// RegisterQuery is used to register a pending query that may
// get a response. The ID of the query is returned
func (c *IPCClient) RegisterQuery(q *serf.Query) uint64 {
// Generate a unique-per-client ID
id := c.nextQueryID()
// Ensure the query deadline is in the future
timeout := q.Deadline().Sub(time.Now())
if timeout < 0 {
return id
}
// Register the query
c.queryLock.Lock()
c.pendingQueries[id] = q
c.queryLock.Unlock()
// Setup a timer to deregister after the timeout
time.AfterFunc(timeout, func() {
c.queryLock.Lock()
delete(c.pendingQueries, id)
c.queryLock.Unlock()
})
return id
}
