Class: XRefreshServer::Monitor

Inherits:
Object
  • Object
show all
Defined in:
lib/xrefresh-server/monitor.rb

Instance Method Summary collapse

Constructor Details

#initialize(server, config) ⇒ Monitor

Returns a new instance of Monitor.



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# File 'lib/xrefresh-server/monitor.rb', line 10

def initialize(server, config)
    @config = config
    @server = server
    @modified_dirs = Set.new
    @paths_info = Hash.new
    @streams = []
    @checksums = Hash.new
end

Instance Method Details

#checksum_modified?(full_path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/xrefresh-server/monitor.rb', line 56

def checksum_modified?(full_path)
    digest = Digest::MD5.hexdigest(File.read(full_path))
    return false if (@checksums[full_path]==digest)
    @checksums[full_path]=digest
    true
end

#run_loop(start_time) ⇒ Object

blocking call



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# File 'lib/xrefresh-server/monitor.rb', line 64

def run_loop(start_time)
    
    activities = {"changed" => blue('*'), "deleted" => red('-'), "created" => green('+'), "renamed" => magenta('>')}
    
    # main loop
    OUT.puts "Waiting for file system events ..."
    not_first_time = false
    loop do
        if @server.stopped?
            OUT.puts "Server stopped"
            break
        end
        @streams.each do |stream|
            FSEventStreamFlushSync(stream)
        end
        buckets = Hash.new()
        if not_first_time # all root folders are reported during first stream flush
            @modified_dirs.each do |dir_info|
                begin
                    dir = dir_info[:dir]
                    root = dir_info[:root]
                    unless dir=~@config["dir_include"]
                        OUT.puts "debug: #{dir} rejected because dir_include" if @config["debug"]
                        next
                    end
                    if dir=~@config["dir_exclude"]
                        OUT.puts "debug: #{dir} rejected because dir_exclude" if @config["debug"]
                        next
                    end

                    if File.exists?(dir)
                        OUT.puts "debug: checking dir #{dir}" if @config["debug"]
                        Dir.foreach(dir) do |file|
                            unless file=~@config["file_include"]
                                OUT.puts "debug: #{file} rejected because file_include" if @config["debug"]
                                next
                            end
                            if file=~@config["file_exclude"]
                                OUT.puts "debug: #{file} rejected because file_exclude" if @config["debug"]
                                next
                            end

                            full_path = File.join(dir, file)
                            next if File.directory?(full_path)
                            begin
                                stat = File.stat(full_path)
                                OUT.puts "debug: stat #{full_path}" if @config["debug"]
                            rescue
                                # file may not exist
                                OUT.puts "debug: stat failed #{full_path}" if @config["debug"]
                                next # keep silence
                            end
                            current_time = stat.mtime.to_i
                            original_time = @paths_info[full_path] || start_time

                            if (current_time > original_time)
                                OUT.puts "debug: reported #{full_path}" if @config["debug"]
                                relative_path = full_path[root.size+1..-1]
                                if (checksum_modified?(full_path))
                                    buckets[root]||=[]
                                    buckets[root]<< {
                                        "action" => "changed",
                                        "path1" => relative_path,
                                        "path2" => nil
                                    }
                                else
                                    OUT.puts "debug: not accepted - checksum is the same" if @config["debug"]
                                end
                            end
                            @paths_info[full_path] = current_time
                        end
                    else
                        relative_path = dir[root.size+1..-1]
                        buckets[root]||=[]
                        buckets[root]<< {
                            "action" => "deleted",
                            "path1" => relative_path,
                            "path2" => nil
                        }
                    end
                rescue
                    OUT.puts "debug: exception! #{dir}" if @config["debug"]
                    raise if @config["debug"]
                    next #keep silence
                end
            end
        else
            not_first_time = true
        end

        if buckets.size
            buckets.each do |root, files|
                OUT.puts "  activity in #{yellow(root)}:"
                files.each do |file|
                    OUT.puts "    #{activities[file["action"]]} #{blue(file["path1"])}"
                end
                date = nil
                time = nil
                name = root
                type = 'type?'

                @server.clients.each do |client|
                    client.send_do_refresh(root, name, type, date, time, files)
                end
            end
            buckets.clear
        end

        @modified_dirs.clear
        sleep @config["sleep_time"]
    end

    streams.each do |stream|
        FSEventStreamStop(stream)
        FSEventStreamInvalidate(stream)
        FSEventStreamRelease(stream)
    end
end

#schedule(start_event_id) ⇒ Object 



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# File 'lib/xrefresh-server/monitor.rb', line 19

def schedule(start_event_id)
    fsevents_cb = proc do |stream, ctx, numEvents, paths, marks, eventIDs|
        # ctx doesn't work through rubycocoa?
        root = FSEventStreamCopyPathsBeingWatched(stream).first
        paths.regard_as('*')
        numEvents.times do |n|
            OUT.puts "Event: #{paths[n]}" if @config["debug"]
            @modified_dirs.add({:root=>root, :dir=>paths[n]})
        end
    end

    @config["paths"].each do |path|
        OUT.puts "  monitoring #{yellow(path)}"
        # need to create new stream for every supplied path
        # because we want to report registered sources of the changes
        stream = FSEventStreamCreate(
            KCFAllocatorDefault,
            fsevents_cb,
            nil,
            [path],
            start_event_id,
            @config["defer_time"],
            KFSEventStreamCreateFlagNone) #KFSEventStreamCreateFlagNoDefer
        die "Failed to create the FSEventStream" unless stream

        FSEventStreamScheduleWithRunLoop(
            stream,
            CFRunLoopGetCurrent(),
            KCFRunLoopDefaultMode)

        ok = FSEventStreamStart(stream)
        die "Failed to start the FSEventStream" unless ok

        @streams << stream
    end
end