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local EventEmitter = require "mason-core.EventEmitter"
local Optional = require "mason-core.optional"
local _ = require "mason-core.functional"
local a = require "mason-core.async"
local log = require "mason-core.log"
local platform = require "mason-core.platform"
local process = require "mason-core.process"
local spawn = require "mason-core.spawn"
local uv = vim.loop
---@alias InstallHandleState
--- | '"IDLE"'
--- | '"QUEUED"'
--- | '"ACTIVE"'
--- | '"CLOSED"'
---@class InstallHandleSpawnHandle
---@field uv_handle luv_handle
---@field pid integer
---@field cmd string
---@field args string[]
local InstallHandleSpawnHandle = {}
InstallHandleSpawnHandle.__index = InstallHandleSpawnHandle
---@param luv_handle luv_handle
---@param pid integer
---@param cmd string
---@param args string[]
function InstallHandleSpawnHandle:new(luv_handle, pid, cmd, args)
---@type InstallHandleSpawnHandle
local instance = {}
setmetatable(instance, InstallHandleSpawnHandle)
instance.uv_handle = luv_handle
instance.pid = pid
instance.cmd = cmd
instance.args = args
return instance
end
function InstallHandleSpawnHandle:__tostring()
return ("%s %s"):format(self.cmd, table.concat(self.args, " "))
end
---@class InstallHandle : EventEmitter
---@field package Package
---@field state InstallHandleState
---@field stdio { buffers: { stdout: string[], stderr: string[] }, sink: StdioSink }
---@field is_terminated boolean
---@field private spawn_handles InstallHandleSpawnHandle[]
local InstallHandle = {}
InstallHandle.__index = InstallHandle
setmetatable(InstallHandle, { __index = EventEmitter })
---@param handle InstallHandle
local function new_sink(handle)
local stdout, stderr = {}, {}
return {
buffers = { stdout = stdout, stderr = stderr },
sink = {
stdout = function(chunk)
stdout[#stdout + 1] = chunk
handle:emit("stdout", chunk)
end,
stderr = function(chunk)
stderr[#stderr + 1] = chunk
handle:emit("stderr", chunk)
end,
},
}
end
---@param pkg Package
function InstallHandle:new(pkg)
local instance = EventEmitter.new(self)
instance.state = "IDLE"
instance.package = pkg
instance.spawn_handles = {}
instance.stdio = new_sink(instance)
instance.is_terminated = false
return instance
end
---@param luv_handle luv_handle
---@param pid integer
---@param cmd string
---@param args string[]
function InstallHandle:register_spawn_handle(luv_handle, pid, cmd, args)
local spawn_handles = InstallHandleSpawnHandle:new(luv_handle, pid, cmd, args)
log.fmt_trace("Pushing spawn_handles stack for %s: %s (pid: %s)", self, spawn_handles, pid)
self.spawn_handles[#self.spawn_handles + 1] = spawn_handles
self:emit "spawn_handles:change"
end
---@param luv_handle luv_handle
function InstallHandle:deregister_spawn_handle(luv_handle)
for i = #self.spawn_handles, 1, -1 do
if self.spawn_handles[i].uv_handle == luv_handle then
log.fmt_trace("Popping spawn_handles stack for %s: %s", self, self.spawn_handles[i])
table.remove(self.spawn_handles, i)
self:emit "spawn_handles:change"
return true
end
end
return false
end
---@return Optional # Optional<InstallHandleSpawnHandle>
function InstallHandle:peek_spawn_handle()
return Optional.of_nilable(self.spawn_handles[#self.spawn_handles])
end
function InstallHandle:is_idle()
return self.state == "IDLE"
end
function InstallHandle:is_queued()
return self.state == "QUEUED"
end
function InstallHandle:is_active()
return self.state == "ACTIVE"
end
function InstallHandle:is_closed()
return self.state == "CLOSED"
end
function InstallHandle:is_closing()
return self:is_closed() or self.is_terminated
end
---@param new_state InstallHandleState
function InstallHandle:set_state(new_state)
local old_state = self.state
self.state = new_state
log.fmt_trace("Changing %s state from %s to %s", self, old_state, new_state)
self:emit("state:change", new_state, old_state)
end
---@param signal integer
function InstallHandle:kill(signal)
assert(not self:is_closed(), "Cannot kill closed handle.")
log.fmt_trace("Sending signal %s to luv handles in %s", signal, self)
for _, spawn_handles in pairs(self.spawn_handles) do
process.kill(spawn_handles.uv_handle, signal)
end
self:emit("kill", signal)
end
---@param pid integer
local win_taskkill = a.scope(function(pid)
spawn.taskkill {
"/f",
"/t",
"/pid",
pid,
}
end)
function InstallHandle:terminate()
assert(not self:is_closed(), "Cannot terminate closed handle.")
if self.is_terminated then
log.fmt_trace("Handle is already terminated %s", self)
return
end
log.fmt_trace("Terminating %s", self)
-- https://github.com/libuv/libuv/issues/1133
if platform.is.win then
for _, spawn_handles in ipairs(self.spawn_handles) do
win_taskkill(spawn_handles.pid)
end
else
self:kill(15) -- SIGTERM
end
self.is_terminated = true
self:emit "terminate"
local check = uv.new_check()
check:start(function()
for _, spawn_handles in ipairs(self.spawn_handles) do
local luv_handle = spawn_handles.uv_handle
local ok, is_closing = pcall(luv_handle.is_closing, luv_handle)
if ok and not is_closing then
return
end
end
check:stop()
if not self:is_closed() then
self:close()
end
end)
end
function InstallHandle:queued()
assert(self:is_idle(), "Can only queue idle handles.")
self:set_state "QUEUED"
end
function InstallHandle:active()
assert(self:is_idle() or self:is_queued(), "Can only activate idle or queued handles.")
self:set_state "ACTIVE"
end
function InstallHandle:close()
log.fmt_trace("Closing %s", self)
assert(not self:is_closed(), "Handle is already closed.")
for _, spawn_handles in ipairs(self.spawn_handles) do
local luv_handle = spawn_handles.uv_handle
local ok, is_closing = pcall(luv_handle.is_closing, luv_handle)
if ok then
assert(is_closing, "There are open libuv handles.")
end
end
self.spawn_handles = {}
self:set_state "CLOSED"
self:emit "closed"
self:__clear_event_handlers()
end
function InstallHandle:__tostring()
return ("InstallHandle(package=%s, state=%s)"):format(self.package, self.state)
end
return InstallHandle
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