server code

One-line web server in Ruby


# From: http://www.ntecs.de/blog/articles/2008/02/09/the-worlds-smallest-webserver
# Author: Michael Neumann
# ... point your browser to http://localhost:3125/etc/motd

ruby -rsocket -e 's=TCPServer.new(5**5);loop{_=s.accept;_<<"HTTP/1.0 200 OK\r\n\r\n#{File.read(_.gets.split[1])rescue nil}";_.close}'

to ruby unix bash shell web server socket TCPServer by ntk on Apr 23, 2008

Run TCPServer as a simple Web server

A TCPServer accepts incoming TCP connections. Here is a Web server that listens on a given port and returns the time.

require 'socket'
port = (ARGV[0] || 80).to_i
server = TCPServer.new('localhost', port)
while (session = server.accept)
  puts "Request: #{session.gets}"
  session.print "HTTP/1.1 200/OK\r\nContent-type: text/html\r\n\r\n"
  session.print "<html><body><h1>#{Time.now}</h1></body></html>\r\n"
  session.close
end

This code was copied from Programming Ruby: The Pragmatic Programmer's Guide [rubycentral.com] while looking for information on Ruby CGI global variables.

to ruby web server socket simple session port TCPServer localhost by jrobertson on Apr 10, 2008

Introduction to Distributed Ruby

This code demonstrates a client server architecture. I executed the file simple_service.rb on my Ubuntu server (Donatello - 192.168.1.10), then from the CLI output I copied the server uri into the clipboard. I then executed the simple_client.rb on my Ubuntu desktop (Cryton - 192.168.1.3) while passing in the uri as an argument.

#!/usr/bin/env ruby -w
# simple_service.rb
# A simple DRb service

# load DRb
require 'drb'

# start up the DRb service
DRb.start_service nil, []

# We need the uri of the service to connect a client
puts DRb.uri

# wait for the DRb service to finish before exiting
DRb.thread.join

output: druby://donatello.mydomain.com:47159

#!/usr/bin/env ruby -w
# simple_client.rb
# A simple DRb client

require 'drb'

DRb.start_service

# attach to the DRb server via a URI given on the command line
remote_array = DRbObject.new nil, ARGV.shift

puts remote_array.size

remote_array << 1

puts remote_array.size

from the command line
> ./simple_client.rb druby://192.168.1.10:47159

output:
0
1

Note: I substituted the domain name with the ip address because the name in question was not stored within the DNS settings.

Reference: Introduction to Distributed Ruby (DRb) [segment7.net]

to ruby server client port listener sockets distributed by jrobertson on Mar 14, 2008

Runt.rb

// A tiny Ruby web server.

#!/usr/bin/env ruby

require "webrick"

s=WEBrick::HTTPServer.new(
        :BindAddress => "localhost",
        :Port => 8080,
        :DocumentRoot => File.dirname($0)+"/"+"www/"
)

trap("INT") { s.shutdown }

s.start

to ruby web webrick server by mcandre on Jan 19, 2008

Is site down script

// Tests if site is down/server is offline by trying to connect in specified time

import socket
import urllib2

def timeout(site, timeout):
  save = socket.getdefaulttimeout() 
  try:
    response = urllib2.urlopen(site)
    socket.setdefaulttimeout(save)
  except urllib2.URLError, err:
    socket.setdefaulttimeout(save)
    if err.__class__.__name__ == "URLError":
      if isinstance(err[0], socket.timeout):
        return True
  return False


if timeout("http://www.dummy-site.com/test_timeout.html", 10):
  print "Timeout detected"

to python server timeout site monitoring by techtonik on Jan 17, 2008

SCGI connector (Java)

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.HashMap;

/**
 * SCGI connector.<br>
 * Version: 1.0<br>
 * Home page: http://snippets.dzone.com/posts/show/4304
 */
public class SCGI {
  public static class SCGIException extends IOException {
    private static final long serialVersionUID = 1L;

    public SCGIException(String message) {
      super(message);
    }
  }

  /** Used to decode the headers. */
  public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");

  /**
   * Read the <a href="http://python.ca/scgi/protocol.txt">SCGI</a> request headers.<br>
   * After the headers had been loaded,
   * you can read the body of the request manually from the same {@code input} stream:<pre>
   *   // Load the SCGI headers.
   *   Socket clientSocket = socket.accept();
   *   BufferedInputStream bis = new BufferedInputStream(clientSocket.getInputStream(), 4096);
   *   HashMap<String, String> env = SCGI.parse(bis);
   *   // Read the body of the request.
   *   bis.read(new byte[Integer.parseInt(env.get("CONTENT_LENGTH"))]);
   * </pre>
   * @param input an efficient (buffered) input stream.
   * @return strings passed via the SCGI request.
   */
  public static HashMap parse(InputStream input) throws IOException {
    StringBuilder lengthString = new StringBuilder(12);
    String headers = "";
    for (;;) {
      char ch = (char) input.read();
      if (ch >= '0' && ch <= '9') {
        lengthString.append(ch);
      } else if (ch == ':') {
        int length = Integer.parseInt(lengthString.toString());
        byte[] headersBuf = new byte[length];
        int read = input.read(headersBuf);
        if (read != headersBuf.length)
          throw new SCGIException("Couldn't read all the headers (" + length + ").");
        headers = ISO_8859_1.decode(ByteBuffer.wrap(headersBuf)).toString();
        if (input.read() != ',') throw new SCGIException("Wrong SCGI header length: " + lengthString);
        break;
      } else {
        lengthString.append(ch);
        throw new SCGIException("Wrong SCGI header length: " + lengthString);
      }
    }
    HashMap env = new HashMap();
    while (headers.length() != 0) {
      int sep1 = headers.indexOf(0);
      int sep2 = headers.indexOf(0, sep1 + 1);
      env.put(headers.substring(0, sep1), headers.substring(sep1 + 1, sep2));
      headers = headers.substring(sep2 + 1);
    }
    return env;
  }
}

to java io web server SCGI by ArtemGr on Jul 16, 2007

'ant' build file for HelloWorldServlet and JettyLauncher

A pretty straightforward 'ant' build file. You will need to edit the jetty.home property to indicate where you installed Jetty.

<?xml version="1.0" encoding="UTF-8"?>
<project basedir="." default="compile" name="hello-servlet">
  <property name="build.dir"	location="classes" />
  <property name="src.dir"	location="src/main/java" />
  <property name="jetty.home"	location="/home/mrw/projects/jetty-6.1.3" />
  <property name="jetty.lib"	location="${jetty.home}/lib" />

  <path id="jetty.lib.path">
    <pathelement path="${jetty.lib}/jetty-6.1.3.jar" />
    <pathelement path="${jetty.lib}/jetty-util-6.1.3.jar" />
    <pathelement path="${jetty.lib}/servlet-api-2.5-6.1.3.jar" />
  </path>

  <target name="compile" description="Compile the project">
    <mkdir dir="${build.dir}" />
    <javac debug="true" destdir="${build.dir}" srcdir="${src.dir}"
	classpathref="jetty.lib.path">
      <compilerarg value="-Xlint:unchecked" />
      <compilerarg value="-Xlint:deprecation" />
    </javac>
  </target>

  <target name="all"  depends="clean,compile"
      description="Recompile from scratch"/>

  <target name="server" depends="compile" description="Launch the server">
    <java classname="com.babblemind.JettyLauncher" fork="true"
	classpathref="jetty.lib.path">
      <classpath>
	<pathelement path="${build.dir}" />
      </classpath>
    </java>
  </target>

  <target name="clean" description="Delete all files created by compile">
    <delete dir="${build.dir}" />
    <delete dir="docs/api" />
  </target>
</project>

to java server http build ant servlet jetty by mikewilsonuk on Jun 02, 2007

Minimal Java servlet

There is nothing particularly original here -- there are variations of this all over the place. This works nicely with my JettyLauncher class (see my other posts on DZone Snippets).


package com.babblemind;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class HelloWorldServlet extends HttpServlet{
    protected void doGet(HttpServletRequest httpServletRequest,
	HttpServletResponse httpServletResponse)
	    throws ServletException, IOException {

        httpServletResponse.setContentType("text/plain");
        PrintWriter out = httpServletResponse.getWriter();
        out.println("Hello World!");
        out.close();
    }
}

to java server servlet by mikewilsonuk on Jun 02, 2007

Minimal Jetty http server with Java servlet

This will start a Jetty http server with a single Java servlet at the root. See http://www.mortbay.org/ for Jetty downloads. This needs HelloWorldServlet from one of my other posts. Make life easier by downloading my ant build.xml as well.


package com.babblemind;

import org.mortbay.jetty.Server;
import org.mortbay.jetty.servlet.Context;
import org.mortbay.jetty.servlet.ServletHolder;

public class JettyLauncher {
    public static void main(String[] args) throws Exception {
	Server server = new Server(8080);    
	Context root = new Context(server, "/", Context.SESSIONS);
	root.addServlet(new ServletHolder(new HelloWorldServlet()), "/*");
	server.start();
    }
}

to java server http servlet jetty by mikewilsonuk on Jun 02, 2007

Configure MSSQL Linked Server to DB2 (via ODBC System DSN)

1. Install DB2 on MSSQL machine
2. Start Configuration Assistant. Add a new database mapping to the desired target DB2 database. Select option to create a System DSN along the way.
3. Start Microsoft’s ODBC Data Source Administrator. There should be a System DSN created from the previous step. Configure it with the userid/password for the target DB2 database.
4. Create linked server in MSSQL: EXEC sp_addlinkedserver @server = 'TMON', @srvproduct = '', @provider = 'MSDASQL', @datasrc = 'TMON'
5. Map access to linked server: EXEC sp_addlinkedsrvlogin 'TMON', 'false', NULL, 'db2admin', 'db2admin'
6. 2 ways to test the link: SELECT * FROM TMON..DB2ADMIN.USERS -- use uppercase for server, schema, table names SELECT * from OPENQUERY (TMON,'select * from users')

Notes:
* TMON is the remote DB2 database, also used as the DSN name.
* Remote DB2 server uses access id: db2admin and password: db2admin
* USERS is a table in the remote DB2 database

to sql server mssql DB2 dblink by wjchay on Mar 26, 2007

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