Mercurial > cgi-bin > hgweb.cgi > tincan
annotate tincan.py @ 35:41da0b3d2156 draft header-includes
Rename #include to #load (more descriptive).
| author | David Barts <n5jrn@me.com> |
|---|---|
| date | Tue, 28 May 2019 15:49:59 -0700 |
| parents | 0fb455b46e5f |
| children | 4ed261056057 |
| 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 TemplateHeaderError(TinCanException): |
| 0 | 32 """ |
| 33 Raised upon encountering a syntax error in the template headers. | |
| 34 """ | |
| 35 def __init__(self, message, line): | |
| 36 super().__init__(message, line) | |
| 37 self.message = message | |
| 38 self.line = line | |
| 39 | |
| 40 def __str__(self): | |
|
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41 return "line {0}: {1}".format(self.line, self.message) |
| 0 | 42 |
|
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43 class LoadError(TinCanException): |
|
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44 """ |
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45 Raised when we run into problems #load'ing something, usually |
|
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46 because it doesn't exist. |
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47 """ |
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48 def __init__(self, message, source): |
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49 super().__init__(message, source) |
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50 self.message = message |
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51 self.source = source |
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52 |
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53 def __str__(self): |
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54 return "{0}: #load error: {1}".format(self.source, self.message) |
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55 |
| 0 | 56 class ForwardException(TinCanException): |
| 57 """ | |
| 58 Raised to effect the flow control needed to do a forward (server-side | |
| 59 redirect). It is ugly to do this, but other Python frameworks do and | |
| 60 there seems to be no good alternative. | |
| 61 """ | |
| 62 def __init__(self, target): | |
| 63 self.target = target | |
| 64 | |
| 65 class TinCanError(TinCanException): | |
| 66 """ | |
| 67 General-purpose exception thrown by TinCan when things go wrong, often | |
| 68 when attempting to launch webapps. | |
| 69 """ | |
| 70 pass | |
| 71 | |
| 2 | 72 # T e m p l a t e s |
| 73 # | |
| 0 | 74 # Template (.pspx) files. These are standard templates for a supported |
| 75 # template engine, but with an optional set of header lines that begin | |
| 76 # with '#'. | |
| 77 | |
| 78 class TemplateFile(object): | |
| 79 """ | |
| 80 Parse a template file into a header part and the body part. The header | |
| 81 is always a leading set of lines, each starting with '#', that is of the | |
| 82 same format regardless of the template body. The template body varies | |
| 83 depending on the selected templating engine. The body part has | |
| 84 each header line replaced by a blank line. This preserves the overall | |
| 85 line numbering when processing the body. The added newlines are normally | |
| 86 stripped out before the rendered page is sent back to the client. | |
| 87 """ | |
| 5 | 88 _END = "#end" |
| 89 _LEND = len(_END) | |
| 90 _WS = set(whitespace) | |
| 91 | |
| 0 | 92 def __init__(self, raw, encoding='utf-8'): |
| 93 if isinstance(raw, io.TextIOBase): | |
| 94 self._do_init(raw) | |
| 95 elif isinstance(raw, str): | |
| 96 with open(raw, "r", encoding=encoding) as fp: | |
| 97 self._do_init(fp) | |
| 98 else: | |
| 99 raise TypeError("Expecting a string or Text I/O object.") | |
| 100 | |
| 101 def _do_init(self, fp): | |
| 102 self._hbuf = [] | |
| 103 self._bbuf = [] | |
| 104 self._state = self._header | |
| 105 while True: | |
| 106 line = fp.readline() | |
| 107 if line == '': | |
| 108 break | |
| 109 self._state(line) | |
| 110 self.header = ''.join(self._hbuf) | |
| 111 self.body = ''.join(self._bbuf) | |
| 112 | |
| 113 def _header(self, line): | |
| 114 if not line.startswith('#'): | |
| 115 self._state = self._body | |
| 116 self._state(line) | |
| 117 return | |
| 5 | 118 if line.startswith(self._END) and (len(line) == self._LEND or line[self._LEND] in self._WS): |
| 119 self._state = self._body | |
| 0 | 120 self._hbuf.append(line) |
| 121 | |
| 122 def _body(self, line): | |
| 123 self._bbuf.append(line) | |
| 124 | |
| 125 class TemplateHeader(object): | |
| 126 """ | |
| 127 Parses and represents a set of header lines. | |
| 128 """ | |
| 2 | 129 _NAMES = [ "errors", "forward", "methods", "python", "template" ] |
| 0 | 130 _FNAMES = [ "hidden" ] |
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131 _ANAMES = [ "load" ] |
| 0 | 132 |
| 133 def __init__(self, string): | |
| 134 # Initialize our state | |
| 135 for i in self._NAMES: | |
| 136 setattr(self, i, None) | |
| 137 for i in self._FNAMES: | |
| 138 setattr(self, i, False) | |
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139 for i in self._ANAMES: |
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140 setattr(self, i, []) |
| 0 | 141 # Parse the string |
| 142 count = 0 | |
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143 nameset = set(self._NAMES + self._FNAMES + self._ANAMES) |
| 0 | 144 seen = set() |
| 145 lines = string.split("\n") | |
| 146 if lines and lines[-1] == "": | |
| 147 del lines[-1] | |
| 148 for line in lines: | |
| 149 # Get line | |
| 150 count += 1 | |
| 151 if not line.startswith("#"): | |
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152 raise TemplateHeaderError("Does not start with '#'.", count) |
| 0 | 153 try: |
| 154 rna, rpa = line.split(maxsplit=1) | |
| 155 except ValueError: | |
| 5 | 156 rna = line.rstrip() |
| 157 rpa = None | |
| 0 | 158 # Get name, ignoring remarks. |
| 159 name = rna[1:] | |
| 160 if name == "rem": | |
| 161 continue | |
| 5 | 162 if name == "end": |
| 163 break | |
| 0 | 164 if name not in nameset: |
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165 raise TemplateHeaderError("Invalid directive: {0!r}".format(rna), count) |
| 0 | 166 if name in seen: |
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167 raise TemplateHeaderError("Duplicate {0!r} directive.".format(rna), count) |
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168 if name not in self._ANAMES: |
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169 seen.add(name) |
| 0 | 170 # Flags |
| 5 | 171 if name in self._FNAMES: |
| 0 | 172 setattr(self, name, True) |
| 173 continue | |
| 174 # Get parameter | |
| 5 | 175 if rpa is None: |
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176 raise TemplateHeaderError("Missing parameter.", count) |
| 0 | 177 param = rpa.strip() |
| 178 for i in [ "'", '"']: | |
| 179 if param.startswith(i) and param.endswith(i): | |
| 180 param = ast.literal_eval(param) | |
| 181 break | |
| 182 # Update this object | |
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183 if name in self._ANAMES: |
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184 getattr(self, name).append(param) |
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185 else: |
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186 setattr(self, name, param) |
| 0 | 187 |
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188 # C h a m e l e o n |
| 2 | 189 # |
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190 # Support for Chameleon templates (the kind TinCan uses). |
| 0 | 191 |
| 192 class ChameleonTemplate(bottle.BaseTemplate): | |
| 193 def prepare(self, **options): | |
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194 from chameleon import PageTemplate, PageTemplateFile |
| 0 | 195 if self.source: |
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196 self.tpl = PageTemplate(self.source, encoding=self.encoding, |
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197 **options) |
| 0 | 198 else: |
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199 self.tpl = PageTemplateFile(self.filename, encoding=self.encoding, |
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200 search_path=self.lookup, **options) |
| 0 | 201 |
| 202 def render(self, *args, **kwargs): | |
| 203 for dictarg in args: | |
| 204 kwargs.update(dictarg) | |
| 205 _defaults = self.defaults.copy() | |
| 206 _defaults.update(kwargs) | |
| 207 return self.tpl.render(**_defaults) | |
| 208 | |
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209 chameleon_template = functools.partial(bottle.template, template_adapter=ChameleonTemplate) |
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210 chameleon_view = functools.partial(bottle.view, template_adapter=ChameleonTemplate) |
| 0 | 211 |
| 2 | 212 # U t i l i t i e s |
| 0 | 213 |
| 214 def _normpath(base, unsplit): | |
| 215 """ | |
| 216 Split, normalize and ensure a possibly relative path is absolute. First | |
| 217 argument is a list of directory names, defining a base. Second | |
| 218 argument is a string, which may either be relative to that base, or | |
| 219 absolute. Only '/' is supported as a separator. | |
| 220 """ | |
| 221 scratch = unsplit.strip('/').split('/') | |
| 222 if not unsplit.startswith('/'): | |
| 223 scratch = base + scratch | |
| 224 ret = [] | |
| 225 for i in scratch: | |
| 226 if i == '.': | |
| 227 continue | |
| 228 if i == '..': | |
| 229 ret.pop() # may raise IndexError | |
| 230 continue | |
| 231 ret.append(i) | |
| 232 return ret | |
| 233 | |
| 234 def _mangle(string): | |
| 235 """ | |
| 236 Turn a possibly troublesome identifier into a mangled one. | |
| 237 """ | |
| 238 first = True | |
| 239 ret = [] | |
| 240 for ch in string: | |
| 241 if ch == '_' or not (ch if first else "x" + ch).isidentifier(): | |
| 242 ret.append('_') | |
| 243 ret.append(b16encode(ch.encode("utf-8")).decode("us-ascii")) | |
| 244 else: | |
| 245 ret.append(ch) | |
| 246 first = False | |
| 247 return ''.join(ret) | |
| 248 | |
| 249 # The TinCan class. Simply a Bottle webapp that contains a forward method, so | |
| 250 # the code-behind can call request.app.forward(). | |
| 251 | |
| 252 class TinCan(bottle.Bottle): | |
| 253 def forward(self, target): | |
| 254 """ | |
| 255 Forward this request to the specified target route. | |
| 256 """ | |
| 257 source = bottle.request.environ['PATH_INFO'] | |
| 258 base = source.strip('/').split('/')[:-1] | |
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259 if bottle.request.environ.get(_FTYPE, False): |
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260 raise TinCanError("{0}: forward from error page".format(source)) |
| 0 | 261 try: |
| 262 exc = ForwardException('/' + '/'.join(_normpath(base, target))) | |
| 263 except IndexError as e: | |
| 264 raise TinCanError("{0}: invalid forward to {1!r}".format(source, target)) from e | |
| 265 raise exc | |
| 266 | |
| 2 | 267 # C o d e B e h i n d |
| 268 # | |
| 0 | 269 # Represents the code-behind of one of our pages. This gets subclassed, of |
| 270 # course. | |
| 271 | |
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272 class BasePage(object): |
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273 """ |
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274 The parent class of both error and normal pages' code-behind. |
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275 """ |
| 0 | 276 def handle(self): |
| 277 """ | |
| 278 This is the entry point for the code-behind logic. It is intended | |
| 279 to be overridden. | |
| 280 """ | |
| 281 pass | |
| 282 | |
| 283 def export(self): | |
| 284 """ | |
| 285 Export template variables. The default behavior is to export all | |
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286 non-hidden non-callables that don't start with an underscore. |
| 0 | 287 This method can be overridden if a different behavior is |
| 288 desired. It should always return a dict or dict-like object. | |
| 289 """ | |
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290 ret = { 'page': self } |
| 0 | 291 for name in dir(self): |
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292 if name in self._HIDDEN or name.startswith('_'): |
| 0 | 293 continue |
| 294 value = getattr(self, name) | |
| 295 if callable(value): | |
| 296 continue | |
| 297 ret[name] = value | |
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298 return ret |
| 0 | 299 |
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300 class Page(BasePage): |
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301 """ |
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302 The code-behind for a normal page. |
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303 """ |
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304 # Non-private things we refuse to export anyhow. |
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305 _HIDDEN = set([ "request", "response" ]) |
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306 |
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307 def __init__(self, req, resp): |
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308 """ |
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309 Constructor. This is a lightweight operation. |
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310 """ |
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311 self.request = req # app context is request.app in Bottle |
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312 self.response = resp |
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313 |
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314 class ErrorPage(BasePage): |
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315 """ |
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316 The code-behind for an error page. |
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317 """ |
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318 _HIDDEN = set() |
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319 |
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320 def __init__(self, req, err): |
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321 """ |
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322 Constructor. This is a lightweight operation. |
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323 """ |
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324 self.request = req |
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325 self.error = err |
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326 |
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327 # I n c l u s i o n |
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328 # |
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329 # Most processing is in the TinCanRoute class; this just interprets and |
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330 # represents arguments to the #load header directive. |
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331 |
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332 class _LoadedFile(object): |
|
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333 def __init__(self, raw): |
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334 if raw.startswith('<') and raw.endswith('>'): |
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335 raw = raw[1:-1] |
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336 self.in_lib = True |
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337 else: |
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338 self.in_lib = False |
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339 equals = raw.find('=') |
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340 if equals < 0: |
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341 self.vname = os.path.splitext(os.path.basename(raw))[0] |
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342 self.fname = raw |
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343 else: |
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344 self.vname = raw[:equals] |
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345 self.fname = raw[equals+1:] |
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346 if self.vname == "": |
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347 raise ValueError("empty variable name") |
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348 if self.fname == "": |
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349 raise ValueError("empty file name") |
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350 if not self.fname.endswith(_IEXTEN): |
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351 raise ValueError("file does not end in {0}".format(_IEXTEN)) |
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352 |
| 34 | 353 # Using a cache is likely to help efficiency a lot, since many pages |
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354 # will typically #load the same standard stuff. |
| 34 | 355 _tcache = {} |
| 356 def _get_template(name, direct): | |
| 357 aname = os.path.abspath(os.path.join(direct, name)) | |
| 358 if aname not in _tcache: | |
| 359 tmpl = ChameleonTemplate(name=name, lookup=[direct]) | |
| 360 tmpl.prepare() | |
| 361 assert aname == tmpl.filename | |
| 362 _tcache[aname] = tmpl | |
| 363 return _tcache[aname] | |
| 364 | |
| 2 | 365 # R o u t e s |
| 366 # | |
| 0 | 367 # Represents a route in TinCan. Our launcher creates these on-the-fly based |
| 368 # on the files it finds. | |
| 369 | |
| 2 | 370 _ERRMIN = 400 |
| 371 _ERRMAX = 599 | |
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372 _IEXTEN = ".pt" |
| 2 | 373 _PEXTEN = ".py" |
| 374 _TEXTEN = ".pspx" | |
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375 _FLOOP = "tincan.forwards" |
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376 _FORIG = "tincan.origin" |
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377 _FTYPE = "tincan.iserror" |
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378 |
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379 class _TinCanErrorRoute(object): |
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380 """ |
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381 A route to an error page. These don't get routes created for them, |
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382 and are only reached if an error routes them there. Unless you create |
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383 custom code-behind, only two variables are available to your template: |
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384 request (bottle.Request) and error (bottle.HTTPError). |
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385 """ |
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386 def __init__(self, template, loads, klass): |
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387 self._template = template |
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388 self._template.prepare() |
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389 self._loads = loads |
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390 self._class = klass |
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391 |
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392 def __call__(self, e): |
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393 bottle.request.environ[_FTYPE] = True |
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394 try: |
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395 obj = self._class(bottle.request, e) |
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396 obj.handle() |
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397 tvars = self._loads.copy() |
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398 tvars.update(obj.export()) |
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399 return self._template.render(tvars) |
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400 except bottle.HTTPResponse as e: |
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401 return e |
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402 except Exception as e: |
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403 traceback.print_exc() |
|
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404 # Bottle doesn't allow error handlers to themselves cause |
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405 # errors, most likely as a measure to prevent looping. So |
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406 # this will cause a "Critical error while processing request" |
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407 # page to be displayed, and any installed error pages to be |
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408 # ignored. |
|
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409 raise bottle.HTTPError(status=500, exception=e) |
|
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410 |
|
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411 class _TinCanRoute(object): |
| 0 | 412 """ |
| 413 A route created by the TinCan launcher. | |
| 414 """ | |
| 415 def __init__(self, launcher, name, subdir): | |
| 416 self._fsroot = launcher.fsroot | |
| 417 self._urlroot = launcher.urlroot | |
| 418 self._name = name | |
| 2 | 419 self._python = name + _PEXTEN |
| 420 self._fspath = os.path.join(launcher.fsroot, *subdir, name + _TEXTEN) | |
| 421 self._urlpath = self._urljoin(launcher.urlroot, *subdir, name + _TEXTEN) | |
| 0 | 422 self._origin = self._urlpath |
| 423 self._subdir = subdir | |
| 424 self._seen = set() | |
| 425 self._app = launcher.app | |
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426 self._save_loads = launcher.debug |
| 0 | 427 |
| 2 | 428 def launch(self): |
| 0 | 429 """ |
| 430 Launch a single page. | |
| 431 """ | |
| 432 # Build master and header objects, process #forward directives | |
|
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433 oheader = None |
| 0 | 434 while True: |
|
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435 try: |
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436 self._template = TemplateFile(self._fspath) |
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437 except IOError as e: |
|
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438 if oheader is not None: |
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439 note = "{0}: invalid #forward: ".format(self._origin) |
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440 else: |
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441 note = "" |
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442 raise TinCanError("{0}{1!s}".format(note, e)) from e |
|
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443 try: |
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444 self._header = TemplateHeader(self._template.header) |
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445 except TemplateHeaderError as e: |
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446 raise TinCanError("{0}: {1!s}".format(self._fspath, e)) from e |
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447 if oheader is None: |
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448 oheader = self._header # save original header |
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449 elif (oheader.errors is None) != (self._header.errors is None): |
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450 raise TinCanError("{0}: invalid #forward".format(self._origin)) |
| 0 | 451 if self._header.forward is None: |
| 452 break | |
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453 # print("forwarding from:", self._urlpath) # debug |
| 0 | 454 self._redirect() |
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455 # print("forwarded to:", self._urlpath) # debug |
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456 # If this is a #hidden page, we ignore it for now, since hidden pages |
| 0 | 457 # don't get routes made for them. |
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458 if oheader.hidden and not oheader.errors: |
| 0 | 459 return |
|
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460 # Get the code-behind #python |
|
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461 if self._header.python is None: |
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462 self._python_specified = False |
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463 else: |
| 2 | 464 if not self._header.python.endswith(_PEXTEN): |
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465 raise TinCanError("{0}: #python files must end in {1}".format(self._urlpath, _PEXTEN)) |
| 0 | 466 self._python = self._header.python |
|
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467 self._python_specified = True |
| 0 | 468 # Obtain a class object by importing and introspecting a module. |
| 3 | 469 self._getclass() |
|
35
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470 # Build body object (#template) and obtain #loads. |
| 3 | 471 if self._header.template is not None: |
| 472 if not self._header.template.endswith(_TEXTEN): | |
|
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473 raise TinCanError("{0}: #template files must end in {1}".format(self._urlpath, _TEXTEN)) |
| 16 | 474 try: |
|
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475 rtpath = self._splitpath(self._header.template) |
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476 tpath = os.path.normpath(os.path.join(self._fsroot, *rtpath)) |
| 16 | 477 tfile = TemplateFile(tpath) |
|
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478 except OSError as e: |
| 16 | 479 raise TinCanError("{0}: invalid #template: {1!s}".format(self._urlpath, e)) from e |
| 480 except IndexError as e: | |
| 481 raise TinCanError("{0}: invalid #template".format(self._urlpath)) from e | |
| 32 | 482 self._body = ChameleonTemplate(source=tfile.body) |
| 3 | 483 else: |
| 32 | 484 self._body = ChameleonTemplate(source=self._template.body) |
|
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485 self._body.prepare() |
|
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486 # Process loads |
|
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487 self._loads = {} |
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Rename #include to #load (more descriptive).
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488 for load in self._header.load: |
|
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489 try: |
|
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490 load = _LoadedFile(load) |
|
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491 except ValueError as e: |
|
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492 raise TinCanError("{0}: bad #load: {1!s}".format(self._urlpath, e)) from e |
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493 if load.in_lib: |
|
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494 fdir = os.path.join(self._fsroot, _WINF, "tlib") |
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495 else: |
| 32 | 496 fdir = os.path.join(self._fsroot, *self._subdir) |
|
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497 try: |
|
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498 tmpl = _get_template(load.fname, fdir) |
|
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499 except Exception as e: |
|
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500 raise TinCanError("{0}: bad #load: {1!s}".format(self._urlpath, e)) from e |
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501 self._loads[load.vname] = tmpl.tpl |
|
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502 # If this is an #errors page, register it as such. |
|
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503 if oheader.errors is not None: |
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504 self._mkerror(oheader.errors) |
|
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505 return # this implies #hidden |
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506 # Get #methods for this route |
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507 if self._header.methods is None: |
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508 methods = [ 'GET' ] |
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509 else: |
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510 methods = [ i.upper() for i in self._header.methods.split() ] |
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511 if not methods: |
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512 raise TinCanError("{0}: no #methods specified".format(self._urlpath)) |
| 3 | 513 # Register this thing with Bottle |
| 6 | 514 print("adding route:", self._origin, '('+','.join(methods)+')') # debug |
| 3 | 515 self._app.route(self._origin, methods, self) |
| 516 | |
| 517 def _splitpath(self, unsplit): | |
| 518 return _normpath(self._subdir, unsplit) | |
| 519 | |
|
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520 def _mkerror(self, rerrors): |
| 3 | 521 try: |
|
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522 errors = [ int(i) for i in rerrors.split() ] |
| 3 | 523 except ValueError as e: |
| 524 raise TinCanError("{0}: bad #errors line".format(self._urlpath)) from e | |
| 525 if not errors: | |
| 526 errors = range(_ERRMIN, _ERRMAX+1) | |
| 32 | 527 route = _TinCanErrorRoute(ChameleonTemplate(source=self._template.body), |
|
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528 self._loads, self._class) |
| 3 | 529 for error in errors: |
| 530 if error < _ERRMIN or error > _ERRMAX: | |
| 531 raise TinCanError("{0}: bad #errors code".format(self._urlpath)) | |
| 5 | 532 self._app.error_handler[error] = route # XXX |
| 3 | 533 |
|
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534 def _gettime(self, path): |
|
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535 try: |
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536 return os.stat(path).st_mtime |
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537 except FileNotFoundError: |
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538 return 0 |
| 8 | 539 except OSError as e: |
|
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540 raise TinCanError(str(e)) from e |
|
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541 |
| 3 | 542 def _getclass(self): |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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543 try: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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544 pypath = os.path.normpath(os.path.join(self._fsroot, *self._splitpath(self._python))) |
|
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545 except IndexError as e: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
546 raise TinCanError("{0}: invalid #python".format(self._urlpath)) from e |
|
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547 klass = ErrorPage if self._header.errors else Page |
|
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|
548 # 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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|
549 pytime = self._gettime(pypath) |
|
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550 if not pytime: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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551 if self._python_specified: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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552 raise TinCanError("{0}: #python file not found".format(self._urlpath)) |
|
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553 self._class = klass |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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|
554 return |
|
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Eliminate a stat() call, allow no code-behind on pages.
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|
555 # Else load the code-behind from a .py file |
| 0 | 556 pycpath = pypath + 'c' |
|
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Eliminate a stat() call, allow no code-behind on pages.
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557 pyctime = self._gettime(pycpath) |
| 0 | 558 try: |
|
7
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|
559 if pyctime < pytime: |
|
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0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
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|
560 py_compile.compile(pypath, cfile=pycpath, doraise=True) |
|
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|
561 except py_compile.PyCompileError as e: |
|
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|
562 raise TinCanError(str(e)) from e |
|
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Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
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|
563 except Exception as e: |
|
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Finally got "hello, world" working. Still likely many bugs.
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|
564 raise TinCanError("{0}: {1!s}".format(pypath, e)) from e |
|
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Finally got "hello, world" working. Still likely many bugs.
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parents:
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diff
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|
565 try: |
|
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Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
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diff
changeset
|
566 spec = importlib.util.spec_from_file_location(_mangle(self._name), pycpath) |
| 0 | 567 mod = importlib.util.module_from_spec(spec) |
| 568 spec.loader.exec_module(mod) | |
| 569 except Exception as e: | |
| 16 | 570 raise TinCanError("{0}: error importing: {1!s}".format(pycpath, e)) from e |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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571 # Locate a suitable class. We look for the "deepest" class object |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
572 # we can find in the inheritance tree. |
| 0 | 573 self._class = None |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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574 score = -1 |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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|
575 ambig = False |
| 0 | 576 for i in dir(mod): |
| 577 v = getattr(mod, i) | |
|
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578 if not isclass(v): |
|
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|
579 continue |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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|
580 d = self._cldepth(klass, v) |
|
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|
581 if d > score: |
|
15
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Fix bugs in #python directive, make code-behind class loading simpler.
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582 self._class = v |
|
19
5d9a1b82251a
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583 score = d |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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584 ambig = False |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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585 elif d == score: |
|
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586 ambig = True |
| 3 | 587 if self._class is None: |
|
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588 raise TinCanError("{0}: contains no {1} classes".format(pypath, klass.__name__)) |
|
19
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|
589 if ambig: |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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changeset
|
590 raise TinCanError("{0}: contains ambiguous {1} classes".format(pypath, klass.__name__)) |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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|
591 |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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|
592 # This might fail for complex inheritance schemes from the classes of |
|
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diff
changeset
|
593 # interest (so don't use them!). |
|
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|
594 def _cldepth(self, base, klass, count=0): |
|
5d9a1b82251a
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diff
changeset
|
595 if klass is object: |
|
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18
diff
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|
596 # not found |
|
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|
597 return -1 |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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|
598 elif klass is base: |
|
5d9a1b82251a
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diff
changeset
|
599 # just found |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
600 return count |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
601 else: |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
602 # must recurse |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
603 for c in klass.__bases__: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
604 result = self._cldepth(base, c, count=count+1) |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
changeset
|
605 if result > 0: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
606 return result |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
607 return -1 |
| 0 | 608 |
| 609 def _redirect(self): | |
| 610 try: | |
| 611 rlist = self._splitpath(self._header.forward) | |
|
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612 forw = '/' + '/'.join(rlist) |
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613 if forw in self._seen: |
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614 raise TinCanError("{0}: #forward loop".format(self._origin)) |
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615 self._seen.add(forw) |
| 0 | 616 rname = rlist.pop() |
| 617 except IndexError as e: | |
| 618 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) from e | |
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619 name, ext = os.path.splitext(rname) |
| 2 | 620 if ext != _TEXTEN: |
| 0 | 621 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) |
| 622 self._subdir = rlist | |
| 2 | 623 self._python = name + _PEXTEN |
| 0 | 624 self._fspath = os.path.join(self._fsroot, *self._subdir, rname) |
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625 self._urlpath = '/' + self._urljoin(*self._subdir, rname) |
| 0 | 626 |
| 627 def _urljoin(self, *args): | |
| 628 args = list(args) | |
| 629 if args[0] == '/': | |
| 630 args[0] = '' | |
| 631 return '/'.join(args) | |
| 632 | |
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633 def __call__(self): |
| 0 | 634 """ |
| 635 This gets called by the framework AFTER the page is launched. | |
| 636 """ | |
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637 target = None |
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638 try: |
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639 obj = self._class(bottle.request, bottle.response) |
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640 obj.handle() |
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641 tvars = self._loads.copy() |
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642 tvars.update(obj.export()) |
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643 return self._body.render(tvars) |
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644 except ForwardException as fwd: |
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645 target = fwd.target |
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646 except bottle.HTTPResponse as e: |
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647 return e |
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648 except Exception as e: |
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649 traceback.print_exc() |
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650 raise bottle.HTTPError(status=500, exception=e) |
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651 if target is None: |
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652 message = "{0}: unexpected null target".format(self._urlpath) |
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653 sys.stderr.write(message + '\n') |
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654 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
|
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655 # We get here if we are doing a server-side programmatic |
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656 # forward. |
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657 environ = bottle.request.environ |
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658 if _FORIG not in environ: |
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659 environ[_FORIG] = self._urlpath |
| 2 | 660 if _FLOOP not in environ: |
| 661 environ[_FLOOP] = set([self._urlpath]) | |
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662 elif target in environ[_FLOOP]: |
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663 message = "{0}: forward loop detected".format(environ[_FORIG]) |
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664 sys.stderr.write(message + '\n') |
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665 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
|
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666 environ[_FLOOP].add(target) |
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667 environ['bottle.raw_path'] = target |
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668 environ['PATH_INFO'] = urllib.parse.quote(target) |
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669 route, args = self._app.router.match(environ) |
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670 environ['route.handle'] = environ['bottle.route'] = route |
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671 environ['route.url_args'] = args |
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672 return route.call(**args) |
| 0 | 673 |
| 2 | 674 # L a u n c h e r |
| 675 | |
| 676 _WINF = "WEB-INF" | |
| 677 _BANNED = set([_WINF]) | |
| 678 | |
| 679 class _Launcher(object): | |
| 680 """ | |
| 681 Helper class for launching webapps. | |
| 682 """ | |
| 32 | 683 def __init__(self, fsroot, urlroot, logger): |
| 2 | 684 """ |
| 685 Lightweight constructor. The real action happens in .launch() below. | |
| 686 """ | |
| 687 self.fsroot = fsroot | |
| 688 self.urlroot = urlroot | |
|
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689 self.logger = logger |
| 2 | 690 self.app = None |
|
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691 self.errors = 0 |
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692 self.debug = False |
| 2 | 693 |
| 694 def launch(self): | |
| 695 """ | |
| 696 Does the actual work of launching something. XXX - modifies sys.path | |
| 697 and never un-modifies it. | |
| 698 """ | |
| 699 # Sanity checks | |
| 700 if not self.urlroot.startswith("/"): | |
|
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701 self.errors = 1 |
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702 self.logger("urlroot not absolute: {0!r}".format(self.urlroot)) |
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703 return self |
| 2 | 704 if not os.path.isdir(self.fsroot): |
|
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705 self.errors = 1 |
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706 self.logger("no such directory: {0!r}".format(self.fsroot)) |
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707 return self |
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708 # Make any needed directories. Refuse to launch things that don't |
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709 # contain WEB-INF, to prevent accidental launches of undesired |
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710 # directory trees containing sensitive files. |
| 2 | 711 winf = os.path.join(self.fsroot, _WINF) |
|
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712 if not os.path.isdir(winf): |
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713 self.errors = 1 |
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714 self.logger("no WEB-INF directory in {0!r}".format(self.fsroot)) |
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715 return self |
| 2 | 716 lib = os.path.join(winf, "lib") |
|
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717 for i in [ lib ]: |
| 2 | 718 if not os.path.isdir(i): |
| 719 os.mkdir(i) | |
| 720 # Add our private lib directory to sys.path | |
| 721 sys.path.insert(1, os.path.abspath(lib)) | |
| 722 # Do what we gotta do | |
| 723 self.app = TinCan() | |
| 724 self._launch([]) | |
|
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725 return self |
| 2 | 726 |
| 727 def _launch(self, subdir): | |
| 728 for entry in os.listdir(os.path.join(self.fsroot, *subdir)): | |
| 729 if not subdir and entry in _BANNED: | |
| 730 continue | |
| 731 etype = os.stat(os.path.join(self.fsroot, *subdir, entry)).st_mode | |
| 732 if S_ISREG(etype): | |
| 733 ename, eext = os.path.splitext(entry) | |
| 734 if eext != _TEXTEN: | |
| 735 continue # only look at interesting files | |
|
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736 route = _TinCanRoute(self, ename, subdir) |
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737 try: |
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738 route.launch() |
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739 except TinCanError as e: |
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740 self.logger(str(e)) |
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741 if self.debug: |
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742 while e.__cause__ != None: |
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743 e = e.__cause__ |
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744 self.logger("\t{0}: {1!s}".format(e.__class__.__name__, e)) |
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745 self.errors += 1 |
| 2 | 746 elif S_ISDIR(etype): |
| 747 self._launch(subdir + [entry]) | |
| 748 | |
|
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|
749 def _logger(message): |
|
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750 sys.stderr.write(message) |
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751 sys.stderr.write('\n') |
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752 |
| 32 | 753 def launch(fsroot=None, urlroot='/', logger=_logger, debug=False): |
| 2 | 754 """ |
| 755 Launch and return a TinCan webapp. Does not run the app; it is the | |
| 756 caller's responsibility to call app.run() | |
| 757 """ | |
| 758 if fsroot is None: | |
| 759 fsroot = os.getcwd() | |
| 32 | 760 launcher = _Launcher(fsroot, urlroot, logger) |
|
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|
761 launcher.debug = debug |
|
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|
762 launcher.launch() |
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763 return launcher.app, launcher.errors |
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|
764 |
|
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765 # XXX - We cannot implement a command-line launcher here; see the |
|
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|
766 # launcher script for why. |