Mercurial > piecrust2

annotate piecrust/serving/middlewares.py @ 1166:d8167cbee2f5

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cm: Add new pytest cache dirs to hgignore.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 04 Oct 2019 09:01:41 -0700
parents 8d5b8a3dca02
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import os.path
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2 from werkzeug.exceptions import HTTPException, NotFound, Forbidden
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3 from werkzeug.wrappers import Request, Response
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4 from werkzeug.wsgi import ClosingIterator
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5 from piecrust import RESOURCES_DIR, CACHE_DIR
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6 from piecrust.data.builder import (
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7 DataBuildingContext, build_page_data)
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8 from piecrust.data.debug import build_var_debug_info
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9 from piecrust.page import PageNotFoundError
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10 from piecrust.routing import RouteNotFoundError
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11 from piecrust.serving.util import (
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12 make_wrapped_file_response, get_requested_page, get_app_for_server)
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14
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15 class PieCrustStaticResourcesMiddleware(object):
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16 """ WSGI middleware that serves static files from the `resources/server`
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17 directory in the PieCrust package.
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18 """
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19 def __init__(self, app):
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20 self.app = app
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21
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22 def __call__(self, environ, start_response):
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23 static_mount = '/__piecrust_static/'
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24
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25 request = Request(environ)
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26 if request.path.startswith(static_mount):
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27 rel_req_path = request.path[len(static_mount):]
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28 mount = os.path.join(RESOURCES_DIR, 'server')
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29 full_path = os.path.join(mount, rel_req_path)
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30 try:
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31 response = make_wrapped_file_response(
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32 environ, request, full_path)
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33 return response(environ, start_response)
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34 except OSError:
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35 pass
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36
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37 return self.app(environ, start_response)
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38
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39
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40 class PieCrustDebugMiddleware(object):
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41 """ WSGI middleware that handles debugging of PieCrust stuff, and runs
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42 the asset pipeline in an SSE thread.
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43 """
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44 def __init__(self, app, appfactory,
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45 run_sse_check=None):
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46 self.app = app
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47 self.appfactory = appfactory
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48 self.run_sse_check = run_sse_check
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49 self._proc_loop = None
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50 self._out_dir = os.path.join(
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51 appfactory.root_dir, CACHE_DIR, appfactory.cache_key, 'server')
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52 self._handlers = {
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53 'debug_info': self._getDebugInfo,
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54 'werkzeug_shutdown': self._shutdownWerkzeug,
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55 'pipeline_status': self._startSSEProvider}
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56
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57 if not self.run_sse_check or self.run_sse_check():
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58 # When using a server with code reloading, some implementations
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59 # use process forking and we end up going here twice. We only want
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60 # to start the pipeline loop in the inner process most of the
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61 # time so we let the implementation tell us if this is OK.
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62 from piecrust.serving.procloop import ProcessingLoop
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63 self._proc_loop = ProcessingLoop(self.appfactory, self._out_dir)
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64 self._proc_loop.start()
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65
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66 def __call__(self, environ, start_response):
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67 debug_mount = '/__piecrust_debug/'
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68
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69 request = Request(environ)
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70 if request.path.startswith(debug_mount):
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71 rel_req_path = request.path[len(debug_mount):]
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72 handler = self._handlers.get(rel_req_path)
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73 if handler is not None:
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74 try:
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75 return handler(request, start_response)
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76 except HTTPException as ex:
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77 return ex(environ, start_response)
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78
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79 return self.app(environ, start_response)
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80
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81 def _getDebugInfo(self, request, start_response):
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82 app = get_app_for_server(self.appfactory)
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83 if not app.config.get('site/enable_debug_info', True):
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84 raise Forbidden("PieCrust debug info isn't enabled.")
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85
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86 found = False
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87 page_path = request.args.get('page')
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88 try:
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89 req_page = get_requested_page(app, page_path)
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90 found = (req_page is not None)
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91 except (RouteNotFoundError, PageNotFoundError):
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92 pass
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93 if not found:
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94 raise NotFound("No such page: %s" % page_path)
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95
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96 ctx = DataBuildingContext(req_page.page,
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97 sub_num=req_page.sub_num)
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98 data = build_page_data(ctx)
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99
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100 var_path = request.args.getlist('var')
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101 if not var_path:
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102 var_path = None
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103 output = build_var_debug_info(data, var_path)
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104
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105 response = Response(output, mimetype='text/html')
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106 return response(request.environ, start_response)
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107
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108 def _shutdownWerkzeug(self, request, start_response):
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109 shutdown_func = request.environ.get('werkzeug.server.shutdown')
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110 if shutdown_func is None:
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111 raise RuntimeError('Not running with the Werkzeug Server')
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112 shutdown_func()
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113 response = Response("Server shutting down...")
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114 return response(request.environ, start_response)
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115
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116 def _startSSEProvider(self, request, start_response):
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117 from piecrust.serving.procloop import (
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118 PipelineStatusServerSentEventProducer)
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119 provider = PipelineStatusServerSentEventProducer(
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120 self._proc_loop)
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121 it = provider.run()
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122 response = Response(it, mimetype='text/event-stream')
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123 response.headers['Cache-Control'] = 'no-cache'
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124 response.headers['Last-Event-ID'] = \
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125 self._proc_loop.last_status_id
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126 return ClosingIterator(
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127 response(request.environ, start_response),
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128 [provider.close])
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129