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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
23 | #include "sigrokdecode-internal.h" | |
24 | #include <glib.h> | |
25 | ||
26 | /* The list of protocol decoders. */ | |
27 | SRD_PRIV GSList *pd_list = NULL; | |
28 | ||
29 | /* module_sigrokdecode.c */ | |
30 | extern SRD_PRIV PyObject *mod_sigrokdecode; | |
31 | ||
32 | /** | |
33 | * Returns the list of supported/loaded protocol decoders. | |
34 | * | |
35 | * This is a GSList containing the names of the decoders as strings. | |
36 | * | |
37 | * @return List of decoders, NULL if none are supported or loaded. | |
38 | */ | |
39 | SRD_API GSList *srd_list_decoders(void) | |
40 | { | |
41 | return pd_list; | |
42 | } | |
43 | ||
44 | /** | |
45 | * Get the decoder with the specified ID. | |
46 | * | |
47 | * @param id The ID string of the decoder to return. | |
48 | * | |
49 | * @return The decoder with the specified ID, or NULL if not found. | |
50 | */ | |
51 | SRD_API struct srd_decoder *srd_get_decoder_by_id(const char *id) | |
52 | { | |
53 | GSList *l; | |
54 | struct srd_decoder *dec; | |
55 | ||
56 | for (l = srd_list_decoders(); l; l = l->next) { | |
57 | dec = l->data; | |
58 | if (!strcmp(dec->id, id)) | |
59 | return dec; | |
60 | } | |
61 | ||
62 | return NULL; | |
63 | } | |
64 | ||
65 | static int get_probes(struct srd_decoder *d, char *attr, GSList **pl) | |
66 | { | |
67 | PyObject *py_probelist, *py_entry; | |
68 | struct srd_probe *p; | |
69 | int ret, num_probes, i; | |
70 | ||
71 | if (!PyObject_HasAttrString(d->py_dec, attr)) | |
72 | /* No probes of this type specified. */ | |
73 | return SRD_OK; | |
74 | ||
75 | ret = SRD_ERR_PYTHON; | |
76 | py_probelist = py_entry = NULL; | |
77 | ||
78 | py_probelist = PyObject_GetAttrString(d->py_dec, attr); | |
79 | if (!PyList_Check(py_probelist)) { | |
80 | srd_err("Protocol decoder %s %s attribute is not " | |
81 | "a list.", d->name, attr); | |
82 | goto err_out; | |
83 | } | |
84 | ||
85 | num_probes = PyList_Size(py_probelist); | |
86 | if (num_probes == 0) | |
87 | /* Empty probelist. */ | |
88 | return SRD_OK; | |
89 | ||
90 | for (i = 0; i < num_probes; i++) { | |
91 | py_entry = PyList_GetItem(py_probelist, i); | |
92 | if (!PyDict_Check(py_entry)) { | |
93 | srd_err("Protocol decoder %s %s attribute is not " | |
94 | "a list with dict elements.", d->name, attr); | |
95 | goto err_out; | |
96 | } | |
97 | ||
98 | if (!(p = g_try_malloc(sizeof(struct srd_probe)))) { | |
99 | srd_err("Failed to g_malloc() struct srd_probe."); | |
100 | ret = SRD_ERR_MALLOC; | |
101 | goto err_out; | |
102 | } | |
103 | ||
104 | if ((py_dictitem_as_str(py_entry, "id", &p->id)) != SRD_OK) | |
105 | goto err_out; | |
106 | if ((py_dictitem_as_str(py_entry, "name", &p->name)) != SRD_OK) | |
107 | goto err_out; | |
108 | if ((py_dictitem_as_str(py_entry, "desc", &p->desc)) != SRD_OK) | |
109 | goto err_out; | |
110 | p->order = i; | |
111 | ||
112 | *pl = g_slist_append(*pl, p); | |
113 | } | |
114 | ret = SRD_OK; | |
115 | ||
116 | err_out: | |
117 | Py_DecRef(py_entry); | |
118 | Py_DecRef(py_probelist); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | /** | |
124 | * Load a protocol decoder module into the embedded Python interpreter. | |
125 | * | |
126 | * @param name The module name to be loaded. | |
127 | * | |
128 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
129 | */ | |
130 | SRD_API int srd_load_decoder(const char *module_name) | |
131 | { | |
132 | PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann; | |
133 | struct srd_decoder *d; | |
134 | int alen, ret, i; | |
135 | char **ann; | |
136 | ||
137 | srd_dbg("Loading module '%s'.", module_name); | |
138 | ||
139 | py_basedec = py_method = py_attr = NULL; | |
140 | ||
141 | if (!(d = g_try_malloc0(sizeof(struct srd_decoder)))) { | |
142 | srd_dbg("Failed to g_malloc() struct srd_decoder."); | |
143 | ret = SRD_ERR_MALLOC; | |
144 | goto err_out; | |
145 | } | |
146 | ||
147 | ret = SRD_ERR_PYTHON; | |
148 | ||
149 | /* Import the Python module. */ | |
150 | if (!(d->py_mod = PyImport_ImportModule(module_name))) { | |
151 | catch_exception("import of '%s' failed.", module_name); | |
152 | goto err_out; | |
153 | } | |
154 | ||
155 | /* Get the 'Decoder' class as Python object. */ | |
156 | if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) { | |
157 | /* This generated an AttributeError exception. */ | |
158 | PyErr_Clear(); | |
159 | srd_err("Decoder class not found in protocol decoder %s.", module_name); | |
160 | goto err_out; | |
161 | } | |
162 | ||
163 | if (!(py_basedec = PyObject_GetAttrString(mod_sigrokdecode, "Decoder"))) { | |
164 | srd_dbg("sigrokdecode module not loaded."); | |
165 | goto err_out; | |
166 | } | |
167 | ||
168 | if (!PyObject_IsSubclass(d->py_dec, py_basedec)) { | |
169 | srd_err("Decoder class in protocol decoder module %s is not " | |
170 | "a subclass of sigrokdecode.Decoder.", module_name); | |
171 | goto err_out; | |
172 | } | |
173 | Py_CLEAR(py_basedec); | |
174 | ||
175 | /* Check for a proper start() method. */ | |
176 | if (!PyObject_HasAttrString(d->py_dec, "start")) { | |
177 | srd_err("Protocol decoder %s has no start() method Decoder " | |
178 | "class.", module_name); | |
179 | goto err_out; | |
180 | } | |
181 | py_method = PyObject_GetAttrString(d->py_dec, "start"); | |
182 | if (!PyFunction_Check(py_method)) { | |
183 | srd_err("Protocol decoder %s Decoder class attribute 'start' " | |
184 | "is not a method.", module_name); | |
185 | goto err_out; | |
186 | } | |
187 | Py_CLEAR(py_method); | |
188 | ||
189 | /* Check for a proper decode() method. */ | |
190 | if (!PyObject_HasAttrString(d->py_dec, "decode")) { | |
191 | srd_err("Protocol decoder %s has no decode() method Decoder " | |
192 | "class.", module_name); | |
193 | goto err_out; | |
194 | } | |
195 | py_method = PyObject_GetAttrString(d->py_dec, "decode"); | |
196 | if (!PyFunction_Check(py_method)) { | |
197 | srd_err("Protocol decoder %s Decoder class attribute 'decode' " | |
198 | "is not a method.", module_name); | |
199 | goto err_out; | |
200 | } | |
201 | Py_CLEAR(py_method); | |
202 | ||
203 | /* If present, options must be a dictionary. */ | |
204 | if (PyObject_HasAttrString(d->py_dec, "options")) { | |
205 | py_attr = PyObject_GetAttrString(d->py_dec, "options"); | |
206 | if (!PyDict_Check(py_attr)) { | |
207 | srd_err("Protocol decoder %s options attribute is not " | |
208 | "a dictionary.", d->name); | |
209 | Py_DecRef(py_attr); | |
210 | goto err_out; | |
211 | } | |
212 | Py_DecRef(py_attr); | |
213 | } | |
214 | ||
215 | /* Check and import required probes. */ | |
216 | if (get_probes(d, "probes", &d->probes) != SRD_OK) | |
217 | goto err_out; | |
218 | ||
219 | /* Check and import optional probes. */ | |
220 | if (get_probes(d, "optional_probes", &d->opt_probes) != SRD_OK) | |
221 | goto err_out; | |
222 | ||
223 | /* Store required fields in newly allocated strings. */ | |
224 | if (py_attr_as_str(d->py_dec, "id", &(d->id)) != SRD_OK) | |
225 | goto err_out; | |
226 | ||
227 | if (py_attr_as_str(d->py_dec, "name", &(d->name)) != SRD_OK) | |
228 | goto err_out; | |
229 | ||
230 | if (py_attr_as_str(d->py_dec, "longname", &(d->longname)) != SRD_OK) | |
231 | goto err_out; | |
232 | ||
233 | if (py_attr_as_str(d->py_dec, "desc", &(d->desc)) != SRD_OK) | |
234 | goto err_out; | |
235 | ||
236 | if (py_attr_as_str(d->py_dec, "license", &(d->license)) != SRD_OK) | |
237 | goto err_out; | |
238 | ||
239 | /* TODO: Handle inputformats, outputformats. */ | |
240 | d->inputformats = NULL; | |
241 | d->outputformats = NULL; | |
242 | ||
243 | /* Convert class annotation attribute to GSList of **char */ | |
244 | d->annotations = NULL; | |
245 | if (PyObject_HasAttrString(d->py_dec, "annotations")) { | |
246 | py_annlist = PyObject_GetAttrString(d->py_dec, "annotations"); | |
247 | if (!PyList_Check(py_annlist)) { | |
248 | srd_err("Protocol decoder module %s annotations " | |
249 | "should be a list.", module_name); | |
250 | goto err_out; | |
251 | } | |
252 | alen = PyList_Size(py_annlist); | |
253 | for (i = 0; i < alen; i++) { | |
254 | py_ann = PyList_GetItem(py_annlist, i); | |
255 | if (!PyList_Check(py_ann) || PyList_Size(py_ann) != 2) { | |
256 | srd_err("Protocol decoder module %s " | |
257 | "annotation %d should be a list with " | |
258 | "two elements.", module_name, i + 1); | |
259 | goto err_out; | |
260 | } | |
261 | ||
262 | if (py_strlist_to_char(py_ann, &ann) != SRD_OK) { | |
263 | goto err_out; | |
264 | } | |
265 | d->annotations = g_slist_append(d->annotations, ann); | |
266 | } | |
267 | } | |
268 | ||
269 | /* Append it to the list of supported/loaded decoders. */ | |
270 | pd_list = g_slist_append(pd_list, d); | |
271 | ||
272 | ret = SRD_OK; | |
273 | ||
274 | err_out: | |
275 | if (ret != SRD_OK) { | |
276 | Py_XDECREF(py_method); | |
277 | Py_XDECREF(py_basedec); | |
278 | Py_XDECREF(d->py_dec); | |
279 | Py_XDECREF(d->py_mod); | |
280 | g_free(d); | |
281 | } | |
282 | ||
283 | return ret; | |
284 | } | |
285 | ||
286 | /** | |
287 | * Return a protocol decoder's docstring. | |
288 | * | |
289 | * @param dec The loaded protocol decoder. | |
290 | * | |
291 | * @return A newly allocated buffer containing the docstring. The caller should | |
292 | * free this after use. | |
293 | */ | |
294 | SRD_API char *srd_decoder_doc(struct srd_decoder *dec) | |
295 | { | |
296 | PyObject *py_str; | |
297 | char *doc; | |
298 | ||
299 | if (!PyObject_HasAttrString(dec->py_mod, "__doc__")) | |
300 | return NULL; | |
301 | ||
302 | if (!(py_str = PyObject_GetAttrString(dec->py_mod, "__doc__"))) { | |
303 | catch_exception(""); | |
304 | return NULL; | |
305 | } | |
306 | ||
307 | doc = NULL; | |
308 | if (py_str != Py_None) | |
309 | py_str_as_str(py_str, &doc); | |
310 | Py_DecRef(py_str); | |
311 | ||
312 | return doc; | |
313 | } | |
314 | ||
315 | static void free_probes(GSList *probelist) | |
316 | { | |
317 | GSList *l; | |
318 | struct srd_probe *p; | |
319 | ||
320 | if (probelist == NULL) | |
321 | return; | |
322 | ||
323 | for (l = probelist; l; l = l->next) { | |
324 | p = l->data; | |
325 | g_free(p->id); | |
326 | g_free(p->name); | |
327 | g_free(p->desc); | |
328 | g_free(p); | |
329 | } | |
330 | g_slist_free(probelist); | |
331 | ||
332 | } | |
333 | ||
334 | /** | |
335 | * Unload decoder module. | |
336 | * | |
337 | * @param dec The struct srd_decoder to be unloaded. | |
338 | * | |
339 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
340 | */ | |
341 | SRD_API int srd_unload_decoder(struct srd_decoder *dec) | |
342 | { | |
343 | srd_dbg("unloading decoder %s", dec->name); | |
344 | ||
345 | /* Since any instances of this decoder need to be released as well, | |
346 | * but they could be anywhere in the stack, just free the entire | |
347 | * stack. A frontend reloading a decoder thus has to restart all | |
348 | * instances, and rebuild the stack. */ | |
349 | srd_inst_free_all(NULL); | |
350 | ||
351 | free_probes(dec->probes); | |
352 | free_probes(dec->opt_probes); | |
353 | g_free(dec->id); | |
354 | g_free(dec->name); | |
355 | g_free(dec->longname); | |
356 | g_free(dec->desc); | |
357 | g_free(dec->license); | |
358 | ||
359 | /* TODO: Free everything in inputformats and outputformats. */ | |
360 | if (dec->inputformats != NULL) | |
361 | g_slist_free(dec->inputformats); | |
362 | if (dec->outputformats != NULL) | |
363 | g_slist_free(dec->outputformats); | |
364 | ||
365 | /* The module's Decoder class. */ | |
366 | Py_XDECREF(dec->py_dec); | |
367 | /* The module itself. */ | |
368 | Py_XDECREF(dec->py_mod); | |
369 | ||
370 | /* TODO: (g_)free dec itself? */ | |
371 | ||
372 | return SRD_OK; | |
373 | } | |
374 | ||
375 | /** | |
376 | * Load all installed protocol decoders. | |
377 | * | |
378 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
379 | */ | |
380 | SRD_API int srd_load_all_decoders(void) | |
381 | { | |
382 | GDir *dir; | |
383 | GError *error; | |
384 | const gchar *direntry; | |
385 | ||
386 | if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) { | |
387 | srd_err("Unable to open %s for reading.", DECODERS_DIR); | |
388 | return SRD_ERR_DECODERS_DIR; | |
389 | } | |
390 | ||
391 | while ((direntry = g_dir_read_name(dir)) != NULL) { | |
392 | /* The directory name is the module name (e.g. "i2c"). */ | |
393 | srd_load_decoder(direntry); | |
394 | } | |
395 | g_dir_close(dir); | |
396 | ||
397 | return SRD_OK; | |
398 | } | |
399 | ||
400 | /** | |
401 | * Unload all loaded protocol decoders. | |
402 | * | |
403 | * @return SRD_OK upon success, a (negative) error code otherwise. | |
404 | */ | |
405 | SRD_API int srd_unload_all_decoders(void) | |
406 | { | |
407 | GSList *l; | |
408 | struct srd_decoder *dec; | |
409 | ||
410 | for (l = srd_list_decoders(); l; l = l->next) { | |
411 | dec = l->data; | |
412 | srd_unload_decoder(dec); | |
413 | } | |
414 | ||
415 | return SRD_OK; | |
416 | } |