Mercurial > paster
annotate database.c @ 1:836a698946f8
pasterd: add basic routes
author | David Demelier <markand@malikania.fr> |
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date | Tue, 04 Feb 2020 16:44:43 +0100 |
parents | 15a06aa20298 |
children | 65607ae124b1 |
rev | line source |
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0 | 1 #include <assert.h> |
2 #include <stdlib.h> | |
3 #include <stdio.h> | |
4 #include <string.h> | |
5 | |
6 #include <sqlite3.h> | |
7 | |
8 #include "database.h" | |
9 #include "log.h" | |
10 #include "paste.h" | |
11 #include "util.h" | |
12 | |
13 static sqlite3 *db; | |
14 | |
15 static const char *sql_init = | |
16 "BEGIN EXCLUSIVE TRANSACTION;\n" | |
17 "\n" | |
18 "CREATE TABLE IF NOT EXISTS paste(\n" | |
19 " uuid TEXT PRIMARY KEY,\n" | |
20 " title TEXT,\n" | |
21 " author TEXT,\n" | |
22 " language TEXT,\n" | |
23 " code TEXT,\n" | |
24 " date INT DEFAULT CURRENT_TIMESTAMP,\n" | |
25 " visible INTEGER DEFAULT 1,\n" | |
26 " duration INT\n" | |
27 ");\n" | |
28 "\n" | |
29 "END TRANSACTION"; | |
30 | |
31 static const char *sql_get = | |
32 "SELECT uuid\n" | |
33 " , title\n" | |
34 " , author\n" | |
35 " , language\n" | |
36 " , code\n" | |
37 " , strftime('%s', date)\n" | |
38 " , visible\n" | |
39 " , duration\n" | |
40 " FROM paste\n" | |
1
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pasterd: add basic routes
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41 " WHERE uuid = ?"; |
0 | 42 |
43 static const char *sql_insert = | |
44 "INSERT INTO paste(\n" | |
45 " uuid,\n" | |
46 " title,\n" | |
47 " author,\n" | |
48 " language,\n" | |
49 " code,\n" | |
50 " visible,\n" | |
51 " duration\n" | |
52 ") VALUES (?, ?, ?, ?, ?, ?, ?)"; | |
53 | |
54 static const char *sql_recents = | |
55 "SELECT uuid\n" | |
56 " , title\n" | |
57 " , author\n" | |
58 " , language\n" | |
59 " , code\n" | |
60 " , strftime('%s', date) AS date\n" | |
61 " , visible\n" | |
62 " , duration\n" | |
63 " FROM paste\n" | |
64 " ORDER BY date\n" | |
65 " LIMIT ?\n"; | |
66 | |
67 static const char *sql_clear = | |
68 "BEGIN EXCLUSIVE TRANSACTION;\n" | |
69 "\n" | |
70 "DELETE\n" | |
71 " FROM paste\n" | |
72 " WHERE strftime('%s', 'now') - strftime('%s', date) >= duration;" | |
73 "\n" | |
74 "END TRANSACTION"; | |
75 | |
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76 /* sqlite3 use const unsigned char *. */ |
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77 static char * |
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78 dup(const unsigned char *s) |
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79 { |
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80 return estrdup(s ? (const char *)(s) : ""); |
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81 } |
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82 |
0 | 83 static const char * |
84 create_id(void) | |
85 { | |
86 static char uuid[256]; | |
87 | |
88 /* | |
89 * Not a very strong generation but does not require to link against | |
90 * util-linux. | |
91 * | |
92 * See https://stackoverflow.com/questions/2174768/generating-random-uuids-in-linux | |
93 */ | |
94 sprintf(uuid, "%x%x-%x-%x-%x-%x%x%x", | |
95 rand(), rand(), | |
96 rand(), | |
97 ((rand() & 0x0fff) | 0x4000), | |
98 rand() % 0x3fff + 0x8000, | |
99 rand(), rand(), rand()); | |
100 | |
101 return uuid; | |
102 } | |
103 | |
104 static void | |
105 convert(sqlite3_stmt *stmt, struct paste *paste) | |
106 { | |
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107 paste->uuid = dup(sqlite3_column_text(stmt, 0)); |
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parents:
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108 paste->title = dup(sqlite3_column_text(stmt, 1)); |
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David Demelier <markand@malikania.fr>
parents:
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diff
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109 paste->author = dup(sqlite3_column_text(stmt, 2)); |
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David Demelier <markand@malikania.fr>
parents:
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110 paste->language = dup(sqlite3_column_text(stmt, 3)); |
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David Demelier <markand@malikania.fr>
parents:
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diff
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111 paste->code = dup(sqlite3_column_text(stmt, 4)); |
0 | 112 paste->timestamp = sqlite3_column_int64(stmt, 5); |
113 paste->visible = sqlite3_column_int(stmt, 6); | |
114 paste->duration = sqlite3_column_int64(stmt, 7); | |
115 } | |
116 | |
117 bool | |
118 database_open(const char *path) | |
119 { | |
120 assert(path); | |
121 | |
122 log_debug("opening database: %s\n", path); | |
123 | |
124 if (sqlite3_open(path, &db) != SQLITE_OK) { | |
125 log_warn("unable to open %s: %s\n", path, sqlite3_errmsg(db)); | |
126 return false; | |
127 } | |
128 | |
129 if (sqlite3_exec(db, sql_init, NULL, NULL, NULL) != SQLITE_OK) { | |
130 log_warn("unable to initialize %s: %s\n", path, sqlite3_errmsg(db)); | |
131 return false; | |
132 } | |
133 | |
134 log_debug("successfully opened database: %s\n", path); | |
135 | |
136 return true; | |
137 } | |
138 | |
139 bool | |
140 database_recents(struct paste *pastes, size_t *max) | |
141 { | |
142 assert(pastes); | |
143 assert(max); | |
144 | |
145 sqlite3_stmt *stmt = NULL; | |
146 | |
147 memset(pastes, 0, *max * sizeof (struct paste)); | |
148 | |
149 if (sqlite3_prepare(db, sql_recents, -1, &stmt, NULL) != SQLITE_OK || | |
150 sqlite3_bind_int64(stmt, 1, *max) != SQLITE_OK) | |
151 goto sqlite_err; | |
152 | |
153 size_t i = 0; | |
154 | |
155 for (; i < *max && sqlite3_step(stmt) == SQLITE_ROW; ++i) | |
156 convert(stmt, &pastes[i]); | |
157 | |
158 sqlite3_finalize(stmt); | |
159 *max = i; | |
160 | |
161 return true; | |
162 | |
163 sqlite_err: | |
164 log_warn("database error (recents): %s\n", sqlite3_errmsg(db)); | |
165 | |
166 if (stmt) | |
167 sqlite3_finalize(stmt); | |
168 | |
169 return (*max = 0); | |
170 } | |
171 | |
172 bool | |
173 database_get(struct paste *paste, const char *uuid) | |
174 { | |
175 assert(paste); | |
176 assert(uuid); | |
177 | |
178 memset(paste, 0, sizeof (struct paste)); | |
179 | |
180 sqlite3_stmt* stmt = NULL; | |
181 | |
182 if (sqlite3_prepare(db, sql_get, -1, &stmt, NULL) != SQLITE_OK || | |
183 sqlite3_bind_text(stmt, 1, uuid, -1, NULL) != SQLITE_OK) | |
184 goto sqlite_err; | |
185 | |
186 switch (sqlite3_step(stmt)) { | |
187 case SQLITE_ROW: | |
188 convert(stmt, paste); | |
189 break; | |
190 case SQLITE_MISUSE: | |
191 case SQLITE_ERROR: | |
192 goto sqlite_err; | |
193 default: | |
194 break; | |
195 } | |
196 | |
197 sqlite3_finalize(stmt); | |
198 | |
199 return true; | |
200 | |
201 sqlite_err: | |
202 if (stmt) | |
203 sqlite3_finalize(stmt); | |
204 | |
205 log_warn("database error (get): %s", sqlite3_errmsg(db)); | |
206 | |
207 return false; | |
208 } | |
209 | |
210 bool | |
211 database_insert(struct paste *paste) | |
212 { | |
213 assert(paste); | |
214 | |
215 sqlite3_stmt* stmt = NULL; | |
216 | |
217 if (sqlite3_exec(db, "BEGIN EXCLUSIVE TRANSACTION", NULL, NULL, NULL) != SQLITE_OK) { | |
218 log_warn("could not lock database: %s\n", sqlite3_errmsg(db)); | |
219 return false; | |
220 } | |
221 | |
222 if (sqlite3_prepare(db, sql_insert, -1, &stmt, NULL) != SQLITE_OK) | |
223 goto sqlite_err; | |
224 | |
225 /* Create a new uuid first. */ | |
226 paste->uuid = estrdup(create_id()); | |
227 | |
228 sqlite3_bind_text(stmt, 1, paste->uuid, -1, SQLITE_STATIC); | |
229 sqlite3_bind_text(stmt, 2, paste->title, -1, SQLITE_STATIC); | |
230 sqlite3_bind_text(stmt, 3, paste->author, -1, SQLITE_STATIC); | |
231 sqlite3_bind_text(stmt, 4, paste->language, -1, SQLITE_STATIC); | |
232 sqlite3_bind_text(stmt, 5, paste->code, -1, SQLITE_STATIC); | |
233 sqlite3_bind_int(stmt, 6, paste->visible); | |
234 sqlite3_bind_int64(stmt, 7, paste->duration); | |
235 | |
236 if (sqlite3_step(stmt) != SQLITE_DONE) | |
237 goto sqlite_err; | |
238 | |
239 sqlite3_exec(db, "COMMIT", NULL, NULL, NULL); | |
240 sqlite3_finalize(stmt); | |
241 | |
242 log_debug("new paste (%s) from %s expires in one %lld seconds", | |
243 paste->uuid, paste->author, paste->duration); | |
244 | |
245 return true; | |
246 | |
247 sqlite_err: | |
248 log_warn("database error (insert): %s", sqlite3_errmsg(db)); | |
249 sqlite3_exec(db, "ROLLBACK", NULL, NULL, NULL); | |
250 | |
251 if (stmt) | |
252 sqlite3_finalize(stmt); | |
253 | |
254 free(paste->uuid); | |
255 paste->uuid = NULL; | |
256 | |
257 return false; | |
258 } | |
259 | |
260 void | |
261 database_clear(void) | |
262 { | |
263 if (sqlite3_exec(db, sql_clear, NULL, NULL, NULL) != SQLITE_OK) | |
264 log_warn("database error (clear): %s\n", sqlite3_errmsg(db)); | |
265 } | |
266 | |
267 void | |
268 database_finish(void) | |
269 { | |
270 if (db) | |
271 sqlite3_close(db); | |
272 } |