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#include "sql.h"
#include "log.h"
#include <ctype.h>
#include <limits.h>
#include <microhttpd.h>
#include <string.h>
struct sqlite3_stmt *statements[STMTIDX_SIZE] = {NULL};
struct sql_state state = {NULL};
const char
*INIT_SQL =
"CREATE TABLE IF NOT EXISTS links ( "
"id INTEGER PRIMARY KEY, "
"url STRING NOT NULL, "
"created INTEGER NOT NULL "
");",
*INSERT_SQL =
"INSERT INTO links (id,url,created) "
"VALUES (?1, ?2, unixepoch());",
*DELETE_SQL =
"DELETE FROM links "
"WHERE id = ?1;",
*SELECT_SQL =
"SELECT url,created FROM links "
"WHERE id = ?1;",
*RESET_SQL = "DROP TABLE links;",
*GETN_SQL = "SELECT leastunused(id) FROM links;";
/* sqlite leastunused implementation */
void step_leastunused(sqlite3_context* ctx, int argc, sqlite3_value** argv) {
struct slidid *idx = sqlite3_aggregate_context(ctx, sizeof *idx);
if (idx->res) return;
idx->in = sqlite3_value_int64(argv[0]);
if (idx->in <= 0) return;
if (idx->il + 1 != idx->in) idx->res = idx->il + 1;
idx->il = idx->in;
}
void final_leastunused(sqlite3_context* ctx) {
struct slidid *idx = sqlite3_aggregate_context(ctx, 0);
if (idx == NULL) {
sqlite3_result_int64(ctx, 1);
return;
}
if (idx->res == 0) {
sqlite3_result_int64(ctx, idx->in + 1);
return;
}
sqlite3_result_int64(ctx, idx->res);
}
void sqlite_init(const char *db) {
sqlite3 *ret;
sqlite3_open_v2(db, &ret, SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE, NULL);
if (ret == NULL) LCRIT(1, "could not open sqlite3 database");
sqlite3_prepare(ret, INIT_SQL, -1, statements +STMTIDX_INIT, NULL);
if (SQLITE_DONE != sqlite3_step(statements[STMTIDX_INIT])) LERRVF("Error initializing database: %s", sqlite3_errmsg(ret));
sqlite3_reset(statements[STMTIDX_INIT]);
sqlite3_create_function(ret, "leastunused", 1, SQLITE_UTF8, NULL, NULL, step_leastunused, final_leastunused);
const char *queries[STMTIDX_SIZE] = {INIT_SQL, INSERT_SQL, DELETE_SQL, SELECT_SQL, RESET_SQL, GETN_SQL};
for (int i = 1; i < STMTIDX_SIZE; ++i) sqlite3_prepare(ret, queries[i], -1, statements + i, NULL);
state.db = ret;
}
// alphabet: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
// returns 0 if no conversion is available
static inline char itoc(register unsigned long l) {
#ifdef __GNUC__
char add[256] = {
[0 ... 9] = '0',
[10 ... 35] = 'a' - 10,
[36 ... 61] = 'A' - 10 - 26,
};
return (l < 62) * (l + add[l]);
#else
if (l < 10) return '0' + l;
if (l < 10 + 26) return 'a' + l - 10;
if (l < 10 + 2 * 26) return 'A' + l - 10 - 26;
return '\0';
#endif
}
// returns negative number if conversion not available
static inline unsigned long ctoi(register char c) {
#ifdef __GNUC__
char sub[127] = {
[0 ... '0'-1] = 128,
['0' ... '9'] = '0',
['A' ... 'Z'] = 'A' - 26 - 10,
['a' ... 'z'] = 'a' - 10,
};
return c - sub[c];
#else
TODO;
#endif
}
// buf must be at least 12 characters (11 for strnig and 1 for termination byte)
// returns a pointer from which the string starts
static char *itou(register unsigned long i, register char *buf) {
register ssize_t ind = 11;
buf[ind] = '\0';
buf[ind - 1] = '0';
while (ind >= 0 && i) {
buf[--ind] = itoc(i % 62);
i /= 62;
}
return buf + ind;
}
static unsigned long utoi(const char *s) {
register unsigned long result = 0;
while (*s) {
unsigned long ctoires = ctoi(*s);
// overflow check
if ((ULONG_MAX - ctoires) / 62 <= result) return 0;
result *= 62;
result += ctoires;
++s;
}
return result;
}
void sqlite_deinit(void) {
for (size_t i = 0; i < STMTIDX_SIZE; ++i)
sqlite3_finalize(statements[i]);
sqlite3_close(state.db);
}
enum dberror db_add_url(const char *url, const char *path, char **out) {
sqlite3_int64 index;
if (path) {
for(const char *i = path; *i; ++i)
if (!isalpha(*i) && !isdigit(*i)) return DBERROR_INVAL;
index = utoi(path);
if (index == 0) return DBERROR_TOOBIG;
} else {
if (SQLITE_ROW != sqlite3_step(statements[STMTIDX_GETN])) {
sqlite3_reset(statements[STMTIDX_GETN]);
return DBERROR_SERVER;
}
index = sqlite3_column_int64(statements[STMTIDX_GETN], 0);
sqlite3_reset(statements[STMTIDX_GETN]);
}
if (SQLITE_OK != sqlite3_bind_int64(statements[STMTIDX_INSERT], 1, index)) return DBERROR_SERVER;
if (SQLITE_OK != sqlite3_bind_text(statements[STMTIDX_INSERT], 2, url, -1, SQLITE_TRANSIENT)) return DBERROR_SERVER;
*out = itou(index, *out);
int res;
if (SQLITE_DONE != (res = sqlite3_step(statements[STMTIDX_INSERT]))) {
LWARNVF("sqlite insert failed with error %i", res);
*out = NULL;
sqlite3_reset(statements[STMTIDX_INSERT]);
return DBERROR_OCCUPIED;
}
sqlite3_reset(statements[STMTIDX_INSERT]);
return DBERROR_SUCCESS;
}
bool db_del_url(const char *path) {
return false; // lick my balls
}
char *db_get_info(const char *path, long *dong) {
*dong = 0;
return NULL;
}
char *db_get_url(const char *path) {
char *ret = NULL;
sqlite3_int64 index = utoi(path);
if (SQLITE_OK != sqlite3_bind_int64(statements[STMTIDX_SELECT], 1, index)) return NULL;
if (SQLITE_ROW == sqlite3_step(statements[STMTIDX_SELECT])) {
const unsigned char *c = sqlite3_column_text(statements[STMTIDX_SELECT], 0);
size_t sz = sqlite3_column_bytes(statements[STMTIDX_SELECT], 0);
ret = malloc(sz + 1);
memcpy(ret, c, sz);
ret[sz] = '\0';
}
sqlite3_reset(statements[STMTIDX_SELECT]);
return ret;
}
const char *db_error(enum dberror e) {
switch (e) {
case DBERROR_SUCCESS: return "success";
case DBERROR_ARGS: return "insufficient arguments";
case DBERROR_INVAL: return "invalid arguments";
case DBERROR_OCCUPIED: return "occupied";
case DBERROR_SERVER: return "server error";
case DBERROR_TOOBIG: return "path too long";
case DBERROR_UNKNOWN: return "unknown";
}
}
int db_error_status(enum dberror e) {
switch (e) {
case DBERROR_SUCCESS: return MHD_HTTP_OK;
case DBERROR_ARGS: return MHD_HTTP_BAD_REQUEST;
case DBERROR_INVAL: return MHD_HTTP_BAD_REQUEST;
case DBERROR_OCCUPIED: return MHD_HTTP_BAD_REQUEST;
case DBERROR_SERVER: return MHD_HTTP_INTERNAL_SERVER_ERROR;
case DBERROR_TOOBIG: return MHD_HTTP_URI_TOO_LONG;
case DBERROR_UNKNOWN: return MHD_HTTP_INTERNAL_SERVER_ERROR;
}
}
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