Mercurial > cgi-bin > hgweb.cgi > tincan
annotate tincan.py @ 10:84998cd4e123 draft
Add more provisional documentation.
| author | David Barts <n5jrn@me.com> |
|---|---|
| date | Mon, 13 May 2019 21:24:48 -0700 |
| parents | 75e375b1976a |
| children | 8037bad7d5a8 |
| rev | line source |
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| 0 | 1 #!/usr/bin/env python3 |
| 2 # -*- coding: utf-8 -*- | |
| 3 # As with Bottle, it's all in one big, ugly file. For now. | |
| 4 | |
| 5 # I m p o r t s | |
| 6 | |
| 7 import os, sys | |
| 8 import ast | |
| 9 import binascii | |
| 10 from base64 import b16encode, b16decode | |
|
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11 import functools |
| 2 | 12 import importlib |
|
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13 from inspect import isclass |
| 0 | 14 import io |
| 2 | 15 import py_compile |
| 16 from stat import S_ISDIR, S_ISREG | |
| 5 | 17 from string import whitespace |
| 0 | 18 |
| 19 import bottle | |
| 20 | |
| 2 | 21 # E x c e p t i o n s |
| 0 | 22 |
| 23 class TinCanException(Exception): | |
| 24 """ | |
| 25 The parent class of all exceptions we raise. | |
| 26 """ | |
| 27 pass | |
| 28 | |
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29 class TemplateHeaderError(TinCanException): |
| 0 | 30 """ |
| 31 Raised upon encountering a syntax error in the template headers. | |
| 32 """ | |
| 33 def __init__(self, message, line): | |
| 34 super().__init__(message, line) | |
| 35 self.message = message | |
| 36 self.line = line | |
| 37 | |
| 38 def __str__(self): | |
|
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39 return "line {0}: {1}".format(self.line, self.message) |
| 0 | 40 |
| 41 class ForwardException(TinCanException): | |
| 42 """ | |
| 43 Raised to effect the flow control needed to do a forward (server-side | |
| 44 redirect). It is ugly to do this, but other Python frameworks do and | |
| 45 there seems to be no good alternative. | |
| 46 """ | |
| 47 def __init__(self, target): | |
| 48 self.target = target | |
| 49 | |
| 50 class TinCanError(TinCanException): | |
| 51 """ | |
| 52 General-purpose exception thrown by TinCan when things go wrong, often | |
| 53 when attempting to launch webapps. | |
| 54 """ | |
| 55 pass | |
| 56 | |
| 2 | 57 # T e m p l a t e s |
| 58 # | |
| 0 | 59 # Template (.pspx) files. These are standard templates for a supported |
| 60 # template engine, but with an optional set of header lines that begin | |
| 61 # with '#'. | |
| 62 | |
| 63 class TemplateFile(object): | |
| 64 """ | |
| 65 Parse a template file into a header part and the body part. The header | |
| 66 is always a leading set of lines, each starting with '#', that is of the | |
| 67 same format regardless of the template body. The template body varies | |
| 68 depending on the selected templating engine. The body part has | |
| 69 each header line replaced by a blank line. This preserves the overall | |
| 70 line numbering when processing the body. The added newlines are normally | |
| 71 stripped out before the rendered page is sent back to the client. | |
| 72 """ | |
| 5 | 73 _END = "#end" |
| 74 _LEND = len(_END) | |
| 75 _WS = set(whitespace) | |
| 76 | |
| 0 | 77 def __init__(self, raw, encoding='utf-8'): |
| 78 if isinstance(raw, io.TextIOBase): | |
| 79 self._do_init(raw) | |
| 80 elif isinstance(raw, str): | |
| 81 with open(raw, "r", encoding=encoding) as fp: | |
| 82 self._do_init(fp) | |
| 83 else: | |
| 84 raise TypeError("Expecting a string or Text I/O object.") | |
| 85 | |
| 86 def _do_init(self, fp): | |
| 87 self._hbuf = [] | |
| 88 self._bbuf = [] | |
| 89 self._state = self._header | |
| 90 while True: | |
| 91 line = fp.readline() | |
| 92 if line == '': | |
| 93 break | |
| 94 self._state(line) | |
| 95 self.header = ''.join(self._hbuf) | |
| 96 self.body = ''.join(self._bbuf) | |
| 97 | |
| 98 def _header(self, line): | |
| 99 if not line.startswith('#'): | |
| 100 self._state = self._body | |
| 101 self._state(line) | |
| 102 return | |
| 5 | 103 if line.startswith(self._END) and (len(line) == self._LEND or line[self._LEND] in self._WS): |
| 104 self._state = self._body | |
| 0 | 105 self._hbuf.append(line) |
| 106 self._bbuf.append("\n") | |
| 107 | |
| 108 def _body(self, line): | |
| 109 self._bbuf.append(line) | |
| 110 | |
| 111 class TemplateHeader(object): | |
| 112 """ | |
| 113 Parses and represents a set of header lines. | |
| 114 """ | |
| 2 | 115 _NAMES = [ "errors", "forward", "methods", "python", "template" ] |
| 0 | 116 _FNAMES = [ "hidden" ] |
| 117 | |
| 118 def __init__(self, string): | |
| 119 # Initialize our state | |
| 120 for i in self._NAMES: | |
| 121 setattr(self, i, None) | |
| 122 for i in self._FNAMES: | |
| 123 setattr(self, i, False) | |
| 124 # Parse the string | |
| 125 count = 0 | |
| 126 nameset = set(self._NAMES + self._FNAMES) | |
| 127 seen = set() | |
| 128 lines = string.split("\n") | |
| 129 if lines and lines[-1] == "": | |
| 130 del lines[-1] | |
| 131 for line in lines: | |
| 132 # Get line | |
| 133 count += 1 | |
| 134 if not line.startswith("#"): | |
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135 raise TemplateHeaderError("Does not start with '#'.", count) |
| 0 | 136 try: |
| 137 rna, rpa = line.split(maxsplit=1) | |
| 138 except ValueError: | |
| 5 | 139 rna = line.rstrip() |
| 140 rpa = None | |
| 0 | 141 # Get name, ignoring remarks. |
| 142 name = rna[1:] | |
| 143 if name == "rem": | |
| 144 continue | |
| 5 | 145 if name == "end": |
| 146 break | |
| 0 | 147 if name not in nameset: |
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148 raise TemplateHeaderError("Invalid directive: {0!r}".format(rna), count) |
| 0 | 149 if name in seen: |
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150 raise TemplateHeaderError("Duplicate {0!r} directive.".format(rna), count) |
| 0 | 151 seen.add(name) |
| 152 # Flags | |
| 5 | 153 if name in self._FNAMES: |
| 0 | 154 setattr(self, name, True) |
| 155 continue | |
| 156 # Get parameter | |
| 5 | 157 if rpa is None: |
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158 raise TemplateHeaderError("Missing parameter.", count) |
| 0 | 159 param = rpa.strip() |
| 160 for i in [ "'", '"']: | |
| 161 if param.startswith(i) and param.endswith(i): | |
| 162 param = ast.literal_eval(param) | |
| 163 break | |
| 164 # Update this object | |
| 165 setattr(self, name, param) | |
| 166 | |
| 2 | 167 # C h a m e l e o n |
| 168 # | |
| 0 | 169 # Support for Chameleon templates (the kind TinCan uses by default). |
| 170 | |
| 171 class ChameleonTemplate(bottle.BaseTemplate): | |
| 172 def prepare(self, **options): | |
| 173 from chameleon import PageTemplate, PageTemplateFile | |
| 174 if self.source: | |
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175 self.tpl = PageTemplate(self.source, encoding=self.encoding, |
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176 **options) |
| 0 | 177 else: |
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178 self.tpl = PageTemplateFile(self.filename, encoding=self.encoding, |
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179 search_path=self.lookup, **options) |
| 0 | 180 |
| 181 def render(self, *args, **kwargs): | |
| 182 for dictarg in args: | |
| 183 kwargs.update(dictarg) | |
| 184 _defaults = self.defaults.copy() | |
| 185 _defaults.update(kwargs) | |
| 186 return self.tpl.render(**_defaults) | |
| 187 | |
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188 chameleon_template = functools.partial(bottle.template, template_adapter=ChameleonTemplate) |
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189 chameleon_view = functools.partial(bottle.view, template_adapter=ChameleonTemplate) |
| 0 | 190 |
| 2 | 191 # U t i l i t i e s |
| 0 | 192 |
| 193 def _normpath(base, unsplit): | |
| 194 """ | |
| 195 Split, normalize and ensure a possibly relative path is absolute. First | |
| 196 argument is a list of directory names, defining a base. Second | |
| 197 argument is a string, which may either be relative to that base, or | |
| 198 absolute. Only '/' is supported as a separator. | |
| 199 """ | |
| 200 scratch = unsplit.strip('/').split('/') | |
| 201 if not unsplit.startswith('/'): | |
| 202 scratch = base + scratch | |
| 203 ret = [] | |
| 204 for i in scratch: | |
| 205 if i == '.': | |
| 206 continue | |
| 207 if i == '..': | |
| 208 ret.pop() # may raise IndexError | |
| 209 continue | |
| 210 ret.append(i) | |
| 211 return ret | |
| 212 | |
| 213 def _mangle(string): | |
| 214 """ | |
| 215 Turn a possibly troublesome identifier into a mangled one. | |
| 216 """ | |
| 217 first = True | |
| 218 ret = [] | |
| 219 for ch in string: | |
| 220 if ch == '_' or not (ch if first else "x" + ch).isidentifier(): | |
| 221 ret.append('_') | |
| 222 ret.append(b16encode(ch.encode("utf-8")).decode("us-ascii")) | |
| 223 else: | |
| 224 ret.append(ch) | |
| 225 first = False | |
| 226 return ''.join(ret) | |
| 227 | |
| 228 # The TinCan class. Simply a Bottle webapp that contains a forward method, so | |
| 229 # the code-behind can call request.app.forward(). | |
| 230 | |
| 231 class TinCan(bottle.Bottle): | |
| 232 def forward(self, target): | |
| 233 """ | |
| 234 Forward this request to the specified target route. | |
| 235 """ | |
| 236 source = bottle.request.environ['PATH_INFO'] | |
| 237 base = source.strip('/').split('/')[:-1] | |
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238 if bottle.request.environ.get(_FTYPE, False): |
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239 raise TinCanError("{0}: forward from error page".format(source)) |
| 0 | 240 try: |
| 241 exc = ForwardException('/' + '/'.join(_normpath(base, target))) | |
| 242 except IndexError as e: | |
| 243 raise TinCanError("{0}: invalid forward to {1!r}".format(source, target)) from e | |
| 244 raise exc | |
| 245 | |
| 2 | 246 # C o d e B e h i n d |
| 247 # | |
| 0 | 248 # Represents the code-behind of one of our pages. This gets subclassed, of |
| 249 # course. | |
| 250 | |
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251 class BasePage(object): |
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252 """ |
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253 The parent class of both error and normal pages. |
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254 """ |
| 0 | 255 def handle(self): |
| 256 """ | |
| 257 This is the entry point for the code-behind logic. It is intended | |
| 258 to be overridden. | |
| 259 """ | |
| 260 pass | |
| 261 | |
| 262 def export(self): | |
| 263 """ | |
| 264 Export template variables. The default behavior is to export all | |
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265 non-hidden non-callables that don't start with an underscore. |
| 0 | 266 This method can be overridden if a different behavior is |
| 267 desired. It should always return a dict or dict-like object. | |
| 268 """ | |
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269 ret = { 'page': self } |
| 0 | 270 for name in dir(self): |
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271 if name in self._HIDDEN or name.startswith('_'): |
| 0 | 272 continue |
| 273 value = getattr(self, name) | |
| 274 if callable(value): | |
| 275 continue | |
| 276 ret[name] = value | |
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277 return ret |
| 0 | 278 |
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279 class Page(BasePage): |
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280 # Non-private things we refuse to export anyhow. |
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281 _HIDDEN = set([ "request", "response" ]) |
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282 |
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283 def __init__(self, req, resp): |
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284 """ |
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285 Constructor. This is a lightweight operation. |
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286 """ |
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287 self.request = req # app context is request.app in Bottle |
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288 self.response = resp |
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289 |
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290 class ErrorPage(BasePage): |
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291 """ |
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292 The code-behind for an error page. |
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293 """ |
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294 _HIDDEN = set() |
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295 |
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296 def __init__(self, req, err): |
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297 """ |
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298 Constructor. This is a lightweight operation. |
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299 """ |
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300 self.request = req |
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301 self.error = err |
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302 |
| 2 | 303 # R o u t e s |
| 304 # | |
| 0 | 305 # Represents a route in TinCan. Our launcher creates these on-the-fly based |
| 306 # on the files it finds. | |
| 307 | |
| 2 | 308 _ERRMIN = 400 |
| 309 _ERRMAX = 599 | |
| 310 _PEXTEN = ".py" | |
| 311 _TEXTEN = ".pspx" | |
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312 _FLOOP = "tincan.forwards" |
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313 _FORIG = "tincan.origin" |
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314 _FTYPE = "tincan.iserror" |
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315 |
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316 class _TinCanErrorRoute(object): |
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317 """ |
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318 A route to an error page. These don't get routes created for them, |
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319 and are only reached if an error routes them there. Unless you create |
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320 custom code-behind, only two variables are available to your template: |
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321 request (bottle.Request) and error (bottle.HTTPError). |
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322 """ |
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323 def __init__(self, template, klass): |
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324 self._template = template |
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325 self._template.prepare() |
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326 self._class = klass |
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327 |
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328 def __call__(self, e): |
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329 obj = self._class(bottle.request, e) |
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330 obj.handle() |
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331 return self._template.render(obj.export()).lstrip('\n') |
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332 |
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333 class _TinCanRoute(object): |
| 0 | 334 """ |
| 335 A route created by the TinCan launcher. | |
| 336 """ | |
| 337 def __init__(self, launcher, name, subdir): | |
| 338 self._fsroot = launcher.fsroot | |
| 339 self._urlroot = launcher.urlroot | |
| 340 self._name = name | |
| 2 | 341 self._python = name + _PEXTEN |
| 342 self._fspath = os.path.join(launcher.fsroot, *subdir, name + _TEXTEN) | |
| 343 self._urlpath = self._urljoin(launcher.urlroot, *subdir, name + _TEXTEN) | |
| 0 | 344 self._origin = self._urlpath |
| 345 self._subdir = subdir | |
| 346 self._seen = set() | |
| 347 self._tclass = launcher.tclass | |
| 348 self._app = launcher.app | |
| 349 | |
| 2 | 350 def launch(self): |
| 0 | 351 """ |
| 352 Launch a single page. | |
| 353 """ | |
| 354 # Build master and header objects, process #forward directives | |
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355 hidden = oerrors = None |
| 0 | 356 while True: |
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357 if oerrors is not None and oerrors != self._header.errors: |
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358 raise TinCanError("{0}: invalid redirect") |
| 0 | 359 self._template = TemplateFile(self._fspath) |
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360 try: |
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361 self._header = TemplateHeader(self._template.header) |
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362 except TemplateHeaderError as e: |
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363 raise TinCanError("{0}: {1!s}".format(self._fspath, e)) from e |
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364 oerrors = self._header.errors |
| 0 | 365 if hidden is None: |
| 366 hidden = self._header.hidden | |
| 3 | 367 elif self._header.errors is not None: |
| 368 raise TinCanError("{0}: #forward to #errors not allowed".format(self._origin)) | |
| 0 | 369 if self._header.forward is None: |
| 370 break | |
| 371 self._redirect() | |
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372 # If this is a #hidden page, we ignore it for now, since hidden pages |
| 0 | 373 # don't get routes made for them. |
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374 if hidden and not self._headers.errors: |
| 0 | 375 return |
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376 # Get the code-behind #python |
| 0 | 377 if self._header.python is not None: |
| 2 | 378 if not self._header.python.endswith(_PEXTEN): |
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379 raise TinCanError("{0}: #python files must end in {1}".format(self._urlpath, _PEXTEN)) |
| 0 | 380 self._python = self._header.python |
| 381 # Obtain a class object by importing and introspecting a module. | |
| 3 | 382 self._getclass() |
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383 # Build body object (#template) |
| 3 | 384 if self._header.template is not None: |
| 385 if not self._header.template.endswith(_TEXTEN): | |
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386 raise TinCanError("{0}: #template files must end in {1}".format(self._urlpath, _TEXTEN)) |
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387 tpath = os.path.normpath(os.path.join(self._fsroot, *self._splitpath(self._header.template))) |
| 3 | 388 tfile = TemplateFile(tpath) |
| 389 self._body = self._tclass(source=tfile.body) | |
| 390 else: | |
| 391 self._body = self._tclass(source=self._template.body) | |
| 392 self._body.prepare() | |
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393 # If this is an #errors page, register it as such. |
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394 if self._header.errors is not None: |
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395 self._mkerror() |
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396 return # this implies #hidden |
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397 # Get #methods for this route |
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398 if self._header.methods is None: |
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399 methods = [ 'GET' ] |
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400 else: |
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401 methods = [ i.upper() for i in self._header.methods.split() ] |
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402 if not methods: |
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403 raise TinCanError("{0}: no #methods specified".format(self._urlpath)) |
| 3 | 404 # Register this thing with Bottle |
| 6 | 405 print("adding route:", self._origin, '('+','.join(methods)+')') # debug |
| 3 | 406 self._app.route(self._origin, methods, self) |
| 407 | |
| 408 def _splitpath(self, unsplit): | |
| 409 return _normpath(self._subdir, unsplit) | |
| 410 | |
| 411 def _mkerror(self): | |
| 412 try: | |
| 413 errors = [ int(i) for i in self._header.errors.split() ] | |
| 414 except ValueError as e: | |
| 415 raise TinCanError("{0}: bad #errors line".format(self._urlpath)) from e | |
| 416 if not errors: | |
| 417 errors = range(_ERRMIN, _ERRMAX+1) | |
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418 route = _TinCanErrorRoute(self._tclass(source=self._template.body), self._class) |
| 3 | 419 for error in errors: |
| 420 if error < _ERRMIN or error > _ERRMAX: | |
| 421 raise TinCanError("{0}: bad #errors code".format(self._urlpath)) | |
| 5 | 422 self._app.error_handler[error] = route # XXX |
| 3 | 423 |
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424 def _gettime(self, path): |
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425 try: |
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426 return os.stat(path).st_mtime |
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427 except FileNotFoundError: |
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428 return 0 |
| 8 | 429 except OSError as e: |
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430 raise TinCanError(str(e)) from e |
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431 |
| 3 | 432 def _getclass(self): |
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433 pypath = os.path.normpath(os.path.join(self._fsroot, *self._splitpath(self._python))) |
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434 klass = ErrorPage if self._header.errors else Page |
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435 # Give 'em a default code-behind if they don't furnish one |
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436 pytime = self._gettime(pypath) |
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437 if not pytime: |
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438 self._class = klass |
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439 return |
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440 # Else load the code-behind from a .py file |
| 0 | 441 pycpath = pypath + 'c' |
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442 pyctime = self._gettime(pycpath) |
| 0 | 443 try: |
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444 if pyctime < pytime: |
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445 py_compile.compile(pypath, cfile=pycpath, doraise=True) |
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446 except py_compile.PyCompileError as e: |
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447 raise TinCanError(str(e)) from e |
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448 except Exception as e: |
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449 raise TinCanError("{0}: {1!s}".format(pypath, e)) from e |
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450 try: |
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451 spec = importlib.util.spec_from_file_location(_mangle(self._name), pycpath) |
| 0 | 452 mod = importlib.util.module_from_spec(spec) |
| 453 spec.loader.exec_module(mod) | |
| 454 except Exception as e: | |
| 455 raise TinCanError("{0}: error importing".format(pycpath)) from e | |
| 456 self._class = None | |
| 457 for i in dir(mod): | |
| 458 v = getattr(mod, i) | |
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459 if isclass(v) and issubclass(v, klass): |
| 0 | 460 if self._class is not None: |
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461 raise TinCanError("{0}: contains multiple {1} classes".format(pypath, klass.__name__)) |
| 0 | 462 self._class = v |
| 3 | 463 if self._class is None: |
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464 raise TinCanError("{0}: contains no {1} classes".format(pypath, klass.__name__)) |
| 0 | 465 |
| 466 def _redirect(self): | |
| 467 try: | |
| 468 rlist = self._splitpath(self._header.forward) | |
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469 forw = '/' + '/'.join(rlist) |
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470 if forw in self.seen: |
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471 raise TinCanError("{0}: #forward loop".format(self._origin)) |
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472 self._seen.add(forw) |
| 0 | 473 rname = rlist.pop() |
| 474 except IndexError as e: | |
| 475 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) from e | |
| 476 name, ext = os.path.splitext(rname)[1] | |
| 2 | 477 if ext != _TEXTEN: |
| 0 | 478 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) |
| 479 self._subdir = rlist | |
| 2 | 480 self._python = name + _PEXTEN |
| 0 | 481 self._fspath = os.path.join(self._fsroot, *self._subdir, rname) |
| 482 self._urlpath = self._urljoin(*self._subdir, rname) | |
| 483 | |
| 484 def _urljoin(self, *args): | |
| 485 args = list(args) | |
| 486 if args[0] == '/': | |
| 487 args[0] = '' | |
| 488 return '/'.join(args) | |
| 489 | |
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490 def __call__(self): |
| 0 | 491 """ |
| 492 This gets called by the framework AFTER the page is launched. | |
| 493 """ | |
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494 target = None |
| 2 | 495 obj = self._class(bottle.request, bottle.response) |
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496 try: |
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497 obj.handle() |
| 2 | 498 return self._body.render(obj.export()).lstrip('\n') |
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499 except ForwardException as fwd: |
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500 target = fwd.target |
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501 if target is None: |
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502 raise TinCanError("{0}: unexpected null target".format(self._urlpath)) |
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503 # We get here if we are doing a server-side programmatic |
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504 # forward. |
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505 environ = bottle.request.environ |
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506 if _FORIG not in environ: |
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507 environ[_FORIG] = self._urlpath |
| 2 | 508 if _FLOOP not in environ: |
| 509 environ[_FLOOP] = set([self._urlpath]) | |
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510 elif target in environ[_FLOOP]: |
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511 raise TinCanError("{0}: forward loop detected".format(environ[_FORIG])) |
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512 environ[_FLOOP].add(target) |
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513 environ['bottle.raw_path'] = target |
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514 environ['PATH_INFO'] = urllib.parse.quote(target) |
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515 route, args = self._app.router.match(environ) |
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516 environ['route.handle'] = environ['bottle.route'] = route |
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517 environ['route.url_args'] = args |
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518 return route.call(**args) |
| 0 | 519 |
| 520 def _mkdict(self, obj): | |
| 521 ret = {} | |
| 522 for name in dir(obj): | |
| 523 if name.startswith('_'): | |
| 524 continue | |
| 525 value = getattr(obj, name) | |
| 526 if not callable(value): | |
| 527 ret[name] = value | |
| 528 return ret | |
| 2 | 529 |
| 530 # L a u n c h e r | |
| 531 | |
| 532 _WINF = "WEB-INF" | |
| 533 _BANNED = set([_WINF]) | |
| 534 | |
| 535 class _Launcher(object): | |
| 536 """ | |
| 537 Helper class for launching webapps. | |
| 538 """ | |
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539 def __init__(self, fsroot, urlroot, tclass, logger): |
| 2 | 540 """ |
| 541 Lightweight constructor. The real action happens in .launch() below. | |
| 542 """ | |
| 543 self.fsroot = fsroot | |
| 544 self.urlroot = urlroot | |
| 545 self.tclass = tclass | |
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546 self.logger = logger |
| 2 | 547 self.app = None |
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548 self.errors = 0 |
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549 self.debug = False |
| 2 | 550 |
| 551 def launch(self): | |
| 552 """ | |
| 553 Does the actual work of launching something. XXX - modifies sys.path | |
| 554 and never un-modifies it. | |
| 555 """ | |
| 556 # Sanity checks | |
| 557 if not self.urlroot.startswith("/"): | |
| 558 raise TinCanError("urlroot must be absolute") | |
| 559 if not os.path.isdir(self.fsroot): | |
| 560 raise TinCanError("no such directory: {0!r}".format(self.fsroot)) | |
| 561 # Make WEB-INF, if needed | |
| 562 winf = os.path.join(self.fsroot, _WINF) | |
| 563 lib = os.path.join(winf, "lib") | |
| 564 for i in [ winf, lib ]: | |
| 565 if not os.path.isdir(i): | |
| 566 os.mkdir(i) | |
| 567 # Add our private lib directory to sys.path | |
| 568 sys.path.insert(1, os.path.abspath(lib)) | |
| 569 # Do what we gotta do | |
| 570 self.app = TinCan() | |
| 571 self._launch([]) | |
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572 return self |
| 2 | 573 |
| 574 def _launch(self, subdir): | |
| 575 for entry in os.listdir(os.path.join(self.fsroot, *subdir)): | |
| 576 if not subdir and entry in _BANNED: | |
| 577 continue | |
| 578 etype = os.stat(os.path.join(self.fsroot, *subdir, entry)).st_mode | |
| 579 if S_ISREG(etype): | |
| 580 ename, eext = os.path.splitext(entry) | |
| 581 if eext != _TEXTEN: | |
| 582 continue # only look at interesting files | |
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583 route = _TinCanRoute(self, ename, subdir) |
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584 try: |
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585 route.launch() |
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586 except TinCanError as e: |
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587 self.logger(str(e)) |
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588 if self.debug: |
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589 while e.__cause__ != None: |
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590 e = e.__cause__ |
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591 self.logger("\t{0}: {1!s}".format(e.__class__.__name__, e)) |
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592 self.errors += 1 |
| 2 | 593 elif S_ISDIR(etype): |
| 594 self._launch(subdir + [entry]) | |
| 595 | |
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596 def _logger(message): |
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597 sys.stderr.write(message) |
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598 sys.stderr.write('\n') |
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599 |
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600 def launch(fsroot=None, urlroot='/', tclass=ChameleonTemplate, logger=_logger): |
| 2 | 601 """ |
| 602 Launch and return a TinCan webapp. Does not run the app; it is the | |
| 603 caller's responsibility to call app.run() | |
| 604 """ | |
| 605 if fsroot is None: | |
| 606 fsroot = os.getcwd() | |
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607 launcher = _Launcher(fsroot, urlroot, tclass, logger) |
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608 # launcher.debug = True |
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609 launcher.launch() |
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610 return launcher.app, launcher.errors |
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611 |
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612 # XXX - We cannot implement a command-line launcher here; see the |
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613 # launcher script for why. |