// Copyright (C) The Arvados Authors. All rights reserved. // // SPDX-License-Identifier: AGPL-3.0 package controller import ( "context" "database/sql" "errors" "fmt" "net/http" "net/url" "strings" "sync" "time" "git.arvados.org/arvados.git/lib/controller/federation" "git.arvados.org/arvados.git/lib/controller/railsproxy" "git.arvados.org/arvados.git/lib/controller/router" "git.arvados.org/arvados.git/sdk/go/arvados" "git.arvados.org/arvados.git/sdk/go/health" "git.arvados.org/arvados.git/sdk/go/httpserver" _ "github.com/lib/pq" ) type Handler struct { Cluster *arvados.Cluster setupOnce sync.Once handlerStack http.Handler proxy *proxy secureClient *http.Client insecureClient *http.Client pgdb *sql.DB pgdbMtx sync.Mutex } func (h *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) { h.setupOnce.Do(h.setup) if req.Method != "GET" && req.Method != "HEAD" { // http.ServeMux returns 301 with a cleaned path if // the incoming request has a double slash. Some // clients (including the Go standard library) change // the request method to GET when following a 301 // redirect if the original method was not HEAD // (RFC7231 6.4.2 specifically allows this in the case // of POST). Thus "POST //foo" gets misdirected to // "GET /foo". To avoid this, eliminate double slashes // before passing the request to ServeMux. for strings.Contains(req.URL.Path, "//") { req.URL.Path = strings.Replace(req.URL.Path, "//", "/", -1) } } if h.Cluster.API.RequestTimeout > 0 { ctx, cancel := context.WithDeadline(req.Context(), time.Now().Add(time.Duration(h.Cluster.API.RequestTimeout))) req = req.WithContext(ctx) defer cancel() } h.handlerStack.ServeHTTP(w, req) } func (h *Handler) CheckHealth() error { h.setupOnce.Do(h.setup) _, _, err := railsproxy.FindRailsAPI(h.Cluster) return err } func neverRedirect(*http.Request, []*http.Request) error { return http.ErrUseLastResponse } func (h *Handler) setup() { mux := http.NewServeMux() mux.Handle("/_health/", &health.Handler{ Token: h.Cluster.ManagementToken, Prefix: "/_health/", Routes: health.Routes{"ping": func() error { _, err := h.db(&http.Request{}); return err }}, }) rtr := router.New(federation.New(h.Cluster)) mux.Handle("/arvados/v1/config", rtr) if !h.Cluster.ForceLegacyAPI14 { mux.Handle("/arvados/v1/collections", rtr) mux.Handle("/arvados/v1/collections/", rtr) mux.Handle("/arvados/v1/users", rtr) mux.Handle("/arvados/v1/users/", rtr) mux.Handle("/login", rtr) mux.Handle("/logout", rtr) } hs := http.NotFoundHandler() hs = prepend(hs, h.proxyRailsAPI) hs = h.setupProxyRemoteCluster(hs) mux.Handle("/", hs) h.handlerStack = mux sc := *arvados.DefaultSecureClient sc.CheckRedirect = neverRedirect h.secureClient = &sc ic := *arvados.InsecureHTTPClient ic.CheckRedirect = neverRedirect h.insecureClient = &ic h.proxy = &proxy{ Name: "arvados-controller", } } var errDBConnection = errors.New("database connection error") func (h *Handler) db(req *http.Request) (*sql.DB, error) { h.pgdbMtx.Lock() defer h.pgdbMtx.Unlock() if h.pgdb != nil { return h.pgdb, nil } db, err := sql.Open("postgres", h.Cluster.PostgreSQL.Connection.String()) if err != nil { httpserver.Logger(req).WithError(err).Error("postgresql connect failed") return nil, errDBConnection } if p := h.Cluster.PostgreSQL.ConnectionPool; p > 0 { db.SetMaxOpenConns(p) } if err := db.Ping(); err != nil { httpserver.Logger(req).WithError(err).Error("postgresql connect succeeded but ping failed") return nil, errDBConnection } h.pgdb = db return db, nil } type middlewareFunc func(http.ResponseWriter, *http.Request, http.Handler) func prepend(next http.Handler, middleware middlewareFunc) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { middleware(w, req, next) }) } func (h *Handler) localClusterRequest(req *http.Request) (*http.Response, error) { urlOut, insecure, err := railsproxy.FindRailsAPI(h.Cluster) if err != nil { return nil, err } urlOut = &url.URL{ Scheme: urlOut.Scheme, Host: urlOut.Host, Path: req.URL.Path, RawPath: req.URL.RawPath, RawQuery: req.URL.RawQuery, } client := h.secureClient if insecure { client = h.insecureClient } return h.proxy.Do(req, urlOut, client) } func (h *Handler) proxyRailsAPI(w http.ResponseWriter, req *http.Request, next http.Handler) { resp, err := h.localClusterRequest(req) n, err := h.proxy.ForwardResponse(w, resp, err) if err != nil { httpserver.Logger(req).WithError(err).WithField("bytesCopied", n).Error("error copying response body") } } // Use a localhost entry from Services.RailsAPI.InternalURLs if one is // present, otherwise choose an arbitrary entry. func findRailsAPI(cluster *arvados.Cluster) (*url.URL, bool, error) { var best *url.URL for target := range cluster.Services.RailsAPI.InternalURLs { target := url.URL(target) best = &target if strings.HasPrefix(target.Host, "localhost:") || strings.HasPrefix(target.Host, "127.0.0.1:") || strings.HasPrefix(target.Host, "[::1]:") { break } } if best == nil { return nil, false, fmt.Errorf("Services.RailsAPI.InternalURLs is empty") } return best, cluster.TLS.Insecure, nil }