Add lua-based server implementation
This commit is contained in:
parent
bee308df88
commit
ae76a627cb
5 changed files with 11558 additions and 0 deletions
|
|
@ -10,6 +10,7 @@
|
|||
devShell.${system} = pkgs.mkShell rec {
|
||||
buildInputs = [
|
||||
pkgs.deno
|
||||
(pkgs.lua5_3.withPackages(ps: [ ps.http ps.fennel ]))
|
||||
];
|
||||
};
|
||||
};
|
||||
|
|
|
|||
10979
lua-server/birbs.txt
Normal file
10979
lua-server/birbs.txt
Normal file
File diff suppressed because it is too large
Load diff
78
lua-server/echo.fnl
Normal file
78
lua-server/echo.fnl
Normal file
|
|
@ -0,0 +1,78 @@
|
|||
;; a simple websocket echo server
|
||||
;;
|
||||
;; usage: fennel echo.fnl <port>
|
||||
;;
|
||||
;; test via websocat ws://127.0.0.1:<port>
|
||||
|
||||
(local port (or (. arg 1) 0))
|
||||
(local http-server (require :http.server))
|
||||
(local http-headers (require :http.headers))
|
||||
(local websocket (require :http.websocket))
|
||||
|
||||
;; this handler contains the main logic. it is called further down in this
|
||||
;; file, as soon as a websocket connection has been established.
|
||||
|
||||
(fn handle-websocket [ws]
|
||||
;; TODO: Generate birb name
|
||||
(assert (ws:accept))
|
||||
;; connection is open
|
||||
(print "connection opened")
|
||||
(ws:send "Welcome to the echo server! Send any command, it will be sent back to you.")
|
||||
(var closed? false)
|
||||
(while (not closed?)
|
||||
(local (data opcode) (ws:receive))
|
||||
(if data
|
||||
(do
|
||||
(assert (= opcode :text))
|
||||
(print "opcode" opcode "data" data)
|
||||
(ws:send data))
|
||||
;; connection has been closed
|
||||
(do
|
||||
(print "connection closed")
|
||||
(ws:close)
|
||||
(set closed? true)))))
|
||||
|
||||
;; this is the low-level server code. it's an adapted version of
|
||||
;; https://github.com/daurnimator/lua-http/blob/ddab2835/examples/server_hello.lua
|
||||
|
||||
(local server
|
||||
(assert (http-server.listen {:host :localhost
|
||||
:onerror (fn [server context op err errno]
|
||||
(var msg (.. op " on " (tostring context) " failed"))
|
||||
(when err
|
||||
(set msg (.. msg ": " (tostring err))))
|
||||
(assert (io.stderr:write msg "\n")))
|
||||
:onstream (fn [server stream]
|
||||
(let [headers (assert (stream:get_headers))
|
||||
method (headers:get ":method")]
|
||||
;; log request
|
||||
(assert (io.stdout:write (string.format "[%s] \"%s %s HTTP/%g\" \"%s\" \"%s\"\n"
|
||||
(os.date "%d/%b/%Y:%H:%M:%S %z")
|
||||
(or method "")
|
||||
(or (headers:get ":path") "")
|
||||
stream.connection.version
|
||||
(or (headers:get :referer) "-")
|
||||
(or (headers:get :user-agent) "-"))))
|
||||
;; start and handle websocket connection
|
||||
(local ws (websocket.new_from_stream stream headers))
|
||||
(if ws
|
||||
(handle-websocket ws)
|
||||
;; if we couldn't establish the websocket connection, something's wrong
|
||||
(assert (stream:write_headers (doto (http-headers.new)
|
||||
(: :append ::status :400)) true)))))
|
||||
: port})))
|
||||
|
||||
(assert (server:listen))
|
||||
|
||||
(let [(_ _ bound-port) (server:localname)]
|
||||
(assert (io.stderr:write (.. "Now listening on port " bound-port "\n"))))
|
||||
|
||||
;; automatically start server when run from the command line
|
||||
(when (> (length arg) 0)
|
||||
(assert (server:loop)))
|
||||
|
||||
(comment
|
||||
;; run this to handle a response manually
|
||||
(for [i 1 3]
|
||||
(server:step))
|
||||
)
|
||||
388
lua-server/json.lua
Normal file
388
lua-server/json.lua
Normal file
|
|
@ -0,0 +1,388 @@
|
|||
--
|
||||
-- json.lua
|
||||
--
|
||||
-- Copyright (c) 2020 rxi
|
||||
--
|
||||
-- Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
-- this software and associated documentation files (the "Software"), to deal in
|
||||
-- the Software without restriction, including without limitation the rights to
|
||||
-- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
||||
-- of the Software, and to permit persons to whom the Software is furnished to do
|
||||
-- so, subject to the following conditions:
|
||||
--
|
||||
-- The above copyright notice and this permission notice shall be included in all
|
||||
-- copies or substantial portions of the Software.
|
||||
--
|
||||
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
-- SOFTWARE.
|
||||
--
|
||||
|
||||
local json = { _version = "0.1.2" }
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- Encode
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
local encode
|
||||
|
||||
local escape_char_map = {
|
||||
[ "\\" ] = "\\",
|
||||
[ "\"" ] = "\"",
|
||||
[ "\b" ] = "b",
|
||||
[ "\f" ] = "f",
|
||||
[ "\n" ] = "n",
|
||||
[ "\r" ] = "r",
|
||||
[ "\t" ] = "t",
|
||||
}
|
||||
|
||||
local escape_char_map_inv = { [ "/" ] = "/" }
|
||||
for k, v in pairs(escape_char_map) do
|
||||
escape_char_map_inv[v] = k
|
||||
end
|
||||
|
||||
|
||||
local function escape_char(c)
|
||||
return "\\" .. (escape_char_map[c] or string.format("u%04x", c:byte()))
|
||||
end
|
||||
|
||||
|
||||
local function encode_nil(val)
|
||||
return "null"
|
||||
end
|
||||
|
||||
|
||||
local function encode_table(val, stack)
|
||||
local res = {}
|
||||
stack = stack or {}
|
||||
|
||||
-- Circular reference?
|
||||
if stack[val] then error("circular reference") end
|
||||
|
||||
stack[val] = true
|
||||
|
||||
if rawget(val, 1) ~= nil or next(val) == nil then
|
||||
-- Treat as array -- check keys are valid and it is not sparse
|
||||
local n = 0
|
||||
for k in pairs(val) do
|
||||
if type(k) ~= "number" then
|
||||
error("invalid table: mixed or invalid key types")
|
||||
end
|
||||
n = n + 1
|
||||
end
|
||||
if n ~= #val then
|
||||
error("invalid table: sparse array")
|
||||
end
|
||||
-- Encode
|
||||
for i, v in ipairs(val) do
|
||||
table.insert(res, encode(v, stack))
|
||||
end
|
||||
stack[val] = nil
|
||||
return "[" .. table.concat(res, ",") .. "]"
|
||||
|
||||
else
|
||||
-- Treat as an object
|
||||
for k, v in pairs(val) do
|
||||
if type(k) ~= "string" then
|
||||
error("invalid table: mixed or invalid key types")
|
||||
end
|
||||
table.insert(res, encode(k, stack) .. ":" .. encode(v, stack))
|
||||
end
|
||||
stack[val] = nil
|
||||
return "{" .. table.concat(res, ",") .. "}"
|
||||
end
|
||||
end
|
||||
|
||||
|
||||
local function encode_string(val)
|
||||
return '"' .. val:gsub('[%z\1-\31\\"]', escape_char) .. '"'
|
||||
end
|
||||
|
||||
|
||||
local function encode_number(val)
|
||||
-- Check for NaN, -inf and inf
|
||||
if val ~= val or val <= -math.huge or val >= math.huge then
|
||||
error("unexpected number value '" .. tostring(val) .. "'")
|
||||
end
|
||||
return string.format("%.14g", val)
|
||||
end
|
||||
|
||||
|
||||
local type_func_map = {
|
||||
[ "nil" ] = encode_nil,
|
||||
[ "table" ] = encode_table,
|
||||
[ "string" ] = encode_string,
|
||||
[ "number" ] = encode_number,
|
||||
[ "boolean" ] = tostring,
|
||||
}
|
||||
|
||||
|
||||
encode = function(val, stack)
|
||||
local t = type(val)
|
||||
local f = type_func_map[t]
|
||||
if f then
|
||||
return f(val, stack)
|
||||
end
|
||||
error("unexpected type '" .. t .. "'")
|
||||
end
|
||||
|
||||
|
||||
function json.encode(val)
|
||||
return ( encode(val) )
|
||||
end
|
||||
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
-- Decode
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
local parse
|
||||
|
||||
local function create_set(...)
|
||||
local res = {}
|
||||
for i = 1, select("#", ...) do
|
||||
res[ select(i, ...) ] = true
|
||||
end
|
||||
return res
|
||||
end
|
||||
|
||||
local space_chars = create_set(" ", "\t", "\r", "\n")
|
||||
local delim_chars = create_set(" ", "\t", "\r", "\n", "]", "}", ",")
|
||||
local escape_chars = create_set("\\", "/", '"', "b", "f", "n", "r", "t", "u")
|
||||
local literals = create_set("true", "false", "null")
|
||||
|
||||
local literal_map = {
|
||||
[ "true" ] = true,
|
||||
[ "false" ] = false,
|
||||
[ "null" ] = nil,
|
||||
}
|
||||
|
||||
|
||||
local function next_char(str, idx, set, negate)
|
||||
for i = idx, #str do
|
||||
if set[str:sub(i, i)] ~= negate then
|
||||
return i
|
||||
end
|
||||
end
|
||||
return #str + 1
|
||||
end
|
||||
|
||||
|
||||
local function decode_error(str, idx, msg)
|
||||
local line_count = 1
|
||||
local col_count = 1
|
||||
for i = 1, idx - 1 do
|
||||
col_count = col_count + 1
|
||||
if str:sub(i, i) == "\n" then
|
||||
line_count = line_count + 1
|
||||
col_count = 1
|
||||
end
|
||||
end
|
||||
error( string.format("%s at line %d col %d", msg, line_count, col_count) )
|
||||
end
|
||||
|
||||
|
||||
local function codepoint_to_utf8(n)
|
||||
-- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa
|
||||
local f = math.floor
|
||||
if n <= 0x7f then
|
||||
return string.char(n)
|
||||
elseif n <= 0x7ff then
|
||||
return string.char(f(n / 64) + 192, n % 64 + 128)
|
||||
elseif n <= 0xffff then
|
||||
return string.char(f(n / 4096) + 224, f(n % 4096 / 64) + 128, n % 64 + 128)
|
||||
elseif n <= 0x10ffff then
|
||||
return string.char(f(n / 262144) + 240, f(n % 262144 / 4096) + 128,
|
||||
f(n % 4096 / 64) + 128, n % 64 + 128)
|
||||
end
|
||||
error( string.format("invalid unicode codepoint '%x'", n) )
|
||||
end
|
||||
|
||||
|
||||
local function parse_unicode_escape(s)
|
||||
local n1 = tonumber( s:sub(1, 4), 16 )
|
||||
local n2 = tonumber( s:sub(7, 10), 16 )
|
||||
-- Surrogate pair?
|
||||
if n2 then
|
||||
return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000)
|
||||
else
|
||||
return codepoint_to_utf8(n1)
|
||||
end
|
||||
end
|
||||
|
||||
|
||||
local function parse_string(str, i)
|
||||
local res = ""
|
||||
local j = i + 1
|
||||
local k = j
|
||||
|
||||
while j <= #str do
|
||||
local x = str:byte(j)
|
||||
|
||||
if x < 32 then
|
||||
decode_error(str, j, "control character in string")
|
||||
|
||||
elseif x == 92 then -- `\`: Escape
|
||||
res = res .. str:sub(k, j - 1)
|
||||
j = j + 1
|
||||
local c = str:sub(j, j)
|
||||
if c == "u" then
|
||||
local hex = str:match("^[dD][89aAbB]%x%x\\u%x%x%x%x", j + 1)
|
||||
or str:match("^%x%x%x%x", j + 1)
|
||||
or decode_error(str, j - 1, "invalid unicode escape in string")
|
||||
res = res .. parse_unicode_escape(hex)
|
||||
j = j + #hex
|
||||
else
|
||||
if not escape_chars[c] then
|
||||
decode_error(str, j - 1, "invalid escape char '" .. c .. "' in string")
|
||||
end
|
||||
res = res .. escape_char_map_inv[c]
|
||||
end
|
||||
k = j + 1
|
||||
|
||||
elseif x == 34 then -- `"`: End of string
|
||||
res = res .. str:sub(k, j - 1)
|
||||
return res, j + 1
|
||||
end
|
||||
|
||||
j = j + 1
|
||||
end
|
||||
|
||||
decode_error(str, i, "expected closing quote for string")
|
||||
end
|
||||
|
||||
|
||||
local function parse_number(str, i)
|
||||
local x = next_char(str, i, delim_chars)
|
||||
local s = str:sub(i, x - 1)
|
||||
local n = tonumber(s)
|
||||
if not n then
|
||||
decode_error(str, i, "invalid number '" .. s .. "'")
|
||||
end
|
||||
return n, x
|
||||
end
|
||||
|
||||
|
||||
local function parse_literal(str, i)
|
||||
local x = next_char(str, i, delim_chars)
|
||||
local word = str:sub(i, x - 1)
|
||||
if not literals[word] then
|
||||
decode_error(str, i, "invalid literal '" .. word .. "'")
|
||||
end
|
||||
return literal_map[word], x
|
||||
end
|
||||
|
||||
|
||||
local function parse_array(str, i)
|
||||
local res = {}
|
||||
local n = 1
|
||||
i = i + 1
|
||||
while 1 do
|
||||
local x
|
||||
i = next_char(str, i, space_chars, true)
|
||||
-- Empty / end of array?
|
||||
if str:sub(i, i) == "]" then
|
||||
i = i + 1
|
||||
break
|
||||
end
|
||||
-- Read token
|
||||
x, i = parse(str, i)
|
||||
res[n] = x
|
||||
n = n + 1
|
||||
-- Next token
|
||||
i = next_char(str, i, space_chars, true)
|
||||
local chr = str:sub(i, i)
|
||||
i = i + 1
|
||||
if chr == "]" then break end
|
||||
if chr ~= "," then decode_error(str, i, "expected ']' or ','") end
|
||||
end
|
||||
return res, i
|
||||
end
|
||||
|
||||
|
||||
local function parse_object(str, i)
|
||||
local res = {}
|
||||
i = i + 1
|
||||
while 1 do
|
||||
local key, val
|
||||
i = next_char(str, i, space_chars, true)
|
||||
-- Empty / end of object?
|
||||
if str:sub(i, i) == "}" then
|
||||
i = i + 1
|
||||
break
|
||||
end
|
||||
-- Read key
|
||||
if str:sub(i, i) ~= '"' then
|
||||
decode_error(str, i, "expected string for key")
|
||||
end
|
||||
key, i = parse(str, i)
|
||||
-- Read ':' delimiter
|
||||
i = next_char(str, i, space_chars, true)
|
||||
if str:sub(i, i) ~= ":" then
|
||||
decode_error(str, i, "expected ':' after key")
|
||||
end
|
||||
i = next_char(str, i + 1, space_chars, true)
|
||||
-- Read value
|
||||
val, i = parse(str, i)
|
||||
-- Set
|
||||
res[key] = val
|
||||
-- Next token
|
||||
i = next_char(str, i, space_chars, true)
|
||||
local chr = str:sub(i, i)
|
||||
i = i + 1
|
||||
if chr == "}" then break end
|
||||
if chr ~= "," then decode_error(str, i, "expected '}' or ','") end
|
||||
end
|
||||
return res, i
|
||||
end
|
||||
|
||||
|
||||
local char_func_map = {
|
||||
[ '"' ] = parse_string,
|
||||
[ "0" ] = parse_number,
|
||||
[ "1" ] = parse_number,
|
||||
[ "2" ] = parse_number,
|
||||
[ "3" ] = parse_number,
|
||||
[ "4" ] = parse_number,
|
||||
[ "5" ] = parse_number,
|
||||
[ "6" ] = parse_number,
|
||||
[ "7" ] = parse_number,
|
||||
[ "8" ] = parse_number,
|
||||
[ "9" ] = parse_number,
|
||||
[ "-" ] = parse_number,
|
||||
[ "t" ] = parse_literal,
|
||||
[ "f" ] = parse_literal,
|
||||
[ "n" ] = parse_literal,
|
||||
[ "[" ] = parse_array,
|
||||
[ "{" ] = parse_object,
|
||||
}
|
||||
|
||||
|
||||
parse = function(str, idx)
|
||||
local chr = str:sub(idx, idx)
|
||||
local f = char_func_map[chr]
|
||||
if f then
|
||||
return f(str, idx)
|
||||
end
|
||||
decode_error(str, idx, "unexpected character '" .. chr .. "'")
|
||||
end
|
||||
|
||||
|
||||
function json.decode(str)
|
||||
if type(str) ~= "string" then
|
||||
error("expected argument of type string, got " .. type(str))
|
||||
end
|
||||
local res, idx = parse(str, next_char(str, 1, space_chars, true))
|
||||
idx = next_char(str, idx, space_chars, true)
|
||||
if idx <= #str then
|
||||
decode_error(str, idx, "trailing garbage")
|
||||
end
|
||||
return res
|
||||
end
|
||||
|
||||
|
||||
return json
|
||||
112
lua-server/server.fnl
Normal file
112
lua-server/server.fnl
Normal file
|
|
@ -0,0 +1,112 @@
|
|||
;; the server for pond.
|
||||
;;
|
||||
;; usage: fennel server.fnl <port>
|
||||
;;
|
||||
;; test via websocat ws://127.0.0.1:<port>
|
||||
|
||||
(local port (or (. arg 1) 0))
|
||||
(local http-server (require :http.server))
|
||||
(local http-headers (require :http.headers))
|
||||
(local websocket (require :http.websocket))
|
||||
(local json (require :json))
|
||||
|
||||
(fn log [msg]
|
||||
(assert (io.stdout:write (.. "[" (os.date "%d/%b/%Y:%H:%M:%S %z") "] " msg "\n"))))
|
||||
|
||||
;; this will be used to generate random names later
|
||||
|
||||
(local birbs
|
||||
(with-open [f (io.open "birbs.txt" "r")]
|
||||
(icollect [line (fn [] (f:read))]
|
||||
line)))
|
||||
|
||||
(fn table-length [tbl]
|
||||
(accumulate [n 0 _ _ (pairs tbl)] (+ n 1)))
|
||||
|
||||
(local open-sockets {})
|
||||
|
||||
;; this handler contains the main logic. it is called further down in this
|
||||
;; file, as soon as a websocket connection has been established.
|
||||
|
||||
(fn handle-websocket [ws]
|
||||
(assert (ws:accept))
|
||||
; connection is open; pick a random name and make sur eit is not reused
|
||||
(local i (math.random (table-length birbs)))
|
||||
(local name (string.lower (table.remove birbs i)))
|
||||
; register this socket so other sockets can send messages to it
|
||||
(tset open-sockets name ws)
|
||||
(log (.. name " joined" ))
|
||||
(local greeting (json.encode {:type "presence-information"
|
||||
:others (- (table-length open-sockets) 1)}))
|
||||
(each [_ ws (pairs open-sockets)]
|
||||
(ws:send greeting))
|
||||
(var closed? false)
|
||||
; receive loop
|
||||
(while (not closed?)
|
||||
(local (data opcode) (ws:receive))
|
||||
(if data
|
||||
; handle incoming messages; since this is mostly a relay, we're trying
|
||||
; to make sure no junk is sent around
|
||||
(do
|
||||
(assert (= opcode :text))
|
||||
(assert (string.match data "ripple"))
|
||||
(assert (< (string.len data) 1000))
|
||||
(log (.. "relaying message for " name ": " data))
|
||||
(each [other-name ws (pairs open-sockets)]
|
||||
(when (not= name other-name)
|
||||
(ws:send data))))
|
||||
; connection has been closed. time for cleanup
|
||||
(do
|
||||
(log (.. name " left"))
|
||||
(ws:close)
|
||||
(tset open-sockets name nil) ; close connection
|
||||
(local goodbye (json.encode {:type "presence-information"
|
||||
:others (- (table-length open-sockets) 1)}))
|
||||
(each [_ ws (pairs open-sockets)]
|
||||
(ws:send goodbye))
|
||||
(table.insert birbs name) ; name is available again
|
||||
(set closed? true)))))
|
||||
|
||||
;; this is the low-level server code. it's an adapted version of
|
||||
;; https://github.com/daurnimator/lua-http/blob/ddab2835/examples/server_hello.lua
|
||||
|
||||
(local server
|
||||
(assert (http-server.listen {:host :localhost
|
||||
:onerror (fn [server context op err errno]
|
||||
(var msg (.. op " on " (tostring context) " failed"))
|
||||
(when err
|
||||
(set msg (.. msg ": " (tostring err))))
|
||||
(assert (io.stderr:write msg "\n")))
|
||||
:onstream (fn [server stream]
|
||||
(let [headers (assert (stream:get_headers))
|
||||
method (headers:get ":method")]
|
||||
;; log request
|
||||
(log (string.format "\"%s %s HTTP/%g\" \"%s\" \"%s\""
|
||||
(or method "")
|
||||
(or (headers:get ":path") "")
|
||||
stream.connection.version
|
||||
(or (headers:get :referer) "-")
|
||||
(or (headers:get :user-agent) "-")))
|
||||
;; start and handle websocket connection
|
||||
(local ws (websocket.new_from_stream stream headers))
|
||||
(if ws
|
||||
(handle-websocket ws)
|
||||
;; if we couldn't establish the websocket connection, something's wrong
|
||||
(assert (stream:write_headers (doto (http-headers.new)
|
||||
(: :append ::status :400)) true)))))
|
||||
: port})))
|
||||
|
||||
(assert (server:listen))
|
||||
|
||||
(let [(_ _ bound-port) (server:localname)]
|
||||
(log (.. "Now listening on port " bound-port)))
|
||||
|
||||
;; automatically start server when run from the command line
|
||||
(when (> (length arg) 0)
|
||||
(assert (server:loop)))
|
||||
|
||||
(comment
|
||||
;; run this to handle a response manually
|
||||
(for [i 1 3]
|
||||
(server:step))
|
||||
)
|
||||
Loading…
Add table
Add a link
Reference in a new issue