package main import ( "errors" "flag" "fmt" "git.curoverse.com/arvados.git/sdk/go/arvadosclient" "git.curoverse.com/arvados.git/sdk/go/keepclient" "github.com/gorilla/mux" "io" "io/ioutil" "log" "net" "net/http" "os" "os/signal" "regexp" "sync" "syscall" "time" ) // Default TCP address on which to listen for requests. // Override with -listen. const DefaultAddr = ":25107" var listener net.Listener func main() { var ( listen string no_get bool no_put bool default_replicas int timeout int64 pidfile string ) flagset := flag.NewFlagSet("keepproxy", flag.ExitOnError) flagset.StringVar( &listen, "listen", DefaultAddr, "Interface on which to listen for requests, in the format "+ "ipaddr:port. e.g. -listen=10.0.1.24:8000. Use -listen=:port "+ "to listen on all network interfaces.") flagset.BoolVar( &no_get, "no-get", false, "If set, disable GET operations") flagset.BoolVar( &no_put, "no-put", false, "If set, disable PUT operations") flagset.IntVar( &default_replicas, "default-replicas", 2, "Default number of replicas to write if not specified by the client.") flagset.Int64Var( &timeout, "timeout", 15, "Timeout on requests to internal Keep services (default 15 seconds)") flagset.StringVar( &pidfile, "pid", "", "Path to write pid file") flagset.Parse(os.Args[1:]) arv, err := arvadosclient.MakeArvadosClient() if err != nil { 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()) } if pidfile != "" { f, err := os.Create(pidfile) if err != nil { log.Fatalf("Error writing pid file (%s): %s", pidfile, err.Error()) } fmt.Fprint(f, os.Getpid()) f.Close() defer os.Remove(pidfile) } kc.Want_replicas = default_replicas kc.Client.Timeout = time.Duration(timeout) * time.Second go kc.RefreshServices(5*time.Minute, 3*time.Second) listener, err = net.Listen("tcp", listen) if err != nil { log.Fatalf("Could not listen on %v", listen) } log.Printf("Arvados Keep proxy started listening on %v", listener.Addr()) // Shut down the server gracefully (by closing the listener) // if SIGTERM is received. term := make(chan os.Signal, 1) go func(sig <-chan os.Signal) { s := <-sig log.Println("caught signal:", s) listener.Close() }(term) signal.Notify(term, syscall.SIGTERM) signal.Notify(term, syscall.SIGINT) // Start serving requests. http.Serve(listener, MakeRESTRouter(!no_get, !no_put, kc)) log.Println("shutting down") } type ApiTokenCache struct { tokens map[string]int64 lock sync.Mutex expireTime int64 } // Cache the token and set an expire time. If we already have an expire time // on the token, it is not updated. func (this *ApiTokenCache) RememberToken(token string) { this.lock.Lock() defer this.lock.Unlock() now := time.Now().Unix() if this.tokens[token] == 0 { this.tokens[token] = now + this.expireTime } } // Check if the cached token is known and still believed to be valid. func (this *ApiTokenCache) RecallToken(token string) bool { this.lock.Lock() defer this.lock.Unlock() now := time.Now().Unix() if this.tokens[token] == 0 { // Unknown token return false } else if now < this.tokens[token] { // Token is known and still valid return true } else { // Token is expired this.tokens[token] = 0 return false } } func GetRemoteAddress(req *http.Request) string { if xff := req.Header.Get("X-Forwarded-For"); xff != "" { return xff + "," + req.RemoteAddr } return req.RemoteAddr } 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, "" } _, err := fmt.Sscanf(auth, "OAuth2 %s", &tok) if err != nil { // Scanning error return false, "" } if cache.RecallToken(tok) { // Valid in the cache, short circuit return true, tok } arv := *kc.Arvados arv.ApiToken = tok if err := arv.Call("HEAD", "users", "", "current", nil, nil); err != nil { log.Printf("%s: CheckAuthorizationHeader error: %v", GetRemoteAddress(req), err) return false, "" } // Success! Update cache cache.RememberToken(tok) return true, tok } type GetBlockHandler struct { *keepclient.KeepClient *ApiTokenCache } type PutBlockHandler struct { *keepclient.KeepClient *ApiTokenCache } type IndexHandler struct { *keepclient.KeepClient *ApiTokenCache } type InvalidPathHandler struct{} type OptionsHandler struct{} // MakeRESTRouter // Returns a mux.Router that passes GET and PUT requests to the // appropriate handlers. // func MakeRESTRouter( enable_get bool, enable_put bool, kc *keepclient.KeepClient) *mux.Router { t := &ApiTokenCache{tokens: make(map[string]int64), expireTime: 300} rest := mux.NewRouter() if enable_get { 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 { rest.Handle(`/{locator:[0-9a-f]{32}\+.*}`, PutBlockHandler{kc, t}).Methods("PUT") rest.Handle(`/{locator:[0-9a-f]{32}}`, PutBlockHandler{kc, t}).Methods("PUT") rest.Handle(`/`, PutBlockHandler{kc, t}).Methods("POST") rest.Handle(`/{any}`, OptionsHandler{}).Methods("OPTIONS") rest.Handle(`/`, OptionsHandler{}).Methods("OPTIONS") } rest.NotFoundHandler = InvalidPathHandler{} return rest } func SetCorsHeaders(resp http.ResponseWriter) { resp.Header().Set("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, OPTIONS") resp.Header().Set("Access-Control-Allow-Origin", "*") resp.Header().Set("Access-Control-Allow-Headers", "Authorization, Content-Length, Content-Type, X-Keep-Desired-Replicas") resp.Header().Set("Access-Control-Max-Age", "86486400") } func (this InvalidPathHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) { log.Printf("%s: %s %s unroutable", GetRemoteAddress(req), req.Method, req.URL.Path) http.Error(resp, "Bad request", http.StatusBadRequest) } func (this OptionsHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) { log.Printf("%s: %s %s", GetRemoteAddress(req), req.Method, req.URL.Path) SetCorsHeaders(resp) } 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) locator := mux.Vars(req)["locator"] var err error var status int var expectLength, responseLength int64 var proxiedURI = "-" defer func() { log.Println(GetRemoteAddress(req), req.Method, req.URL.Path, status, expectLength, responseLength, proxiedURI, err) if status != http.StatusOK { http.Error(resp, err.Error(), status) } }() kc := *this.KeepClient var pass bool var tok string if pass, tok = CheckAuthorizationHeader(&kc, this.ApiTokenCache, req); !pass { status, err = http.StatusForbidden, BadAuthorizationHeader return } // Copy ArvadosClient struct and use the client's API token arvclient := *kc.Arvados arvclient.ApiToken = tok kc.Arvados = &arvclient var reader io.ReadCloser locator = removeHint.ReplaceAllString(locator, "$1") switch req.Method { case "HEAD": expectLength, proxiedURI, err = kc.Ask(locator) case "GET": reader, expectLength, proxiedURI, err = kc.Get(locator) if reader != nil { defer reader.Close() } default: status, err = http.StatusNotImplemented, MethodNotSupported return } if expectLength == -1 { log.Println("Warning:", GetRemoteAddress(req), req.Method, proxiedURI, "Content-Length not provided") } switch respErr := err.(type) { case nil: status = http.StatusOK resp.Header().Set("Content-Length", fmt.Sprint(expectLength)) switch req.Method { case "HEAD": responseLength = 0 case "GET": responseLength, err = io.Copy(resp, reader) if err == nil && expectLength > -1 && responseLength != expectLength { err = ContentLengthMismatch } } case keepclient.Error: if respErr == keepclient.BlockNotFound { status = http.StatusNotFound } else if respErr.Temporary() { status = http.StatusBadGateway } else { status = 422 } default: status = http.StatusInternalServerError } } var LengthRequiredError = errors.New(http.StatusText(http.StatusLengthRequired)) var LengthMismatchError = errors.New("Locator size hint does not match Content-Length header") func (this PutBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) { SetCorsHeaders(resp) kc := *this.KeepClient var err error var expectLength int64 var status = http.StatusInternalServerError var wroteReplicas int var locatorOut string = "-" defer func() { log.Println(GetRemoteAddress(req), req.Method, req.URL.Path, status, expectLength, kc.Want_replicas, wroteReplicas, locatorOut, err) if status != http.StatusOK { http.Error(resp, err.Error(), status) } }() locatorIn := mux.Vars(req)["locator"] _, err = fmt.Sscanf(req.Header.Get("Content-Length"), "%d", &expectLength) if err != nil || expectLength < 0 { err = LengthRequiredError status = http.StatusLengthRequired return } if locatorIn != "" { var loc *keepclient.Locator if loc, err = keepclient.MakeLocator(locatorIn); err != nil { status = http.StatusBadRequest return } else if loc.Size > 0 && int64(loc.Size) != expectLength { err = LengthMismatchError status = http.StatusBadRequest return } } var pass bool var tok string if pass, tok = CheckAuthorizationHeader(&kc, this.ApiTokenCache, req); !pass { err = BadAuthorizationHeader status = http.StatusForbidden return } // Copy ArvadosClient struct and use the client's API token arvclient := *kc.Arvados arvclient.ApiToken = tok kc.Arvados = &arvclient // Check if the client specified the number of replicas if req.Header.Get("X-Keep-Desired-Replicas") != "" { var r int _, err := fmt.Sscanf(req.Header.Get(keepclient.X_Keep_Desired_Replicas), "%d", &r) if err == nil { kc.Want_replicas = r } } // Now try to put the block through if locatorIn == "" { if bytes, err := ioutil.ReadAll(req.Body); err != nil { err = errors.New(fmt.Sprintf("Error reading request body: %s", err)) status = http.StatusInternalServerError return } else { locatorOut, wroteReplicas, err = kc.PutB(bytes) } } else { locatorOut, wroteReplicas, err = kc.PutHR(locatorIn, req.Body, expectLength) } // Tell the client how many successful PUTs we accomplished resp.Header().Set(keepclient.X_Keep_Replicas_Stored, fmt.Sprintf("%d", wroteReplicas)) switch err { case nil: status = http.StatusOK _, err = io.WriteString(resp, locatorOut) case keepclient.OversizeBlockError: // Too much data status = http.StatusRequestEntityTooLarge case keepclient.InsufficientReplicasError: if wroteReplicas > 0 { // At least one write is considered success. The // client can decide if getting less than the number of // replications it asked for is a fatal error. status = http.StatusOK _, err = io.WriteString(resp, locatorOut) } else { status = http.StatusServiceUnavailable } default: 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")) }