Patch #536883: SimpleXMLRPCServer auto-docing subclass.

5 files changed, 418 insertions, 0 deletions

diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index 5faeedc..3843d46 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -231,6 +231,7 @@ and how to embed it in other applications.
 \input{libcookie}
 \input{libxmlrpclib}
 \input{libsimplexmlrpc}
+\input{libdocxmlrpc}
 \input{libasyncore}
 \input{libasynchat}
 
diff --git a/Doc/lib/libdocxmlrpc.tex b/Doc/lib/libdocxmlrpc.tex
new file mode 100644
index 0000000..fc69031
--- /dev/null
+++ b/Doc/lib/libdocxmlrpc.tex
@@ -0,0 +1,105 @@
+\section{\module{DocXMLRPCServer} ---
+         Self-documenting XML-RPC server}
+
+\declaremodule{standard}{DocXMLRPCServer}
+\modulesynopsis{Self-documenting XML-RPC server implementation.}
+\moduleauthor{Brian Quinlan}{brianq@activestate.com}
+\sectionauthor{Brian Quinlan}{brianq@activestate.com}
+
+\versionadded{2.3}
+
+The \module{DocXMLRPCServer} module extends the classes found in
+\module{SimpleXMLRPCServer} to serve HTML documentation in response to
+HTTP GET requests. Servers can either be free standing, using
+\class{DocXMLRPCServer}, or embedded in a CGI environment, using
+\class{DocCGIXMLRPCRequestHandler}.
+
+\begin{classdesc}{DocXMLRPCServer}{addr\optional{, 
+                                   requestHandler\optional{, logRequests}}}
+
+Create a new server instance. All parameters have the same meaning as
+for \class{SimpleXMLRPCServer.SimpleXMLRPCServer};
+\var{requestHandler} defaults to \class{DocXMLRPCRequestHandler}.
+
+\end{classdesc}
+
+\begin{classdesc}{DocCGIXMLRPCRequestHandler}{}
+
+Create a new instance to handle XML-RPC requests in a CGI environment.
+
+\end{classdesc}
+
+\begin{classdesc}{DocXMLRPCRequestHandler}{}
+
+Create a new request handler instance. This request handler supports
+XML-RPC POST requests, documentation GET requests, and modifies
+logging so that the \var{logRequests} parameter to the
+\class{DocXMLRPCServer} constructor parameter is honored.
+
+\end{classdesc}
+
+\subsection{DocXMLRPCServer Objects \label{doc-xmlrpc-servers}}
+
+The \class{DocXMLRPCServer} class is derived from
+\class{SimpleXMLRPCServer.SimpleXMLRPCServer} and provides a means of
+creating self-documenting, stand alone XML-RPC servers. HTTP POST
+requests are handled as XML-RPC method calls. HTTP GET requests are
+handled by generating pydoc-style HTML documentation. This allows a
+server to provide its own web-based documentation.
+
+\begin{methoddesc}{set_server_title}{server_title}
+
+Set the title used in the generated HTML documentation. This title
+will be used inside the HTML "title" element.
+
+\end{methoddesc}
+
+\begin{set_server_name}{server_name}
+
+Set the name used in the generated HTML documentation. This name will
+appear at the top of the generated documentation inside a "h1"
+element.
+
+\end{methoddesc}
+
+
+\begin{set_server_documentation}{server_documentation}
+
+Set the description used in the generated HTML documentation. This
+description will appear as a paragraph, below the server name, in the
+documentation.
+
+\end{methoddesc}
+
+\subsection{DocCGIXMLRPCRequestHandler}
+
+The \class{DocCGIXMLRPCRequestHandler} class is derived from
+\class{SimpleXMLRPCServer.CGIXMLRPCRequestHandler} and provides a means
+of creating self-documenting, XML-RPC CGI scripts. HTTP POST requests
+are handled as XML-RPC method calls. HTTP GET requests are handled by
+generating pydoc-style HTML documentation. This allows a server to
+provide its own web-based documentation.
+
+\begin{methoddesc}{set_server_title}{server_title}
+
+Set the title used in the generated HTML documentation. This title
+will be used inside the HTML "title" element.
+
+\end{methoddesc}
+
+\begin{methoddesc}{set_server_name}{server_name}
+
+Set the name used in the generated HTML documentation. This name will
+appear at the top of the generated documentation inside a "h1"
+element.
+
+\end{methoddesc}
+
+
+\begin{methoddesc}{set_server_documentation}{server_documentation}
+
+Set the description used in the generated HTML documentation. This
+description will appear as a paragraph, below the server name, in the
+documentation.
+
+\end{methoddesc}
diff --git a/Doc/whatsnew/whatsnew23.tex b/Doc/whatsnew/whatsnew23.tex
index 38669b2..f447ed4 100644
--- a/Doc/whatsnew/whatsnew23.tex
+++ b/Doc/whatsnew/whatsnew23.tex
@@ -1812,6 +1812,14 @@ of the URL is ASCII only.
 To implement this change, the module \module{stringprep}, the tool
 \code{mkstringprep} and the \code{punycode} encoding have been added.
 
+\item The new \module{DocXMLRPCServer} allows to write 
+self-documenting XML-RPC servers. Run it in demo mode (as a program)
+to see it in action: Pointing the Web browser to the RPC server
+produces pydoc-style documentation; pointing xmlrpclib to the
+server allows to invoke the actual methods.
+
+Contributed by Brian Quinlan.
+
 \end{itemize}
 
 
diff --git a/Lib/DocXMLRPCServer.py b/Lib/DocXMLRPCServer.py
new file mode 100644
index 0000000..adb8a93
--- /dev/null
+++ b/Lib/DocXMLRPCServer.py
@@ -0,0 +1,302 @@
+"""Self documenting XML-RPC Server.
+
+This module can be used to create XML-RPC servers that
+serve pydoc-style documentation in response to HTTP
+GET requests. This documentation is dynamically generated
+based on the functions and methods registered with the
+server.
+
+This module is built upon the pydoc and SimpleXMLRPCServer
+modules.
+"""
+
+import pydoc
+import inspect
+import types
+import re
+
+from SimpleXMLRPCServer import SimpleXMLRPCServer,\
+            SimpleXMLRPCRequestHandler,\
+            CGIXMLRPCRequestHandler,\
+            resolve_dotted_attribute
+
+class ServerHTMLDoc(pydoc.HTMLDoc):
+    """Class used to generate pydoc HTML document for a server"""
+    
+    def markup(self, text, escape=None, funcs={}, classes={}, methods={}):
+        """Mark up some plain text, given a context of symbols to look for.
+        Each context dictionary maps object names to anchor names."""
+        escape = escape or self.escape
+        results = []
+        here = 0
+
+        # XXX Note that this regular expressions does not allow for the
+        # hyperlinking of arbitrary strings being used as method
+        # names. Only methods with names consisting of word characters
+        # and '.'s are hyperlinked.
+        pattern = re.compile(r'\b((http|ftp)://\S+[\w/]|'
+                                r'RFC[- ]?(\d+)|'
+                                r'PEP[- ]?(\d+)|'
+                                r'(self\.)?((?:\w|\.)+))\b')
+        while 1:
+            match = pattern.search(text, here)
+            if not match: break
+            start, end = match.span()
+            results.append(escape(text[here:start]))
+
+            all, scheme, rfc, pep, selfdot, name = match.groups()
+            if scheme:
+                url = escape(all).replace('"', '"')
+                results.append('<a href="%s">%s</a>' % (url, url))
+            elif rfc:
+                url = 'http://www.rfc-editor.org/rfc/rfc%d.txt' % int(rfc)
+                results.append('<a href="%s">%s</a>' % (url, escape(all)))
+            elif pep:
+                url = 'http://www.python.org/peps/pep-%04d.html' % int(pep)
+                results.append('<a href="%s">%s</a>' % (url, escape(all)))
+            elif text[end:end+1] == '(':
+                results.append(self.namelink(name, methods, funcs, classes))
+            elif selfdot:
+                results.append('self.<strong>%s</strong>' % name)
+            else:
+                results.append(self.namelink(name, classes))
+            here = end
+        results.append(escape(text[here:]))
+        return ''.join(results)
+    
+    def docroutine(self, object, name=None, mod=None,
+                   funcs={}, classes={}, methods={}, cl=None):
+        """Produce HTML documentation for a function or method object."""
+
+        anchor = (cl and cl.__name__ or '') + '-' + name
+        note = ''
+
+        title = '<a name="%s"><strong>%s</strong></a>' % (anchor, name)
+            
+        if inspect.ismethod(object):
+            args, varargs, varkw, defaults = inspect.getargspec(object.im_func)
+            # exclude the argument bound to the instance, it will be
+            # confusing to the non-Python user
+            argspec = inspect.formatargspec (
+                    args[1:],
+                    varargs,
+                    varkw,
+                    defaults,
+                    formatvalue=self.formatvalue
+                )
+        elif inspect.isfunction(object):
+            args, varargs, varkw, defaults = inspect.getargspec(object)
+            argspec = inspect.formatargspec(
+                args, varargs, varkw, defaults, formatvalue=self.formatvalue)
+        else:
+            argspec = '(...)'
+
+        if isinstance(object, types.TupleType):
+            argspec = object[0] or argspec
+            docstring = object[1] or ""
+        else:
+            docstring = pydoc.getdoc(object)
+                
+        decl = title + argspec + (note and self.grey(
+               '<font face="helvetica, arial">%s</font>' % note))
+
+        doc = self.markup(
+            docstring, self.preformat, funcs, classes, methods)
+        doc = doc and '<dd><tt>%s</tt></dd>' % doc
+        return '<dl><dt>%s</dt>%s</dl>\n' % (decl, doc)
+
+    def docserver(self, server_name, package_documentation, methods):
+        """Produce HTML documentation for an XML-RPC server."""
+
+        fdict = {}
+        for key, value in methods.items():
+            fdict[key] = '#-' + key
+            fdict[value] = fdict[key]
+            
+        head = '<big><big><strong>%s</strong></big></big>' % server_name            
+        result = self.heading(head, '#ffffff', '#7799ee')
+       
+        doc = self.markup(package_documentation, self.preformat, fdict)
+        doc = doc and '<tt>%s</tt>' % doc
+        result = result + '<p>%s</p>\n' % doc
+
+        contents = []
+        method_items = methods.items()
+        method_items.sort()
+        for key, value in method_items:
+            contents.append(self.docroutine(value, key, funcs=fdict))
+        result = result + self.bigsection(
+            'Methods', '#ffffff', '#eeaa77', pydoc.join(contents))
+
+        return result
+
+class XMLRPCDocGenerator:
+    """Generates documentation for an XML-RPC server.
+
+    This class is designed as mix-in and should not
+    be constructed directly.
+    """
+    
+    def __init__(self):
+        # setup variables used for HTML documentation
+        self.server_name = 'XML-RPC Server Documentation'
+        self.server_documentation = \
+            "This server exports the following methods through the XML-RPC "\
+            "protocol."
+        self.server_title = 'XML-RPC Server Documentation'
+
+    def set_server_title(self, server_title):
+        """Set the HTML title of the generated server documentation"""
+
+        self.server_title = server_title
+
+    def set_server_name(self, server_name):
+        """Set the name of the generated HTML server documentation"""
+
+        self.server_name = server_name
+
+    def set_server_documentation(self, server_documentation):
+        """Set the documentation string for the entire server."""
+
+        self.server_documentation = server_documentation
+
+    def generate_html_documentation(self):
+        """generate_html_documentation() => html documentation for the server
+
+        Generates HTML documentation for the server using introspection for
+        installed functions and instances that do not implement the
+        _dispatch method. Alternatively, instances can choose to implement
+        the _get_method_argstring(method_name) method to provide the
+        argument string used in the documentation and the
+        _methodHelp(method_name) method to provide the help text used
+        in the documentation."""
+        
+        methods = {}
+
+        for method_name in self.system_listMethods():
+            if self.funcs.has_key(method_name):
+                method = self.funcs[method_name]
+            elif self.instance is not None:
+                method_info = [None, None] # argspec, documentation
+                if hasattr(self.instance, '_get_method_argstring'):
+                    method_info[0] = self.instance._get_method_argstring(method_name)
+                if hasattr(self.instance, '_methodHelp'):
+                    method_info[1] = self.instance._methodHelp(method_name)
+
+                method_info = tuple(method_info)
+                if method_info != (None, None):
+                    method = method_info
+                elif not hasattr(self.instance, '_dispatch'):
+                    try:
+                        method = resolve_dotted_attribute(
+                                    self.instance,
+                                    method_name
+                                    )
+                    except AttributeError:
+                        method = method_info
+                else:
+                    method = method_info
+            else:
+                assert 0, "Could not find method in self.functions and no "\
+                          "instance installed"
+
+            methods[method_name] = method
+
+        documenter = ServerHTMLDoc()
+        documentation = documenter.docserver(
+                                self.server_name,
+                                self.server_documentation,
+                                methods
+                            )
+                                        
+        return documenter.page(self.server_title, documentation)
+
+class DocXMLRPCRequestHandler(SimpleXMLRPCRequestHandler):
+    """XML-RPC and documentation request handler class.
+
+    Handles all HTTP POST requests and attempts to decode them as
+    XML-RPC requests.
+
+    Handles all HTTP GET requests and interprets them as requests
+    for documentation.
+    """
+
+    def do_GET(self):
+        """Handles the HTTP GET request.
+
+        Interpret all HTTP GET requests as requests for server
+        documentation.
+        """
+        
+        response = self.server.generate_html_documentation()
+        self.send_response(200)
+        self.send_header("Content-type", "text/html")
+        self.send_header("Content-length", str(len(response)))
+        self.end_headers()
+        self.wfile.write(response)
+
+        # shut down the connection
+        self.wfile.flush()
+        self.connection.shutdown(1)
+
+class DocXMLRPCServer(  SimpleXMLRPCServer,
+                        XMLRPCDocGenerator):
+    """XML-RPC and HTML documentation server.
+
+    Adds the ability to serve server documentation to the capabilities
+    of SimpleXMLRPCServer.
+    """
+
+    def __init__(self, addr, requestHandler=DocXMLRPCRequestHandler,
+                 logRequests=1):
+        SimpleXMLRPCServer.__init__(self, addr, requestHandler, logRequests)
+        XMLRPCDocGenerator.__init__(self)
+        
+class DocCGIXMLRPCRequestHandler(   CGIXMLRPCRequestHandler,
+                                    XMLRPCDocGenerator):
+    """Handler for XML-RPC data and documentation requests passed through
+    CGI"""
+
+    def handle_get(self):
+        """Handles the HTTP GET request.
+
+        Interpret all HTTP GET requests as requests for server
+        documentation.
+        """
+
+        response = self.generate_html_documentation()
+
+        print 'Content-Type: text/html'
+        print 'Content-Length: %d' % len(response)
+        print
+        print response
+
+    def __init__(self):
+        CGIXMLRPCRequestHandler.__init__(self)
+        XMLRPCDocGenerator.__init__(self)
+
+if __name__ == '__main__':
+    def deg_to_rad(deg):
+        """deg_to_rad(90) => 1.5707963267948966
+
+        Converts an angle in degrees to an angle in radians"""
+        import math
+        return deg * math.pi / 180        
+        
+    server = DocXMLRPCServer(("localhost", 8000))
+
+    server.set_server_title("Math Server")
+    server.set_server_name("Math XML-RPC Server")
+    server.set_server_documentation("""This server supports various mathematical functions.
+
+You can use it from Python as follows:
+
+>>> from xmlrpclib import ServerProxy
+>>> s = ServerProxy("http://localhost:8000")
+>>> s.deg_to_rad(90.0)
+1.5707963267948966""")
+
+    server.register_function(deg_to_rad)
+    server.register_introspection_functions()
+
+    server.serve_forever()        
\ No newline at end of file
diff --git a/Misc/NEWS b/Misc/NEWS
index 07a9bc6..cf3b5f7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -118,6 +118,8 @@ Extension modules
 Library
 -------
 
+- The self-documenting XML server library DocXMLRPCServer was added.
+
 - Support for internationalized domain names has been added through
   the 'idna' and 'punycode' encodings, the 'stringprep' module, the
   'mkstringprep' tool, and enhancements to the socket and httplib