root/trunk/cherrypy/test/test_caching.py

from cherrypy.test import test
test.prefer_parent_path()

import gzip
import os
curdir = os.path.join(os.getcwd(), os.path.dirname(__file__))
import StringIO

import cherrypy
from cherrypy.lib import http

gif_bytes = ('GIF89a\x01\x00\x01\x00\x82\x00\x01\x99"\x1e\x00\x00\x00\x00\x00'
             '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
             '\x00,\x00\x00\x00\x00\x01\x00\x01\x00\x02\x03\x02\x08\t\x00;')


def setup_server():
    
    class Root:
        
        _cp_config = {'tools.caching.on': True}
        
        def __init__(self):
            cherrypy.counter = 0
        
        def index(self):
            cherrypy.counter += 1
            msg = "visit #%s" % cherrypy.counter
            return msg
        index.exposed = True
        
        def a_gif(self):
            cherrypy.response.headers['Last-Modified'] = http.HTTPDate()
            return gif_bytes
        a_gif.exposed = True
    
    class UnCached(object):
        _cp_config = {'tools.expires.on': True,
                      'tools.staticdir.on': True,
                      'tools.staticdir.dir': 'static',
                      'tools.staticdir.root': curdir,
                      }

        def force(self):
            self._cp_config['tools.expires.force'] = True
            return "being forceful"
        force.exposed = True

        def dynamic(self):
            cherrypy.response.headers['Cache-Control'] = 'private'
            return "D-d-d-dynamic!"
        dynamic.exposed = True

        def cacheable(self):
            cherrypy.response.headers['Etag'] = 'bibbitybobbityboo'
            return "Hi, I'm cacheable."
        cacheable.exposed = True

        def specific(self):
            return "I am being specific"
        specific.exposed = True
        specific._cp_config = {'tools.expires.secs': 86400}

        class Foo(object):pass
        
        def wrongtype(self):
            return "Woops"
        wrongtype.exposed = True
        wrongtype._cp_config = {'tools.expires.secs': Foo()}
    
    cherrypy.tree.mount(Root())
    cherrypy.tree.mount(UnCached(), "/expires")
    cherrypy.config.update({'environment': 'test_suite',
                            'tools.gzip.on': True})


from cherrypy.test import helper

class CacheTest(helper.CPWebCase):

    def testCaching(self):
        elapsed = 0.0
        for trial in xrange(10):
            self.getPage("/")
            # The response should be the same every time,
            # except for the Age response header.
            self.assertBody('visit #1')
            if trial != 0:
                age = int(self.assertHeader("Age"))
                self.assert_(age >= elapsed)
                elapsed = age
        
        # POST, PUT, DELETE should not be cached.
        self.getPage("/", method="POST")
        self.assertBody('visit #2')
        # The previous request should have invalidated the cache,
        # so this request will recalc the response.
        self.getPage("/", method="GET")
        self.assertBody('visit #3')
        # ...but this request should get the cached copy.
        self.getPage("/", method="GET")
        self.assertBody('visit #3')
        self.getPage("/", method="DELETE")
        self.assertBody('visit #4')
        
        # The previous request should have invalidated the cache,
        # so this request will recalc the response.
        self.getPage("/", method="GET", headers=[('Accept-Encoding', 'gzip')])
        self.assertHeader('Content-Encoding', 'gzip')
        self.assertEqual(cherrypy.lib.encoding.decompress(self.body), "visit #5")
        
        # Now check that a second request gets the gzip header and gzipped body
        # This also tests a bug in 3.0 to 3.0.2 whereby the cached, gzipped
        # response body was being gzipped a second time.
        self.getPage("/", method="GET", headers=[('Accept-Encoding', 'gzip')])
        self.assertHeader('Content-Encoding', 'gzip')
        self.assertEqual(cherrypy.lib.encoding.decompress(self.body), "visit #5")
        
        # Now check that a third request that doesn't accept gzip
        # skips the cache (because the 'Vary' header denies it).
        self.getPage("/", method="GET")
        self.assertNoHeader('Content-Encoding')
        self.assertBody('visit #6')
    
    def testExpiresTool(self):
        
        # test setting an expires header
        self.getPage("/expires/specific")
        self.assertStatus("200 OK")
        self.assertHeader("Expires")
        
        # test exceptions for bad time values
        self.getPage("/expires/wrongtype")
        self.assertStatus(500)
        self.assertInBody("TypeError")
        
        # static content should not have "cache prevention" headers
        self.getPage("/expires/index.html")
        self.assertStatus("200 OK")
        self.assertNoHeader("Pragma")
        self.assertNoHeader("Cache-Control")
        
        # dynamic content that sets indicators should not have
        # "cache prevention" headers
        self.getPage("/expires/cacheable")
        self.assertStatus("200 OK")
        self.assertNoHeader("Pragma")
        self.assertNoHeader("Cache-Control")
        
        self.getPage('/expires/dynamic')
        self.assertBody("D-d-d-dynamic!")
        # the Cache-Control header should be untouched
        self.assertHeader("Cache-Control", "private")
        
        # configure the tool to ignore indicators and replace existing headers
        self.getPage("/expires/force")
        self.assertStatus("200 OK")
        # This also gives us a chance to test 0 expiry with no other headers
        self.assertHeader("Pragma", "no-cache")
        if cherrypy.server.protocol_version == "HTTP/1.1":
            self.assertHeader("Cache-Control", "no-cache, must-revalidate")
        self.assertHeader("Expires", "Sun, 28 Jan 2007 00:00:00 GMT")
        
        # static content should now have "cache prevention" headers
        self.getPage("/expires/index.html")
        self.assertStatus("200 OK")
        self.assertHeader("Pragma", "no-cache")
        if cherrypy.server.protocol_version == "HTTP/1.1":
            self.assertHeader("Cache-Control", "no-cache, must-revalidate")
        self.assertHeader("Expires", "Sun, 28 Jan 2007 00:00:00 GMT")
        
        # the cacheable handler should now have "cache prevention" headers
        self.getPage("/expires/cacheable")
        self.assertStatus("200 OK")
        self.assertHeader("Pragma", "no-cache")
        if cherrypy.server.protocol_version == "HTTP/1.1":
            self.assertHeader("Cache-Control", "no-cache, must-revalidate")
        self.assertHeader("Expires", "Sun, 28 Jan 2007 00:00:00 GMT")
        
        self.getPage('/expires/dynamic')
        self.assertBody("D-d-d-dynamic!")
        # dynamic sets Cache-Control to private but it should  be
        # overwritten here ...
        self.assertHeader("Pragma", "no-cache")
        if cherrypy.server.protocol_version == "HTTP/1.1":
            self.assertHeader("Cache-Control", "no-cache, must-revalidate")
        self.assertHeader("Expires", "Sun, 28 Jan 2007 00:00:00 GMT")
    
    def testLastModified(self):
        self.getPage("/a.gif")
        self.assertStatus(200)
        self.assertBody(gif_bytes)
        lm1 = self.assertHeader("Last-Modified")
        
        # this request should get the cached copy.
        self.getPage("/a.gif")
        self.assertStatus(200)
        self.assertBody(gif_bytes)
        self.assertHeader("Age")
        lm2 = self.assertHeader("Last-Modified")
        self.assertEqual(lm1, lm2)
        
        # this request should match the cached copy, but raise 304.
        self.getPage("/a.gif", [('If-Modified-Since', lm1)])
        self.assertStatus(304)
        self.assertNoHeader("Last-Modified")
        self.assertHeader("Age")


if __name__ == '__main__':
    setup_server()
    helper.testmain()