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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package grid
import (
"context"
"crypto/tls"
"fmt"
"net/http"
"runtime/debug"
"strings"
"github.com/gobwas/ws"
"github.com/gobwas/ws/wsutil"
"github.com/google/uuid"
"github.com/minio/madmin-go/v3"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/pubsub"
"github.com/minio/mux"
)
const (
// apiVersion is a major version of the entire api.
// Bumping this should only be done when overall,
// incompatible changes are made, not when adding a new handler
// or changing an existing handler.
apiVersion = "v1"
// RoutePath is the remote path to connect to.
RoutePath = "/minio/grid/" + apiVersion
)
// Manager will
type Manager struct {
// ID is an instance ID, that will change whenever the server restarts.
// This allows remotes to keep track of whether state is preserved.
ID uuid.UUID
// Immutable after creation, so no locks.
targets map[string]*Connection
// serverside handlers.
handlers handlers
local string
// Validate incoming requests.
authRequest func(r *http.Request) error
}
// ManagerOptions are options for creating a new grid manager.
type ManagerOptions struct {
Dialer ContextDialer // Outgoing dialer.
Local string // Local host name.
Hosts []string // All hosts, including local in the grid.
AddAuth AuthFn // Add authentication to the given audience.
AuthRequest func(r *http.Request) error // Validate incoming requests.
TLSConfig *tls.Config // TLS to apply to the connnections.
Incoming func(n int64) // Record incoming bytes.
Outgoing func(n int64) // Record outgoing bytes.
BlockConnect chan struct{} // If set, incoming and outgoing connections will be blocked until closed.
TraceTo *pubsub.PubSub[madmin.TraceInfo, madmin.TraceType]
}
// NewManager creates a new grid manager
func NewManager(ctx context.Context, o ManagerOptions) (*Manager, error) {
found := false
if o.AuthRequest == nil {
return nil, fmt.Errorf("grid: AuthRequest must be set")
}
m := &Manager{
ID: uuid.New(),
targets: make(map[string]*Connection, len(o.Hosts)),
local: o.Local,
authRequest: o.AuthRequest,
}
m.handlers.init()
if ctx == nil {
ctx = context.Background()
}
for _, host := range o.Hosts {
if host == o.Local {
if found {
return nil, fmt.Errorf("grid: local host found multiple times")
}
found = true
// No connection to local.
continue
}
m.targets[host] = newConnection(connectionParams{
ctx: ctx,
id: m.ID,
local: o.Local,
remote: host,
dial: o.Dialer,
handlers: &m.handlers,
auth: o.AddAuth,
blockConnect: o.BlockConnect,
tlsConfig: o.TLSConfig,
publisher: o.TraceTo,
})
}
if !found {
return nil, fmt.Errorf("grid: local host not found")
}
return m, nil
}
// AddToMux will add the grid manager to the given mux.
func (m *Manager) AddToMux(router *mux.Router) {
router.Handle(RoutePath, m.Handler())
}
// Handler returns a handler that can be used to serve grid requests.
// This should be connected on RoutePath to the main server.
func (m *Manager) Handler() http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
defer func() {
if debugPrint {
fmt.Printf("grid: Handler returning from: %v %v\n", req.Method, req.URL)
}
if r := recover(); r != nil {
debug.PrintStack()
fmt.Printf("grid: panic: %v\n", r)
w.WriteHeader(http.StatusInternalServerError)
}
}()
if debugPrint {
fmt.Printf("grid: Got a %s request for: %v\n", req.Method, req.URL)
}
if err := m.authRequest(req); err != nil {
fmt.Printf("grid: auth error: %v\n", err)
if debugPrint {
fmt.Printf("grid: auth error: %v\n", err)
}
w.WriteHeader(http.StatusForbidden)
return
}
ctx := req.Context()
conn, _, _, err := ws.UpgradeHTTP(req, w)
if err != nil {
if debugPrint {
fmt.Printf("grid: Unable to upgrade: %v. http.ResponseWriter is type %T\n", err, w)
}
w.WriteHeader(http.StatusUpgradeRequired)
return
}
defer conn.Close()
if debugPrint {
fmt.Printf("grid: Upgraded request: %v\n", req.URL)
}
msg, _, err := wsutil.ReadClientData(conn)
if err != nil {
logger.LogIf(ctx, fmt.Errorf("grid: reading connect: %w", err))
return
}
if debugPrint {
fmt.Printf("%s handler: Got message, length %v\n", m.local, len(msg))
}
var message message
_, _, err = message.parse(msg)
if err != nil {
if debugPrint {
fmt.Println("parse err:", err)
}
logger.LogIf(ctx, fmt.Errorf("handleMessages: parsing connect: %w", err))
return
}
if message.Op != OpConnect {
if debugPrint {
fmt.Println("op err:", message.Op)
}
logger.LogIf(ctx, fmt.Errorf("handler: unexpected op: %v", message.Op))
return
}
var cReq connectReq
_, err = cReq.UnmarshalMsg(message.Payload)
if err != nil {
if debugPrint {
fmt.Println("handler: creq err:", err)
}
logger.LogIf(ctx, fmt.Errorf("handleMessages: parsing ConnectReq: %w", err))
return
}
remote := m.targets[cReq.Host]
if remote == nil {
if debugPrint {
fmt.Printf("%s: handler: unknown host: %v. Have %v\n", m.local, cReq.Host, m.targets)
}
logger.LogIf(ctx, fmt.Errorf("handler: unknown host: %v", cReq.Host))
return
}
if debugPrint {
fmt.Printf("handler: Got Connect Req %+v\n", cReq)
}
logger.LogIf(ctx, remote.handleIncoming(ctx, conn, cReq))
}
}
// AuthFn should provide an authentication string for the given aud.
type AuthFn func(aud string) string
// Connection will return the connection for the specified host.
// If the host does not exist nil will be returned.
func (m *Manager) Connection(host string) *Connection {
return m.targets[host]
}
// RegisterSingleHandler will register a stateless handler that serves
// []byte -> ([]byte, error) requests.
// subroutes are joined with "/" to a single subroute.
func (m *Manager) RegisterSingleHandler(id HandlerID, h SingleHandlerFn, subroute ...string) error {
if !id.valid() {
return ErrUnknownHandler
}
s := strings.Join(subroute, "/")
if debugPrint {
fmt.Println("RegisterSingleHandler: ", id.String(), "subroute:", s)
}
if len(subroute) == 0 {
if m.handlers.hasAny(id) && !id.isTestHandler() {
return ErrHandlerAlreadyExists
}
m.handlers.single[id] = h
return nil
}
subID := makeSubHandlerID(id, s)
if m.handlers.hasSubhandler(subID) && !id.isTestHandler() {
return ErrHandlerAlreadyExists
}
m.handlers.subSingle[subID] = h
// Copy so clients can also pick it up for other subpaths.
m.handlers.subSingle[makeZeroSubHandlerID(id)] = h
return nil
}
/*
// RegisterStateless will register a stateless handler that serves
// []byte -> stream of ([]byte, error) requests.
func (m *Manager) RegisterStateless(id HandlerID, h StatelessHandler) error {
if !id.valid() {
return ErrUnknownHandler
}
if m.handlers.hasAny(id) && !id.isTestHandler() {
return ErrHandlerAlreadyExists
}
m.handlers.stateless[id] = &h
return nil
}
*/
// RegisterStreamingHandler will register a stateless handler that serves
// two-way streaming requests.
func (m *Manager) RegisterStreamingHandler(id HandlerID, h StreamHandler) error {
if !id.valid() {
return ErrUnknownHandler
}
if debugPrint {
fmt.Println("RegisterStreamingHandler: subroute:", h.Subroute)
}
if h.Subroute == "" {
if m.handlers.hasAny(id) && !id.isTestHandler() {
return ErrHandlerAlreadyExists
}
m.handlers.streams[id] = &h
return nil
}
subID := makeSubHandlerID(id, h.Subroute)
if m.handlers.hasSubhandler(subID) && !id.isTestHandler() {
return ErrHandlerAlreadyExists
}
m.handlers.subStreams[subID] = &h
// Copy so clients can also pick it up for other subpaths.
m.handlers.subStreams[makeZeroSubHandlerID(id)] = &h
return nil
}
// HostName returns the name of the local host.
func (m *Manager) HostName() string {
return m.local
}
// Targets returns the names of all remote targets.
func (m *Manager) Targets() []string {
var res []string
for k := range m.targets {
res = append(res, k)
}
return res
}
// TestingShutDown will shut down all connections.
// This should *only* be used by tests.
//
//lint:ignore U1000 This is used by tests.
func (m *Manager) debugMsg(d debugMsg, args ...any) {
for _, c := range m.targets {
c.debugMsg(d, args...)
}
}