Mercurial > piecrust2

annotate piecrust/serving/middlewares.py @ 1051:971b4d67e82a

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serve: Fix problems with assets disappearing between servings. When an asset file changes, its source's pipeline is re-run. But that created a bake record that only had that pipeline's output, so the other outputs were incorrectly considered empty and therefore any stray files were removed. Now we copy over bake records for the pipelines we don't run.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 26 Jan 2018 18:05:02 -0800
parents 33a89139c284
children 8d5b8a3dca02
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1 import os.path
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2 from werkzeug.exceptions import 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 return handler(request, start_response)
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75
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76 return self.app(environ, start_response)
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77
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78 def _getDebugInfo(self, request, start_response):
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79 app = get_app_for_server(self.appfactory)
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80 if not app.config.get('site/enable_debug_info'):
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81 return Forbidden()
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82
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83 found = False
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84 page_path = request.args.get('page')
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85 try:
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86 req_page = get_requested_page(app, page_path)
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87 found = (req_page is not None)
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88 except (RouteNotFoundError, PageNotFoundError):
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89 pass
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90 if not found:
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91 return NotFound("No such page: %s" % page_path)
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92
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93 ctx = DataBuildingContext(req_page.page,
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94 sub_num=req_page.sub_num)
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95 data = build_page_data(ctx)
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96
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97 var_path = request.args.getlist('var')
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98 if not var_path:
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99 var_path = None
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100 output = build_var_debug_info(data, var_path)
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101
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102 response = Response(output, mimetype='text/html')
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103 return response(request.environ, start_response)
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104
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105 def _shutdownWerkzeug(self, request, start_response):
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106 shutdown_func = request.environ.get('werkzeug.server.shutdown')
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107 if shutdown_func is None:
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108 raise RuntimeError('Not running with the Werkzeug Server')
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109 shutdown_func()
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110 response = Response("Server shutting down...")
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111 return response(request.environ, start_response)
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112
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113 def _startSSEProvider(self, request, start_response):
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114 from piecrust.serving.procloop import (
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115 PipelineStatusServerSentEventProducer)
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116 provider = PipelineStatusServerSentEventProducer(
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117 self._proc_loop)
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118 it = provider.run()
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119 response = Response(it, mimetype='text/event-stream')
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120 response.headers['Cache-Control'] = 'no-cache'
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121 response.headers['Last-Event-ID'] = \
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122 self._proc_loop.last_status_id
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123 return ClosingIterator(
852
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124 response(request.environ, start_response),
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125 [provider.close])
553
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126