For winter break I decided to test some things that I've had in the back log for a while. These things are Google App Engine, Google Web Toolkit, ZSI.
I really like the new technologies that Google is implementing. I personally aren't a fan of javascript, and the way they have managed to hide a lot of it through the use of GWT is amazing, and can actually make you more productive.
Basically what GWT empowers you to do is build an UI pretty much like you would in AWT in Java, this is great for doing basic widgets, like those used in Web Dynpro in SAP. And you can modify their colors and characteristics with CSS aswell.
So you can mostly focus on your code and develop stuff faster.
I'm not a big fan of JSON and would like to avoid it. python-gwt-rpc looks promising.
Another tool I reviewed was Google App Engine. I can say it is amazing, I like it, just like it. Maybe I'm biased because I like python programming.I also went on to mess around a bit with ZSI, which is the python soap web service engine I suppose. Although documentation is scarce; got to add up pieces to get it to do what you need.I wanted to put a web server on python cgi, so I started writing a small wsdl:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:tns="http://mapleman.linuxreal.org" targetNamespace="http://mapleman.linuxreal.org"> 3 <wsdl:types> 4 <xs:schema targetNamespace="http://mapleman.linuxreal.org" elementFormDefault="qualified"/> 5 </wsdl:types> 6 <wsdl:message name="currentRequest"> 7 <wsdl:part name="voltage" type="xs:double"/> 8 <wsdl:part name="resistance" type="xs:double"/> 9 </wsdl:message> 10 <wsdl:message name="currentResponse"> 11 <wsdl:part name="current" type="xs:double"/> 12 </wsdl:message> 13 <wsdl:portType name="CurrentServer"> 14 <wsdl:operation name="Current"> 15 <wsdl:input message="tns:currentRequest"/> 16 <wsdl:output message="tns:currentResponse"/> 17 </wsdl:operation> 18 </wsdl:portType> 19 <wsdl:binding name="CurrentServer" type="tns:CurrentServer"> 20 <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/> 21 <wsdl:operation name="Current"> 22 <soap:operation soapAction="Current" style="rpc"/> 23 <wsdl:input> 24 <soap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://mapleman.linuxreal.org"/> 25 </wsdl:input> 26 <wsdl:output> 27 <soap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://mapleman.linuxreal.org"/> 28 </wsdl:output> 29 </wsdl:operation> 30 </wsdl:binding> 31 <wsdl:service name="CurrentServer"> 32 <wsdl:port name="CurrentPort" binding="tns:CurrentServer"> 33 <soap:address location="http://mapleman.linuxreal.org/cgi/ws/current/index.cgi"/> 34 </wsdl:port> 35 </wsdl:service> 36 </wsdl:definitions>
Then I applied wsdl2py from a python 2.5 installation script's dir on it. From it I grabbed the output python files
Uploaded it to the location along with ZSI in a directory
#!/usr/local/bin/python -d from CurrentServer_server import * from ZSI import * import sys serialized_result = "" try: ps = ParsedSoap(sys.stdin) curr = ps.Parse(currentRequest.typecode) sw = SoapWriter(sys.stdout) result = currentResponse() result._current = curr._voltage / curr._resistance sw.serialize(result,currentResponse.typecode) sw.close() serialized_result = str(sw) except ParseException, e: FaultFromZSIException(e).AsSOAP(OUT) except Exception, e: FaultFromException(e, 1).AsSOAP() if len(serialized_result) > 0: print 'Content-type: text/xml' print print serialized_result else: print 'Content-type: text/plain' print print 'This is a place holder for a webservice'
Surprisingly, that is all that is needed on the server side.
I also wrote a test client on python and on c# .net to make sure it worked correctly.
Code for C#
Added webreference using the wsdl then...
using zsitesting.linuxReal; // namespace of the webreference
private void Form1_Load(object sender, EventArgs e)
{
c = new CurrentServer(); // form loader
}
private void button1_Click(object sender, EventArgs e)
{
// this is just a button on a 3 textbox form
double d1 = Double.Parse(textBox1.Text);
double d2 = Double.Parse(textBox2.Text);
textBox3.Text = c.Current(d1,d2).ToString();
}
The python client requires to use wsdl2py and grab the client side files for current server.
from CurrentServer_client import * import sys loc = CurrentServerLocator() port = loc.getCurrentPort(tracefile=sys.stdout) msg = currentRequest() msg._resistance = 1.5 msg._voltage = 2.0 rsp = port.Current(msg) print "current: ", rsp._current
There are a few other items that I'm currently working on regarding exploration. Mainly messing with django and google app engine, the google datastore, etc.
Have been playing around with my pic16f84a and learning more about electronics, I guess that could be called a hobby of mine now a days.
posted at: 01:07 | path: /python
Adding python scripting capabilities to your code is an interesting thing to do, it can help you enhance an application without as much hard work. This is just an example on how to use code from memory as part of your program.
1 // Embedded Py.cpp 2 // 3 4 #include "stdafx.h" 5 #include <iostream> 6 #undef _DEBUG /* Link with python24.lib and not python24_d.lib */ 7 #include <Python.h> 8 9 10 using namespace std; 11 12 /* Python function code */ 13 char script[] = 14 "def doSomeStuff():\n" 15 " import sys\n" 16 " print sys\n" 17 " return 3+2+2"; 18 19 20 int _tmain(int argc, _TCHAR* argv[]) 21 { 22 PyObject *pName = NULL, *pModule = NULL, *pDict = NULL, *pFunc = NULL, *pCode = NULL, *pReturn = NULL; 23 Py_Initialize(); 24 25 /* Compile the script defined in the array script */ 26 pCode = Py_CompileString(script, "mini-script", Py_file_input); 27 28 if (!pCode || PyErr_Occurred()) 29 { 30 PyErr_Print(); 31 return 0; 32 } 33 34 /* Import the code compiled */ 35 pModule = PyImport_ExecCodeModule("mini-script", pCode); 36 37 if (!pModule || PyErr_Occurred()) 38 { 39 PyErr_Print(); 40 return 0; 41 } 42 43 /* Get the Dictionary of the module */ 44 pDict = PyModule_GetDict(pModule); 45 46 if (!pDict || PyErr_Occurred()) 47 { 48 PyErr_Print(); 49 return 0; 50 } 51 52 /* Grab the function with the name doSomeStuff() */ 53 pFunc = PyDict_GetItemString(pDict, "doSomeStuff"); 54 55 if (!pFunc || PyErr_Occurred()) 56 { 57 PyErr_Print(); 58 return 0; 59 } 60 61 /* Call the function */ 62 pReturn = PyObject_CallObject(pFunc, NULL); 63 64 if (!pReturn || PyErr_Occurred()) 65 { 66 PyErr_Print(); 67 return 0; 68 } 69 70 /* Make sure return value is of int type */ 71 if (PyInt_Check(pReturn)) 72 { 73 long returnOfFunc = PyInt_AsLong(pReturn); 74 cout << "The return of doSomeStuff() function is: " << returnOfFunc << endl; 75 } 76 77 /* Cleanup */ 78 Py_XDECREF(pReturn); 79 Py_XDECREF(pCode); 80 Py_XDECREF(pFunc); 81 Py_XDECREF(pDict); 82 Py_XDECREF(pModule); 83 Py_Finalize(); 84 85 return 0; 86 }
posted at: 17:50 | path: /python
Dumb strokes of C++ templates while bored.
1 #define QueueSize 5 2 3 template <typename T> 4 class Queue 5 { 6 7 public: 8 Queue() : head(NULL), tail(-1) { for (int i=0; i < QueueSize; queue[i++]=NULL); } 9 void insert(T in); 10 bool isEmpty() { return ( queue[head] == NULL ) ? true : false; } 11 bool isFull() { return (head == tail && queue[head] != NULL) ? true : false; } 12 T remove(); 13 void showContents(); 14 15 private: 16 T queue[QueueSize]; 17 int head, tail; 18 19 }; 20 21 template <typename T> 22 void Queue<T>::showContents() 23 { 24 25 int loc=0, i=0; 26 27 if(isEmpty()) 28 { 29 cout << "Empty" << endl; 30 return; 31 } 32 33 34 for (i=head; i < tail || i < QueueSize; i++) 35 cout << queue[i] << " "; 36 37 if(head > loc) 38 while(loc < tail && loc < head && queue[loc] != NULL) 39 cout << queue[loc++] << " "; 40 41 cout << endl; 42 43 44 } 45 46 47 template <typename T> 48 T Queue<T>::remove() 49 { 50 int retVal = 0; 51 52 if (!isEmpty()) 53 { 54 55 retVal = queue[head]; 56 queue[head] = NULL; 57 58 if (head == QueueSize - 1) 59 head = 0; 60 else 61 head++; 62 63 } 64 else 65 cout << "Stack Underflow" << endl; 66 67 return retVal; 68 69 } 70 71 template <typename T> 72 void Queue<T>::insert(T in) 73 { 74 int prevTail = tail; 75 76 if (tail == QueueSize - 1) 77 tail = 0; 78 else 79 tail++; 80 81 82 if (isFull()) 83 { 84 cout << "Stack Overflow" << endl; 85 tail = prevTail; 86 } 87 else 88 queue[tail] = in; 89 90 91 return; 92 }
posted at: 22:13 | path: /
Did a minor update on the book code since Amazon moved their webservices from ECS 3.0 to 4.0 and it broke all my code, now it is fixed.
posted at: 19:33 | path: /
Been very busy lately, going back to school to finally get my bachelors. Lately I have been playing with Amazon Web Services so I decided to add a list of my programming and personal books to the personal menu using the awesome AWS platform. I am only touching the tip of it obviously. Too much Web 2.0 hype lately, bring back the telnet days please =P
posted at: 23:17 | path: /
Working on RaidAlert which is a project that was customly ordered designed for my former boss. It is a systray Win32 application that connects to a web page using XML-RPC and checks for events issued by the web page administrator. And allows you to register or not to those events. Ironically this project is designed for a World of Warcraft clan. To the client what he wants right?
Been playing EVE Online a little bit. It is a great MMO that doesn't require as much attention as any other I have played and still allows you to advance. I use it as my Solitaire, just to relax between coding thoughts.
Following the elections in my country. I hope we beat Mr. Hugo Chavez's clone on the polls next July. Great blog about the current political situation in my country México en Peligro
I hope he gets squashed baaad in the polls otherwise I will have to run around like chicken little looking for an H1-B or an L1 *shivers*
Oh I finally updated the links on the projects in the page except mapleBlog which I can't find the original WAR file since the old site that hosted it shut down. *sobs*
posted at: 04:57 | path: /
uncommon.c
#include <stdio.h> int main( int argc , char ** argv , char ** env ) { if (argc != 3) { fprintf(stdout, "Usage: %s <palabraX> <palabraY>\n\r", argv[0]); return -1; } /* find out the size for the registry */ char * registry = NULL; registry = (char*)malloc( strlen(argv[1]) * sizeof(char) + 1); memset(registry, 0, sizeof(registry) + 1); char * wordX = argv[1], *wordY = argv[2], *startY = wordY; while ( *wordX ) { while( *wordY ) { if (*wordX == *wordY) break; wordY++; } if (!*wordY) { char *rr = registry; while(*rr) rr++; *rr = *wordX; } wordY = startY; wordX++; } fprintf(stdout, "output: %s\n\r", registry); free(registry); return 0; }
common.c
#include <stdio.h> int main( int argc , char ** argv , char ** env ) { if (argc != 3) { fprintf(stdout, "Usage: %s <palabraX> <palabraY>\n\r", argv[0]); return -1; } /* find out the size for the registry */ char * registry = NULL; registry = (char*)malloc( strlen(argv[1]) * sizeof(char) + 1); memset(registry, 0, sizeof(registry) + 1); char * wordX = argv[1], *wordY = argv[2], *startY = wordY; while ( *wordX ) { while (*wordY) { if (*wordX == *wordY) { char * rr = registry; while( *rr ) { if (*rr == *wordY) break; ++rr; } if (!*rr) { *rr = *wordY; break; } wordY++; } else wordY++; } wordX++; wordY = startY; } fprintf(stdout, "registry: %s\n\r", registry); free(registry); return 0; }
posted at: 04:57 | path: /
Lately I been messing with Medved QuoteTracker's API. It is an XML through TCP protocol. Medved only allows you to interact with its API from localhost. Unfortunately the PC that hosts the executable is not, well, mine. So I decided to rewrite my Java Proxy and make it extremely easy for anyone (the ones that use that particular PC) to run it without a hitch.
So obviously I had to write it with GUI. And well, it all went well, I think, and now its ready to battle the streaming protocols and beyond :)
Naturally the console based one is still included.
Ant Buildable source: mapleJProxy.jarposted at: 09:42 | path: /java
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posted at: 00:38 | path: /windows
The Buzzword of the year. It seems to be on everyone's mouth. Specially since GMail and other Google services started using it. So I jumped on the bandwagon, and wrote my menus using this technique. Totally unnecesary? Definitely. Entertaining? You bet. It turns the dullness of writing webpages into something interesting.
So how does it work? As you connect to the website, an XML Http Request is sent from your browser into a Python cgi. That Python CGI reads the variables and pulls the database table that match the parameters. It then proceeds to generate an XML that ultimately your browser (and the Javascript) parses and feeds to the DOM.
Source: toilet.js
posted at: 20:23 | path: /web