From 90b4fa9e7e84c6f228810f8f0f05995c3c5f798a Mon Sep 17 00:00:00 2001
From: "Bastian (BaM)" <git@noxware.de>
Date: Sun, 14 Sep 2025 10:49:11 +0200
Subject: [PATCH] Add lua log watcher script and update Dockerfile to include
 lua dependencies

---
 Dockerfile                        |   2 +-
 compose.yaml                      |   1 +
 scripts/auto-boot-ollama-host.lua | 102 ++++++++++++++++++++++++++++++
 3 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 scripts/auto-boot-ollama-host.lua

diff --git a/Dockerfile b/Dockerfile
index 911ba01..6d919f6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ FROM alpine:3.20
 # Install minimal tooling
 RUN apk add --no-cache \
 	--repository=https://dl-cdn.alpinelinux.org/alpine/edge/testing wol \
-	&& apk add --no-cache bash curl ca-certificates docker-cli
+	&& apk add --no-cache bash curl ca-certificates docker-cli lua5.4 lua5.4-socket
 
 # Copy script
 WORKDIR /app
diff --git a/compose.yaml b/compose.yaml
index 5b00be1..414a51c 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -13,4 +13,5 @@ services:
       WOL_PORT: "${WOL_PORT:-9}"                    # optional
     restart: unless-stopped
     volumes:
+      - /etc/localtime:/etc/localtime:ro
       - /var/run/docker.sock:/var/run/docker.sock:ro
\ No newline at end of file
diff --git a/scripts/auto-boot-ollama-host.lua b/scripts/auto-boot-ollama-host.lua
new file mode 100644
index 0000000..765b3f7
--- /dev/null
+++ b/scripts/auto-boot-ollama-host.lua
@@ -0,0 +1,102 @@
+-- Purpose: Minimal log watcher using `docker logs -f` as input.
+-- Requirements: lua 5.4 + luasocket + docker CLI inside the container.
+-- Notes:
+-- - Pattern match is plain substring (fast & simple).
+-- - Optional Wake-on-LAN is native (no external tools).
+-- - Optional port-wait is provided but commented out (mirrors original bash idea).
+
+local socket = require("socket")
+
+local function getenv(name, def)
+  local v = os.getenv(name)
+  return (v ~= nil and v ~= "") and v or def
+end
+
+-- ---- Config via env ----
+local CONTAINER_NAME = getenv("CONTAINER_NAME", "paperless-ai")
+local SINCE          = getenv("SINCE", "0s")
+local OLLAMA_HOST    = getenv("OLLAMA_HOST", "192.168.222.12")
+local OLLAMA_PORT    = tonumber(getenv("OLLAMA_PORT", "11434"))
+local ERROR_PATTERN  = getenv(
+  "ERROR_PATTERN",
+  ("Error: [ERROR] Document analysis failed: connect EHOSTUNREACH %s:%d"):format(OLLAMA_HOST, OLLAMA_PORT)
+)
+
+-- Optional Wake-on-LAN
+local WOL_MAC   = getenv("WOL_MAC", "")                       -- e.g. "AA:BB:CC:DD:EE:FF"
+local WOL_BCAST = getenv("WOL_BCAST", "255.255.255.255")
+local WOL_PORT  = tonumber(getenv("WOL_PORT", "9"))
+
+-- Optional: wait for service to come up (kept commented to stay minimal)
+-- local UP_WAIT_TIMEOUT = tonumber(getenv("UP_WAIT_TIMEOUT", "90"))
+
+local function log(msg)
+  io.stdout:write(os.date("[%F %T] "), msg, "\n"); io.stdout:flush()
+end
+
+-- "AA:BB:CC:DD:EE:FF" -> 6 bytes
+local function mac_to_bytes(mac)
+  local bytes = {}
+  for byte in mac:gmatch("(%x%x)") do table.insert(bytes, tonumber(byte, 16)) end
+  if #bytes ~= 6 then return nil end
+  return string.char(table.unpack(bytes))
+end
+
+local function send_wol(mac_str, bcast_ip, port)
+  local mb = mac_to_bytes(mac_str)
+  if not mb then return false, "invalid MAC" end
+  local packet = string.rep(string.char(0xFF), 6) .. mb:rep(16)
+  local udp = assert(socket.udp())
+  udp:settimeout(2)
+  pcall(function() assert(udp:setoption("broadcast", true)) end)
+  local ok, err = udp:sendto(packet, bcast_ip, port)
+  udp:close()
+  return ok ~= nil, err
+end
+
+-- Kept for reference; not used to keep parity with your minimal bash
+-- local function port_is_up(host, port, timeout_sec)
+--   local deadline = socket.gettime() + (timeout_sec or 1)
+--   repeat
+--     local tcp = socket.tcp(); tcp:settimeout(1)
+--     if tcp:connect(host, port) then tcp:close(); return true end
+--     tcp:close(); socket.sleep(0.5)
+--   until socket.gettime() >= deadline
+--   return false
+-- end
+
+local function main()
+  log(("Watching container='%s' since='%s'"):format(CONTAINER_NAME, SINCE))
+  log(("Looking for pattern: %q"):format(ERROR_PATTERN))
+
+  local cmd = ("docker logs -f --since %q %q 2>&1"):format(SINCE, CONTAINER_NAME)
+  local fh = assert(io.popen(cmd, "r"))
+
+  for line in fh:lines() do
+    -- Plain substring match (no regex)
+    if line:find(ERROR_PATTERN, 1, true) ~= nil then
+      log(("Detected EHOSTUNREACH for Ollama (%s:%d)."):format(OLLAMA_HOST, OLLAMA_PORT))
+
+      if WOL_MAC ~= "" then
+        local ok, err = send_wol(WOL_MAC, WOL_BCAST, WOL_PORT)
+        if ok then
+          log(("Sent WOL to %s via %s:%d"):format(WOL_MAC, WOL_BCAST, WOL_PORT))
+        else
+          log("WOL failed: " .. tostring(err))
+        end
+      end
+
+      -- Optional wait (kept commented for minimal parity)
+      -- if port_is_up(OLLAMA_HOST, OLLAMA_PORT, UP_WAIT_TIMEOUT) then
+      --   log("Ollama reachable again.")
+      -- else
+      --   log("Timeout waiting for Ollama.")
+      -- end
+    end
+  end
+
+  fh:close()
+  log("Log stream ended.")
+end
+
+main()