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persist.c
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persist.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "conflate.h"
#include "conflate_internal.h"
#include "conflate_convenience.h"
#ifndef CONFLATE_NO_SQLITE
#include <sqlite3.h>
#define HAS_KEYS 1
#define HAS_VALUES 2
#define HAS_PRIVATE 4
#define CREATE_KEYS "create table keys " \
"(id integer primary key, name varchar(32))"
#define CREATE_VALUES "create table vals " \
"(key_id integer, value varchar(64))"
#define CREATE_PRIVATE "create table private " \
"(key varchar(256) primary key on conflict replace, " \
"value text not null)"
#define INS_KEYS "insert into keys (name) values (?)"
#define INS_VALS "insert into vals (key_id, value) values (?, ?)"
#define INS_PRIV "insert into private (key, value) values (?, ?)"
#define DEL_PRIV "delete from private where key = ?"
#define SEL_PRIV "select value from private where key = ?"
#define LOAD_KVPAIRS "select k.name, v.value " \
"from keys k join vals v on (k.id = v.key_id)"
/* safety-net */
#define MAX_STEPS 1024
static int run_mod_steps(conflate_handle_t *handle, sqlite3 *db,
sqlite3_stmt *statement)
__libconflate_gcc_attribute__ ((warn_unused_result, nonnull(1, 2, 3)));
/** \private */
struct table_mask_userdata {
int found;
conflate_handle_t *handle;
};
static int set_table_mask(void* arg, int n, char **vals, char **cols)
{
(void)cols;
struct table_mask_userdata *udata = (struct table_mask_userdata*)arg;
assert(n == 1);
if (strcmp(vals[0], "keys") == 0) {
udata->found |= HAS_KEYS;
} else if(strcmp(vals[0], "vals") == 0) {
udata->found |= HAS_VALUES;
} else if(strcmp(vals[0], "private") == 0) {
udata->found |= HAS_PRIVATE;
} else {
CONFLATE_LOG(udata->handle, LOG_LVL_WARN, "Unknown table: %s", vals[0]);
}
return SQLITE_OK;
}
static char* get_table_name(int flag) {
switch (flag) {
case HAS_KEYS:
return "keys";
case HAS_VALUES:
return "vals";
case HAS_PRIVATE:
return "private";
default:
fprintf(stderr, "Unhandled flag: %x\n", flag);
abort();
}
}
static bool db_do(conflate_handle_t *handle, sqlite3 *db, const char* query)
{
char* errmsg = NULL;
bool rv = true;
if (sqlite3_exec(db, query, NULL, NULL, &errmsg) != SQLITE_OK) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "DB Error: %s\n%s", errmsg, query);
sqlite3_free(errmsg);
rv = false;
}
return rv;
}
static bool maybe_create_table(conflate_handle_t *handle,
sqlite3 *db, int flag, int flags,
const char* query)
{
assert(db);
assert(query);
bool rv = true;
char* table_name = get_table_name(flag);
if (flag & flags) {
CONFLATE_LOG(handle, LOG_LVL_DEBUG, "Table %s already exists", table_name);
} else {
if (db_do(handle, db, query)) {
CONFLATE_LOG(handle, LOG_LVL_INFO, "Created table: %s", table_name);
} else {
CONFLATE_LOG(handle, LOG_LVL_WARN, "DB error creating table: %s", table_name);
rv = false;
}
}
return rv;
}
static bool initialize_db(conflate_handle_t *handle, sqlite3 *db)
{
bool rv = true;
char *errmsg = NULL;
char* query = "SELECT name FROM sqlite_master "
"WHERE type='table' "
"ORDER BY name;";
assert(db);
struct table_mask_userdata udata = { 0, handle };
if (sqlite3_exec(db, query, set_table_mask, &udata, &errmsg) != SQLITE_OK) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "DB error: %s", errmsg);
sqlite3_free(errmsg);
} else {
rv &= maybe_create_table(handle, db, HAS_KEYS, udata.found, CREATE_KEYS);
rv &= maybe_create_table(handle, db, HAS_VALUES, udata.found, CREATE_VALUES);
rv &= maybe_create_table(handle, db, HAS_PRIVATE, udata.found, CREATE_PRIVATE);
}
return rv;
}
static int open_and_initialize_db(conflate_handle_t *handle,
const char *filename,
sqlite3 **db)
{
int err = 0;
if ((err = sqlite3_open(filename, &*db)) != SQLITE_OK) {
return err;
}
if (!initialize_db(handle, *db)) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "Error initializing tables");
return SQLITE_ERROR;
}
return SQLITE_OK;
}
static int run_mod_steps(conflate_handle_t *handle, sqlite3 *db,
sqlite3_stmt *statement)
{
int steps_run = 0, rc = 0;
while ((rc = sqlite3_step(statement)) != SQLITE_DONE) {
steps_run++;
assert(steps_run < MAX_STEPS);
CONFLATE_LOG(handle, LOG_LVL_DEBUG, "statement step result: %d", rc);
}
return sqlite3_changes(db);
}
bool save_kvpairs(conflate_handle_t *handle, kvpair_t* kvpair,
const char *filename)
{
bool rv = false;
sqlite3 *db = NULL;
sqlite3_stmt *ins_keys = NULL, *ins_vals = NULL;
if ( open_and_initialize_db(handle, filename, &db) != SQLITE_OK) {
goto finished;
}
assert(db != NULL);
if (!db_do(handle, db, "begin transaction")) {
goto finished;
}
/* Cleanup the existing stuff */
if (!db_do(handle, db, "delete from keys")) {
goto finished;
}
if (!db_do(handle, db, "delete from vals")) {
goto finished;
}
/* Add the keys */
if (sqlite3_prepare_v2(db, INS_KEYS, strlen(INS_KEYS),
&ins_keys, NULL) != SQLITE_OK) {
goto finished;
}
/* Add the values */
if (sqlite3_prepare_v2(db, INS_VALS, strlen(INS_VALS),
&ins_vals, NULL) != SQLITE_OK) {
goto finished;
}
/* OK, Add them all in */
while (kvpair) {
int j = 0;
sqlite_int64 key_id;
sqlite3_clear_bindings(ins_keys);
sqlite3_clear_bindings(ins_vals);
sqlite3_bind_text(ins_keys, 1, kvpair->key, strlen(kvpair->key),
SQLITE_TRANSIENT);
if (run_mod_steps(handle, db, ins_keys) != 1) {
goto finished;
}
key_id = sqlite3_last_insert_rowid(db);
for (j = 0; kvpair->values[j]; j++) {
char* val = kvpair->values[j];
sqlite3_bind_int64(ins_vals, 1, key_id);
sqlite3_bind_text(ins_vals, 2, val, strlen(val), SQLITE_TRANSIENT);
if (run_mod_steps(handle, db, ins_vals) != 1) {
goto finished;
}
sqlite3_reset(ins_vals);
}
sqlite3_reset(ins_keys);
kvpair = kvpair -> next;
}
if (!db_do(handle, db, "commit")) {
goto finished;
}
rv = true;
finished:
if (sqlite3_errcode(db) != SQLITE_OK) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "DB error %d: %s",
sqlite3_errcode(db), sqlite3_errmsg(db));
}
if (ins_keys) {
sqlite3_finalize(ins_keys);
}
if (ins_vals) {
sqlite3_finalize(ins_vals);
}
sqlite3_close(db);
return rv;
}
static int append_kvpair_from_db(void* arg, int n, char **vals, char **cols)
{
(void)n;
(void)cols;
kvpair_t** pairs = (kvpair_t**)arg;
kvpair_t* pair = find_kvpair(*pairs, vals[0]);
/* If such a list doesn't already exist, one will be assigned to you */
if (!pair) {
pair = mk_kvpair(vals[0], NULL);
pair->next = *pairs;
*pairs = pair;
}
add_kvpair_value(pair, vals[1]);
return SQLITE_OK;
}
kvpair_t* load_kvpairs(conflate_handle_t *handle, const char *filename)
{
char* errmsg = NULL;
sqlite3 *db = NULL;
kvpair_t* pairs = NULL;
if (sqlite3_open(filename, &db) != SQLITE_OK) {
goto finished;
}
if (sqlite3_exec(db, LOAD_KVPAIRS, &append_kvpair_from_db, &pairs, &errmsg) != SQLITE_OK) {
goto finished;
}
finished:
if (sqlite3_errcode(db) != SQLITE_OK) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "DB error %d: %s",
sqlite3_errcode(db), sqlite3_errmsg(db));
if (errmsg) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, " %s", errmsg);
sqlite3_free(errmsg);
}
}
sqlite3_close(db);
return pairs;
}
bool conflate_save_private(conflate_handle_t *handle,
const char *k, const char *v, const char *filename)
{
bool rv = false;
int err = 0;
sqlite3 *db = NULL;
sqlite3_stmt *ins = NULL;
if ((err = open_and_initialize_db(handle, filename, &db)) != SQLITE_OK) {
goto finished;
}
assert(db != NULL);
if ((err = sqlite3_prepare_v2(db, INS_PRIV, strlen(INS_PRIV),
&ins, NULL)) != SQLITE_OK) {
goto finished;
}
sqlite3_bind_text(ins, 1, k, strlen(k), SQLITE_TRANSIENT);
sqlite3_bind_text(ins, 2, v, strlen(v), SQLITE_TRANSIENT);
rv = run_mod_steps(handle, db, ins) == 1;
finished:
err = sqlite3_errcode(db);
if (err != SQLITE_OK && err != SQLITE_DONE) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "DB error %d: %s",
sqlite3_errcode(db), sqlite3_errmsg(db));
}
if (ins) {
sqlite3_finalize(ins);
}
sqlite3_close(db);
return rv;
}
bool conflate_delete_private(conflate_handle_t *handle,
const char *k, const char *filename)
{
bool rv = false;
int err = 0, deleted = 0;
sqlite3 *db = NULL;
sqlite3_stmt *del = NULL;
if ((err = open_and_initialize_db(handle, filename, &db)) != SQLITE_OK) {
goto finished;
}
assert(db != NULL);
if ((err = sqlite3_prepare_v2(db, DEL_PRIV, strlen(DEL_PRIV),
&del, NULL)) != SQLITE_OK) {
goto finished;
}
sqlite3_bind_text(del, 1, k, strlen(k), SQLITE_TRANSIENT);
deleted = run_mod_steps(handle, db, del);
CONFLATE_LOG(handle, LOG_LVL_DEBUG, "Removed %d records", deleted);
rv = deleted >= 0;
finished:
err = sqlite3_errcode(db);
if (err != SQLITE_OK && err != SQLITE_DONE) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "DB error %d: %s",
sqlite3_errcode(db), sqlite3_errmsg(db));
}
if (del) {
sqlite3_finalize(del);
}
sqlite3_close(db);
return rv;
}
char *conflate_get_private(conflate_handle_t *handle,
const char *k, const char *filename)
{
char *errmsg = NULL;
sqlite3 *db = NULL;
sqlite3_stmt *get = NULL;
char *rv = NULL;
bool done = false;
int steps_run = 0, err = 0;
if (sqlite3_open(filename, &db) != SQLITE_OK) {
goto finished;
}
if (sqlite3_prepare_v2(db, SEL_PRIV, strlen(SEL_PRIV),
&get, NULL) != SQLITE_OK) {
goto finished;
}
sqlite3_bind_text(get, 1, k, strlen(k), SQLITE_TRANSIENT);
while (!done) {
switch(sqlite3_step(get)) {
case SQLITE_BUSY:
CONFLATE_LOG(handle, LOG_LVL_INFO, "DB was busy, retrying...\n");
break;
case SQLITE_ROW:
assert(rv == NULL);
rv = safe_strdup((char*)sqlite3_column_text(get, 0));
CONFLATE_LOG(handle, LOG_LVL_DEBUG, "Retrieved value for ``%s'': ``%s''",
k, rv);
break;
case SQLITE_DONE:
done = true;
break;
}
++steps_run;
assert(steps_run < MAX_STEPS);
}
finished:
err = sqlite3_errcode(db);
if (err != SQLITE_OK && err != SQLITE_DONE) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, "DB error %d: %s",
sqlite3_errcode(db), sqlite3_errmsg(db));
if (errmsg) {
CONFLATE_LOG(handle, LOG_LVL_ERROR, " %s", errmsg);
sqlite3_free(errmsg);
}
}
if (get) {
sqlite3_finalize(get);
}
sqlite3_close(db);
return rv;
}
#else // !CONFLATE_NO_SQLITE
kvpair_t* load_kvpairs(conflate_handle_t *handle, const char *filename)
{
(void)handle;
(void)filename;
return NULL;
}
bool save_kvpairs(conflate_handle_t *handle, kvpair_t* kvpair,
const char *filename)
{
(void)handle;
(void)kvpair;
(void)filename;
return true;
}
bool conflate_delete_private(conflate_handle_t *handle,
const char *k, const char *filename)
{
(void)handle;
(void)k;
(void)filename;
return true;
}
bool conflate_save_private(conflate_handle_t *handle,
const char *k, const char *v, const char *filename)
{
(void)handle;
(void)k;
(void)v;
(void)filename;
return true;
}
char *conflate_get_private(conflate_handle_t *handle,
const char *k, const char *filename)
{
(void)handle;
(void)k;
(void)filename;
return NULL;
}
#endif // !CONFLATE_NO_SQLITE