--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- default-rsync.lua
--
--    Syncs with rsync ("classic" Lsyncd)
--    A (Layer 1) configuration.
--
-- Note:
--    this is infact just a configuration using Layer 1 configuration
--    like any other. It only gets compiled into the binary by default.
--    You can simply use a modified one, by copying everything into a
--    config file of yours and name it differently.
--
-- License: GPLv2 (see COPYING) or any later version
-- Authors: Axel Kittenberger <axkibe@gmail.com>
--  Pre/Post Command additions: Hugh Saunders <hugh@wherenow.org>
--
--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-- needed for executing pre/post tasks. Can't use the lsync spawn method as
-- that requires an event, and an event isn't available for the initial
-- recursive sync.
require ('os')

if not default then error( 'default not loaded' ) end

local rsync = { }

default.rsync = rsync

-- uses default collect

--
-- used to ensure there aren't typos in the keys
--
rsync.checkgauge = {

	-- unsets default user action handlers
	onCreate    =  false,
	onModify    =  false,
	onDelete    =  false,
	onStartup   =  false,
	onMove      =  false,

	delete      =  true,
	exclude     =  true,
	excludeFrom =  true,
	target      =  true,

	rsync  = {
		acls              =  true,
		archive           =  true,
		binary            =  true,
		bwlimit           =  true,
		checksum          =  true,
		compress          =  true,
		copy_links        =  true,
		cvs_exclude       =  true,
		dry_run           =  true,
		executability     =  true,
		group             =  true,
		hard_links        =  true,
		ignore_times      =  true,
		inplace           =  true,
		ipv4              =  true,
		ipv6              =  true,
		keep_dirlinks     =  true,
		links             =  true,
		one_file_system   =  true,
		owner             =  true,
		password_file     =  true,
		perms             =  true,
		protect_args      =  true,
		prune_empty_dirs  =  true,
		quiet             =  true,
		rsh               =  true,
		rsync_path        =  true,
		sparse            =  true,
		temp_dir          =  true,
		timeout           =  true,
		times             =  true,
		update            =  true,
		verbose           =  true,
		whole_file        =  true,
		xattrs            =  true,
		_extra            =  true,
		precmd            =  true,
		postcmd           =  true,
	},
}

--
-- Execute Pre/Post Command
--
prepost = function (config, prepost)
  local cmd_string = (config.rsync.rsh .. ' '
    .. string.gsub(config.target, ':.*$', '')
    .. ' "' .. config.rsync[prepost] .. '"' )
  log('Normal', 'Executing ' .. prepost .. ': ' .. cmd_string)
  os.execute(cmd_string)
end

--
-- Returns true for non Init and Blanket events.
--
local eventNotInitBlank =
	function
(
	event
)
	return event.etype ~= 'Init' and event.etype ~= 'Blanket'
end


--
-- Spawns rsync for a list of events
--
-- Exclusions are already handled by not having
-- events for them.
--
rsync.action = function
(
	inlet
)

	-- gets all events ready for syncing
	local elist = inlet.getEvents( eventNotInitBlank )

	--
	-- Replaces what rsync would consider filter rules by literals
	--
	local function sub
	(
		p  -- pattern
	)
		if not p then return end

		return p:
			gsub( '%?', '\\?' ):
			gsub( '%*', '\\*' ):
			gsub( '%[', '\\[' ):
			gsub( '%]', '\\]' )
	end

	--
	-- Gets the list of paths for the event list
	--
	-- Deletes create multi match patterns
	--
	local paths = elist.getPaths(
		function
		(
			etype,  -- event type
			path1,  -- path
			path2   -- path to for move events
		)
			if string.byte( path1, -1 ) == 47 and etype == 'Delete'
			then
				return sub( path1 )..'***', sub( path2 )
			else
				return sub( path1 ), sub( path2 )
			end
		end
	)

	-- stores all filters by integer index
	local filterI = { }

	-- stores all filters with path index
	local filterP = { }

	-- adds one path to the filter
	local function addToFilter
	(
		path
	)
		if filterP[ path ] then return end

		filterP[ path ] = true

		table.insert( filterI, path )
	end

	-- adds a path to the filter.
	--
	-- rsync needs to have entries for all steps in the path,
	-- so the file for example d1/d2/d3/f1 needs following filters:
	-- 'd1/', 'd1/d2/', 'd1/d2/d3/' and 'd1/d2/d3/f1'
	for _, path in ipairs( paths )
	do
		if path and path ~= ''
		then
			addToFilter( path )

			local pp = string.match( path, '^(.*/)[^/]+/?' )

			while pp
			do
				addToFilter( pp )

				pp = string.match( pp, '^(.*/)[^/]+/?' )
			end
		end
	end

	local filterS = table.concat( filterI, '\n'   )
	local filter0 = table.concat( filterI, '\000' )

	log(
		'Normal',
		'Calling rsync with filter-list of new/modified files/dirs\n',
		filterS
	)

	local config = inlet.getConfig( )

	local delete = nil

	if config.delete == true or config.delete == 'running'
	then
		delete = { '--delete', '--ignore-errors' }
	end

	prepost(config, 'precmd')
	spawn(
		elist,
		config.rsync.binary,
		'<', filter0,
		config.rsync._computed,
		'-r',
		delete,
		'--force',
		'--from0',
		'--include-from=-',
		'--exclude=*',
		config.source,
		config.target
	)
end


--
-- Spawns the recursive startup sync.
--
rsync.init = function
(
	event
)
	local config   = event.config

	local inlet    = event.inlet

	local excludes = inlet.getExcludes( )

	local delete   = nil

	local target   = config.target

	if not target
	then
		if not config.host
		then
			error('Internal fail, Neither target nor host is configured')
		end

		target = config.host .. ':' .. config.targetdir
	end

	if config.delete == true
	or config.delete == 'startup'
	then
		delete = { '--delete', '--ignore-errors' }
	end

	prepost(config, 'precmd')
	if #excludes == 0
	then
		-- starts rsync without any excludes
		log(
			'Normal',
			'recursive startup rsync: ',
			config.source,
			' -> ',
			target
		)

		spawn(
			event,
			config.rsync.binary,
			delete,
			config.rsync._computed,
			'-r',
			config.source,
			target
		)

	else

		-- starts rsync providing an exclusion list
		-- on stdin
		local exS = table.concat( excludes, '\n' )

		log(
			'Normal',
			'recursive startup rsync: ',
			config.source,
			' -> ',
			target,
			' excluding\n',
			exS
		)

		spawn(
			event,
			config.rsync.binary,
			'<', exS,
			'--exclude-from=-',
			delete,
			config.rsync._computed,
			'-r',
			config.source,
			target
		)
	end
end


--
-- Prepares and checks a syncs configuration on startup.
--
rsync.prepare = function
(
	config,    -- the configuration
	level,     -- additional error level for inherited use ( by rsyncssh )
	skipTarget -- used by rsyncssh, do not check for target
)

	-- First let default.prepare test the checkgauge
	default.prepare( config, level + 6 )

	if not skipTarget and not config.target
	then
		error(
			'default.rsync needs "target" configured',
			level
		)
	end

	if config.rsyncOps
	then
		error(
			'"rsyncOps" is outdated please use the new rsync = { ... } syntax.',
			level
		)
	end

	if config.rsyncOpts and config.rsync._extra
	then
		error(
			'"rsyncOpts" is outdated in favor of the new rsync = { ... } syntax\n"' +
			'for which you provided the _extra attribute as well.\n"' +
			'Please remove rsyncOpts from your config.',
			level
		)
	end

	if config.rsyncOpts
	then
		log(
			'Warn',
			'"rsyncOpts" is outdated. Please use the new rsync = { ... } syntax."'
		)

		config.rsync._extra = config.rsyncOpts
		config.rsyncOpts = nil
	end

	if config.rsyncBinary and config.rsync.binary
	then
		error(
			'"rsyncBinary is outdated in favor of the new rsync = { ... } syntax\n"'+
			'for which you provided the binary attribute as well.\n"' +
			"Please remove rsyncBinary from your config.'",
			level
		)
	end

	if config.rsyncBinary
	then
		log(
			'Warn',
			'"rsyncBinary" is outdated. Please use the new rsync = { ... } syntax."'
		)

		config.rsync.binary = config.rsyncBinary
		config.rsyncOpts = nil
	end

	-- checks if the _computed argument exists already
	if config.rsync._computed
	then
		error(
			'please do not use the internal rsync._computed parameter',
			level
		)
	end

	-- computes the rsync arguments into one list
	local crsync = config.rsync;

	-- everything implied by archive = true
	local archiveFlags = {
		recursive   =  true,
		links       =  true,
		perms       =  true,
		times       =  true,
		group       =  true,
		owner       =  true,
		devices     =  true,
		specials    =  true,
		hard_links  =  false,
		acls        =  false,
		xattrs      =  false,
	}

	-- if archive is given the implications are filled in
	if crsync.archive
	then
		for k, v in pairs( archiveFlags )
		do
			if crsync[ k ] == nil
			then
				crsync[ k ] = v
			end
		end
	end

	crsync._computed = { true }

	local computed = crsync._computed

	local computedN = 2

	local shortFlags = {
		acls               = 'A',
		checksum           = 'c',
		compress           = 'z',
		copy_links         = 'L',
		cvs_exclude        = 'C',
		dry_run            = 'n',
		executability      = 'E',
		group              = 'g',
		hard_links         = 'H',
		ignore_times       = 'I',
		ipv4               = '4',
		ipv6               = '6',
		keep_dirlinks      = 'K',
		links              = 'l',
		one_file_system    = 'x',
		owner              = 'o',
		perms              = 'p',
		protect_args       = 's',
		prune_empty_dirs   = 'm',
		quiet              = 'q',
		sparse             = 'S',
		times              = 't',
		update             = 'u',
		verbose            = 'v',
		whole_file         = 'W',
		xattrs             = 'X',
	}

	local shorts = { '-' }
	local shortsN = 2

	if crsync._extra
	then
		for k, v in ipairs( crsync._extra )
		do
			computed[ computedN ] = v
			computedN = computedN  + 1
		end
	end

	for k, flag in pairs( shortFlags )
	do
		if crsync[ k ]
		then
			shorts[ shortsN ] = flag
			shortsN = shortsN + 1
		end
	end

	if crsync.devices and crsync.specials
	then
			shorts[ shortsN ] = 'D'
			shortsN = shortsN + 1
	else
		if crsync.devices
		then
			computed[ computedN ] = '--devices'
			computedN = computedN  + 1
		end

		if crsync.specials
		then
			computed[ computedN ] = '--specials'
			computedN = computedN  + 1
		end
	end

	if crsync.bwlimit
	then
		computed[ computedN ] = '--bwlimit=' .. crsync.bwlimit
		computedN = computedN  + 1
	end

	if crsync.inplace
	then
		computed[ computedN ] = '--inplace'
		computedN = computedN  + 1
	end

	if crsync.password_file
	then
		computed[ computedN ] = '--password-file=' .. crsync.password_file
		computedN = computedN  + 1
	end

	if crsync.rsh
	then
		computed[ computedN ] = '--rsh=' .. crsync.rsh
		computedN = computedN  + 1
	end

	if crsync.rsync_path
	then
		computed[ computedN ] = '--rsync-path=' .. crsync.rsync_path
		computedN = computedN  + 1
	end

	if crsync.temp_dir
	then
		computed[ computedN ] = '--temp-dir=' .. crsync.temp_dir
		computedN = computedN  + 1
	end

	if crsync.timeout
	then
		computed[ computedN ] = '--timeout=' .. crsync.timeout
		computedN = computedN  + 1
	end

	if shortsN ~= 2
	then
		computed[ 1 ] = table.concat( shorts, '' )
	else
		computed[ 1 ] = { }
	end

	-- appends a / to target if not present
	if not skipTarget
	and string.sub( config.target, -1 ) ~= '/'
	then
		config.target = config.target..'/'
	end
end

---
--- Collect events and run postcmd after successful rsync
---
rsync.collect = function(agent, exitcode)
  log('Normal', 'Collecting event, exitcode: ', exitcode)
  local rc = default.collect(agent, exitcode)
  if rc ~= 'again'
  then
    prepost(agent.config, 'postcmd')
  end
  return rc
end

--
-- By default do deletes.
--
rsync.delete = true

--
-- Rsyncd exitcodes
--
rsync.exitcodes  = default.rsyncExitCodes

--
-- Calls rsync with this default options
--
rsync.rsync =
{
	-- The rsync binary to be called.
	binary        = '/usr/bin/rsync',
	links         = true,
	times         = true,
	protect_args  = true
}


--
-- Default delay
--
rsync.delay = 15

settings {
    logfile = "/var/log/lsyncd/lsyncd.log",
    statusFile = "/var/log/lsyncd/lsyncd-status.log",
    statusInterval = 20
}

{% for node in groups['repo_all'] %}
{% if groups['repo_all'][0] != node %}
sync {
    rsync,
    source = "{{ repo_service_home_folder }}/repo",
    target = "{{ hostvars[node]['ansible_host'] }}:{{ repo_service_home_folder }}/repo",
    exclude = {"{{ repo_build_global_links_dirname }}","/repo_sync_complete"},
    rsync = {
        compress = true,
        acls = true,
        rsh = "/usr/bin/ssh -l {{ repo_service_user_name }} -i {{ repo_service_home_folder }}/.ssh/id_rsa -o StrictHostKeyChecking=no -o ServerAliveInterval=30 -o ServerAliveCountMax=5",
        precmd = "sudo {{ repo_service_home_folder }}/repo/repo_prepost_cmd.sh pre-www",
        postcmd = "sudo {{ repo_service_home_folder }}/repo/repo_prepost_cmd.sh post-www"
    }
}
{% endif %}
{% endfor %}