chore: Move httpapi, httpmw, & database into coderd (#568)

* chore: Move httpmw to /coderd directory
httpmw is specific to coderd and should be scoped under coderd

* chore: Move httpapi to /coderd directory
httpapi is specific to coderd and should be scoped under coderd

* chore: Move database  to /coderd directory
database is specific to coderd and should be scoped under coderd

* chore: Update codecov & gitattributes for generated files
* chore: Update Makefile

coderd/database/pubsub_memory.go

@@ -0,0 +1,63 @@
+package database
+
+import (
+	"context"
+	"sync"
+
+	"github.com/google/uuid"
+)
+
+// memoryPubsub is an in-memory Pubsub implementation.
+type memoryPubsub struct {
+	mut       sync.RWMutex
+	listeners map[string]map[uuid.UUID]Listener
+}
+
+func (m *memoryPubsub) Subscribe(event string, listener Listener) (cancel func(), err error) {
+	m.mut.Lock()
+	defer m.mut.Unlock()
+
+	var listeners map[uuid.UUID]Listener
+	var ok bool
+	if listeners, ok = m.listeners[event]; !ok {
+		listeners = map[uuid.UUID]Listener{}
+		m.listeners[event] = listeners
+	}
+	var id uuid.UUID
+	for {
+		id = uuid.New()
+		if _, ok = listeners[id]; !ok {
+			break
+		}
+	}
+	listeners[id] = listener
+	return func() {
+		m.mut.Lock()
+		defer m.mut.Unlock()
+		listeners := m.listeners[event]
+		delete(listeners, id)
+	}, nil
+}
+
+func (m *memoryPubsub) Publish(event string, message []byte) error {
+	m.mut.RLock()
+	defer m.mut.RUnlock()
+	listeners, ok := m.listeners[event]
+	if !ok {
+		return nil
+	}
+	for _, listener := range listeners {
+		listener(context.Background(), message)
+	}
+	return nil
+}
+
+func (*memoryPubsub) Close() error {
+	return nil
+}
+
+func NewPubsubInMemory() Pubsub {
+	return &memoryPubsub{
+		listeners: make(map[string]map[uuid.UUID]Listener),
+	}
+}