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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"
"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 closedNode = &waBinary.Node{Tag: "xmlstreamend"}
func (cli *Client) clearResponseWaiters() {
cli.responseWaitersLock.Lock()
for _, waiter := range cli.responseWaiters {
select {
case waiter <- closedNode:
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
Context context.Context
}
func (cli *Client) sendIQAsync(query infoQuery) (<-chan *waBinary.Node, 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
}
err := cli.sendNode(waBinary.Node{
Tag: "iq",
Attrs: attrs,
Content: query.Content,
})
if err != nil {
cli.cancelResponse(query.ID, waiter)
return nil, err
}
return waiter, nil
}
func (cli *Client) sendIQ(query infoQuery) (*waBinary.Node, error) {
resChan, err := cli.sendIQAsync(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 res == closedNode {
return nil, ErrIQDisconnected
}
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
}
}
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