1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
#include "SqliteBackend.h"
#include <picosha2.h>
#include <stdexcept>
namespace nt {
SqliteBackend::SqliteBackend(const std::string& path) {
if (sqlite3_open(path.c_str(), &db_) != SQLITE_OK)
throw std::runtime_error(sqlite3_errmsg(db_));
const char* schema = "CREATE TABLE IF NOT EXISTS kv ("
" hash TEXT PRIMARY KEY,"
" value BLOB NOT NULL"
");";
char* err = nullptr;
if (sqlite3_exec(db_, schema, nullptr, nullptr, &err) != SQLITE_OK) {
std::string msg(err);
sqlite3_free(err);
throw std::runtime_error(msg);
}
}
SqliteBackend::~SqliteBackend() {
sqlite3_close(db_);
}
std::string SqliteBackend::Put(std::vector<uint8_t> value) {
const std::string hash = picosha2::hash256_hex_string(value.begin(), value.end());
sqlite3_stmt* stmt = nullptr;
sqlite3_prepare_v2(db_, "INSERT OR IGNORE INTO kv (hash, value) VALUES (?, ?)", -1, &stmt,
nullptr);
sqlite3_bind_text(stmt, 1, hash.c_str(), -1, SQLITE_TRANSIENT);
sqlite3_bind_blob(stmt, 2, value.data(), static_cast<int>(value.size()), SQLITE_TRANSIENT);
sqlite3_step(stmt);
sqlite3_finalize(stmt);
return hash;
}
std::optional<std::vector<uint8_t>> SqliteBackend::Get(const std::string& hash) {
sqlite3_stmt* stmt = nullptr;
sqlite3_prepare_v2(db_, "SELECT value FROM kv WHERE hash = ?", -1, &stmt, nullptr);
sqlite3_bind_text(stmt, 1, hash.c_str(), -1, SQLITE_TRANSIENT);
std::optional<std::vector<uint8_t>> result;
if (sqlite3_step(stmt) == SQLITE_ROW) {
const auto* blob = static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 0));
int size = sqlite3_column_bytes(stmt, 0);
result = std::vector<uint8_t>(blob, blob + size);
}
sqlite3_finalize(stmt);
return result;
}
} // namespace nt
|
