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|
-- Hub-and-spoke networking client
-- Connects to hub and provides router registration for message handling
net = require "net"
log = require "log"
world = require "world"
-- Register message types for hub->client communication
net.register_message("to_client", {
required: {
target: "string"
message_type: "string"
}
optional: {
data: "table"
}
})
net.register_message("to_many_clients", {
required: {
targets: "table"
message_type: "string"
}
optional: {
data: "table"
}
})
net.register_message("broadcast", {
required: {
message_type: "string"
}
optional: {
data: "table"
}
})
class Client
new: (name) =>
@name = name or "anonymous"
@peer = nil
@hub_connection = nil
@hub_id = nil
@connected = false
@routes = {} -- message_type -> handler function
@on_connect_callbacks = {}
@on_disconnect_callbacks = {}
@initialized = false
initialize: =>
if @initialized
return
@peer = net.Peer!
log.info("Client peer created: #{@peer.id}", {"client", "net"})
@initialized = true
connect_to_hub: (hub_id) =>
if not @initialized
@initialize!
@hub_id = hub_id
@hub_connection = @peer\connect(hub_id)
-- Set up connection handlers
@hub_connection\on("open", ->
@connected = true
log.info("Connected to hub: #{hub_id}", {"client", "net"})
-- Send registration message using Connection:send(msgname, msg)
@hub_connection\send("Join", {name: @name})
-- Surface client connect/join to the browser for integration tests.
if am and am.eval_js and am.to_json
js = string.format("window._clientConnectedToHub = true; window._clientJoinPayload = %s;", am.to_json({name: @name}))
am.eval_js(js)
-- Notify connection callbacks
for callback in *@on_connect_callbacks
callback!
)
@hub_connection\on("data", (msgname, data) ->
@handle_message(msgname, data)
)
@hub_connection\on("close", ->
@connected = false
log.info("Disconnected from hub", {"client", "net"})
-- Notify disconnect callbacks
for callback in *@on_disconnect_callbacks
callback!
)
while not @connected
coroutine.yield!
handle_message: (callback_id, message_data) =>
log.info("Client handle_message callback_id=" .. tostring(callback_id) .. " message_data=" .. tostring(message_data), {"net", "client", "debug"})
-- message_data is the array [message_type, data] sent by hub
if type(message_data) ~= "table" or #message_data < 1
log.warn("Received invalid message format: " .. tostring(message_data), {"client", "net"})
return
if type(message_data[1][1]) != "string"
log.warn("Received invalid mesage type: " .. tostring(message_data[1][1]), {"client","net"})
msg_type = message_data[1][1]
msg_data = message_data[1][2] or {}
log.info("Message type: #{msg_type}", {"net", "client"})
if msg_type == "Join"
log.error("Client saw Join message in handle_message; this should be hub-only", {"client", "net", "debug"})
if not msg_type or type(msg_type) ~= "string"
log.warn("Received message without valid type:" .. tostring(msg_type), {"client", "net"})
return
world.domain = "client"
if @routes[msg_type]
-- Route to registered handlers
callbacks = @routes[msg_type]
for _, callback in pairs(callbacks)
callback(@hub_id, msg_data)
else
log.warn("No handler for message type: " .. tostring(msg_type), {"client", "net"})
msg_types = [key for key, _ in pairs(@routes)]
if #msg_types > 0
log.warn("Registered message types: " .. table.concat(msg_types, ","), {"client", "net"})
-- Register a router for a specific message type
-- callback is a (server-id:string, data:tbl) -> nil
listen: (message_type, id, callback) =>
assert(type(callback) == "function", "Listened with something that is not a function")
@routes[message_type] = @routes[message_type] or {}
id = id or #@routes[message_type] + 1
@routes[message_type][id] = callback
log.info("Router registered for #{message_type}", {"client", "net"})
id
-- Unregister a router
defen: (message_type, id) =>
if not @routes[message_type] or @routes[message_type][id] == nil
log.warn("Removing listener that doesn't exist: #{message_type}", {"client", "net"})
return
@routes[message_type][id] = nil
log.info("Listener removed for #{message_type}", {"client", "net"})
-- Send message to hub
send: (message_type, data) =>
if not @connected
log.error("Cannot send - not connected to hub", {"client", "net"})
return false
log.info("Client sending #{message_type}", {"net", "client"})
@hub_connection\send(message_type, data or {})
true
on_connect: (callback) =>
table.insert(@on_connect_callbacks, callback)
on_disconnect: (callback) =>
table.insert(@on_disconnect_callbacks, callback)
-- Synchronus request/response for use in coroutines.
sync: (request, request_data, response) =>
returned = nil
lid = @listen(response, nil, (peer, data) ->
returned = data
)
@send(request, request_data)
tries = 1
start = am.current_time!
while not returned and tries < 4
log.info("Awaiting synchronus response to " .. request, {"net","client"})
coroutine.yield!
if am.current_time! - start > 4
log.info("Async response timeout, requesting again...",{"net","client"})
@send(request, request_data)
start = am.current_time!
tries += 1
if tries == 4
error("Failed in sync request after 4 tries")
@defen(response, lid)
return returned
is_connected: =>
@connected
disconnect: =>
if @hub_connection
@hub_connection\close!
@connected = false
pump: =>
net.pump!
{:Client}
|
