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// Copyright (c) 2021 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package whatsmeow
import (
"context"
"fmt"
"strconv"
"sync/atomic"
"time"
waBinary "go.mau.fi/whatsmeow/binary"
"go.mau.fi/whatsmeow/types"
)
func (cli *Client) generateRequestID() string {
return cli.uniqueID + strconv.FormatUint(uint64(atomic.AddUint32(&cli.idCounter, 1)), 10)
}
var xmlStreamEndNode = &waBinary.Node{Tag: "xmlstreamend"}
func isDisconnectNode(node *waBinary.Node) bool {
return node == xmlStreamEndNode || node.Tag == "stream:error"
}
// isAuthErrorDisconnect checks if the given disconnect node is an error that shouldn't cause retrying.
func isAuthErrorDisconnect(node *waBinary.Node) bool {
if node.Tag != "stream:error" {
return false
}
code, _ := node.Attrs["code"].(string)
conflict, _ := node.GetOptionalChildByTag("conflict")
conflictType := conflict.AttrGetter().OptionalString("type")
if code == "401" || conflictType == "replaced" || conflictType == "device_removed" {
return true
}
return false
}
func (cli *Client) clearResponseWaiters(node *waBinary.Node) {
cli.responseWaitersLock.Lock()
for _, waiter := range cli.responseWaiters {
select {
case waiter <- node:
default:
close(waiter)
}
}
cli.responseWaiters = make(map[string]chan<- *waBinary.Node)
cli.responseWaitersLock.Unlock()
}
func (cli *Client) waitResponse(reqID string) chan *waBinary.Node {
ch := make(chan *waBinary.Node, 1)
cli.responseWaitersLock.Lock()
cli.responseWaiters[reqID] = ch
cli.responseWaitersLock.Unlock()
return ch
}
func (cli *Client) cancelResponse(reqID string, ch chan *waBinary.Node) {
cli.responseWaitersLock.Lock()
close(ch)
delete(cli.responseWaiters, reqID)
cli.responseWaitersLock.Unlock()
}
func (cli *Client) receiveResponse(data *waBinary.Node) bool {
id, ok := data.Attrs["id"].(string)
if !ok || (data.Tag != "iq" && data.Tag != "ack") {
return false
}
cli.responseWaitersLock.Lock()
waiter, ok := cli.responseWaiters[id]
if !ok {
cli.responseWaitersLock.Unlock()
return false
}
delete(cli.responseWaiters, id)
cli.responseWaitersLock.Unlock()
waiter <- data
return true
}
type infoQueryType string
const (
iqSet infoQueryType = "set"
iqGet infoQueryType = "get"
)
type infoQuery struct {
Namespace string
Type infoQueryType
To types.JID
Target types.JID
ID string
Content interface{}
Timeout time.Duration
NoRetry bool
Context context.Context
}
func (cli *Client) sendIQAsyncAndGetData(query *infoQuery) (<-chan *waBinary.Node, []byte, error) {
if len(query.ID) == 0 {
query.ID = cli.generateRequestID()
}
waiter := cli.waitResponse(query.ID)
attrs := waBinary.Attrs{
"id": query.ID,
"xmlns": query.Namespace,
"type": string(query.Type),
}
if !query.To.IsEmpty() {
attrs["to"] = query.To
}
if !query.Target.IsEmpty() {
attrs["target"] = query.Target
}
data, err := cli.sendNodeAndGetData(waBinary.Node{
Tag: "iq",
Attrs: attrs,
Content: query.Content,
})
if err != nil {
cli.cancelResponse(query.ID, waiter)
return nil, data, err
}
return waiter, data, nil
}
func (cli *Client) sendIQAsync(query infoQuery) (<-chan *waBinary.Node, error) {
ch, _, err := cli.sendIQAsyncAndGetData(&query)
return ch, err
}
func (cli *Client) sendIQ(query infoQuery) (*waBinary.Node, error) {
resChan, data, err := cli.sendIQAsyncAndGetData(&query)
if err != nil {
return nil, err
}
if query.Timeout == 0 {
query.Timeout = 75 * time.Second
}
if query.Context == nil {
query.Context = context.Background()
}
select {
case res := <-resChan:
if isDisconnectNode(res) {
if query.NoRetry {
return nil, &DisconnectedError{Action: "info query", Node: res}
}
res, err = cli.retryFrame("info query", query.ID, data, res, query.Context, query.Timeout)
if err != nil {
return nil, err
}
}
resType, _ := res.Attrs["type"].(string)
if res.Tag != "iq" || (resType != "result" && resType != "error") {
return res, &IQError{RawNode: res}
} else if resType == "error" {
return res, parseIQError(res)
}
return res, nil
case <-query.Context.Done():
return nil, query.Context.Err()
case <-time.After(query.Timeout):
return nil, ErrIQTimedOut
}
}
func (cli *Client) retryFrame(reqType, id string, data []byte, origResp *waBinary.Node, ctx context.Context, timeout time.Duration) (*waBinary.Node, error) {
if isAuthErrorDisconnect(origResp) {
cli.Log.Debugf("%s (%s) was interrupted by websocket disconnection (%s), not retrying as it looks like an auth error", id, reqType, origResp.XMLString())
return nil, &DisconnectedError{Action: reqType, Node: origResp}
}
cli.Log.Debugf("%s (%s) was interrupted by websocket disconnection (%s), waiting for reconnect to retry...", id, reqType, origResp.XMLString())
if !cli.WaitForConnection(5 * time.Second) {
cli.Log.Debugf("Websocket didn't reconnect within 5 seconds of failed %s (%s)", reqType, id)
return nil, &DisconnectedError{Action: reqType, Node: origResp}
}
cli.socketLock.RLock()
sock := cli.socket
cli.socketLock.RUnlock()
if sock == nil {
return nil, ErrNotConnected
}
respChan := cli.waitResponse(id)
err := sock.SendFrame(data)
if err != nil {
cli.cancelResponse(id, respChan)
return nil, err
}
var resp *waBinary.Node
timeoutChan := make(<-chan time.Time, 1)
if timeout > 0 {
timeoutChan = time.After(timeout)
}
select {
case resp = <-respChan:
case <-ctx.Done():
return nil, ctx.Err()
case <-timeoutChan:
// FIXME this error isn't technically correct (but works for now - the timeout param is only used from sendIQ)
return nil, ErrIQTimedOut
}
if isDisconnectNode(resp) {
cli.Log.Debugf("Retrying %s %s was interrupted by websocket disconnection (%v), not retrying anymore", reqType, id, resp.XMLString())
return nil, &DisconnectedError{Action: fmt.Sprintf("%s (retry)", reqType), Node: resp}
}
return resp, nil
}
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