+++ /dev/null
-package main
-
-import (
- "arvados.org/keepclient"
- "arvados.org/sdk"
- "flag"
- "fmt"
- "github.com/gorilla/mux"
- "io"
- "log"
- "net"
- "net/http"
- "os"
- "os/signal"
- "sync"
- "syscall"
- "time"
-)
-
-// Default TCP address on which to listen for requests.
-// Initialized by the -listen flag.
-const DEFAULT_ADDR = ":25107"
-
-var listener net.Listener
-
-func main() {
- var (
- listen string
- no_get bool
- no_put bool
- default_replicas int
- pidfile string
- )
-
- flagset := flag.NewFlagSet("default", flag.ExitOnError)
-
- flagset.StringVar(
- &listen,
- "listen",
- DEFAULT_ADDR,
- "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.StringVar(
- &pidfile,
- "pid",
- "",
- "Path to write pid file")
-
- flagset.Parse(os.Args[1:])
-
- arv, err := sdk.MakeArvadosClient()
- if err != nil {
- log.Fatalf("Error setting up arvados client %s", err.Error())
- }
-
- 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 {
- fmt.Fprint(f, os.Getpid())
- f.Close()
- } else {
- log.Printf("Error writing pid file (%s): %s", pidfile, err.Error())
- }
- }
-
- kc.Want_replicas = default_replicas
-
- listener, err = net.Listen("tcp", listen)
- if err != nil {
- log.Fatalf("Could not listen on %v", listen)
- }
-
- go RefreshServicesList(&kc)
-
- // 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)
-
- if pidfile != "" {
- f, err := os.Create(pidfile)
- if err == nil {
- fmt.Fprint(f, os.Getpid())
- f.Close()
- } else {
- log.Printf("Error writing pid file (%s): %s", pidfile, err.Error())
- }
- }
-
- log.Printf("Arvados Keep proxy started listening on %v with server list %v", listener.Addr(), kc.ServiceRoots())
-
- // Start listening for requests.
- http.Serve(listener, MakeRESTRouter(!no_get, !no_put, &kc))
-
- log.Println("shutting down")
-
- if pidfile != "" {
- os.Remove(pidfile)
- }
-}
-
-type ApiTokenCache struct {
- tokens map[string]int64
- lock sync.Mutex
- expireTime int64
-}
-
-// Refresh the keep service list every five minutes.
-func RefreshServicesList(kc *keepclient.KeepClient) {
- for {
- time.Sleep(300 * time.Second)
- oldservices := kc.ServiceRoots()
- kc.DiscoverKeepServers()
- newservices := kc.ServiceRoots()
- s1 := fmt.Sprint(oldservices)
- s2 := fmt.Sprint(newservices)
- if s1 != s2 {
- log.Printf("Updated server list to %v", s2)
- }
- }
-}
-
-// 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 realip := req.Header.Get("X-Real-IP"); realip != "" {
- if forwarded := req.Header.Get("X-Forwarded-For"); forwarded != realip {
- return fmt.Sprintf("%s (X-Forwarded-For %s)", realip, forwarded)
- } else {
- return realip
- }
- }
- 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 circut
- 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 InvalidPathHandler 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(`/{hash:[0-9a-f]{32}}+{hints}`,
- GetBlockHandler{kc, t}).Methods("GET", "HEAD")
- rest.Handle(`/{hash:[0-9a-f]{32}}`, GetBlockHandler{kc, t}).Methods("GET", "HEAD")
- }
-
- if enable_put {
- rest.Handle(`/{hash:[0-9a-f]{32}}+{hints}`, PutBlockHandler{kc, t}).Methods("PUT")
- rest.Handle(`/{hash:[0-9a-f]{32}}`, PutBlockHandler{kc, t}).Methods("PUT")
- }
-
- rest.NotFoundHandler = InvalidPathHandler{}
-
- return rest
-}
-
-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 GetBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
-
- kc := *this.KeepClient
-
- hash := mux.Vars(req)["hash"]
- hints := mux.Vars(req)["hints"]
-
- locator := keepclient.MakeLocator2(hash, hints)
-
- log.Printf("%s: %s %s", GetRemoteAddress(req), req.Method, hash)
-
- var pass bool
- var tok string
- if pass, tok = CheckAuthorizationHeader(kc, this.ApiTokenCache, req); !pass {
- http.Error(resp, "Missing or invalid Authorization header", http.StatusForbidden)
- return
- }
-
- // Copy ArvadosClient struct and use the client's API token
- arvclient := *kc.Arvados
- arvclient.ApiToken = tok
- kc.Arvados = &arvclient
-
- var reader io.ReadCloser
- var err error
- var blocklen int64
-
- if req.Method == "GET" {
- reader, blocklen, _, err = kc.AuthorizedGet(hash, locator.Signature, locator.Timestamp)
- defer reader.Close()
- } else if req.Method == "HEAD" {
- blocklen, _, err = kc.AuthorizedAsk(hash, locator.Signature, locator.Timestamp)
- }
-
- if blocklen > 0 {
- resp.Header().Set("Content-Length", fmt.Sprint(blocklen))
- }
-
- switch err {
- case nil:
- if reader != nil {
- n, err2 := io.Copy(resp, reader)
- if n != blocklen {
- log.Printf("%s: %s %s mismatched return %v with Content-Length %v error %v", GetRemoteAddress(req), req.Method, hash, n, blocklen, err2)
- } else if err2 == nil {
- log.Printf("%s: %s %s success returned %v bytes", GetRemoteAddress(req), req.Method, hash, n)
- } else {
- log.Printf("%s: %s %s returned %v bytes error %v", GetRemoteAddress(req), req.Method, hash, n, err.Error())
- }
- } else {
- log.Printf("%s: %s %s success", GetRemoteAddress(req), req.Method, hash)
- }
- case keepclient.BlockNotFound:
- http.Error(resp, "Not found", http.StatusNotFound)
- default:
- http.Error(resp, err.Error(), http.StatusBadGateway)
- }
-
- if err != nil {
- log.Printf("%s: %s %s error %s", GetRemoteAddress(req), req.Method, hash, err.Error())
- }
-}
-
-func (this PutBlockHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
-
- kc := *this.KeepClient
-
- hash := mux.Vars(req)["hash"]
- hints := mux.Vars(req)["hints"]
-
- locator := keepclient.MakeLocator2(hash, hints)
-
- var contentLength int64 = -1
- if req.Header.Get("Content-Length") != "" {
- _, err := fmt.Sscanf(req.Header.Get("Content-Length"), "%d", &contentLength)
- if err != nil {
- resp.Header().Set("Content-Length", fmt.Sprintf("%d", contentLength))
- }
-
- }
-
- log.Printf("%s: %s %s Content-Length %v", GetRemoteAddress(req), req.Method, hash, contentLength)
-
- if contentLength < 1 {
- http.Error(resp, "Must include Content-Length header", http.StatusLengthRequired)
- return
- }
-
- if locator.Size > 0 && int64(locator.Size) != contentLength {
- http.Error(resp, "Locator size hint does not match Content-Length header", http.StatusBadRequest)
- return
- }
-
- var pass bool
- var tok string
- if pass, tok = CheckAuthorizationHeader(kc, this.ApiTokenCache, req); !pass {
- http.Error(resp, "Missing or invalid Authorization header", 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
- hash, replicas, err := kc.PutHR(hash, req.Body, contentLength)
-
- // Tell the client how many successful PUTs we accomplished
- resp.Header().Set(keepclient.X_Keep_Replicas_Stored, fmt.Sprintf("%d", replicas))
-
- switch err {
- case nil:
- // Default will return http.StatusOK
- log.Printf("%s: %s %s finished, stored %v replicas (desired %v)", GetRemoteAddress(req), req.Method, hash, replicas, kc.Want_replicas)
- n, err2 := io.WriteString(resp, hash)
- if err2 != nil {
- log.Printf("%s: wrote %v bytes to response body and got error %v", n, err2.Error())
- }
-
- case keepclient.OversizeBlockError:
- // Too much data
- http.Error(resp, fmt.Sprintf("Exceeded maximum blocksize %d", keepclient.BLOCKSIZE), http.StatusRequestEntityTooLarge)
-
- case keepclient.InsufficientReplicasError:
- if replicas > 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.
- // Default will return http.StatusOK
- n, err2 := io.WriteString(resp, hash)
- if err2 != nil {
- log.Printf("%s: wrote %v bytes to response body and got error %v", n, err2.Error())
- }
- } else {
- http.Error(resp, "", http.StatusServiceUnavailable)
- }
-
- default:
- http.Error(resp, err.Error(), http.StatusBadGateway)
- }
-
- if err != nil {
- log.Printf("%s: %s %s stored %v replicas (desired %v) got error %v", GetRemoteAddress(req), req.Method, hash, replicas, kc.Want_replicas, err.Error())
- }
-
-}
projects / arvados.git / blobdiff