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#include <mbgl/util/filesource.hpp>
#include <mbgl/platform/platform.hpp>
#include <mbgl/platform/log.hpp>
#include <mbgl/util/compression.hpp>
#include <sqlite3.h>
#include <fstream>
#include <sstream>
namespace mbgl {
FileSource::FileSource() {
const int err = sqlite3_open_v2("cache.db", &db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, nullptr);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
db = nullptr;
}
createSchema();
}
FileSource::~FileSource() {
closeDatabase();
}
void FileSource::createSchema() {
if (db) {
// Create schema
const int err = sqlite3_exec(db,
"CREATE TABLE IF NOT EXISTS `http_cache` ("
"`url` TEXT PRIMARY KEY NOT NULL,"
"`code` INTEGER NOT NULL,"
"`type` INTEGER NOT NULL,"
"`modified` INTEGER,"
"`expires` INTEGER,"
"`data` BLOB,"
"`compressed` INTEGER NOT NULL DEFAULT 0"
");"
"CREATE INDEX IF NOT EXISTS `http_cache_type_idx` ON `http_cache` (`type`);", nullptr, nullptr, nullptr);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
closeDatabase();
}
}
}
void FileSource::closeDatabase() {
if (db) {
const int err = sqlite3_close_v2(db);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
db = nullptr;
}
}
void FileSource::setBase(const std::string &value) {
base = value;
}
const std::string &FileSource::getBase() const {
return base;
}
std::string removeAccessTokenFromURL(const std::string &url) {
const size_t token_start = url.find("access_token=");
// Ensure that token exists, isn't at the front and is preceded by either & or ?.
if (token_start == std::string::npos || token_start == 0 || !(url[token_start - 1] == '&' || url[token_start - 1] == '?')) {
return url;
}
const size_t token_end = url.find_first_of('&', token_start);
if (token_end == std::string::npos) {
// The token is the last query argument. We slice away the "&access_token=..." part
return url.substr(0, token_start - 1);
} else {
// We slice away the "access_token=...&" part.
return url.substr(0, token_start) + url.substr(token_end + 1);
}
}
bool FileSource::loadFile(ResourceType /*type*/, const std::string &url, std::function<void(platform::Response *)> callback) {
if (!db) {
return false;
}
sqlite3_stmt *stmt = nullptr;
int err;
err = sqlite3_prepare_v2(db, "SELECT `code`, `data`, `compressed` FROM `http_cache` WHERE `url` = ?", -1, &stmt, nullptr);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
return false;
}
err = sqlite3_bind_text(stmt, 1, url.data(), url.size(), nullptr);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return false;
}
bool status = false;
err = sqlite3_step(stmt);
if (err == SQLITE_ROW) {
// There is data.
platform::Response res(callback);
res.code = sqlite3_column_int(stmt, 0);
const char *data = reinterpret_cast<const char *>(sqlite3_column_blob(stmt, 1));
const size_t size = sqlite3_column_bytes(stmt, 1);
const bool compressed = sqlite3_column_int(stmt, 2);
if (compressed) {
res.body = util::decompress({ data, size });
} else {
res.body = { data, size };
}
callback(&res);
status = true;
} else if (err == SQLITE_DONE) {
// There is no data.
// This is a noop.
} else {
// Another error occured.
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return status;
}
void FileSource::saveFile(ResourceType type, const std::string &url, platform::Response *const res) {
if (!db) {
return;
}
sqlite3_stmt *stmt = nullptr;
int err;
err = sqlite3_prepare_v2(db, "REPLACE INTO `http_cache` (`url`, `code`, `type`, `modified`, `expires`, `data`, `compressed`) VALUES(?, ?, ?, ?, ?, ?, ?)", -1, &stmt, nullptr);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
return;
}
err = sqlite3_bind_text(stmt, 1, url.data(), url.size(), nullptr);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return;
}
err = sqlite3_bind_int(stmt, 2, res->code);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return;
}
err = sqlite3_bind_int(stmt, 3, int(type));
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return;
}
err = sqlite3_bind_int(stmt, 4, res->modified);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return;
}
err = sqlite3_bind_int(stmt, 5, res->expires);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return;
}
std::string data;
bool compressed = false;
switch (type) {
case ResourceType::Image:
err = sqlite3_bind_blob(stmt, 6, res->body.data(), res->body.size(), SQLITE_STATIC);
break;
default:
data = std::move(util::compress(res->body));
compressed = true;
err = sqlite3_bind_blob(stmt, 6, data.data(), data.size(), SQLITE_STATIC);
break;
}
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return;
}
err = sqlite3_bind_int(stmt, 7, compressed);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
return;
}
err = sqlite3_step(stmt);
if (err != SQLITE_DONE) {
// Another error occured.
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
err = sqlite3_finalize(stmt);
if (err != SQLITE_OK) {
Log::Warning(Event::Database, "%s: %s", sqlite3_errstr(err), sqlite3_errmsg(db));
}
}
void FileSource::load(ResourceType type, const std::string &url, std::function<void(platform::Response *)> callback, const std::shared_ptr<uv::loop> loop) {
// convert relative URLs to absolute URLs
const std::string absoluteURL = [&]() -> std::string {
const size_t separator = url.find("://");
if (separator == std::string::npos) {
// Relative URL.
return base + url;
} else {
return url;
}
}();
const size_t separator = absoluteURL.find("://");
const std::string protocol = separator != std::string::npos ? absoluteURL.substr(0, separator) : "";
if (protocol == "file") {
// load from disk
const std::string path = absoluteURL.substr(separator + 3);
std::ifstream file(path);
platform::Response response(callback);
if (!file.good()) {
response.error_message = "file not found (" + path + ")";
} else {
std::stringstream data;
data << file.rdbuf();
response.code = 200;
response.body = data.str();
}
callback(&response);
} else {
// Don't use the access token when storing/retrieving URLs from the database
const std::string cleanURL = removeAccessTokenFromURL(url);
// load from the internet
if (!loadFile(type, cleanURL, callback)) {
FileSource *source = this;
platform::request_http(absoluteURL, [=](platform::Response *res) {
source->saveFile(type, cleanURL, res);
callback(res);
}, loop);
}
}
}
}
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