1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
-- Handles the bridge to javascript to do peer-to-peer connections
log = require("log")
rng = require("rng")
util = require("util")
net = {}
initialized = false
initialize = () ->
am.eval_js(require("js_bridge"))
initialized = true
net.call = (method, args) ->
if not initialized
initialize!
args = args or {}
json_str = am.to_json(args)
log.info("Json string sent to javascript:" .. tostring(json_str), {"net"})
result = am.eval_js("window.PEER." .. method .. "(" .. am.to_json(args) .. ")")
result
net.pull_peers = () ->
if not initialized
initialize!
messages = am.eval_js("window.PEER.peer_message_queue")
am.eval_js("window.PEER.peer_message_queue = []")
messages
net.pull_connections = () ->
if not initialized
initialize!
messages = am.eval_js("window.PEER.connection_message_queue")
am.eval_js("window.PEER.connection_message_queue = []")
messages
net.pull_creation = () ->
if not initialized
initialize!
creations = am.eval_js("window.PEER.creation_queue")
am.eval_js("window.PEER.creation_queue = []")
creations
-- Sequence of function(peer, message) | function(connection, message)
-- functions of (peer,message) for peer "open","connection","call","close","disconnected","error"
-- functions of (connection, message) for connection "data","open","close","error"
callbacks = {}
callback_info = {}
-- Map of [string peerid] = Peer
peers = {}
--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
callback_info[newid] = debug.getinfo(callback)
-- Wait until the JS-side directional connection [source,dest] is ready
while am.eval_js('window.PEER.connections[["' .. @source .. '","' .. @dest .. '"]] == null')
coroutine.yield("Waiting for peer")
-- Attach handler to this directional connection (source -> dest)
net.call("conn_on", {source: @source, dest: @dest, e: event, message: newid})
send: (msgname, msg) =>
-- Send as array: [msgname, msg]
log.info("Sending",{"net"})
res = net.call("send",{source: @source, dest: @dest, data: {msgname, msg}})
res
class Peer
@methods = util.reverse({"open","connection","call","close","disconnected","error"})
@max_attempts = 4
@create_timeout = 10
new: () =>
log.info("Creating peer...", {"net"})
net.call("create")
creations = {}
starttime = am.eval_js("Date.now()")
attempts = 0
while #creations == 0 and attempts < @@max_attempts
creations = net.pull_creation()
if #creations > 1
error("Created more than 1 peer at a time, we don't know which one we are")
messages = net.pull_connections()
log.info("Creating peer " .. attempts .. "/" .. tostring(@@max_attempts), {"net"})
if #messages > 0
if messages[1] and messages[1].data and messages[1].data.message.type == "network"
-- Try again
net.call("create")
attempts += 1
starttime = am.eval_js("Date.now()")
else
error(tostring(messages))
if am.eval_js("Date.now()") - starttime > (@@create_timeout * 1000)
net.call("create")
attempts += 1
starttime = am.eval_js("Date.now()")
if attempts > @@max_attempts
error("Failed to create host after 4 attempts")
coroutine.yield!
if attempts == @@max_attempts
error("Failed to create peer, check https://status.peerjs.com")
@id = creations[1]
peers[@id] = @
log.info("Creating peer: " .. @id, {"net"})
generate_id: () =>
os.date("%Y%e") .. 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] = {}
log.info("Registered message type:" .. name, {"net"})
net.validate = (name, message) ->
log.debug("Validating message:" .. tostring(message), {"net"})
assert(type(message) == "table", "Message must be a table")
format = messages[name]
assert(format, "Failed to find a format: " .. 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,
net.rewrite_events = {
connection: (message) ->
-- message.data.data is [server, client]; build Hub-side Connection(server->client)
conn = Connection\get(message.data.data[1], message.data.data[2])
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 net.rewrite_events[message.data.e]
log.info("Rewriting data due to " .. message.data.e .. " event", {"net", message.data.peer})
net.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})
-- Extra debug for connection routing
peer = message.data and message.data.peer or "nil"
dest = message.data and message.data.dest or "nil"
inner = message.data and message.data.data or nil
log.debug("NET connection msg peer=" .. tostring(peer) ..
" dest=" .. tostring(dest) ..
" inner=" .. tostring(inner), {"net", "debug"})
-- For connection events, message.data is a wrapper from JS bridge.
-- The actual payload from Connection:send is in message.data.data.
payload = inner or message.data
-- message.data.peer is the source, message.data.dest is the dest from JS bridge
connection = Connection\get(message.data.peer, message.data.dest)
callback = callbacks[message.message]
if callback
wcall = () ->
callback(connection, payload)
handler = (err) ->
info = callback_info[message.message]
string.format("Failed to call callback defined at %s:%d:\n%s", info.short_src, info.linedefined, debug.traceback(err))
assert(xpcall(wcall, handler))
else
log.warn("Failed to find callback for message:" .. tostring(message),{"net"})
--assert(callback, "Failed to find callback " .. tostring(message.message) .. " for message" .. tostring(message))
net.peers = () ->
peers
net.node = am.group!
initialize!
net
|
