2023-06-21 11:29:52 +02:00
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package notifier
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import (
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2024-02-08 17:28:19 +01:00
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"context"
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"fmt"
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"strings"
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"sync"
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2023-06-29 12:20:22 +02:00
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"github.com/juanfont/headscale/hscontrol/types"
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2023-06-21 11:29:52 +02:00
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"github.com/juanfont/headscale/hscontrol/util"
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"github.com/rs/zerolog/log"
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"tailscale.com/types/key"
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)
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type Notifier struct {
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l sync.RWMutex
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nodes map[string]chan<- types.StateUpdate
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connected map[key.MachinePublic]bool
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}
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func NewNotifier() *Notifier {
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return &Notifier{
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nodes: make(map[string]chan<- types.StateUpdate),
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connected: make(map[key.MachinePublic]bool),
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}
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}
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2023-11-19 22:37:04 +01:00
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func (n *Notifier) AddNode(machineKey key.MachinePublic, c chan<- types.StateUpdate) {
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log.Trace().Caller().Str("key", machineKey.ShortString()).Msg("acquiring lock to add node")
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defer log.Trace().
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Caller().
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Str("key", machineKey.ShortString()).
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Msg("releasing lock to add node")
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n.l.Lock()
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defer n.l.Unlock()
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2023-11-19 22:37:04 +01:00
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n.nodes[machineKey.String()] = c
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n.connected[machineKey] = true
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log.Trace().
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Str("machine_key", machineKey.ShortString()).
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Int("open_chans", len(n.nodes)).
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Msg("Added new channel")
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}
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func (n *Notifier) RemoveNode(machineKey key.MachinePublic) {
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log.Trace().Caller().Str("key", machineKey.ShortString()).Msg("acquiring lock to remove node")
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defer log.Trace().
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Caller().
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Str("key", machineKey.ShortString()).
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Msg("releasing lock to remove node")
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n.l.Lock()
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defer n.l.Unlock()
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2024-02-08 17:28:19 +01:00
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if len(n.nodes) == 0 {
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return
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}
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2023-11-19 22:37:04 +01:00
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delete(n.nodes, machineKey.String())
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n.connected[machineKey] = false
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log.Trace().
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Str("machine_key", machineKey.ShortString()).
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Int("open_chans", len(n.nodes)).
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Msg("Removed channel")
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}
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2023-12-09 18:09:24 +01:00
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// IsConnected reports if a node is connected to headscale and has a
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// poll session open.
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func (n *Notifier) IsConnected(machineKey key.MachinePublic) bool {
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n.l.RLock()
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defer n.l.RUnlock()
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return n.connected[machineKey]
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}
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// TODO(kradalby): This returns a pointer and can be dangerous.
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func (n *Notifier) ConnectedMap() map[key.MachinePublic]bool {
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return n.connected
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}
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func (n *Notifier) NotifyAll(ctx context.Context, update types.StateUpdate) {
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n.NotifyWithIgnore(ctx, update)
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}
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func (n *Notifier) NotifyWithIgnore(
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ctx context.Context,
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update types.StateUpdate,
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ignore ...string,
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) {
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log.Trace().Caller().Interface("type", update.Type).Msg("acquiring lock to notify")
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defer log.Trace().
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Caller().
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Interface("type", update.Type).
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Msg("releasing lock, finished notifying")
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n.l.RLock()
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defer n.l.RUnlock()
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for key, c := range n.nodes {
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if util.IsStringInSlice(ignore, key) {
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continue
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}
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2024-02-08 17:28:19 +01:00
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select {
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case <-ctx.Done():
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log.Error().
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Err(ctx.Err()).
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Str("mkey", key).
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Any("origin", ctx.Value("origin")).
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Any("hostname", ctx.Value("hostname")).
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Msgf("update not sent, context cancelled")
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return
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case c <- update:
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log.Trace().
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Str("mkey", key).
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Any("origin", ctx.Value("origin")).
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Any("hostname", ctx.Value("hostname")).
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Msgf("update successfully sent on chan")
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}
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}
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}
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func (n *Notifier) NotifyByMachineKey(
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ctx context.Context,
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update types.StateUpdate,
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mKey key.MachinePublic,
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) {
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2024-01-05 10:41:56 +01:00
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log.Trace().Caller().Interface("type", update.Type).Msg("acquiring lock to notify")
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defer log.Trace().
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Caller().
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Interface("type", update.Type).
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Msg("releasing lock, finished notifying")
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n.l.RLock()
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defer n.l.RUnlock()
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if c, ok := n.nodes[mKey.String()]; ok {
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select {
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case <-ctx.Done():
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log.Error().
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Err(ctx.Err()).
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Str("mkey", mKey.String()).
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Any("origin", ctx.Value("origin")).
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Any("hostname", ctx.Value("hostname")).
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Msgf("update not sent, context cancelled")
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return
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case c <- update:
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log.Trace().
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Str("mkey", mKey.String()).
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Any("origin", ctx.Value("origin")).
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Any("hostname", ctx.Value("hostname")).
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Msgf("update successfully sent on chan")
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}
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}
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}
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2023-12-09 18:09:24 +01:00
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func (n *Notifier) String() string {
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n.l.RLock()
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defer n.l.RUnlock()
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str := []string{"Notifier, in map:\n"}
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for k, v := range n.nodes {
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str = append(str, fmt.Sprintf("\t%s: %v\n", k, v))
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}
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return strings.Join(str, "")
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}
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