133 lines
3.3 KiB
Go
133 lines
3.3 KiB
Go
package types
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import (
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"sync"
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"sync/atomic"
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"git.sr.ht/~rjarry/aerc/logging"
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"git.sr.ht/~rjarry/aerc/models"
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)
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var lastId int64 = 1 // access via atomic
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type Backend interface {
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Run()
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}
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type Worker struct {
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Backend Backend
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Actions chan WorkerMessage
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Messages chan WorkerMessage
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actionCallbacks map[int64]func(msg WorkerMessage)
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messageCallbacks map[int64]func(msg WorkerMessage)
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sync.Mutex
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}
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func NewWorker() *Worker {
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return &Worker{
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Actions: make(chan WorkerMessage, 50),
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Messages: make(chan WorkerMessage, 50),
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actionCallbacks: make(map[int64]func(msg WorkerMessage)),
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messageCallbacks: make(map[int64]func(msg WorkerMessage)),
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}
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}
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func (worker *Worker) setId(msg WorkerMessage) {
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id := atomic.AddInt64(&lastId, 1)
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msg.setId(id)
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}
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// PostAction posts an action to the worker. This method should not be called
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// from the same goroutine that the worker runs in or deadlocks may occur
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func (worker *Worker) PostAction(msg WorkerMessage, cb func(msg WorkerMessage)) {
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worker.setId(msg)
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if resp := msg.InResponseTo(); resp != nil {
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logging.Debugf("PostAction %T:%T", msg, resp)
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} else {
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logging.Debugf("PostAction %T", msg)
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}
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worker.Actions <- msg
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if cb != nil {
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worker.Lock()
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worker.actionCallbacks[msg.getId()] = cb
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worker.Unlock()
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}
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}
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// PostMessage posts an message to the UI. This method should not be called
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// from the same goroutine that the UI runs in or deadlocks may occur
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func (worker *Worker) PostMessage(msg WorkerMessage,
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cb func(msg WorkerMessage),
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) {
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worker.setId(msg)
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if resp := msg.InResponseTo(); resp != nil {
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logging.Debugf("PostMessage %T:%T", msg, resp)
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} else {
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logging.Debugf("PostMessage %T", msg)
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}
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worker.Messages <- msg
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if cb != nil {
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worker.Lock()
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worker.messageCallbacks[msg.getId()] = cb
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worker.Unlock()
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}
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}
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func (worker *Worker) ProcessMessage(msg WorkerMessage) WorkerMessage {
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if resp := msg.InResponseTo(); resp != nil {
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logging.Debugf("ProcessMessage %T(%d):%T(%d)", msg, msg.getId(), resp, resp.getId())
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} else {
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logging.Debugf("ProcessMessage %T(%d)", msg, msg.getId())
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}
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if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
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worker.Lock()
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if f, ok := worker.actionCallbacks[inResponseTo.getId()]; ok {
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f(msg)
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if _, ok := msg.(*Done); ok {
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delete(worker.actionCallbacks, inResponseTo.getId())
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}
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}
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worker.Unlock()
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}
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return msg
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}
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func (worker *Worker) ProcessAction(msg WorkerMessage) WorkerMessage {
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if resp := msg.InResponseTo(); resp != nil {
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logging.Debugf("ProcessAction %T(%d):%T(%d)", msg, msg.getId(), resp, resp.getId())
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} else {
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logging.Debugf("ProcessAction %T(%d)", msg, msg.getId())
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}
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if inResponseTo := msg.InResponseTo(); inResponseTo != nil {
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worker.Lock()
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if f, ok := worker.messageCallbacks[inResponseTo.getId()]; ok {
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f(msg)
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if _, ok := msg.(*Done); ok {
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delete(worker.messageCallbacks, inResponseTo.getId())
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}
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}
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worker.Unlock()
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}
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return msg
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}
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// PostMessageInfoError posts a MessageInfo message to the worker when an
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// error was encountered fetching the message header
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func (worker *Worker) PostMessageInfoError(msg WorkerMessage, uid uint32, err error) {
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worker.PostMessage(&MessageInfo{
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Info: &models.MessageInfo{
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Envelope: &models.Envelope{},
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Flags: []models.Flag{models.SeenFlag},
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Uid: uid,
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Error: err,
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},
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Message: RespondTo(msg),
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}, nil)
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}
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