Mercurial > paster
annotate database.c @ 8:0f1d65d5ea89
pasterd: bring visibility into /fork
author | David Demelier <markand@malikania.fr> |
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date | Wed, 05 Feb 2020 14:16:00 +0100 |
parents | 98ef2713eb0d |
children | 21c103c33ac9 |
rev | line source |
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1 /* |
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2 * database.c -- sqlite storage |
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3 * |
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr> |
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5 * |
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6 * Permission to use, copy, modify, and/or distribute this software for any |
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7 * purpose with or without fee is hereby granted, provided that the above |
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8 * copyright notice and this permission notice appear in all copies. |
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9 * |
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 */ |
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18 |
0 | 19 #include <assert.h> |
20 #include <stdlib.h> | |
21 #include <stdio.h> | |
22 #include <string.h> | |
23 | |
24 #include <sqlite3.h> | |
25 | |
26 #include "database.h" | |
27 #include "log.h" | |
28 #include "paste.h" | |
29 #include "util.h" | |
30 | |
31 static sqlite3 *db; | |
32 | |
33 static const char *sql_init = | |
34 "BEGIN EXCLUSIVE TRANSACTION;\n" | |
35 "\n" | |
36 "CREATE TABLE IF NOT EXISTS paste(\n" | |
37 " uuid TEXT PRIMARY KEY,\n" | |
38 " title TEXT,\n" | |
39 " author TEXT,\n" | |
40 " language TEXT,\n" | |
41 " code TEXT,\n" | |
42 " date INT DEFAULT CURRENT_TIMESTAMP,\n" | |
43 " visible INTEGER DEFAULT 1,\n" | |
44 " duration INT\n" | |
45 ");\n" | |
46 "\n" | |
47 "END TRANSACTION"; | |
48 | |
49 static const char *sql_get = | |
50 "SELECT uuid\n" | |
51 " , title\n" | |
52 " , author\n" | |
53 " , language\n" | |
54 " , code\n" | |
55 " , strftime('%s', date)\n" | |
56 " , visible\n" | |
57 " , duration\n" | |
58 " FROM paste\n" | |
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59 " WHERE uuid = ?"; |
0 | 60 |
61 static const char *sql_insert = | |
62 "INSERT INTO paste(\n" | |
63 " uuid,\n" | |
64 " title,\n" | |
65 " author,\n" | |
66 " language,\n" | |
67 " code,\n" | |
68 " visible,\n" | |
69 " duration\n" | |
70 ") VALUES (?, ?, ?, ?, ?, ?, ?)"; | |
71 | |
72 static const char *sql_recents = | |
73 "SELECT uuid\n" | |
74 " , title\n" | |
75 " , author\n" | |
76 " , language\n" | |
77 " , code\n" | |
78 " , strftime('%s', date) AS date\n" | |
79 " , visible\n" | |
80 " , duration\n" | |
81 " FROM paste\n" | |
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82 " WHERE visible = 1\n" |
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83 " ORDER BY date DESC\n" |
0 | 84 " LIMIT ?\n"; |
85 | |
86 static const char *sql_clear = | |
87 "BEGIN EXCLUSIVE TRANSACTION;\n" | |
88 "\n" | |
89 "DELETE\n" | |
90 " FROM paste\n" | |
91 " WHERE strftime('%s', 'now') - strftime('%s', date) >= duration;" | |
92 "\n" | |
93 "END TRANSACTION"; | |
94 | |
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95 /* sqlite3 use const unsigned char *. */ |
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96 static char * |
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97 dup(const unsigned char *s) |
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98 { |
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99 return estrdup(s ? (const char *)(s) : ""); |
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100 } |
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101 |
0 | 102 static const char * |
103 create_id(void) | |
104 { | |
105 static char uuid[256]; | |
106 | |
107 /* | |
108 * Not a very strong generation but does not require to link against | |
109 * util-linux. | |
110 * | |
111 * See https://stackoverflow.com/questions/2174768/generating-random-uuids-in-linux | |
112 */ | |
113 sprintf(uuid, "%x%x-%x-%x-%x-%x%x%x", | |
114 rand(), rand(), | |
115 rand(), | |
116 ((rand() & 0x0fff) | 0x4000), | |
117 rand() % 0x3fff + 0x8000, | |
118 rand(), rand(), rand()); | |
119 | |
120 return uuid; | |
121 } | |
122 | |
123 static void | |
124 convert(sqlite3_stmt *stmt, struct paste *paste) | |
125 { | |
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126 paste->uuid = dup(sqlite3_column_text(stmt, 0)); |
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127 paste->title = dup(sqlite3_column_text(stmt, 1)); |
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128 paste->author = dup(sqlite3_column_text(stmt, 2)); |
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129 paste->language = dup(sqlite3_column_text(stmt, 3)); |
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130 paste->code = dup(sqlite3_column_text(stmt, 4)); |
0 | 131 paste->timestamp = sqlite3_column_int64(stmt, 5); |
132 paste->visible = sqlite3_column_int(stmt, 6); | |
133 paste->duration = sqlite3_column_int64(stmt, 7); | |
134 } | |
135 | |
136 bool | |
137 database_open(const char *path) | |
138 { | |
139 assert(path); | |
140 | |
141 log_debug("opening database: %s\n", path); | |
142 | |
143 if (sqlite3_open(path, &db) != SQLITE_OK) { | |
144 log_warn("unable to open %s: %s\n", path, sqlite3_errmsg(db)); | |
145 return false; | |
146 } | |
147 | |
148 if (sqlite3_exec(db, sql_init, NULL, NULL, NULL) != SQLITE_OK) { | |
149 log_warn("unable to initialize %s: %s\n", path, sqlite3_errmsg(db)); | |
150 return false; | |
151 } | |
152 | |
153 log_debug("successfully opened database: %s\n", path); | |
154 | |
155 return true; | |
156 } | |
157 | |
158 bool | |
159 database_recents(struct paste *pastes, size_t *max) | |
160 { | |
161 assert(pastes); | |
162 assert(max); | |
163 | |
164 sqlite3_stmt *stmt = NULL; | |
165 | |
166 memset(pastes, 0, *max * sizeof (struct paste)); | |
167 | |
168 if (sqlite3_prepare(db, sql_recents, -1, &stmt, NULL) != SQLITE_OK || | |
169 sqlite3_bind_int64(stmt, 1, *max) != SQLITE_OK) | |
170 goto sqlite_err; | |
171 | |
172 size_t i = 0; | |
173 | |
174 for (; i < *max && sqlite3_step(stmt) == SQLITE_ROW; ++i) | |
175 convert(stmt, &pastes[i]); | |
176 | |
177 sqlite3_finalize(stmt); | |
178 *max = i; | |
179 | |
180 return true; | |
181 | |
182 sqlite_err: | |
183 log_warn("database error (recents): %s\n", sqlite3_errmsg(db)); | |
184 | |
185 if (stmt) | |
186 sqlite3_finalize(stmt); | |
187 | |
188 return (*max = 0); | |
189 } | |
190 | |
191 bool | |
192 database_get(struct paste *paste, const char *uuid) | |
193 { | |
194 assert(paste); | |
195 assert(uuid); | |
196 | |
197 memset(paste, 0, sizeof (struct paste)); | |
198 | |
199 sqlite3_stmt* stmt = NULL; | |
200 | |
201 if (sqlite3_prepare(db, sql_get, -1, &stmt, NULL) != SQLITE_OK || | |
202 sqlite3_bind_text(stmt, 1, uuid, -1, NULL) != SQLITE_OK) | |
203 goto sqlite_err; | |
204 | |
205 switch (sqlite3_step(stmt)) { | |
206 case SQLITE_ROW: | |
207 convert(stmt, paste); | |
208 break; | |
209 case SQLITE_MISUSE: | |
210 case SQLITE_ERROR: | |
211 goto sqlite_err; | |
212 default: | |
213 break; | |
214 } | |
215 | |
216 sqlite3_finalize(stmt); | |
217 | |
218 return true; | |
219 | |
220 sqlite_err: | |
221 if (stmt) | |
222 sqlite3_finalize(stmt); | |
223 | |
224 log_warn("database error (get): %s", sqlite3_errmsg(db)); | |
225 | |
226 return false; | |
227 } | |
228 | |
229 bool | |
230 database_insert(struct paste *paste) | |
231 { | |
232 assert(paste); | |
233 | |
234 sqlite3_stmt* stmt = NULL; | |
235 | |
236 if (sqlite3_exec(db, "BEGIN EXCLUSIVE TRANSACTION", NULL, NULL, NULL) != SQLITE_OK) { | |
237 log_warn("could not lock database: %s\n", sqlite3_errmsg(db)); | |
238 return false; | |
239 } | |
240 | |
241 if (sqlite3_prepare(db, sql_insert, -1, &stmt, NULL) != SQLITE_OK) | |
242 goto sqlite_err; | |
243 | |
244 /* Create a new uuid first. */ | |
245 paste->uuid = estrdup(create_id()); | |
246 | |
247 sqlite3_bind_text(stmt, 1, paste->uuid, -1, SQLITE_STATIC); | |
248 sqlite3_bind_text(stmt, 2, paste->title, -1, SQLITE_STATIC); | |
249 sqlite3_bind_text(stmt, 3, paste->author, -1, SQLITE_STATIC); | |
250 sqlite3_bind_text(stmt, 4, paste->language, -1, SQLITE_STATIC); | |
251 sqlite3_bind_text(stmt, 5, paste->code, -1, SQLITE_STATIC); | |
252 sqlite3_bind_int(stmt, 6, paste->visible); | |
253 sqlite3_bind_int64(stmt, 7, paste->duration); | |
254 | |
255 if (sqlite3_step(stmt) != SQLITE_DONE) | |
256 goto sqlite_err; | |
257 | |
258 sqlite3_exec(db, "COMMIT", NULL, NULL, NULL); | |
259 sqlite3_finalize(stmt); | |
260 | |
261 log_debug("new paste (%s) from %s expires in one %lld seconds", | |
262 paste->uuid, paste->author, paste->duration); | |
263 | |
264 return true; | |
265 | |
266 sqlite_err: | |
267 log_warn("database error (insert): %s", sqlite3_errmsg(db)); | |
268 sqlite3_exec(db, "ROLLBACK", NULL, NULL, NULL); | |
269 | |
270 if (stmt) | |
271 sqlite3_finalize(stmt); | |
272 | |
273 free(paste->uuid); | |
274 paste->uuid = NULL; | |
275 | |
276 return false; | |
277 } | |
278 | |
279 void | |
280 database_clear(void) | |
281 { | |
282 if (sqlite3_exec(db, sql_clear, NULL, NULL, NULL) != SQLITE_OK) | |
283 log_warn("database error (clear): %s\n", sqlite3_errmsg(db)); | |
284 } | |
285 | |
286 void | |
287 database_finish(void) | |
288 { | |
289 if (db) | |
290 sqlite3_close(db); | |
291 } |