cp.nvim/lua/cp/scraper.lua
Barrett Ruth a202725cc5
fix(submit): use file path over stdin; fix CF CodeMirror textarea (#305)
## Problem

After the initial submit hardening, two issues remained: source code was
read in Lua and piped as stdin to the scraper (unnecessary roundtrip
since
the file exists on disk), and CF's `page.fill()` timed out on the hidden
`textarea[name="source"]` because CodeMirror owns the editor state.

## Solution

Pass the source file path as a CLI arg instead — AtCoder calls
`page.set_input_files(file_path)` directly, CF reads it with
`Path(file_path).read_text()`. Fix CF source injection via
`page.evaluate()`
into the CodeMirror instance. Extract `BROWSER_SUBMIT_NAV_TIMEOUT` as a
per-platform `defaultdict` (CF defaults to 2× nav timeout). Save the
buffer
with `vim.cmd.update()` before submitting.
2026-03-05 14:34:14 -05:00

360 lines
9.8 KiB
Lua

local M = {}
local constants = require('cp.constants')
local logger = require('cp.log')
local utils = require('cp.utils')
local function syshandle(result)
local ok, data = pcall(vim.json.decode, result.stdout or '')
if ok then
return { success = true, data = data }
end
if result.code ~= 0 then
local msg = 'Scraper failed: ' .. (result.stderr or 'Unknown error')
return { success = false, error = msg }
end
local msg = 'Failed to parse scraper output: ' .. tostring(data)
logger.log(msg, { level = vim.log.levels.ERROR })
return { success = false, error = msg }
end
---@param env_map table<string, string>
---@return string[]
local function spawn_env_list(env_map)
local out = {}
for key, value in pairs(env_map) do
out[#out + 1] = tostring(key) .. '=' .. tostring(value)
end
return out
end
---@param platform string
---@param subcommand string
---@param args string[]
---@param opts { sync?: boolean, ndjson?: boolean, on_event?: fun(ev: table), on_exit?: fun(result: table), env_extra?: table<string, string>, stdin?: string }
local function run_scraper(platform, subcommand, args, opts)
if not utils.setup_python_env() then
local msg = 'no Python environment available (install uv or nix)'
logger.log(msg, { level = vim.log.levels.ERROR })
if opts and opts.on_exit then
opts.on_exit({ success = false, error = msg })
end
return { success = false, error = msg }
end
if subcommand == 'submit' then
utils.setup_nix_submit_env()
end
local plugin_path = utils.get_plugin_path()
local cmd
if subcommand == 'submit' then
cmd = utils.get_python_submit_cmd(platform, plugin_path)
else
cmd = utils.get_python_cmd(platform, plugin_path)
end
vim.list_extend(cmd, { subcommand })
vim.list_extend(cmd, args)
logger.log('scraper cmd: ' .. table.concat(cmd, ' '))
local env = vim.fn.environ()
env.VIRTUAL_ENV = ''
env.PYTHONPATH = ''
env.CONDA_PREFIX = ''
if opts and opts.env_extra then
for k, v in pairs(opts.env_extra) do
env[k] = v
end
end
if subcommand == 'submit' and utils.is_nix_build() then
env.UV_PROJECT_ENVIRONMENT = vim.fn.stdpath('cache') .. '/cp-nvim/submit-env'
end
if opts and opts.ndjson then
local uv = vim.uv
local stdin_pipe = nil
if opts.stdin then
stdin_pipe = uv.new_pipe(false)
end
local stdout = uv.new_pipe(false)
local stderr = uv.new_pipe(false)
local buf = ''
local timer = nil
local handle
handle = uv.spawn(cmd[1], {
args = vim.list_slice(cmd, 2),
stdio = { stdin_pipe, stdout, stderr },
env = spawn_env_list(env),
cwd = plugin_path,
}, function(code, signal)
if timer and not timer:is_closing() then
timer:stop()
timer:close()
end
if buf ~= '' and opts.on_event then
local ok_tail, ev_tail = pcall(vim.json.decode, buf)
if ok_tail then
opts.on_event(ev_tail)
end
buf = ''
end
if opts.on_exit then
opts.on_exit({ success = (code == 0), code = code, signal = signal })
end
if stdin_pipe and not stdin_pipe:is_closing() then
stdin_pipe:close()
end
if not stdout:is_closing() then
stdout:close()
end
if not stderr:is_closing() then
stderr:close()
end
if handle and not handle:is_closing() then
handle:close()
end
end)
if not handle then
if stdin_pipe and not stdin_pipe:is_closing() then
stdin_pipe:close()
end
logger.log('Failed to start scraper process', { level = vim.log.levels.ERROR })
return { success = false, error = 'spawn failed' }
end
if subcommand == 'submit' then
timer = uv.new_timer()
timer:start(120000, 0, function()
timer:stop()
timer:close()
if stdin_pipe and not stdin_pipe:is_closing() then
stdin_pipe:close()
end
if not stdout:is_closing() then
stdout:close()
end
if not stderr:is_closing() then
stderr:close()
end
if handle and not handle:is_closing() then
handle:kill(15)
handle:close()
end
if opts.on_exit then
opts.on_exit({ success = false, error = 'submit timed out' })
end
end)
end
if stdin_pipe then
uv.write(stdin_pipe, opts.stdin, function()
uv.shutdown(stdin_pipe, function()
stdin_pipe:close()
end)
end)
end
uv.read_start(stdout, function(_, data)
if data == nil then
if buf ~= '' and opts.on_event then
local ok_tail, ev_tail = pcall(vim.json.decode, buf)
if ok_tail then
opts.on_event(ev_tail)
end
buf = ''
end
return
end
buf = buf .. data
while true do
local s, e = buf:find('\n', 1, true)
if not s then
break
end
local line = buf:sub(1, s - 1)
buf = buf:sub(e + 1)
local ok, ev = pcall(vim.json.decode, line)
if ok and opts.on_event then
opts.on_event(ev)
end
end
end)
uv.read_start(stderr, function(_, _) end)
return
end
local sysopts = {
text = true,
timeout = (subcommand == 'submit') and 120000 or 30000,
env = env,
cwd = plugin_path,
}
if opts and opts.stdin then
sysopts.stdin = opts.stdin
end
if opts and opts.sync then
local result = vim.system(cmd, sysopts):wait()
return syshandle(result)
else
vim.system(cmd, sysopts, function(result)
if opts and opts.on_exit then
return opts.on_exit(syshandle(result))
end
end)
end
end
function M.scrape_contest_metadata(platform, contest_id, callback)
run_scraper(platform, 'metadata', { contest_id }, {
on_exit = function(result)
if not result or not result.success then
logger.log(
("Failed to scrape metadata for %s contest '%s'."):format(
constants.PLATFORM_DISPLAY_NAMES[platform],
contest_id
),
{ level = vim.log.levels.ERROR }
)
return
end
local data = result.data or {}
if not data.problems or #data.problems == 0 then
logger.log(
("No problems returned for %s contest '%s'."):format(
constants.PLATFORM_DISPLAY_NAMES[platform],
contest_id
),
{ level = vim.log.levels.ERROR }
)
return
end
if type(callback) == 'function' then
callback(data)
end
end,
})
end
function M.scrape_contest_list(platform)
local result = run_scraper(platform, 'contests', {}, { sync = true })
if not result or not result.success or not (result.data and result.data.contests) then
logger.log(
('Could not scrape contests list for platform %s: %s'):format(
platform,
(result and result.error) or 'unknown'
),
{ level = vim.log.levels.ERROR }
)
return {}
end
return result.data.contests
end
---@param platform string
---@param contest_id string
---@param callback fun(data: table)|nil
---@param on_done fun()|nil
function M.scrape_all_tests(platform, contest_id, callback, on_done)
run_scraper(platform, 'tests', { contest_id }, {
ndjson = true,
on_exit = function()
if type(on_done) == 'function' then
vim.schedule(on_done)
end
end,
on_event = function(ev)
if ev.done then
return
end
if ev.error and ev.problem_id then
logger.log(
("Failed to load tests for problem '%s' in contest '%s': %s"):format(
ev.problem_id,
contest_id,
ev.error
),
{ level = vim.log.levels.WARN }
)
return
end
if not ev.problem_id or not ev.tests then
return
end
vim.schedule(function()
require('cp.utils').ensure_dirs()
local config = require('cp.config')
local base_name = config.default_filename(contest_id, ev.problem_id)
for i, t in ipairs(ev.tests) do
local input_file = 'io/' .. base_name .. '.' .. i .. '.cpin'
local expected_file = 'io/' .. base_name .. '.' .. i .. '.cpout'
local input_content = t.input:gsub('\r', '')
local expected_content = t.expected:gsub('\r', '')
vim.fn.writefile(vim.split(input_content, '\n'), input_file)
vim.fn.writefile(vim.split(expected_content, '\n'), expected_file)
end
if type(callback) == 'function' then
callback({
combined = ev.combined,
tests = ev.tests,
timeout_ms = ev.timeout_ms or 0,
memory_mb = ev.memory_mb or 0,
interactive = ev.interactive or false,
multi_test = ev.multi_test or false,
precision = ev.precision ~= vim.NIL and ev.precision or nil,
problem_id = ev.problem_id,
})
end
end)
end,
})
end
function M.submit(
platform,
contest_id,
problem_id,
language,
source_file,
credentials,
on_status,
callback
)
local done = false
run_scraper(platform, 'submit', { contest_id, problem_id, language, source_file }, {
ndjson = true,
env_extra = { CP_CREDENTIALS = vim.json.encode(credentials) },
on_event = function(ev)
if ev.credentials ~= nil then
require('cp.cache').set_credentials(platform, ev.credentials)
end
if ev.status ~= nil then
if type(on_status) == 'function' then
on_status(ev)
end
elseif ev.success ~= nil then
done = true
if type(callback) == 'function' then
callback(ev)
end
end
end,
on_exit = function(proc)
if not done and type(callback) == 'function' then
callback({
success = false,
error = 'submit process exited (code=' .. tostring(proc.code) .. ')',
})
end
end,
})
end
return M