1704977e76
Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
190 lines
4.3 KiB
Go
190 lines
4.3 KiB
Go
package notifier
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import (
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"context"
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"fmt"
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"slices"
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"strings"
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"sync"
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"github.com/juanfont/headscale/hscontrol/types"
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"github.com/rs/zerolog/log"
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)
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type Notifier struct {
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l sync.RWMutex
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nodes map[types.NodeID]chan<- types.StateUpdate
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connected types.NodeConnectedMap
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}
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func NewNotifier() *Notifier {
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return &Notifier{
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nodes: make(map[types.NodeID]chan<- types.StateUpdate),
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connected: make(types.NodeConnectedMap),
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}
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}
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func (n *Notifier) AddNode(nodeID types.NodeID, c chan<- types.StateUpdate) {
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log.Trace().Caller().Uint64("node.id", nodeID.Uint64()).Msg("acquiring lock to add node")
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defer log.Trace().
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Caller().
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Uint64("node.id", nodeID.Uint64()).
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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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n.nodes[nodeID] = c
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n.connected[nodeID] = true
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log.Trace().
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Uint64("node.id", nodeID.Uint64()).
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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(nodeID types.NodeID) {
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log.Trace().Caller().Uint64("node.id", nodeID.Uint64()).Msg("acquiring lock to remove node")
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defer log.Trace().
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Caller().
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Uint64("node.id", nodeID.Uint64()).
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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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if len(n.nodes) == 0 {
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return
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}
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delete(n.nodes, nodeID)
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n.connected[nodeID] = false
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log.Trace().
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Uint64("node.id", nodeID.Uint64()).
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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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// 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(nodeID types.NodeID) bool {
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n.l.RLock()
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defer n.l.RUnlock()
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return n.connected[nodeID]
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}
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// IsLikelyConnected reports if a node is connected to headscale and has a
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// poll session open, but doesnt lock, so might be wrong.
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func (n *Notifier) IsLikelyConnected(nodeID types.NodeID) bool {
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return n.connected[nodeID]
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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() types.NodeConnectedMap {
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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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ignoreNodeIDs ...types.NodeID,
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) {
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log.Trace().Caller().Str("type", update.Type.String()).Msg("acquiring lock to notify")
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defer log.Trace().
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Caller().
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Str("type", update.Type.String()).
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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 update.Type == types.StatePeerChangedPatch {
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log.Trace().Interface("update", update).Interface("online", n.connected).Msg("PATCH UPDATE SENT")
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}
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for nodeID, c := range n.nodes {
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if slices.Contains(ignoreNodeIDs, nodeID) {
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continue
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}
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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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Uint64("node.id", nodeID.Uint64()).
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Any("origin", ctx.Value("origin")).
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Any("origin-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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Uint64("node.id", nodeID.Uint64()).
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Any("origin", ctx.Value("origin")).
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Any("origin-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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nodeID types.NodeID,
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) {
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log.Trace().Caller().Str("type", update.Type.String()).Msg("acquiring lock to notify")
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defer log.Trace().
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Caller().
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Str("type", update.Type.String()).
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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[nodeID]; 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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Uint64("node.id", nodeID.Uint64()).
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Any("origin", ctx.Value("origin")).
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Any("origin-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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Uint64("node.id", nodeID.Uint64()).
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Any("origin", ctx.Value("origin")).
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Any("origin-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) String() string {
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n.l.RLock()
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defer n.l.RUnlock()
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var b strings.Builder
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b.WriteString("chans:\n")
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for k, v := range n.nodes {
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fmt.Fprintf(&b, "\t%d: %p\n", k, v)
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}
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b.WriteString("\n")
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b.WriteString("connected:\n")
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for k, v := range n.connected {
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fmt.Fprintf(&b, "\t%d: %t\n", k, v)
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}
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return b.String()
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}
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