| 1 | package soju
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| 2 |
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| 3 | import (
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| 4 | "fmt"
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| 5 | "time"
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| 6 |
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| 7 | "gopkg.in/irc.v3"
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| 8 | )
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| 9 |
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| 10 | type event interface{}
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| 11 |
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| 12 | type eventUpstreamMessage struct {
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| 13 | msg *irc.Message
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| 14 | uc *upstreamConn
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| 15 | }
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| 16 |
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| 17 | type eventUpstreamConnectionError struct {
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| 18 | net *network
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| 19 | err error
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| 20 | }
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| 21 |
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| 22 | type eventUpstreamConnected struct {
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| 23 | uc *upstreamConn
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| 24 | }
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| 25 |
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| 26 | type eventUpstreamDisconnected struct {
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| 27 | uc *upstreamConn
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| 28 | }
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| 29 |
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| 30 | type eventUpstreamError struct {
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| 31 | uc *upstreamConn
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| 32 | err error
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| 33 | }
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| 34 |
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| 35 | type eventDownstreamMessage struct {
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| 36 | msg *irc.Message
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| 37 | dc *downstreamConn
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| 38 | }
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| 39 |
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| 40 | type eventDownstreamConnected struct {
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| 41 | dc *downstreamConn
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| 42 | }
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| 43 |
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| 44 | type eventDownstreamDisconnected struct {
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| 45 | dc *downstreamConn
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| 46 | }
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| 47 |
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| 48 | type eventStop struct{}
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| 49 |
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| 50 | type networkHistory struct {
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| 51 | offlineClients map[string]uint64 // indexed by client name
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| 52 | ring *Ring // can be nil if there are no offline clients
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| 53 | }
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| 54 |
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| 55 | type network struct {
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| 56 | Network
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| 57 | user *user
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| 58 | stopped chan struct{}
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| 59 |
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| 60 | conn *upstreamConn
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| 61 | channels map[string]*Channel
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| 62 | history map[string]*networkHistory // indexed by entity
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| 63 | offlineClients map[string]struct{} // indexed by client name
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| 64 | lastError error
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| 65 | }
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| 66 |
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| 67 | func newNetwork(user *user, record *Network, channels []Channel) *network {
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| 68 | m := make(map[string]*Channel, len(channels))
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| 69 | for _, ch := range channels {
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| 70 | ch := ch
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| 71 | m[ch.Name] = &ch
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| 72 | }
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| 73 |
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| 74 | return &network{
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| 75 | Network: *record,
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| 76 | user: user,
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| 77 | stopped: make(chan struct{}),
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| 78 | channels: m,
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| 79 | history: make(map[string]*networkHistory),
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| 80 | offlineClients: make(map[string]struct{}),
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| 81 | }
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| 82 | }
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| 83 |
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| 84 | func (net *network) forEachDownstream(f func(*downstreamConn)) {
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| 85 | net.user.forEachDownstream(func(dc *downstreamConn) {
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| 86 | if dc.network != nil && dc.network != net {
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| 87 | return
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| 88 | }
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| 89 | f(dc)
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| 90 | })
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| 91 | }
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| 92 |
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| 93 | func (net *network) isStopped() bool {
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| 94 | select {
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| 95 | case <-net.stopped:
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| 96 | return true
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| 97 | default:
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| 98 | return false
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | func (net *network) run() {
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| 103 | var lastTry time.Time
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| 104 | for {
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| 105 | if net.isStopped() {
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| 106 | return
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| 107 | }
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| 108 |
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| 109 | if dur := time.Now().Sub(lastTry); dur < retryConnectMinDelay {
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| 110 | delay := retryConnectMinDelay - dur
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| 111 | net.user.srv.Logger.Printf("waiting %v before trying to reconnect to %q", delay.Truncate(time.Second), net.Addr)
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| 112 | time.Sleep(delay)
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| 113 | }
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| 114 | lastTry = time.Now()
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| 115 |
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| 116 | uc, err := connectToUpstream(net)
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| 117 | if err != nil {
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| 118 | net.user.srv.Logger.Printf("failed to connect to upstream server %q: %v", net.Addr, err)
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| 119 | net.user.events <- eventUpstreamConnectionError{net, fmt.Errorf("failed to connect: %v", err)}
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| 120 | continue
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| 121 | }
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| 122 |
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| 123 | uc.register()
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| 124 | if err := uc.runUntilRegistered(); err != nil {
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| 125 | uc.logger.Printf("failed to register: %v", err)
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| 126 | net.user.events <- eventUpstreamConnectionError{net, fmt.Errorf("failed to register: %v", err)}
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| 127 | uc.Close()
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| 128 | continue
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| 129 | }
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| 130 |
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| 131 | // TODO: this is racy with net.stopped. If the network is stopped
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| 132 | // before the user goroutine receives eventUpstreamConnected, the
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| 133 | // connection won't be closed.
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| 134 | net.user.events <- eventUpstreamConnected{uc}
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| 135 | if err := uc.readMessages(net.user.events); err != nil {
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| 136 | uc.logger.Printf("failed to handle messages: %v", err)
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| 137 | net.user.events <- eventUpstreamError{uc, fmt.Errorf("failed to handle messages: %v", err)}
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| 138 | }
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| 139 | uc.Close()
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| 140 | net.user.events <- eventUpstreamDisconnected{uc}
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| 141 | }
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| 142 | }
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| 143 |
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| 144 | func (net *network) stop() {
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| 145 | if !net.isStopped() {
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| 146 | close(net.stopped)
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| 147 | }
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| 148 |
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| 149 | if net.conn != nil {
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| 150 | net.conn.Close()
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| 151 | }
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| 152 | }
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| 153 |
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| 154 | func (net *network) createUpdateChannel(ch *Channel) error {
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| 155 | if current, ok := net.channels[ch.Name]; ok {
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| 156 | ch.ID = current.ID // update channel if it already exists
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| 157 | }
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| 158 | if err := net.user.srv.db.StoreChannel(net.ID, ch); err != nil {
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| 159 | return err
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| 160 | }
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| 161 | prev := net.channels[ch.Name]
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| 162 | net.channels[ch.Name] = ch
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| 163 |
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| 164 | if prev != nil && prev.Detached != ch.Detached {
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| 165 | history := net.history[ch.Name]
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| 166 | if ch.Detached {
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| 167 | net.user.srv.Logger.Printf("network %q: detaching channel %q", net.GetName(), ch.Name)
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| 168 | net.forEachDownstream(func(dc *downstreamConn) {
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| 169 | net.offlineClients[dc.clientName] = struct{}{}
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| 170 | if history != nil {
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| 171 | history.offlineClients[dc.clientName] = history.ring.Cur()
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| 172 | }
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| 173 |
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| 174 | dc.SendMessage(&irc.Message{
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| 175 | Prefix: dc.prefix(),
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| 176 | Command: "PART",
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| 177 | Params: []string{dc.marshalEntity(net, ch.Name), "Detach"},
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| 178 | })
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| 179 | })
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| 180 | } else {
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| 181 | net.user.srv.Logger.Printf("network %q: attaching channel %q", net.GetName(), ch.Name)
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| 182 |
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| 183 | var uch *upstreamChannel
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| 184 | if net.conn != nil {
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| 185 | uch = net.conn.channels[ch.Name]
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| 186 | }
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| 187 |
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| 188 | net.forEachDownstream(func(dc *downstreamConn) {
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| 189 | dc.SendMessage(&irc.Message{
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| 190 | Prefix: dc.prefix(),
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| 191 | Command: "JOIN",
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| 192 | Params: []string{dc.marshalEntity(net, ch.Name)},
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| 193 | })
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| 194 |
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| 195 | if uch != nil {
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| 196 | forwardChannel(dc, uch)
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| 197 | }
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| 198 |
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| 199 | if history != nil {
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| 200 | dc.sendNetworkHistory(net)
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| 201 | }
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| 202 | })
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| 203 | }
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| 204 | }
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| 205 |
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| 206 | return nil
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| 207 | }
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| 208 |
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| 209 | func (net *network) deleteChannel(name string) error {
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| 210 | if err := net.user.srv.db.DeleteChannel(net.ID, name); err != nil {
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| 211 | return err
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| 212 | }
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| 213 | delete(net.channels, name)
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| 214 | return nil
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| 215 | }
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| 216 |
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| 217 | type user struct {
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| 218 | User
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| 219 | srv *Server
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| 220 |
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| 221 | events chan event
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| 222 |
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| 223 | networks []*network
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| 224 | downstreamConns []*downstreamConn
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| 225 |
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| 226 | // LIST commands in progress
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| 227 | pendingLISTs []pendingLIST
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| 228 | }
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| 229 |
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| 230 | type pendingLIST struct {
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| 231 | downstreamID uint64
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| 232 | // list of per-upstream LIST commands not yet sent or completed
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| 233 | pendingCommands map[int64]*irc.Message
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| 234 | }
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| 235 |
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| 236 | func newUser(srv *Server, record *User) *user {
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| 237 | return &user{
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| 238 | User: *record,
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| 239 | srv: srv,
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| 240 | events: make(chan event, 64),
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| 241 | }
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| 242 | }
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| 243 |
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| 244 | func (u *user) forEachNetwork(f func(*network)) {
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| 245 | for _, network := range u.networks {
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| 246 | f(network)
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| 247 | }
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| 248 | }
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| 249 |
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| 250 | func (u *user) forEachUpstream(f func(uc *upstreamConn)) {
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| 251 | for _, network := range u.networks {
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| 252 | if network.conn == nil {
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| 253 | continue
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| 254 | }
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| 255 | f(network.conn)
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| 256 | }
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| 257 | }
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| 258 |
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| 259 | func (u *user) forEachDownstream(f func(dc *downstreamConn)) {
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| 260 | for _, dc := range u.downstreamConns {
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| 261 | f(dc)
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| 262 | }
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| 263 | }
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| 264 |
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| 265 | func (u *user) getNetwork(name string) *network {
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| 266 | for _, network := range u.networks {
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| 267 | if network.Addr == name {
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| 268 | return network
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| 269 | }
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| 270 | if network.Name != "" && network.Name == name {
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| 271 | return network
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| 272 | }
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| 273 | }
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| 274 | return nil
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| 275 | }
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| 276 |
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| 277 | func (u *user) getNetworkByID(id int64) *network {
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| 278 | for _, net := range u.networks {
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| 279 | if net.ID == id {
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| 280 | return net
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| 281 | }
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| 282 | }
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| 283 | return nil
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| 284 | }
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| 285 |
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| 286 | func (u *user) run() {
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| 287 | networks, err := u.srv.db.ListNetworks(u.Username)
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| 288 | if err != nil {
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| 289 | u.srv.Logger.Printf("failed to list networks for user %q: %v", u.Username, err)
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| 290 | return
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| 291 | }
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| 292 |
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| 293 | for _, record := range networks {
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| 294 | record := record
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| 295 | channels, err := u.srv.db.ListChannels(record.ID)
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| 296 | if err != nil {
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| 297 | u.srv.Logger.Printf("failed to list channels for user %q, network %q: %v", u.Username, record.GetName(), err)
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| 298 | continue
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| 299 | }
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| 300 |
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| 301 | network := newNetwork(u, &record, channels)
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| 302 | u.networks = append(u.networks, network)
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| 303 |
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| 304 | go network.run()
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| 305 | }
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| 306 |
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| 307 | for e := range u.events {
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| 308 | switch e := e.(type) {
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| 309 | case eventUpstreamConnected:
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| 310 | uc := e.uc
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| 311 |
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| 312 | uc.network.conn = uc
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| 313 |
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| 314 | uc.updateAway()
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| 315 |
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| 316 | uc.forEachDownstream(func(dc *downstreamConn) {
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| 317 | dc.updateSupportedCaps()
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| 318 | sendServiceNOTICE(dc, fmt.Sprintf("connected to %s", uc.network.GetName()))
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| 319 |
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| 320 | dc.updateNick()
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| 321 | })
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| 322 | uc.network.lastError = nil
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| 323 | case eventUpstreamDisconnected:
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| 324 | u.handleUpstreamDisconnected(e.uc)
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| 325 | case eventUpstreamConnectionError:
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| 326 | net := e.net
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| 327 |
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| 328 | stopped := false
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| 329 | select {
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| 330 | case <-net.stopped:
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| 331 | stopped = true
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| 332 | default:
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| 333 | }
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| 334 |
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| 335 | if !stopped && (net.lastError == nil || net.lastError.Error() != e.err.Error()) {
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| 336 | net.forEachDownstream(func(dc *downstreamConn) {
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| 337 | sendServiceNOTICE(dc, fmt.Sprintf("failed connecting/registering to %s: %v", net.GetName(), e.err))
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| 338 | })
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| 339 | }
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| 340 | net.lastError = e.err
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| 341 | case eventUpstreamError:
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| 342 | uc := e.uc
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| 343 |
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| 344 | uc.forEachDownstream(func(dc *downstreamConn) {
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| 345 | sendServiceNOTICE(dc, fmt.Sprintf("disconnected from %s: %v", uc.network.GetName(), e.err))
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| 346 | })
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| 347 | uc.network.lastError = e.err
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| 348 | case eventUpstreamMessage:
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| 349 | msg, uc := e.msg, e.uc
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| 350 | if uc.isClosed() {
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| 351 | uc.logger.Printf("ignoring message on closed connection: %v", msg)
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| 352 | break
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| 353 | }
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| 354 | if err := uc.handleMessage(msg); err != nil {
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| 355 | uc.logger.Printf("failed to handle message %q: %v", msg, err)
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| 356 | }
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| 357 | case eventDownstreamConnected:
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| 358 | dc := e.dc
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| 359 |
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| 360 | if err := dc.welcome(); err != nil {
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| 361 | dc.logger.Printf("failed to handle new registered connection: %v", err)
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| 362 | break
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| 363 | }
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| 364 |
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| 365 | u.downstreamConns = append(u.downstreamConns, dc)
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| 366 |
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| 367 | u.forEachUpstream(func(uc *upstreamConn) {
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| 368 | uc.updateAway()
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| 369 | })
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| 370 |
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| 371 | dc.updateSupportedCaps()
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| 372 | case eventDownstreamDisconnected:
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| 373 | dc := e.dc
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| 374 |
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| 375 | for i := range u.downstreamConns {
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| 376 | if u.downstreamConns[i] == dc {
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| 377 | u.downstreamConns = append(u.downstreamConns[:i], u.downstreamConns[i+1:]...)
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| 378 | break
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| 379 | }
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| 380 | }
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| 381 |
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| 382 | // Save history if we're the last client with this name
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| 383 | skipHistory := make(map[*network]bool)
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| 384 | u.forEachDownstream(func(conn *downstreamConn) {
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| 385 | if dc.clientName == conn.clientName {
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| 386 | skipHistory[conn.network] = true
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| 387 | }
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| 388 | })
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| 389 |
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| 390 | dc.forEachNetwork(func(net *network) {
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| 391 | if skipHistory[net] || skipHistory[nil] {
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| 392 | return
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| 393 | }
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| 394 |
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| 395 | net.offlineClients[dc.clientName] = struct{}{}
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| 396 | for target, history := range net.history {
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| 397 | if ch, ok := net.channels[target]; ok && ch.Detached {
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| 398 | continue
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| 399 | }
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| 400 | history.offlineClients[dc.clientName] = history.ring.Cur()
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| 401 | }
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| 402 | })
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| 403 |
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| 404 | u.forEachUpstream(func(uc *upstreamConn) {
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| 405 | uc.updateAway()
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| 406 | })
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| 407 | case eventDownstreamMessage:
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| 408 | msg, dc := e.msg, e.dc
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| 409 | if dc.isClosed() {
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| 410 | dc.logger.Printf("ignoring message on closed connection: %v", msg)
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| 411 | break
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| 412 | }
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| 413 | err := dc.handleMessage(msg)
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| 414 | if ircErr, ok := err.(ircError); ok {
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| 415 | ircErr.Message.Prefix = dc.srv.prefix()
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| 416 | dc.SendMessage(ircErr.Message)
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| 417 | } else if err != nil {
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| 418 | dc.logger.Printf("failed to handle message %q: %v", msg, err)
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| 419 | dc.Close()
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| 420 | }
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| 421 | case eventStop:
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| 422 | u.forEachDownstream(func(dc *downstreamConn) {
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| 423 | dc.Close()
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| 424 | })
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| 425 | for _, n := range u.networks {
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| 426 | n.stop()
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| 427 | }
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| 428 | return
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| 429 | default:
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| 430 | u.srv.Logger.Printf("received unknown event type: %T", e)
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| 431 | }
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| 432 | }
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| 433 | }
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| 434 |
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| 435 | func (u *user) handleUpstreamDisconnected(uc *upstreamConn) {
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| 436 | uc.network.conn = nil
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| 437 |
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| 438 | for _, ml := range uc.messageLoggers {
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| 439 | if err := ml.Close(); err != nil {
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| 440 | uc.logger.Printf("failed to close message logger: %v", err)
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| 441 | }
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| 442 | }
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| 443 |
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| 444 | uc.endPendingLISTs(true)
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| 445 |
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| 446 | uc.forEachDownstream(func(dc *downstreamConn) {
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| 447 | dc.updateSupportedCaps()
|
|---|
| 448 | })
|
|---|
| 449 |
|
|---|
| 450 | if uc.network.lastError == nil {
|
|---|
| 451 | uc.forEachDownstream(func(dc *downstreamConn) {
|
|---|
| 452 | sendServiceNOTICE(dc, fmt.Sprintf("disconnected from %s", uc.network.GetName()))
|
|---|
| 453 | })
|
|---|
| 454 | }
|
|---|
| 455 | }
|
|---|
| 456 |
|
|---|
| 457 | func (u *user) addNetwork(network *network) {
|
|---|
| 458 | u.networks = append(u.networks, network)
|
|---|
| 459 | go network.run()
|
|---|
| 460 | }
|
|---|
| 461 |
|
|---|
| 462 | func (u *user) removeNetwork(network *network) {
|
|---|
| 463 | network.stop()
|
|---|
| 464 |
|
|---|
| 465 | u.forEachDownstream(func(dc *downstreamConn) {
|
|---|
| 466 | if dc.network != nil && dc.network == network {
|
|---|
| 467 | dc.Close()
|
|---|
| 468 | }
|
|---|
| 469 | })
|
|---|
| 470 |
|
|---|
| 471 | for i, net := range u.networks {
|
|---|
| 472 | if net == network {
|
|---|
| 473 | u.networks = append(u.networks[:i], u.networks[i+1:]...)
|
|---|
| 474 | return
|
|---|
| 475 | }
|
|---|
| 476 | }
|
|---|
| 477 |
|
|---|
| 478 | panic("tried to remove a non-existing network")
|
|---|
| 479 | }
|
|---|
| 480 |
|
|---|
| 481 | func (u *user) createNetwork(record *Network) (*network, error) {
|
|---|
| 482 | if record.ID != 0 {
|
|---|
| 483 | panic("tried creating an already-existing network")
|
|---|
| 484 | }
|
|---|
| 485 |
|
|---|
| 486 | network := newNetwork(u, record, nil)
|
|---|
| 487 | err := u.srv.db.StoreNetwork(u.Username, &network.Network)
|
|---|
| 488 | if err != nil {
|
|---|
| 489 | return nil, err
|
|---|
| 490 | }
|
|---|
| 491 |
|
|---|
| 492 | u.addNetwork(network)
|
|---|
| 493 |
|
|---|
| 494 | return network, nil
|
|---|
| 495 | }
|
|---|
| 496 |
|
|---|
| 497 | func (u *user) updateNetwork(record *Network) (*network, error) {
|
|---|
| 498 | if record.ID == 0 {
|
|---|
| 499 | panic("tried updating a new network")
|
|---|
| 500 | }
|
|---|
| 501 |
|
|---|
| 502 | network := u.getNetworkByID(record.ID)
|
|---|
| 503 | if network == nil {
|
|---|
| 504 | panic("tried updating a non-existing network")
|
|---|
| 505 | }
|
|---|
| 506 |
|
|---|
| 507 | if err := u.srv.db.StoreNetwork(u.Username, record); err != nil {
|
|---|
| 508 | return nil, err
|
|---|
| 509 | }
|
|---|
| 510 |
|
|---|
| 511 | // Most network changes require us to re-connect to the upstream server
|
|---|
| 512 |
|
|---|
| 513 | channels := make([]Channel, 0, len(network.channels))
|
|---|
| 514 | for _, ch := range network.channels {
|
|---|
| 515 | channels = append(channels, *ch)
|
|---|
| 516 | }
|
|---|
| 517 |
|
|---|
| 518 | updatedNetwork := newNetwork(u, record, channels)
|
|---|
| 519 |
|
|---|
| 520 | // If we're currently connected, disconnect and perform the necessary
|
|---|
| 521 | // bookkeeping
|
|---|
| 522 | if network.conn != nil {
|
|---|
| 523 | network.stop()
|
|---|
| 524 | // Note: this will set network.conn to nil
|
|---|
| 525 | u.handleUpstreamDisconnected(network.conn)
|
|---|
| 526 | }
|
|---|
| 527 |
|
|---|
| 528 | // Patch downstream connections to use our fresh updated network
|
|---|
| 529 | u.forEachDownstream(func(dc *downstreamConn) {
|
|---|
| 530 | if dc.network != nil && dc.network == network {
|
|---|
| 531 | dc.network = updatedNetwork
|
|---|
| 532 | }
|
|---|
| 533 | })
|
|---|
| 534 |
|
|---|
| 535 | // We need to remove the network after patching downstream connections,
|
|---|
| 536 | // otherwise they'll get closed
|
|---|
| 537 | u.removeNetwork(network)
|
|---|
| 538 |
|
|---|
| 539 | // This will re-connect to the upstream server
|
|---|
| 540 | u.addNetwork(updatedNetwork)
|
|---|
| 541 |
|
|---|
| 542 | return updatedNetwork, nil
|
|---|
| 543 | }
|
|---|
| 544 |
|
|---|
| 545 | func (u *user) deleteNetwork(id int64) error {
|
|---|
| 546 | network := u.getNetworkByID(id)
|
|---|
| 547 | if network == nil {
|
|---|
| 548 | panic("tried deleting a non-existing network")
|
|---|
| 549 | }
|
|---|
| 550 |
|
|---|
| 551 | if err := u.srv.db.DeleteNetwork(network.ID); err != nil {
|
|---|
| 552 | return err
|
|---|
| 553 | }
|
|---|
| 554 |
|
|---|
| 555 | u.removeNetwork(network)
|
|---|
| 556 | return nil
|
|---|
| 557 | }
|
|---|
| 558 |
|
|---|
| 559 | func (u *user) updatePassword(hashed string) error {
|
|---|
| 560 | u.User.Password = hashed
|
|---|
| 561 | return u.srv.db.StoreUser(&u.User)
|
|---|
| 562 | }
|
|---|
| 563 |
|
|---|
| 564 | func (u *user) stop() {
|
|---|
| 565 | u.events <- eventStop{}
|
|---|
| 566 | }
|
|---|
