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session.go
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session.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package observers
import sync "sync"
type SessionProvider interface {
NewStackClient() (StackSession, error)
}
type StackSession interface {
StackEvents() chan *StackUpdateEvent
Close()
}
func Static() *StaticProvider {
return &StaticProvider{
clients: []chan *StackUpdateEvent{},
mu: sync.Mutex{},
}
}
type StaticProvider struct {
update *StackUpdateEvent
clients []chan *StackUpdateEvent
mu sync.Mutex
}
func (p *StaticProvider) PushUpdate(update *StackUpdateEvent) {
p.mu.Lock()
clients := p.clients
p.update = update
p.mu.Unlock()
for _, ch := range clients {
ch <- update
}
}
func (p *StaticProvider) NewStackClient() (StackSession, error) {
ch := make(chan *StackUpdateEvent, 1)
p.mu.Lock()
p.clients = append(p.clients, ch)
update := p.update
p.mu.Unlock()
if update != nil {
ch <- update
}
return staticSession{ch, p}, nil
}
func (p *StaticProvider) RemoveClient(ch chan *StackUpdateEvent) {
p.mu.Lock()
defer p.mu.Unlock()
newClients := []chan *StackUpdateEvent{}
for _, client := range p.clients {
if client != ch {
newClients = append(newClients, client)
}
}
p.clients = newClients
close(ch)
}
type staticSession struct {
ch chan *StackUpdateEvent
parent *StaticProvider
}
func (s staticSession) StackEvents() chan *StackUpdateEvent { return s.ch }
func (s staticSession) Close() { s.parent.RemoveClient(s.ch) }