6 +267,12 @@ func MakeRESTRouter(
                rest.Handle(`/{locator:[0-9a-f]{32}\+.*}`,
                        GetBlockHandler{kc, t}).Methods("GET", "HEAD")
                rest.Handle(`/{locator:[0-9a-f]{32}}`, GetBlockHandler{kc, t}).Methods("GET", "HEAD")
+
+               // List all blocks
+               rest.Handle(`/index`, IndexHandler{kc, t}).Methods("GET")
+
+               // List blocks whose hash has the given prefix
+               rest.Handle(`/index/{prefix:[0-9a-f]{0,32}}`, IndexHandler{kc, t}).Methods("GET")
        }
 
        if enable_put {
@@ -297,6 +309,8 @@ var BadAuthorizationHeader = errors.New("Missing or invalid Authorization header
 var ContentLengthMismatch = errors.New("Actual length != expected content length")
 var MethodNotSupported = errors.New("Method not supported")
 
+var removeHint, _ = regexp.Compile("\\+K@[a-z0-9]{5}(\\+|$)")
+
 func (this GetBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
        SetCorsHeaders(resp)
 
@@ -317,7 +331,7 @@ 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
        }
@@ -329,6 +343,8 @@ func (this GetBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
 
        var reader io.ReadCloser
 
+       locator = removeHint.ReplaceAllString(locator, "$1")
+
        switch req.Method {
        case "HEAD":
                expectLength, proxiedURI, err = kc.Ask(locator)
@@ -346,7 +362,7 @@ 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))
@@ -359,10 +375,16 @@ 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
        }
 }
 
@@ -416,7 +438,7 @@ 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
@@ -476,3 +498,63 @@ func (this PutBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Reques
                status = http.StatusBadGateway
        }
 }
+
+// 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
+//   Expects "complete" response (terminating with blank new line)
+//   Aborts on any errors
+// Concatenates responses from all those keep servers and returns
+func (handler IndexHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
+       SetCorsHeaders(resp)
+
+       prefix := mux.Vars(req)["prefix"]
+       var err error
+       var status int
+
+       defer func() {
+               if status != http.StatusOK {
+                       http.Error(resp, err.Error(), status)
+               }
+       }()
+
+       kc := *handler.KeepClient
+
+       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 = token
+       kc.Arvados = &arvclient
+
+       // Only GET method is supported
+       if req.Method != "GET" {
+               status, err = http.StatusNotImplemented, MethodNotSupported
+               return
+       }
+
+       // 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"))
+}