Use Phoenix channels with VueJS
npm install vue-channel --saveA single connection is established to the server and channels are multiplexed over the connection.
Connect to the server using the Socket class:
let socket = new Socket("/ws", {params: {userToken: "123"}})
socket.connect()
The Socket constructor takes the mount point of the socket, the authentication params, as well as options that can be found in the Socket docs, such as configuring the LongPoll transport, and heartbeat.
Channels are isolated, concurrent processes on the server that subscribe to topics and broker events between the client and server.
To join a channel, you must provide the topic, and channel params for authorization. Here's an example chat room example where "new_msg" events are listened for, messages are pushed to the server, and the channel is joined with ok/error/timeout matches:
let channel = socket.channel("room:123", {token: roomToken})
channel.on("new_msg", msg => console.log("Got message", msg) )
$input.onEnter( e => {
channel.push("new_msg", {body: e.target.val}, 10000)
.receive("ok", (msg) => console.log("created message", msg) )
.receive("error", (reasons) => console.log("create failed", reasons) )
.receive("timeout", () => console.log("Networking issue...") )
})
channel.join()
.receive("ok", ({messages}) => console.log("catching up", messages) )
.receive("error", ({reason}) => console.log("failed join", reason) )
.receive("timeout", () => console.log("Networking issue. Still waiting...") )Creating a channel with socket.channel(topic, params), binds the params to channel.params, which are sent up on channel.join().
Subsequent rejoins will send up the modified params for updating authorization params, or passing up last_message_id information.
Successful joins receive an "ok" status, while unsuccessful joins receive "error".
While the client may join any number of topics on any number of channels,
the client may only hold a single subscription for each unique topic at any
given time. When attempting to create a duplicate subscription,
the server will close the existing channel, log a warning, and
spawn a new channel for the topic. The client will have their
channel.onClose callbacks fired for the existing channel, and the new
channel join will have its receive hooks processed as normal.
From the previous example, we can see that pushing messages to the server
can be done with channel.push(eventName, payload) and we can optionally
receive responses from the push. Additionally, we can use
receive("timeout", callback) to abort waiting for our other receive hooks
and take action after some period of waiting. The default timeout is 5000ms.
Lifecycle events of the multiplexed connection can be hooked into via
socket.onError() and socket.onClose() events, ie:
socket.onError( () => console.log("there was an error with the connection!") )
socket.onClose( () => console.log("the connection dropped") )
For each joined channel, you can bind to onError and onClose events
to monitor the channel lifecycle, ie:
channel.onError( () => console.log("there was an error!") )
channel.onClose( () => console.log("the channel has gone away gracefully") )
onError hooks are invoked if the socket connection drops, or the channel
crashes on the server. In either case, a channel rejoin is attempted
automatically in an exponential backoff manner.
onClose hooks are invoked only in two cases. 1) the channel explicitly
closed on the server, or 2). The client explicitly closed, by calling
channel.leave()
The Presence object provides features for syncing presence information
from the server with the client and handling presences joining and leaving.
Presence.syncState is used to sync the list of presences on the server
with the client's state. An optional onJoin and onLeave callback can
be provided to react to changes in the client's local presences across
disconnects and reconnects with the server.
Presence.syncDiff is used to sync a diff of presence join and leave
events from the server, as they happen. Like syncState, syncDiff
accepts optional onJoin and onLeave callbacks to react to a user
joining or leaving from a device.
Presence.list is used to return a list of presence information based on the local state of metadata. By default, all presence metadata is returned, but a listBy function can be supplied to allow the client to select which metadata to use for a given presence.
For example, you may have a user online from different devices with a a metadata status of "online", but they have set themselves to "away" on another device. In this case, they app may choose to use the "away" status for what appears on the UI. The example below defines a listBy function which prioritizes the first metadata which was registered for each user. This could be the first tab they opened, or the first device
they came online from:
let state = {}
state = Presence.syncState(state, stateFromServer)
let listBy = (id, {metas: [first, ...rest]}) => {
first.count = rest.length + 1 count of this user's presences
first.id = id
return first
}
let onlineUsers = Presence.list(state, listBy)Automatic socket connection from an URL string
import VueChannel from 'vue-channel';
Vue.use(VueChannel, 'http://phoenixapp.local:4000/socket', {});Enable Vuex integration
import Vuex from 'vuex'
const store = new Vuex({});
Vue.use(VueChannel, 'http://phoenixapp.local:4000/socket', {}, store);`
Example store, socket mutations always have "SOCKET_" prefix
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex);
export default new Vuex.Store({
state: {
connect: false,
message: null
},
mutations:{
SOCKET_CONNECT: (state, status ) => {
state.connect = true;
},
SOCKET_USER_MESSAGE: (state, message) => {
state.message = message;
}
},
actions: {
otherAction: ({ commit, dispatch, state }, type) => {
return true;
}
}
})
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