Class: GRI::RemoteLDB

Inherits:
Object show all
Defined in:
lib/gri/ldb.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tra_uri, host) ⇒ RemoteLDB

Returns a new instance of RemoteLDB.



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# File 'lib/gri/ldb.rb', line 96

def initialize tra_uri, host
  @tra_uri = tra_uri
  @host = host
  @sock = nil
end

Class Method Details

.get_gritab_lines(tra_uri) ⇒ Object 



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# File 'lib/gri/ldb.rb', line 65

def self.get_gritab_lines tra_uri
  lines = nil
  tra_uri.path = '/gritab'
  get_lines tra_uri
end

.get_lines(uri) ⇒ Object 



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# File 'lib/gri/ldb.rb', line 71

def self.get_lines uri
  case uri.scheme
  when 'http'
    res = Net::HTTP.get uri
    lines = res.split /\n/
  when 'tra'
    sock = TCPSocket.new(uri.host, uri.port || 7079)
    sock.puts "#{uri.path} #{uri.query}"
    lines = tra_gets sock
    sock.close
  end
  lines
end

.tra_gets(sock) ⇒ Object 



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# File 'lib/gri/ldb.rb', line 85

def self.tra_gets sock
  lines = []
  while line = sock.gets
    line.chomp!
    break if line == '.'
    line.sub!(/\A\./, '')
	lines.push line
  end
  lines
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/gri/ldb.rb', line 146

def close
  @sock.close rescue nil
end

#get_after(data_name, time, pos = 0) ⇒ Object 



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# File 'lib/gri/ldb.rb', line 102

def get_after data_name, time, pos=0
  open_after(data_name, time, pos) {|t, line, pos|
    h = LTSV.parse_string line
    t ||= Time.at(h['_time'].to_i)
    yield t, h, pos
  }
end

#get_data_names ⇒ Object 



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# File 'lib/gri/ldb.rb', line 150

def get_data_names
  @tra_uri.path = '/get_data_names'
  @tra_uri.query = "h=#{@host}"
  lines = self.class.get_lines @tra_uri
  lines.inject({}) {|h, line|
    data_name, interval = line.split /_/
    h[data_name || ''] = (interval || 300).to_i
    h
  }
end

#open_after(data_name, time, pos = 0) ⇒ Object 



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# File 'lib/gri/ldb.rb', line 110

def open_after data_name, time, pos=0
  case @tra_uri.scheme
  when 'http'
    http = Net::HTTP.new @tra_uri.host, @tra_uri.port
    begin
      url = @tra_uri + "get?h=#{@host}&s=#{data_name}&t=#{time.to_i}"
      res = http.get url.request_uri
      res.body.each_line {|line| yield nil, line.chomp, pos}
    end while(time = res['x-gri-continue'])
    http.finish
  when 'tra'
    sock = sock_connect @tra_uri.host, @tra_uri.port
    begin
      query = "h=#{@host}&s=#{data_name}&t=#{time.to_i}&pos=#{pos}"
      sock.puts "/get #{query}"
      lines = self.class.tra_gets sock
      ind = lines.index ''
      headers = lines.slice!(0, ind+1)
      if headers.detect {|line| line =~ /x-gri-pos: (\d+)/i}
        pos = $1.to_i
      end
      lines.each {|line| yield nil, line, pos}
      if headers.detect {|line| line =~ /x-gri-continue: (\d+) (\d+)/i}
        time = $1.to_i
        pos = $2.to_i
      else
        time = nil
      end
    end while time
  end
end

#sock_connect(host, port) ⇒ Object 



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# File 'lib/gri/ldb.rb', line 142

def sock_connect host, port
  @sock ||= TCPSocket.new host, port
end