WIP: Add service discovery

packages/services/Makefile

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+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=services
+PKG_VERSION=$(GIT_COMMIT_DATE)-$(GIT_COMMIT_TSTAMP)
+GIT_COMMIT_DATE:=$(shell git log -n 1 --pretty=%ad --date=short . )
+GIT_COMMIT_TSTAMP:=$(shell git log -n 1 --pretty=%at . )
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/$(PKG_NAME)
+  SUBMENU:=Services
+  SECTION:=net
+  CATEGORY:=Network
+  MAINTAINER:=Luandro <[email protected]>
+  TITLE:=Service discovery
+  DEPENDS:=
+  PKGARCH:=all
+endef
+
+define Package/$(PKG_NAME)/description
+	Services discovery for Community Networks.
+endef
+
+define Build/Compile
+endef
+
+define Package/$(PKG_NAME)/install
+	$(INSTALL_DIR) $(1)/
+	$(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,$(PKG_NAME)))

packages/services/README.md

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+# Discoverable Services
+
+## What
+
+Exposes a `name`, `description`, `icon` and `ui` (port and path) for each service which had `APP_NAME`, `APP_DESCRIPTION`, `APP_ICON`, `APP_UI` addded to their [Balena environments]().
+
+Should also accept other formats for Docker, docker-compose or native server setups, according to a manifest format.
+
+## Architecture
+
+1. Check connect clients on `/tmp/dhcp.leases`
+1. For each client do `wget` on port `48484`
+1. If json reponse, save it to `/tmp/services/{ip}.json`
+1. Parse json and save a pruned version to `/www/cgi-bin/services`
+1. Lime-App or other community-portals can easily fetch services data from `thisnode.info/www/cgi-bin/services`
+
+## Opinions
+- [Balena](https://balena.io) will be highly encouraged because:
+  - [Balena Hub](https://hub.balena.io/) has a growing number of out-of-the-box apps
+  - [Balena Cloud](https://balena-cloud.com) is free as long as project is published and used from Balena Hub
+  - simple migration from existing docker/docker-compose stack
+  - lightweight container-based operating system
+  - support for various types of single-board-computers and architectures
+  - over-the-air-updates
+  - small self-updating images
+  - per-device release pinning
+  - bulk monitoring of all devices and their services
+  - remote access to all devices and services via web terminal
+  - ssh tunnel & remote support
+- Other docker stacks can work by adding an additional thin httpd image exposing the services manifest
+- Native stacks can work by exposing services manifest
+
+## Challenges
+
+- Offline
+  - [Balena offline updates](https://www.balena.io/blog/offline-updates-make-it-easier-to-update-balena-devices-without-the-internet/)

packages/services/files/etc/config/services

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+config base_config 'base_config'
+    option enabled '0'

packages/services/files/etc/init.d/services

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+#!/bin/sh /etc/rc.common
+
+START=99
+NAME=services
+PROG=/usr/bin/services
+
+start() {
+    if  [ $(uci get services.base_config.enabled) == 1 ]; then
+        logger -t services "Running services"
+        $PROG
+        # start
+    else
+        logger -t services "Services is disabled"
+    fi
+}
+
+stop () {
+    # stop
+    $PROG stop
+    logger -t pirania "Services stopped"
+}

packages/services/files/etc/uci-defaults/90-services-cron

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+#!/bin/sh
+
+unique_append()
+{
+	grep -qF "$1" "$2" || echo "$1" >> "$2"
+}
+
+unique_append \
+	'*/10 * * * * ((services update &> /dev/null)&)'\
+	/etc/crontabs/root
+
+exit 0

packages/services/files/usr/bin/services

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+#!/bin/sh
+
+update_services () {
+}
+
+# check if services are enabled in /etc/config/services
+enabled=$(uci get services.base_config.enabled)
+
+if  [ "$1" = "start" ]; then
+	echo "Running services"
+	update_services
+	exit
+elif [ "$1" = "update" ] ; then
+	update_services
+	exit
+elif [ "$enabled" = "1" ]; then
+	update_services
+	exit
+else
+	echo "Services are disabled. Try running services start"
+	exit
+
+fi
+

packages/services/files/usr/lib/lua/services/main.lua

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+#!/bin/lua
+
+local utils = require('lime.utils')
+
+function services.list()
+    local services = {}
+    -- clients = read('/etc/dhcp.leases').get_ip()
+	-- mkirp /tmp/services
+	-- data = []
+	-- for client in $(clients) ; do
+	-- 	wget $client/v2/local/target-state proxy=on http_proxy=$client:48484 -O /tmp/services/$client.json
+	-- 	uci pirania set whitelist for $client?
+	-- done
+	-- for $server in $(/tmp/services/*)
+	-- 	finalServer = {}
+	-- 	services = []
+	-- 	server = json.parse(server)
+	-- 	finalServer.name = server.name
+	-- 	finalServer.id = server.id
+	-- 	finalServer.device = server.device
+	-- 	server.apps.map(app => finalServer.apps = name, ui, service, description, icon)
+	-- 	finalServer.apps = services
+	-- 	data.push(finalServer)
+	-- done
+	-- write(data, '/www/cgi-bin/services')
+end
+
+return services

packages/services/files/usr/libexec/rpcd/services

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+#!/usr/bin/env lua
+--[[
+Copyright 2022 Luandro <[email protected]>
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-3.0
+]]--
+local ubus = require "ubus"
+local json = require 'luci.jsonc'
+local uci = require 'uci'
+local services = require('services.main')
+local utils = require('lime.utils')
+local config = require('lime.config')
+
+local uci_cursor = config.get_uci_cursor()
+
+local conn = ubus.connect()
+if not conn then
+    error("Failed to connect to ubus")
+end
+
+local function list_services()
+    -- services.list()
+    return utils.printJson({ status = 'ok', services = {}})
+    -- return utils.printJson({ status = services and 'ok' or 'error', services = services })
+end
+
+local methods = {
+    list = { no_params = 0 },
+}
+
+if arg[1] == 'list' then
+    utils.printJson(methods)
+end
+
+if arg[1] == 'call' then
+  local msg = utils.rpcd_readline()
+  msg = json.parse(msg)
+  if       arg[2] == 'list'	then list_services(msg)
+  else     utils.printJson({ error = "Method not found" })
+  end
+end

packages/services/files/usr/share/rpcd/acl.d/services.json

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+{
+    "unauthenticated": {
+        "description": "services voucher public access",
+        "write": {
+            "ubus": {
+                    "services": ["list"]
+            }
+        }
+    },
+    "lime-app": {
+        "description": "lime-app public access",
+        "read": {
+            "ubus": {
+                    "services": ["list"]
+            }
+        }
+    },
+    "root": {
+        "description": "services administration access",
+        "write": {
+            "ubus": {
+                    "services": ["*"]
+            }
+        },
+        "read": {
+            "ubus": {
+                    "services": ["*"]
+            }
+        }
+    }
+}