Mercurial > cgi-bin > hgweb.cgi > tincan
annotate tincan.py @ 24:34d3cfcd37ef draft header-includes
First batch of work on getting a #include header. Unfinished.
| author | David Barts <n5jrn@me.com> |
|---|---|
| date | Wed, 22 May 2019 07:47:16 -0700 |
| parents | e8b6ee7e5b6b |
| children | e93e5e746cc5 |
| rev | line source |
|---|---|
| 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 |
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18 import traceback |
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19 import urllib |
| 0 | 20 |
| 21 import bottle | |
| 22 | |
| 2 | 23 # E x c e p t i o n s |
| 0 | 24 |
| 25 class TinCanException(Exception): | |
| 26 """ | |
| 27 The parent class of all exceptions we raise. | |
| 28 """ | |
| 29 pass | |
| 30 | |
|
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31 class BaseSyntaxError(TinCanException): |
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32 |
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33 |
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34 class TemplateHeaderError(TinCanException): |
| 0 | 35 """ |
| 36 Raised upon encountering a syntax error in the template headers. | |
| 37 """ | |
| 38 def __init__(self, message, line): | |
| 39 super().__init__(message, line) | |
| 40 self.message = message | |
| 41 self.line = line | |
| 42 | |
| 43 def __str__(self): | |
|
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44 return "line {0}: {1}".format(self.line, self.message) |
| 0 | 45 |
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46 class IncludeError(TinCanException): |
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47 """ |
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48 Raised when we run into problems #include'ing something, usually |
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49 because it doesn't exist. |
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50 """ |
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51 def __init__(self, message, source): |
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52 super().__init__(message, source) |
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53 self.message = message |
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54 self.source = source |
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55 |
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56 def __str__(self): |
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57 return "{0}: {1}".format(self.source, self.message) |
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58 |
| 0 | 59 class ForwardException(TinCanException): |
| 60 """ | |
| 61 Raised to effect the flow control needed to do a forward (server-side | |
| 62 redirect). It is ugly to do this, but other Python frameworks do and | |
| 63 there seems to be no good alternative. | |
| 64 """ | |
| 65 def __init__(self, target): | |
| 66 self.target = target | |
| 67 | |
| 68 class TinCanError(TinCanException): | |
| 69 """ | |
| 70 General-purpose exception thrown by TinCan when things go wrong, often | |
| 71 when attempting to launch webapps. | |
| 72 """ | |
| 73 pass | |
| 74 | |
| 2 | 75 # T e m p l a t e s |
| 76 # | |
| 0 | 77 # Template (.pspx) files. These are standard templates for a supported |
| 78 # template engine, but with an optional set of header lines that begin | |
| 79 # with '#'. | |
| 80 | |
| 81 class TemplateFile(object): | |
| 82 """ | |
| 83 Parse a template file into a header part and the body part. The header | |
| 84 is always a leading set of lines, each starting with '#', that is of the | |
| 85 same format regardless of the template body. The template body varies | |
| 86 depending on the selected templating engine. The body part has | |
| 87 each header line replaced by a blank line. This preserves the overall | |
| 88 line numbering when processing the body. The added newlines are normally | |
| 89 stripped out before the rendered page is sent back to the client. | |
| 90 """ | |
| 5 | 91 _END = "#end" |
| 92 _LEND = len(_END) | |
| 93 _WS = set(whitespace) | |
| 94 | |
| 0 | 95 def __init__(self, raw, encoding='utf-8'): |
| 96 if isinstance(raw, io.TextIOBase): | |
| 97 self._do_init(raw) | |
| 98 elif isinstance(raw, str): | |
| 99 with open(raw, "r", encoding=encoding) as fp: | |
| 100 self._do_init(fp) | |
| 101 else: | |
| 102 raise TypeError("Expecting a string or Text I/O object.") | |
| 103 | |
| 104 def _do_init(self, fp): | |
| 105 self._hbuf = [] | |
| 106 self._bbuf = [] | |
| 107 self._state = self._header | |
| 108 while True: | |
| 109 line = fp.readline() | |
| 110 if line == '': | |
| 111 break | |
| 112 self._state(line) | |
| 113 self.header = ''.join(self._hbuf) | |
| 114 self.body = ''.join(self._bbuf) | |
| 115 | |
| 116 def _header(self, line): | |
| 117 if not line.startswith('#'): | |
| 118 self._state = self._body | |
| 119 self._state(line) | |
| 120 return | |
| 5 | 121 if line.startswith(self._END) and (len(line) == self._LEND or line[self._LEND] in self._WS): |
| 122 self._state = self._body | |
| 0 | 123 self._hbuf.append(line) |
| 124 self._bbuf.append("\n") | |
| 125 | |
| 126 def _body(self, line): | |
| 127 self._bbuf.append(line) | |
| 128 | |
| 129 class TemplateHeader(object): | |
| 130 """ | |
| 131 Parses and represents a set of header lines. | |
| 132 """ | |
| 2 | 133 _NAMES = [ "errors", "forward", "methods", "python", "template" ] |
| 0 | 134 _FNAMES = [ "hidden" ] |
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135 _ANAMES = [ "include" ] |
| 0 | 136 |
| 137 def __init__(self, string): | |
| 138 # Initialize our state | |
| 139 for i in self._NAMES: | |
| 140 setattr(self, i, None) | |
| 141 for i in self._FNAMES: | |
| 142 setattr(self, i, False) | |
| 143 # Parse the string | |
| 144 count = 0 | |
| 145 nameset = set(self._NAMES + self._FNAMES) | |
| 146 seen = set() | |
| 147 lines = string.split("\n") | |
| 148 if lines and lines[-1] == "": | |
| 149 del lines[-1] | |
| 150 for line in lines: | |
| 151 # Get line | |
| 152 count += 1 | |
| 153 if not line.startswith("#"): | |
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154 raise TemplateHeaderError("Does not start with '#'.", count) |
| 0 | 155 try: |
| 156 rna, rpa = line.split(maxsplit=1) | |
| 157 except ValueError: | |
| 5 | 158 rna = line.rstrip() |
| 159 rpa = None | |
| 0 | 160 # Get name, ignoring remarks. |
| 161 name = rna[1:] | |
| 162 if name == "rem": | |
| 163 continue | |
| 5 | 164 if name == "end": |
| 165 break | |
| 0 | 166 if name not in nameset: |
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167 raise TemplateHeaderError("Invalid directive: {0!r}".format(rna), count) |
| 0 | 168 if name in seen: |
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169 raise TemplateHeaderError("Duplicate {0!r} directive.".format(rna), count) |
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170 if name not in self._ANAMES: |
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171 seen.add(name) |
| 0 | 172 # Flags |
| 5 | 173 if name in self._FNAMES: |
| 0 | 174 setattr(self, name, True) |
| 175 continue | |
| 176 # Get parameter | |
| 5 | 177 if rpa is None: |
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178 raise TemplateHeaderError("Missing parameter.", count) |
| 0 | 179 param = rpa.strip() |
| 180 for i in [ "'", '"']: | |
| 181 if param.startswith(i) and param.endswith(i): | |
| 182 param = ast.literal_eval(param) | |
| 183 break | |
| 184 # Update this object | |
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185 if name in self._ANAMES: |
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186 getattr(self, name).append(param) |
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187 else: |
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188 setattr(self, name, param) |
| 0 | 189 |
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190 # C h a m e l e o n |
| 2 | 191 # |
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192 # Support for Chameleon templates (the kind TinCan uses by default). |
| 0 | 193 |
| 194 class ChameleonTemplate(bottle.BaseTemplate): | |
| 195 def prepare(self, **options): | |
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196 from chameleon import PageTemplate, PageTemplateFile |
| 0 | 197 if self.source: |
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198 self.tpl = PageTemplate(self.source, encoding=self.encoding, |
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199 **options) |
| 0 | 200 else: |
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201 self.tpl = PageTemplateFile(self.filename, encoding=self.encoding, |
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202 search_path=self.lookup, **options) |
| 0 | 203 |
| 204 def render(self, *args, **kwargs): | |
| 205 for dictarg in args: | |
| 206 kwargs.update(dictarg) | |
| 207 _defaults = self.defaults.copy() | |
| 208 _defaults.update(kwargs) | |
| 209 return self.tpl.render(**_defaults) | |
| 210 | |
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211 chameleon_template = functools.partial(bottle.template, template_adapter=ChameleonTemplate) |
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212 chameleon_view = functools.partial(bottle.view, template_adapter=ChameleonTemplate) |
| 0 | 213 |
| 2 | 214 # U t i l i t i e s |
| 0 | 215 |
| 216 def _normpath(base, unsplit): | |
| 217 """ | |
| 218 Split, normalize and ensure a possibly relative path is absolute. First | |
| 219 argument is a list of directory names, defining a base. Second | |
| 220 argument is a string, which may either be relative to that base, or | |
| 221 absolute. Only '/' is supported as a separator. | |
| 222 """ | |
| 223 scratch = unsplit.strip('/').split('/') | |
| 224 if not unsplit.startswith('/'): | |
| 225 scratch = base + scratch | |
| 226 ret = [] | |
| 227 for i in scratch: | |
| 228 if i == '.': | |
| 229 continue | |
| 230 if i == '..': | |
| 231 ret.pop() # may raise IndexError | |
| 232 continue | |
| 233 ret.append(i) | |
| 234 return ret | |
| 235 | |
| 236 def _mangle(string): | |
| 237 """ | |
| 238 Turn a possibly troublesome identifier into a mangled one. | |
| 239 """ | |
| 240 first = True | |
| 241 ret = [] | |
| 242 for ch in string: | |
| 243 if ch == '_' or not (ch if first else "x" + ch).isidentifier(): | |
| 244 ret.append('_') | |
| 245 ret.append(b16encode(ch.encode("utf-8")).decode("us-ascii")) | |
| 246 else: | |
| 247 ret.append(ch) | |
| 248 first = False | |
| 249 return ''.join(ret) | |
| 250 | |
| 251 # The TinCan class. Simply a Bottle webapp that contains a forward method, so | |
| 252 # the code-behind can call request.app.forward(). | |
| 253 | |
| 254 class TinCan(bottle.Bottle): | |
| 255 def forward(self, target): | |
| 256 """ | |
| 257 Forward this request to the specified target route. | |
| 258 """ | |
| 259 source = bottle.request.environ['PATH_INFO'] | |
| 260 base = source.strip('/').split('/')[:-1] | |
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261 if bottle.request.environ.get(_FTYPE, False): |
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262 raise TinCanError("{0}: forward from error page".format(source)) |
| 0 | 263 try: |
| 264 exc = ForwardException('/' + '/'.join(_normpath(base, target))) | |
| 265 except IndexError as e: | |
| 266 raise TinCanError("{0}: invalid forward to {1!r}".format(source, target)) from e | |
| 267 raise exc | |
| 268 | |
| 2 | 269 # C o d e B e h i n d |
| 270 # | |
| 0 | 271 # Represents the code-behind of one of our pages. This gets subclassed, of |
| 272 # course. | |
| 273 | |
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274 class BasePage(object): |
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275 """ |
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276 The parent class of both error and normal pages' code-behind. |
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277 """ |
| 0 | 278 def handle(self): |
| 279 """ | |
| 280 This is the entry point for the code-behind logic. It is intended | |
| 281 to be overridden. | |
| 282 """ | |
| 283 pass | |
| 284 | |
| 285 def export(self): | |
| 286 """ | |
| 287 Export template variables. The default behavior is to export all | |
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288 non-hidden non-callables that don't start with an underscore. |
| 0 | 289 This method can be overridden if a different behavior is |
| 290 desired. It should always return a dict or dict-like object. | |
| 291 """ | |
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292 ret = { 'page': self } |
| 0 | 293 for name in dir(self): |
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294 if name in self._HIDDEN or name.startswith('_'): |
| 0 | 295 continue |
| 296 value = getattr(self, name) | |
| 297 if callable(value): | |
| 298 continue | |
| 299 ret[name] = value | |
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300 return ret |
| 0 | 301 |
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302 class Page(BasePage): |
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303 """ |
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304 The code-behind for a normal page. |
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305 """ |
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306 # Non-private things we refuse to export anyhow. |
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307 _HIDDEN = set([ "request", "response" ]) |
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308 |
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309 def __init__(self, req, resp): |
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310 """ |
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311 Constructor. This is a lightweight operation. |
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312 """ |
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313 self.request = req # app context is request.app in Bottle |
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314 self.response = resp |
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315 |
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316 class ErrorPage(BasePage): |
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317 """ |
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318 The code-behind for an error page. |
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319 """ |
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320 _HIDDEN = set() |
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321 |
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322 def __init__(self, req, err): |
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323 """ |
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324 Constructor. This is a lightweight operation. |
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325 """ |
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326 self.request = req |
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327 self.error = err |
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328 |
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329 # I n c l u s i o n |
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330 # |
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331 # This is where the #include directives get processed |
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332 |
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333 _IEXTEN = ".pt" |
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334 |
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335 class _Includer(object): |
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336 def __init__(self, base, subdir, name, included=None, encoding="utf-8"): |
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337 self.base = base |
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338 self.subdir = subdir |
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339 self.name = name |
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340 self.included = set() if included is None else included |
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341 self.encoding = encoding |
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342 self._buf = [] |
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343 self._tlib = os.path.join(base, _WINF, "tlib") |
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344 |
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345 def render(self, includes, body): |
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346 for i in includes: |
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347 if i.startswith('<') and i.endswith('>'): |
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348 self._buf.append(self._render1(self._tlib, i[1:-1])) |
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349 else: |
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350 self._buf.append(self._render1(self.subdir, i)) |
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351 self._buf.append(body) |
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352 return ''.join(self._buf) |
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353 |
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354 def _render1(self, subdir, path): |
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355 # Reject bad file names |
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356 if not path.endswith(_IEXTEN) or path.endswith(_PEXTEN): |
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357 raise IncludeError(self.name, "#include files must end with {0} or {1}".format(_IEXTEN, _PEXTEN)) |
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358 # Normalize |
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359 rawpath = _normpath(subdir, path) |
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360 # Only include once |
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361 relpath = '/' + '/'.join(rawpath) |
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362 if relpath in self.included: |
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363 return |
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364 self.included.add(relpath) |
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365 # Do actual inclusion of a file |
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366 npath = os.path.join(self.base, *rawpath) |
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367 nsubdir = rawpath[:-1] |
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368 try: |
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369 tf = TemplateFile(npath) |
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370 except OSError as e: |
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371 raise IncludeError(self.name, str(e)) from e |
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372 try: |
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373 th = TemplateHeader(tf.headers) |
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374 except TemplateHeaderError as e: |
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375 raise IncludeError(npath, str(e)) from e |
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376 # Reject unsupported crap (included files can only #include) |
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377 for i in dir(th): |
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378 if i.startswith('_') or i == 'include': |
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379 continue |
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380 v = getattr(th, i) |
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381 if callable(v): |
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382 continue |
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383 if v is not None and v is not False: |
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384 raise IncludeError(npath, "unsupported #{0}".format(i)) |
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385 # Inclusion is recursive... |
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386 nested = _Includer(self.base, nsubdir, relpath, |
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387 included=self.included, encoding=self.encoding) |
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388 return nested.render(th.includes, tf.body) |
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389 |
| 2 | 390 # R o u t e s |
| 391 # | |
| 0 | 392 # Represents a route in TinCan. Our launcher creates these on-the-fly based |
| 393 # on the files it finds. | |
| 394 | |
| 2 | 395 _ERRMIN = 400 |
| 396 _ERRMAX = 599 | |
| 397 _PEXTEN = ".py" | |
| 398 _TEXTEN = ".pspx" | |
|
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399 _FLOOP = "tincan.forwards" |
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400 _FORIG = "tincan.origin" |
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401 _FTYPE = "tincan.iserror" |
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402 |
|
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403 class _TinCanErrorRoute(object): |
|
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404 """ |
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405 A route to an error page. These don't get routes created for them, |
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406 and are only reached if an error routes them there. Unless you create |
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407 custom code-behind, only two variables are available to your template: |
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408 request (bottle.Request) and error (bottle.HTTPError). |
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409 """ |
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410 def __init__(self, template, klass): |
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411 self._template = template |
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412 self._template.prepare() |
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413 self._class = klass |
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414 |
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415 def __call__(self, e): |
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416 bottle.request.environ[_FTYPE] = True |
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417 try: |
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418 obj = self._class(bottle.request, e) |
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419 obj.handle() |
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420 return self._template.render(obj.export()).lstrip('\n') |
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421 except bottle.HTTPResponse as e: |
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422 return e |
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423 except Exception as e: |
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424 traceback.print_exc() |
|
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425 # Bottle doesn't allow error handlers to themselves cause |
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426 # errors, most likely as a measure to prevent looping. So |
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427 # this will cause a "Critical error while processing request" |
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428 # page to be displayed, and any installed error pages to be |
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429 # ignored. |
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430 raise bottle.HTTPError(status=500, exception=e) |
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431 |
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432 class _TinCanRoute(object): |
| 0 | 433 """ |
| 434 A route created by the TinCan launcher. | |
| 435 """ | |
| 436 def __init__(self, launcher, name, subdir): | |
| 437 self._fsroot = launcher.fsroot | |
| 438 self._urlroot = launcher.urlroot | |
| 439 self._name = name | |
| 2 | 440 self._python = name + _PEXTEN |
| 441 self._fspath = os.path.join(launcher.fsroot, *subdir, name + _TEXTEN) | |
| 442 self._urlpath = self._urljoin(launcher.urlroot, *subdir, name + _TEXTEN) | |
| 0 | 443 self._origin = self._urlpath |
| 444 self._subdir = subdir | |
| 445 self._seen = set() | |
|
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446 self._tclass = launcher.tclass |
| 0 | 447 self._app = launcher.app |
| 448 | |
| 2 | 449 def launch(self): |
| 0 | 450 """ |
| 451 Launch a single page. | |
| 452 """ | |
| 453 # Build master and header objects, process #forward directives | |
|
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454 oheader = None |
| 0 | 455 while True: |
|
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456 try: |
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457 self._template = TemplateFile(self._fspath) |
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458 except IOError as e: |
|
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459 if oheader is not None: |
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460 note = "{0}: invalid #forward: ".format(self._origin) |
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461 else: |
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462 note = "" |
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463 raise TinCanError("{0}{1!s}".format(note, e)) from e |
|
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464 try: |
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465 self._header = TemplateHeader(self._template.header) |
|
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466 except TemplateHeaderError as e: |
|
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467 raise TinCanError("{0}: {1!s}".format(self._fspath, e)) from e |
|
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468 if oheader is None: |
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469 oheader = self._header # save original header |
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470 elif (oheader.errors is None) != (self._header.errors is None): |
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471 raise TinCanError("{0}: invalid #forward".format(self._origin)) |
| 0 | 472 if self._header.forward is None: |
| 473 break | |
|
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474 # print("forwarding from:", self._urlpath) # debug |
| 0 | 475 self._redirect() |
|
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476 # print("forwarded to:", self._urlpath) # debug |
|
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477 # If this is a #hidden page, we ignore it for now, since hidden pages |
| 0 | 478 # don't get routes made for them. |
|
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479 if oheader.hidden and not oheader.errors: |
| 0 | 480 return |
|
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481 # Get the code-behind #python |
|
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482 if self._header.python is None: |
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483 self._python_specified = False |
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484 else: |
| 2 | 485 if not self._header.python.endswith(_PEXTEN): |
|
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486 raise TinCanError("{0}: #python files must end in {1}".format(self._urlpath, _PEXTEN)) |
| 0 | 487 self._python = self._header.python |
|
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488 self._python_specified = True |
| 0 | 489 # Obtain a class object by importing and introspecting a module. |
| 3 | 490 self._getclass() |
|
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491 # Build body object (#template) |
| 3 | 492 if self._header.template is not None: |
| 493 if not self._header.template.endswith(_TEXTEN): | |
|
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494 raise TinCanError("{0}: #template files must end in {1}".format(self._urlpath, _TEXTEN)) |
| 16 | 495 try: |
|
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496 rawpath = self._splitpath(self._header.template) |
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497 tsubdir = rawpath[:-1] |
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498 tpath = os.path.normpath(os.path.join(self._fsroot, *rawpath)) |
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499 turlpath = '/' + self._urljoin(rawpath) |
| 16 | 500 tfile = TemplateFile(tpath) |
|
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501 thead = TemplateHeader(tpath.header) |
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502 except (OSError, TemplateHeaderError) as e: |
| 16 | 503 raise TinCanError("{0}: invalid #template: {1!s}".format(self._urlpath, e)) from e |
| 504 except IndexError as e: | |
| 505 raise TinCanError("{0}: invalid #template".format(self._urlpath)) from e | |
|
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506 includer = _Includer(self._fspath, tsubdir, turlpath) |
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507 try: |
|
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508 self._body = self._tclass(source=includer.render(thead.include, tfile.body)) |
|
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509 except IncludeError as e: |
|
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510 raise TinCanError("{0}: #include error: {1!s}".format(turlpath, e)) from e |
| 3 | 511 else: |
|
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512 includer = _Includer(self._fspath, self._subdir, self._urlpath) |
|
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513 try: |
|
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514 self._body = self._tclass( |
|
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515 source=includer.render(self._header.include, self._template.body)) |
|
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516 except IncludeError as e: |
|
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517 raise TinCanError("{0}: #include error: {1!s}".format(self._urlpath, e)) from e |
|
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Well, *that* attempt at includes didn't work. Revert.
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|
518 self._body.prepare() |
|
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|
519 # If this is an #errors page, register it as such. |
|
11
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Update documentation, fix some #forward bugs.
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|
520 if oheader.errors is not None: |
|
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Update documentation, fix some #forward bugs.
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|
521 self._mkerror(oheader.errors) |
|
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|
522 return # this implies #hidden |
|
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|
523 # Get #methods for this route |
|
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|
524 if self._header.methods is None: |
|
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|
525 methods = [ 'GET' ] |
|
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|
526 else: |
|
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|
527 methods = [ i.upper() for i in self._header.methods.split() ] |
|
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|
528 if not methods: |
|
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|
529 raise TinCanError("{0}: no #methods specified".format(self._urlpath)) |
| 3 | 530 # Register this thing with Bottle |
| 6 | 531 print("adding route:", self._origin, '('+','.join(methods)+')') # debug |
| 3 | 532 self._app.route(self._origin, methods, self) |
| 533 | |
| 534 def _splitpath(self, unsplit): | |
| 535 return _normpath(self._subdir, unsplit) | |
| 536 | |
|
11
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Update documentation, fix some #forward bugs.
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|
537 def _mkerror(self, rerrors): |
| 3 | 538 try: |
|
11
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Update documentation, fix some #forward bugs.
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|
539 errors = [ int(i) for i in rerrors.split() ] |
| 3 | 540 except ValueError as e: |
| 541 raise TinCanError("{0}: bad #errors line".format(self._urlpath)) from e | |
| 542 if not errors: | |
| 543 errors = range(_ERRMIN, _ERRMAX+1) | |
|
23
e8b6ee7e5b6b
Well, *that* attempt at includes didn't work. Revert.
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22
diff
changeset
|
544 route = _TinCanErrorRoute(self._tclass(source=self._template.body), self._class) |
| 3 | 545 for error in errors: |
| 546 if error < _ERRMIN or error > _ERRMAX: | |
| 547 raise TinCanError("{0}: bad #errors code".format(self._urlpath)) | |
| 5 | 548 self._app.error_handler[error] = route # XXX |
| 3 | 549 |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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|
550 def _gettime(self, path): |
|
57ec65f527e9
Eliminate a stat() call, allow no code-behind on pages.
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|
551 try: |
|
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Eliminate a stat() call, allow no code-behind on pages.
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|
552 return os.stat(path).st_mtime |
|
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Eliminate a stat() call, allow no code-behind on pages.
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changeset
|
553 except FileNotFoundError: |
|
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Eliminate a stat() call, allow no code-behind on pages.
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changeset
|
554 return 0 |
| 8 | 555 except OSError as e: |
|
9
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|
556 raise TinCanError(str(e)) from e |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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|
557 |
| 3 | 558 def _getclass(self): |
|
15
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
559 try: |
|
560c8fb55e4a
Fix bugs in #python directive, make code-behind class loading simpler.
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changeset
|
560 pypath = os.path.normpath(os.path.join(self._fsroot, *self._splitpath(self._python))) |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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changeset
|
561 except IndexError as e: |
|
560c8fb55e4a
Fix bugs in #python directive, make code-behind class loading simpler.
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changeset
|
562 raise TinCanError("{0}: invalid #python".format(self._urlpath)) from e |
|
9
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Error pages now can have code-behind.
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|
563 klass = ErrorPage if self._header.errors else Page |
|
7
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|
564 # Give 'em a default code-behind if they don't furnish one |
|
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Eliminate a stat() call, allow no code-behind on pages.
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changeset
|
565 pytime = self._gettime(pypath) |
|
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Eliminate a stat() call, allow no code-behind on pages.
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diff
changeset
|
566 if not pytime: |
|
15
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Fix bugs in #python directive, make code-behind class loading simpler.
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changeset
|
567 if self._python_specified: |
|
560c8fb55e4a
Fix bugs in #python directive, make code-behind class loading simpler.
David Barts <n5jrn@me.com>
parents:
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changeset
|
568 raise TinCanError("{0}: #python file not found".format(self._urlpath)) |
|
9
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Error pages now can have code-behind.
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diff
changeset
|
569 self._class = klass |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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parents:
6
diff
changeset
|
570 return |
|
57ec65f527e9
Eliminate a stat() call, allow no code-behind on pages.
David Barts <n5jrn@me.com>
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diff
changeset
|
571 # Else load the code-behind from a .py file |
| 0 | 572 pycpath = pypath + 'c' |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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6
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|
573 pyctime = self._gettime(pycpath) |
| 0 | 574 try: |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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changeset
|
575 if pyctime < pytime: |
|
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0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
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parents:
3
diff
changeset
|
576 py_compile.compile(pypath, cfile=pycpath, doraise=True) |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
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changeset
|
577 except py_compile.PyCompileError as e: |
|
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Finally got "hello, world" working. Still likely many bugs.
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changeset
|
578 raise TinCanError(str(e)) from e |
|
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Finally got "hello, world" working. Still likely many bugs.
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diff
changeset
|
579 except Exception as e: |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
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3
diff
changeset
|
580 raise TinCanError("{0}: {1!s}".format(pypath, e)) from e |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
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3
diff
changeset
|
581 try: |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
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diff
changeset
|
582 spec = importlib.util.spec_from_file_location(_mangle(self._name), pycpath) |
| 0 | 583 mod = importlib.util.module_from_spec(spec) |
| 584 spec.loader.exec_module(mod) | |
| 585 except Exception as e: | |
| 16 | 586 raise TinCanError("{0}: error importing: {1!s}".format(pycpath, e)) from e |
|
19
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
587 # Locate a suitable class. We look for the "deepest" class object |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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changeset
|
588 # we can find in the inheritance tree. |
| 0 | 589 self._class = None |
|
19
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
590 score = -1 |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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parents:
18
diff
changeset
|
591 ambig = False |
| 0 | 592 for i in dir(mod): |
| 593 v = getattr(mod, i) | |
|
19
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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parents:
18
diff
changeset
|
594 if not isclass(v): |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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18
diff
changeset
|
595 continue |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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18
diff
changeset
|
596 d = self._cldepth(klass, v) |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
597 if d > score: |
|
15
560c8fb55e4a
Fix bugs in #python directive, make code-behind class loading simpler.
David Barts <n5jrn@me.com>
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14
diff
changeset
|
598 self._class = v |
|
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599 score = d |
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600 ambig = False |
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601 elif d == score: |
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602 ambig = True |
| 3 | 603 if self._class is None: |
|
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604 raise TinCanError("{0}: contains no {1} classes".format(pypath, klass.__name__)) |
|
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605 if ambig: |
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606 raise TinCanError("{0}: contains ambiguous {1} classes".format(pypath, klass.__name__)) |
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607 |
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608 # This might fail for complex inheritance schemes from the classes of |
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609 # interest (so don't use them!). |
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610 def _cldepth(self, base, klass, count=0): |
|
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611 if klass is object: |
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612 # not found |
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613 return -1 |
|
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614 elif klass is base: |
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615 # just found |
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616 return count |
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617 else: |
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618 # must recurse |
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619 for c in klass.__bases__: |
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620 result = self._cldepth(base, c, count=count+1) |
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621 if result > 0: |
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622 return result |
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623 return -1 |
| 0 | 624 |
| 625 def _redirect(self): | |
| 626 try: | |
| 627 rlist = self._splitpath(self._header.forward) | |
|
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628 forw = '/' + '/'.join(rlist) |
|
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629 if forw in self._seen: |
|
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630 raise TinCanError("{0}: #forward loop".format(self._origin)) |
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631 self._seen.add(forw) |
| 0 | 632 rname = rlist.pop() |
| 633 except IndexError as e: | |
| 634 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) from e | |
|
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635 name, ext = os.path.splitext(rname) |
| 2 | 636 if ext != _TEXTEN: |
| 0 | 637 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) |
| 638 self._subdir = rlist | |
| 2 | 639 self._python = name + _PEXTEN |
| 0 | 640 self._fspath = os.path.join(self._fsroot, *self._subdir, rname) |
|
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641 self._urlpath = '/' + self._urljoin(*self._subdir, rname) |
| 0 | 642 |
| 643 def _urljoin(self, *args): | |
| 644 args = list(args) | |
| 645 if args[0] == '/': | |
| 646 args[0] = '' | |
| 647 return '/'.join(args) | |
| 648 | |
|
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649 def __call__(self): |
| 0 | 650 """ |
| 651 This gets called by the framework AFTER the page is launched. | |
| 652 """ | |
|
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653 target = None |
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|
654 try: |
|
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655 obj = self._class(bottle.request, bottle.response) |
|
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656 obj.handle() |
|
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657 return self._body.render(obj.export()).lstrip('\n') |
|
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658 except ForwardException as fwd: |
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659 target = fwd.target |
|
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660 except bottle.HTTPResponse as e: |
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661 return e |
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662 except Exception as e: |
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663 traceback.print_exc() |
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664 raise bottle.HTTPError(status=500, exception=e) |
|
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665 if target is None: |
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666 message = "{0}: unexpected null target".format(self._urlpath) |
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667 sys.stderr.write(message + '\n') |
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668 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
|
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669 # We get here if we are doing a server-side programmatic |
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670 # forward. |
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671 environ = bottle.request.environ |
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672 if _FORIG not in environ: |
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673 environ[_FORIG] = self._urlpath |
| 2 | 674 if _FLOOP not in environ: |
| 675 environ[_FLOOP] = set([self._urlpath]) | |
|
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676 elif target in environ[_FLOOP]: |
|
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677 message = "{0}: forward loop detected".format(environ[_FORIG]) |
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678 sys.stderr.write(message + '\n') |
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679 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
|
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680 environ[_FLOOP].add(target) |
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681 environ['bottle.raw_path'] = target |
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682 environ['PATH_INFO'] = urllib.parse.quote(target) |
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683 route, args = self._app.router.match(environ) |
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684 environ['route.handle'] = environ['bottle.route'] = route |
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685 environ['route.url_args'] = args |
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686 return route.call(**args) |
| 0 | 687 |
| 688 def _mkdict(self, obj): | |
| 689 ret = {} | |
| 690 for name in dir(obj): | |
| 691 if name.startswith('_'): | |
| 692 continue | |
| 693 value = getattr(obj, name) | |
| 694 if not callable(value): | |
| 695 ret[name] = value | |
| 696 return ret | |
| 2 | 697 |
| 698 # L a u n c h e r | |
| 699 | |
| 700 _WINF = "WEB-INF" | |
| 701 _BANNED = set([_WINF]) | |
| 702 | |
| 703 class _Launcher(object): | |
| 704 """ | |
| 705 Helper class for launching webapps. | |
| 706 """ | |
|
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|
707 def __init__(self, fsroot, urlroot, tclass, logger): |
| 2 | 708 """ |
| 709 Lightweight constructor. The real action happens in .launch() below. | |
| 710 """ | |
| 711 self.fsroot = fsroot | |
| 712 self.urlroot = urlroot | |
|
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|
713 self.tclass = tclass |
|
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|
714 self.logger = logger |
| 2 | 715 self.app = None |
|
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716 self.errors = 0 |
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|
717 self.debug = False |
| 2 | 718 |
| 719 def launch(self): | |
| 720 """ | |
| 721 Does the actual work of launching something. XXX - modifies sys.path | |
| 722 and never un-modifies it. | |
| 723 """ | |
| 724 # Sanity checks | |
| 725 if not self.urlroot.startswith("/"): | |
|
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726 self.errors = 1 |
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727 self.logger("urlroot not absolute: {0!r}".format(self.urlroot)) |
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728 return self |
| 2 | 729 if not os.path.isdir(self.fsroot): |
|
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730 self.errors = 1 |
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731 self.logger("no such directory: {0!r}".format(self.fsroot)) |
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732 return self |
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733 # Make any needed directories. Refuse to launch things that don't |
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734 # contain WEB-INF, to prevent accidental launches of undesired |
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735 # directory trees containing sensitive files. |
| 2 | 736 winf = os.path.join(self.fsroot, _WINF) |
|
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737 if not os.path.isdir(winf): |
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738 self.errors = 1 |
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739 self.logger("no WEB-INF directory in {0!r}".format(self.fsroot)) |
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740 return self |
| 2 | 741 lib = os.path.join(winf, "lib") |
|
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742 for i in [ lib ]: |
| 2 | 743 if not os.path.isdir(i): |
| 744 os.mkdir(i) | |
| 745 # Add our private lib directory to sys.path | |
| 746 sys.path.insert(1, os.path.abspath(lib)) | |
| 747 # Do what we gotta do | |
| 748 self.app = TinCan() | |
| 749 self._launch([]) | |
|
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750 return self |
| 2 | 751 |
| 752 def _launch(self, subdir): | |
| 753 for entry in os.listdir(os.path.join(self.fsroot, *subdir)): | |
| 754 if not subdir and entry in _BANNED: | |
| 755 continue | |
| 756 etype = os.stat(os.path.join(self.fsroot, *subdir, entry)).st_mode | |
| 757 if S_ISREG(etype): | |
| 758 ename, eext = os.path.splitext(entry) | |
| 759 if eext != _TEXTEN: | |
| 760 continue # only look at interesting files | |
|
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761 route = _TinCanRoute(self, ename, subdir) |
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762 try: |
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763 route.launch() |
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|
764 except TinCanError as e: |
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|
765 self.logger(str(e)) |
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766 if self.debug: |
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767 while e.__cause__ != None: |
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|
768 e = e.__cause__ |
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769 self.logger("\t{0}: {1!s}".format(e.__class__.__name__, e)) |
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770 self.errors += 1 |
| 2 | 771 elif S_ISDIR(etype): |
| 772 self._launch(subdir + [entry]) | |
| 773 | |
|
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774 def _logger(message): |
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|
775 sys.stderr.write(message) |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
776 sys.stderr.write('\n') |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
777 |
|
23
e8b6ee7e5b6b
Well, *that* attempt at includes didn't work. Revert.
David Barts <n5jrn@me.com>
parents:
22
diff
changeset
|
778 def launch(fsroot=None, urlroot='/', tclass=ChameleonTemplate, logger=_logger): |
| 2 | 779 """ |
| 780 Launch and return a TinCan webapp. Does not run the app; it is the | |
| 781 caller's responsibility to call app.run() | |
| 782 """ | |
| 783 if fsroot is None: | |
| 784 fsroot = os.getcwd() | |
|
23
e8b6ee7e5b6b
Well, *that* attempt at includes didn't work. Revert.
David Barts <n5jrn@me.com>
parents:
22
diff
changeset
|
785 launcher = _Launcher(fsroot, urlroot, tclass, logger) |
|
4
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
786 # launcher.debug = True |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
787 launcher.launch() |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
788 return launcher.app, launcher.errors |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
789 |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
790 # XXX - We cannot implement a command-line launcher here; see the |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
791 # launcher script for why. |