xmpp/roster.go
author Chris Jones <christian.jones@sri.com>
Sat, 07 Sep 2013 11:19:29 -0700
changeset 128 8342afcffc92
parent 126 367e76b3028e
child 134 80b764fa2f08
permissions -rw-r--r--
Use reflection instead of constructor functions to create extended stanza structures.
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// Copyright 2011 The Go Authors.  All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package xmpp
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// This file contains support for roster management, RFC 3921, Section 7.
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import (
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	"encoding/xml"
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	"reflect"
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)
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// Roster query/result
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type RosterQuery struct {
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	XMLName xml.Name     `xml:"jabber:iq:roster query"`
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	Item    []RosterItem `xml:"item"`
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}
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// See RFC 3921, Section 7.1.
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type RosterItem struct {
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	XMLName      xml.Name `xml:"jabber:iq:roster item"`
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	Jid          string   `xml:"jid,attr"`
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	Subscription string   `xml:"subscription,attr"`
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	Name         string   `xml:"name,attr"`
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	Group        []string
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}
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type rosterCb struct {
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	id string
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	cb func()
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}
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type Roster struct {
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	Extension
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	get       chan []RosterItem
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	callbacks chan rosterCb
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	toServer  chan Stanza
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}
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type rosterClient struct {
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	rosterChan   <-chan []RosterItem
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	rosterUpdate chan<- RosterItem
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}
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func (r *Roster) rosterMgr(upd <-chan Stanza) {
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	roster := make(map[string]RosterItem)
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	waits := make(map[string]func())
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	var snapshot []RosterItem
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	for {
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		select {
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		case stan, ok := <-upd:
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			if !ok {
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				return
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			}
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			hdr := stan.GetHeader()
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			if f := waits[hdr.Id]; f != nil {
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				delete(waits, hdr.Id)
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				f()
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			}
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			iq, ok := stan.(*Iq)
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			if iq.Type != "set" {
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				continue
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			}
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			var rq *RosterQuery
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			for _, ele := range iq.Nested {
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				if q, ok := ele.(*RosterQuery); ok {
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					rq = q
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					break
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				}
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			}
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			if rq == nil {
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				continue
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			}
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			for _, item := range rq.Item {
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				roster[item.Jid] = item
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			}
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			snapshot = []RosterItem{}
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			for _, ri := range roster {
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				snapshot = append(snapshot, ri)
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			}
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		case r.get <- snapshot:
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		case cb := <-r.callbacks:
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			waits[cb.id] = cb.cb
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		}
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	}
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}
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func (r *Roster) makeFilters() (Filter, Filter) {
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	rosterUpdate := make(chan Stanza)
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	go r.rosterMgr(rosterUpdate)
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	recv := func(in <-chan Stanza, out chan<- Stanza) {
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		defer close(out)
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		for stan := range in {
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			rosterUpdate <- stan
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			out <- stan
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		}
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	}
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	send := func(in <-chan Stanza, out chan<- Stanza) {
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		defer close(out)
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		for {
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			select {
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			case stan, ok := <-in:
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				if !ok {
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					return
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				}
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				out <- stan
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			case stan := <-r.toServer:
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				out <- stan
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			}
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		}
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	}
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	return recv, send
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}
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func newRosterExt() *Roster {
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	r := Roster{}
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	r.StanzaHandlers = make(map[xml.Name]reflect.Type)
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	rName := xml.Name{Space: NsRoster, Local: "query"}
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	r.StanzaHandlers[rName] = reflect.TypeOf(RosterQuery{})
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	r.RecvFilter, r.SendFilter = r.makeFilters()
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	r.get = make(chan []RosterItem)
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	r.callbacks = make(chan rosterCb)
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	r.toServer = make(chan Stanza)
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	return &r
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}
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// Return the most recent snapshot of the roster status. This is
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// updated automatically as roster updates are received from the
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// server, but especially in response to calls to Update().
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func (r *Roster) Get() []RosterItem {
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	return <-r.get
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}
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// Synchronously fetch this entity's roster from the server and cache
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// that information. The client can access the roster by watching for
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// RosterQuery objects or by calling Get().
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func (r *Roster) Update() {
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	iq := &Iq{Header: Header{Type: "get", Id: NextId(),
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		Nested: []interface{}{RosterQuery{}}}}
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	waitchan := make(chan int)
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	done := func() {
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		close(waitchan)
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	}
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	r.waitFor(iq.Id, done)
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	r.toServer <- iq
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	<-waitchan
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}
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func (r *Roster) waitFor(id string, cb func()) {
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	r.callbacks <- rosterCb{id: id, cb: cb}
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}