Renamed

--HG--
rename : bin/worker => bin/custodian-dequeue
rename : bin/parser.rb => bin/custodian-enqueue

1 files changed, 388 insertions, 0 deletions

diff --git a/bin/custodian-enqueue b/bin/custodian-enqueue
new file mode 100755
index 0000000..e0ce4ba
--- /dev/null
+++ b/bin/custodian-enqueue
@@ -0,0 +1,388 @@
+#!/usr/bin/ruby
+#
+# Notes
+#
+#  Macros may be defined either literally, or as a result of a HTTP-fetch.
+# Macro names match the pattern "^[0-9A-Z_]$"
+#
+#
+
+
+require 'beanstalk-client'
+require 'getoptlong'
+require 'json'
+
+
+
+
+
+
+
+
+#
+# This is a simple class which will parse a sentinel configuration file.
+#
+# Unlike Sentinel it is not using a real parser, instead it peels off lines
+# via a small number of very simple regular expressions - this should be flaky,
+# but in practice it manages to successfully parse each of the configuration
+# files that we currently maintain @ Bytemark.
+#
+# TODO:
+#
+# 1.  Explicitly abort and panic on malformed lines.
+#
+# 2.  Implement HTTP-fetching for macro-bodies.
+#
+#
+# Steve
+# --
+#
+class MonitorConfig
+
+  #
+  # A hash of macros we found.
+  #
+  attr_reader :MACROS
+
+  #
+  # A handle to the beanstalkd queue.
+  #
+  attr_reader :queue
+
+  #
+  # The filename that we're going to parse.
+  #
+  attr_reader :filename
+
+
+
+
+  #
+  # Constructor
+  #
+  def initialize( filename )
+    @MACROS = Hash.new()
+    @queue  = Beanstalk::Pool.new(['127.0.0.1:11300'])
+    @file   = filename
+
+    if ( @file.nil? || ( ! File.exists?( @file) ) )
+      raise ArgumentError, "Missing configuration file!"
+    end
+  end
+
+
+
+  #
+  #  Define a macro, from the configuration file.
+  #
+  def define_macro( line )
+    name = nil
+    val  = Array.new
+
+    #
+    #  Get the name
+    #
+    name = $1.dup if ( line =~ /^([A-Z_]+)\s+/ )
+
+
+    #
+    #  Get the value
+    #
+    if ( line =~ /fetched\s+from\s+(.*)[\r\n\.]*$/ )
+
+      #
+      #  HTTP-fetch
+      #
+      val.push( "steve")
+      val.push("kemp")
+
+    elsif ( line =~ /\s(is|are)\s+(.*)\.+$/ )
+
+      #
+      #  Literal list.
+      #
+      tmp = $2.dup.split( /\s+and\s+/ )
+      tmp.each do |entry|
+        val.push( entry )
+      end
+
+    end
+
+    @MACROS[name] = val
+  end
+
+
+
+
+  #
+  #  Return a hash of our current macro-definitions.
+  #
+  #  This is used only by the test-suite.
+  #
+  def macros
+    @MACROS
+  end
+
+
+
+
+  #
+  # Is the given string of text a macro?
+  #
+  def is_macro?( name )
+    !@MACROS[name].nil?
+  end
+
+
+
+  #
+  # Return an array of hosts if the given string was a macro identifier.
+  #
+  def get_macro_targets( name )
+    @MACROS[name]
+  end
+
+
+
+
+  #
+  # Parse a single line from the configuration file.
+  #
+  def parse_line( line )
+
+    #
+    # A blank line, or a comment may be skipped.
+    #
+    return if ( ( line =~ /^#/ ) || ( line.length < 1 ) )
+
+    #
+    # The specification of mauve-server to which we should raise our alerts to.
+    #
+    return if ( line =~ /Mauve\s+server(.*)source/ )
+
+
+    #
+    #  Look for macro definitions, inline
+    #
+    if ( line =~ /^([A-Z]_+)\s+are\s+fetched\s+from\s+([^\s]+)\.?/ )
+      define_macro( line )
+
+    elsif ( line =~ /^([0-9A-Z_]+)\s+(is|are)\s+/ )
+      define_macro( line )
+
+    elsif ( line =~ /\s+must\s+ping/ )
+
+      #
+      #  Target
+      #
+      targets = Array.new
+
+      #
+      #  Fallback target is the first token on the line
+      #
+      target = line.split( /\s+/)[0]
+
+
+      #
+      #  If the target is a macro
+      #
+      if ( is_macro?( target ) )
+        targets = get_macro_targets(target)
+      else
+        targets.push( target )
+      end
+
+      #
+      #  The alert-failure message
+      #
+      alert = "Ping failed"
+      if ( line =~ /otherwise '([^']+)'/ )
+        alert=$1.dup
+      end
+
+      #
+      #  Store the test(s)
+      #
+      targets.each do |host|
+        test = {
+          :target_host => host,
+          :test_type => "ping",
+          :test_alert => alert
+        }
+
+        if ( !ENV['DUMP'].nil? )
+          puts ( test.to_json )
+        else
+          @queue.put( test.to_json )
+        end
+      end
+
+    elsif ( line =~ /\s+must\s+run\s+([^\s]+)\s+/i )
+
+      #
+      # Get the service we're testing, and remove any trailing "."
+      #
+      # This handles the case of:
+      #
+      #  LINN_HOSTS must run ssh.
+      #
+      service = $1.dup
+      service.chomp!(".")
+
+      #
+      #  Target of the service-test.
+      #
+      targets = Array.new
+      target  = line.split( /\s+/)[0]
+
+      #
+      #  If the target is a macro
+      #
+      if ( is_macro?( target ) )
+        targets = get_macro_targets( target )
+      else
+        targets.push( target )
+      end
+
+      #
+      #  Alert text
+      #
+      alert = "#{service} failed"
+      if ( line =~ /otherwise '([^']+)'/ )
+        alert=$1.dup
+      end
+
+      #
+      # All our service tests require a port - we setup the defaults here,
+      # but the configuration file will allow users to specify an alternative
+      # via " on XXX ".
+      #
+      case service
+      when /ssh/ then
+        port=22
+      when /jabber/ then
+        port=5222
+      when /ldap/ then
+        port=389
+      when /^https$/ then
+        port=443
+      when /^http$/ then
+        port=80
+      when /rsync/i then
+        port=873
+      when /ftp/i then
+        port=21
+      when /telnet/i then
+        port=23
+      when /smtp/i then
+        port=25
+      end
+
+      #
+      # But allow that to be changed
+      #
+      # e.g.
+      #
+      #  must run ssh on 33 otherwise ..
+      #  must run ftp on 44 otherwise ..
+      #  must run http on 8000 otherwise ..
+      #
+      if ( line =~ /\s+on\s+([0-9]+)/ )
+        port = $1.dup
+      end
+
+      targets.each do |host|
+
+        test = {
+          :target_host => host,
+          :test_type   => service,
+          :test_port   => port,
+          :test_alert  => alert
+        }
+
+        #
+        # HTTP-tests will include the expected result in one of two
+        # forms:
+        #
+        #    must run http with status 200
+        #
+        #    must run http with content 'text'
+        #
+        # If those are sepcified then include them here.
+        #
+        # Note we're deliberately fast and loose here - which allows both to be specified
+        #
+        #   http://example.vm/ must run http with status 200 and content 'OK' otherwise 'boo!'.
+        #
+        #
+        if ( line =~ /\s+with\s+status\s+([0-9]+)\s+/ )
+          test[:http_status]=$1.dup
+        end
+        if ( line =~ /\s+with\s+content\s+'([^']+)'/ )
+          test[:http_text]=$1.dup
+        end
+
+        #
+        # We've parsed(!) the line.  Either output the JSON to the console
+        # or add to the queue.
+        #
+        if ( !ENV['DUMP'].nil? )
+          puts ( test.to_json )
+        else
+          @queue.put( test.to_json )
+        end
+      end
+    else
+      puts "Unknown line: #{line}" if ( line.length > 2 )
+    end
+  end
+
+
+
+
+  #
+  # Parse the configuration file which was named in our constructor.
+  #
+  def parse_file()
+    #
+    #  Parse the configuration file on the command line
+    #
+    File.open( @file, "r").each_line do |line|
+      parse_line( line)
+    end
+  end
+
+
+end
+
+
+
+
+
+#
+#  Entry-point to our code.
+#
+if __FILE__ == $0 then
+
+
+  begin
+    opts = GetoptLong.new(
+                          [ "--dump", "-d", GetoptLong::NO_ARGUMENT ],
+                          [ "--file", "-f", GetoptLong::REQUIRED_ARGUMENT ]
+                          )
+    opts.each do |opt, arg|
+      case opt
+      when "--dump":
+          ENV["DUMP"] = "1"
+      when "--file":
+          ENV["FILE"] = arg
+      end
+    end
+  rescue StandardError => ex
+    puts "Option parsing failed: #{ex.to_s}"
+    exit
+  end
+
+  mon = MonitorConfig.new( ENV['FILE'] )
+  mon.parse_file();
+end