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ftpsite_agent.rb 7.8KB

    require 'uri' require 'time' module Agents class FtpsiteAgent < Agent include FileHandling default_schedule "every_12h" gem_dependency_check { defined?(Net::FTP) && defined?(Net::FTP::List) } emits_file_pointer! description do <<-MD The Ftp Site Agent checks an FTP site and creates Events based on newly uploaded files in a directory. When receiving events it creates files on the configured FTP server. #{'## Include `net-ftp-list` in your Gemfile to use this Agent!' if dependencies_missing?} `mode` must be present and either `read` or `write`, in `read` mode the agent checks the FTP site for changed files, with `write` it writes received events to a file on the server. ### Universal options Specify a `url` that represents a directory of an FTP site to watch, and a list of `patterns` to match against file names. Login credentials can be included in `url` if authentication is required: `ftp://username:password@ftp.example.com/path`. Liquid formatting is supported as well: `ftp://{% credential ftp_credentials %}@ftp.example.com/` Optionally specify the encoding of the files you want to read/write in `force_encoding`, by default UTF-8 is used. ### Reading Only files with a last modification time later than the `after` value, if specifed, are emitted as event. ### Writing Specify the filename to use in `filename`, Liquid interpolation is possible to change the name per event. Use [Liquid](https://github.com/cantino/huginn/wiki/Formatting-Events-using-Liquid) templating in `data` to specify which part of the received event should be written. #{emitting_file_handling_agent_description} MD end event_description <<-MD Events look like this: { "url": "ftp://example.org/pub/releases/foo-1.2.tar.gz", "filename": "foo-1.2.tar.gz", "timestamp": "2014-04-10T22:50:00Z" } MD def working? if interpolated['mode'] == 'read' event_created_within?(interpolated['expected_update_period_in_days']) && !recent_error_logs? else received_event_without_error? end end def default_options { 'mode' => 'read', 'expected_update_period_in_days' => "1", 'url' => "ftp://example.org/pub/releases/", 'patterns' => [ 'foo-*.tar.gz', ], 'after' => Time.now.iso8601, 'force_encoding' => '', 'filename' => '', 'data' => '{{ data }}' } end def validate_options # Check for required fields begin if !options['url'].include?('{{') url = interpolated['url'] String === url or raise uri = URI(url) URI::FTP === uri or raise errors.add(:base, "url must end with a slash") if uri.path.present? && !uri.path.end_with?('/') end rescue errors.add(:base, "url must be a valid FTP URL") end options['mode'] = 'read' if options['mode'].blank? && new_record? if options['mode'].blank? || !['read', 'write'].include?(options['mode']) errors.add(:base, "The 'mode' option is required and must be set to 'read' or 'write'") end case interpolated['mode'] when 'read' patterns = options['patterns'] case patterns when Array if patterns.empty? errors.add(:base, "patterns must not be empty") end when nil, '' errors.add(:base, "patterns must be specified") else errors.add(:base, "patterns must be an array") end when 'write' if options['filename'].blank? errors.add(:base, "filename must be specified in 'write' mode") end if options['data'].blank? errors.add(:base, "data must be specified in 'write' mode") end end # Check for optional fields if (timestamp = options['timestamp']).present? begin Time.parse(timestamp) rescue errors.add(:base, "timestamp cannot be parsed as time") end end if options['expected_update_period_in_days'].present? errors.add(:base, "Invalid expected_update_period_in_days format") unless is_positive_integer?(options['expected_update_period_in_days']) end end def check return if interpolated['mode'] != 'read' saving_entries do |found| each_entry { |filename, mtime| found[filename, mtime] } end end def receive(incoming_events) return if interpolated['mode'] != 'write' incoming_events.each do |event| mo = interpolated(event) mo['data'].encode!(interpolated['force_encoding'], invalid: :replace, undef: :replace) if interpolated['force_encoding'].present? open_ftp(base_uri) do |ftp| ftp.storbinary("STOR #{mo['filename']}", StringIO.new(mo['data']), Net::FTP::DEFAULT_BLOCKSIZE) end end end def each_entry patterns = interpolated['patterns'] after = if str = interpolated['after'] Time.parse(str) else Time.at(0) end open_ftp(base_uri) do |ftp| log "Listing the directory" # Do not use a block style call because we need to call other # commands during iteration. list = ftp.list('-a') list.each do |line| entry = Net::FTP::List.parse line filename = entry.basename mtime = Time.parse(entry.mtime.to_s).utc patterns.any? { |pattern| File.fnmatch?(pattern, filename) } or next after < mtime or next yield filename, mtime end end end def open_ftp(uri) ftp = Net::FTP.new log "Connecting to #{uri.host}#{':%d' % uri.port if uri.port != uri.default_port}" ftp.connect(uri.host, uri.port) user = if str = uri.user URI.decode(str) else 'anonymous' end password = if str = uri.password URI.decode(str) else 'anonymous@' end log "Logging in as #{user}" ftp.login(user, password) ftp.passive = true if (path = uri.path.chomp('/')).present? log "Changing directory to #{path}" ftp.chdir(path) end yield ftp ensure log "Closing the connection" ftp.close end def base_uri @base_uri ||= URI(interpolated['url']) end def saving_entries known_entries = memory['known_entries'] || {} found_entries = {} new_files = [] yield proc { |filename, mtime| found_entries[filename] = misotime = mtime.utc.iso8601 unless (prev = known_entries[filename]) && misotime <= prev new_files << filename end } new_files.sort_by { |filename| found_entries[filename] }.each { |filename| create_event payload: get_file_pointer(filename).merge({ 'url' => (base_uri + uri_path_escape(filename)).to_s, 'filename' => filename, 'timestamp' => found_entries[filename], }) } memory['known_entries'] = found_entries save! end def get_io(file) data = StringIO.new open_ftp(base_uri) do |ftp| ftp.getbinaryfile(file, nil) do |chunk| data.write chunk.force_encoding(options['force_encoding'].presence || 'UTF-8') end end data.rewind data end private def is_positive_integer?(value) Integer(value) >= 0 rescue false end def uri_path_escape(string) str = string.b str.gsub!(/([^A-Za-z0-9\-._~!$&()*+,=@]+)/) { |m| '%' + m.unpack('H2' * m.bytesize).join('%').upcase } str.force_encoding(Encoding::US_ASCII) end end end