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# Jamstack::Live (R4, desktop slice): a read-mostly .live/<token>/ file mount the
# game writes itself — no relay, no WS. A file-based agent drops raw-Ruby command
# files and reads JSON results; status + the game-console are written for tailing.
# Drained in-frame on the main thread (P6), reusing Bridge.eval_code (R1).
# Gate: JAMSTACK_BRIDGE=1. Token: JAMSTACK_LIVE (default "dev"), root:
# JAMSTACK_LIVE_ROOT (default ".live"). See .agents/knowledge/live-mount.md.
#
# Protocol (no JSON parser in mruby): cmd files carry RAW Ruby, id is the filename;
# only results are JSON.
# .live/dev/.agent/cmd-<id>.rb (agent writes; atomic: .tmp then rename)
# .live/dev/.agent/result-<id>.json (game writes {id,ok,result,stdout,error,backtrace})
module Jamstack
module Live
STATUS_EVERY = 30 # frames between status.json rewrites (~0.5s @ 60fps)
EVAL_SH = [
'#!/bin/sh',
'# Run Ruby in the live game; prints the JSON result envelope.',
'# usage: sh bin/eval "Rl.get_fps"',
'ag="$(cd "$(dirname "$0")/.." && pwd)/.agent"',
'id="p$$_$(date +%s%N 2>/dev/null || date +%s)"',
'printf "%s" "$1" > "$ag/.tmp-$id"',
'mv "$ag/.tmp-$id" "$ag/cmd-$id.rb"',
'i=0',
'while [ $i -lt 250 ]; do',
' if [ -f "$ag/result-$id.json" ]; then',
' cat "$ag/result-$id.json"; echo; rm -f "$ag/result-$id.json"; exit 0',
' fi',
' i=$((i + 1)); sleep 0.02',
'done',
'echo "{\"ok\":false,\"error\":\"timeout waiting for result\"}" >&2; exit 1',
].join("\n") + "\n"
TAIL_SH = [
'#!/bin/sh',
'# Stream the game-console (NDJSON). usage: sh bin/tail-log [N]',
'd="$(cd "$(dirname "$0")/.." && pwd)"',
'exec tail -n "${1:-40}" -f "$d/game-console"',
].join("\n") + "\n"
HOT_SH = [
'#!/bin/sh',
'# Hot-reload a systems file. usage: sh bin/hot-reload game/systems/move.rb',
'exec "$(dirname "$0")/eval" "Flecs::Hot.reload_file(\"$1\")"',
].join("\n") + "\n"
SNAP_SH = [
'#!/bin/sh',
'# Dump the flecs world state to state.json and print the JSON.',
'# usage: sh bin/snapshot (requires $flecs.enable_rest in game code)',
'exec "$(dirname "$0")/eval" \'Jamstack::Live.snapshot\'',
].join("\n") + "\n"
QUERY_SH = [
'#!/bin/sh',
'# Query the flecs world. usage: sh bin/query Position',
'# (requires $flecs.enable_rest in game code; expr is a flecs query expr)',
'exec "$(dirname "$0")/eval" "Flecs::Hot.world.rest_request(\"GET\",\"/query?expr=$1&values=true\",\"\")"',
].join("\n") + "\n"
@active = false
@dir = nil
@agent = nil
@throttle = 0
class << self
def active?; @active; end
def dir; @dir; end
def start
return if @active
token = nonempty(Jamstack.getenv('JAMSTACK_LIVE'), 'dev')
root = nonempty(Jamstack.getenv('JAMSTACK_LIVE_ROOT'), '.live')
@dir = File.join(root, token)
@agent = File.join(@dir, '.agent')
mkdir_p(@agent)
mkdir_p(File.join(@dir, 'bin'))
clean_agent
write_bin_scripts
Jamstack::Log.open_file(File.join(@dir, 'game-console'))
@active = true
write_status
Jamstack::Log.info("live mount ready", tag: "live", dir: @dir)
rescue Exception => e
@active = false
Jamstack::Log.exception(e, tag: "live")
end
# Per frame, after Bridge.drain: run any queued command files, refresh status.
def poll
return unless @active
process_commands
@throttle += 1
if @throttle >= STATUS_EVERY
@throttle = 0
write_status
end
end
# Dump the flecs world state to state.json (called by bin/snapshot).
# Uses the flecs REST API in-process (requires enable_rest on the world).
def snapshot
world = Flecs::Hot.world
return nil unless world
json = world.rest_request("GET", "/world", "")
write_state(json)
json
rescue Exception => e
Jamstack::Log.exception(e, tag: "live")
nil
end
private
def nonempty(v, default); (v && !v.empty?) ? v : default; end
def now; Time.now.to_f; rescue StandardError; 0.0; end
def process_commands
entries = (Dir.entries(@agent) rescue [])
entries.select { |f| f.start_with?("cmd-") }.sort.each do |f|
id = f[4..-1] # after "cmd-"
id = id[0...-3] if id.end_with?(".rb")
path = File.join(@agent, f)
code = (File.read(path) rescue nil)
delete(path) # consume once
next if code.nil?
env = Jamstack::Bridge.eval_code(code)
write_atomic(File.join(@agent, "result-#{id}.json"),
Jamstack::JSON.generate(
"id" => id, "ok" => env[:ok], "result" => env[:result],
"stdout" => env[:stdout], "error" => env[:error],
"backtrace" => env[:backtrace]))
end
end
def write_status
write_atomic(File.join(@dir, 'status.json'),
Jamstack::JSON.generate(
"connected" => true,
"target" => (Rl.web? ? "web" : "desktop"),
"token" => File.basename(@dir),
"frame" => Jamstack::Log.frame,
"fps" => (Rl.get_fps rescue 0),
"ts" => now))
end
def write_state(json)
write_atomic(File.join(@dir, 'state.json'), json)
end
def write_bin_scripts
bin = File.join(@dir, 'bin')
{ 'eval' => EVAL_SH, 'tail-log' => TAIL_SH, 'hot-reload' => HOT_SH,
'snapshot' => SNAP_SH, 'query' => QUERY_SH }.each do |name, body|
p = File.join(bin, name)
File.open(p, 'w') { |fh| fh.write(body) }
(File.chmod(0755, p) rescue nil)
end
end
def clean_agent
(Dir.entries(@agent) rescue []).each do |f|
next if f == "." || f == ".."
delete(File.join(@agent, f)) if f.start_with?("cmd-") || f.start_with?("result-") || f.start_with?(".tmp")
end
end
# recursive mkdir (mruby has no mkdir -p)
def mkdir_p(path)
acc = path.start_with?("/") ? "" : nil
path.split("/").each do |part|
next if part.empty?
acc = acc.nil? ? part : "#{acc}/#{part}"
(Dir.mkdir(acc) unless File.directory?(acc)) rescue nil
end
end
def write_atomic(path, str)
tmp = "#{path}.tmp"
File.open(tmp, 'w') { |fh| fh.write(str) }
File.rename(tmp, path)
rescue Exception => e
Jamstack::Log.exception(e, tag: "live", path: path.to_s) rescue nil
end
def delete(path)
File.delete(path)
rescue StandardError
(File.unlink(path) rescue nil)
end
end
end
end
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