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|
-- Handles the bridge to javascript to do peer-to-peer connections
log = require("log")
rng = require("rng")
util = require("util")
net = {}
initalized = false
initalize = () ->
am.eval_js(require("js_bridge"))
initalized = true
net.call = (method, args) ->
if not initalized
initalize!
result = am.eval_js("window.PEER." .. method .. "(" .. am.to_json(args) .. ")")
result
net.pull_peers = () ->
if not initalized
initalize!
messages = am.eval_js("window.PEER.peer_message_queue")
am.eval_js("window.PEER.peer_message_queue = []")
messages
net.pull_connections = () ->
if not initalized
initalize!
messages = am.eval_js("window.PEER.connection_message_queue")
am.eval_js("window.PEER.connection_message_queue = []")
messages
callbacks = {}
peers = {}
connections = {}
--Connections are always create js side, this is just it's lua representation
class Connection
@connections = {}
@methods = util.reverse({"data","open","close","error"})
new: (source, dest) =>
@source = source
@dest = dest
@get: (source, dest) =>
key = table.concat({source,dest},",")
if @connections[key]
return @connections[key]
@@connections[key] = Connection(source,dest)
@@connections[key]
on: (event, callback) =>
if not @@methods[event]
error("Tried to set an unknown event (" .. event .. ") on a connection")
newid = #callbacks + 1
callbacks[newid] = callback
while am.eval_js('window.PEER.connections[["' .. @source .. '","' .. @dest .. '"].sort()] == null')
print("Waiting for peer")
coroutine.yield("Waiting for peer")
--not backwards, "on" is always called on the incomming connection
net.call("conn_on", {source: @dest, dest: @source, e: event, message: newid})
send: (msgname, msg) =>
net.validate(msgname, msg)
net.call("send",{source: @source, dest: @dest, data: {msgname, msg}})
class Peer
@methods = util.reverse({"open","connection","call","close","disconnected","error"})
new: (id) =>
-- We can't create peers with peerjs-generated random ids,
-- their names are too hard to type.
-- Instead use (Year, Month), and append 4 random digits
-- to make a unique id (people can't join past midnight at the
-- end of the month, oh well)
-- Also needs to handle id-already-taken errors.
id = id or @generate_id!
while peers[id]
id = @generate_id!
@id = id
peers[@id] = @
net.call("create",{name: @id})
log.info("Creating peer: " .. @id, {"net"})
generate_id: () =>
os.date("%Y%e") .. rng.randomstring("ab",1) --.. rng.numstring(4)
replace_id: () =>
log.info("Regenerating id for peer: " .. @id, {"net"})
-- peers[@id] = nil TODO: uncomment, this breaks when running multiple peers from the same tab.
net.call("delete_peer",{name: @id})
@id = @generate_id!
peers[@id] = @
net.call("create", {name: @id})
on: (event, callback) =>
if not @@methods[event]
error("Tried to set an unknown event (" .. event .. ") on a peer.")
newid = #callbacks + 1
callbacks[newid] = callback
net.call("on",{name: @id, message:newid, e: event})
connect: (id, options) =>
conn = net.call("connect", {source: @id, dest: id})
log.info("Got connection: " .. tostring(conn), {"net"})
Connection\get(conn[1],conn[2])
net.Peer = Peer
-- A fake peer for testing
fakepeers = {}
fakeconnections = {}
fakecallbacks = {}
channel = require("channel")
class FakePeer
new: (id) =>
if id
@id = id
fakepeers[id] = @
on: (event, callback) =>
newid = #fakecallbacks + 1
fakecallbacks[newid] = callback
connect: (id, options) =>
conn = channel.FaultyChannel({
avg_latency: 200
latency_std: 100
loss: 0.1
})
conn
messages = {}
formatcache = {}
message_callbacks = {}
net.register_message = (name, format) ->
assert(type(format) == "table", "Format must be a table")
format.required = format.required or {}
format.optional = format.optional or {}
if not (next(format.required) or next(format.optional))
log.warn("Message " .. name .. " registered with no fields.")
for set in *({format.required, format.optional})
for field, type_ in pairs(set)
if type(type_) == "string"
key = string.format("%s\0%s\0%s",name,field,type_)
if not formatcache[key]
formatcache[key] = (any) ->
assert(type(any) == type_, string.format("In message %q %q must be a %q, but was a %q", name, field, type_, type(any)))
set[field] = formatcache[key]
messages[name] = format
message_callbacks[name] = {}
net.validate = (name, message) ->
log.info("Validating message:" .. tostring(message), {"net"})
assert(type(message) == "table", "Message must be a table")
format = messages[name]
required = {}
for field, validate in pairs(format.required)
required[field] = validate
for field, value in pairs(message)
if format.required[field]
required[field](value)
required[field] = nil
if format.optional[field]
format.optional[field](value)
missing = next(required)
if missing
error("Missing required field: " .. missing)
true
net.listen = (name, callback, id) ->
id = id or {}
message_callbacks[name] = message_callbacks[name] or {}
message_callbacks[name][id] = callback
id
net.defen = (name, id) ->
message_callbacks[name][id] = nil
-- net.route = (conn, name, data) ->
-- if message_callbacks[name]
-- for id, callback in pairs(message_callbacks[name])
-- ret = message_callbacks[name](conn,
rewrite_events = {
connection: (message) ->
conn = Connection\get(message.data.data[2], message.data.data[1])
assert(conn, "Failed to build conn?")
assert(conn.source and conn.dest)
message.data.data = conn
}
net.pump = () ->
msg_ = net.pull_peers!
if #msg_ > 0
log.info("Processing " .. tostring(#msg_) .. " peer messages", {"net"})
for message in *msg_
log.info(tostring(message), {"net", message.data.peer})
if rewrite_events[message.data.e]
log.info("Rewriting data due to " .. message.data.e .. " event", {"net", message.data.peer})
rewrite_events[message.data.e](message)
log.info(tostring(message), {"net", message.data.peer})
if not message.data.peer and message.data.e == "open"
log.info("Setting peerid for a peer that didn't have one " ..tostring(message), {"net"})
peer = peers[message.data.peer]
assert(peer, "Failed to find peer:" .. message.data.peer .. " peers:" .. tostring(net.peers!))
callback = callbacks[message.message]
assert(callback, "Failed to find callback " .. message.message .. " on peer " .. message.data.peer)
callback(peer,message.data)
msg_ = net.pull_connections!
if #msg_ > 0
log.info("Processing " .. tostring(#msg_) .. " connection messages", {"net"})
for message in *msg_
log.info(tostring(message), {"net", message.data.peer})
connection = Connection\get(message.dest, message.peer)
callback = callbacks[message.message]
assert(callback, "Fakled to find callback " .. message.message .. " for message" .. tostring(message))
callback(connection, message.data)
net.peers = () ->
peers
initalize!
net
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