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#include "../include/Database.hpp"
#include "../include/Group.hpp"
#include "../include/User.hpp"
#include <opendht.h>
#include <fmt/format.h>
#include <sodium/crypto_box_curve25519xchacha20poly1305.h>
#include <thread>
#include <chrono>
#include <sibs/SafeSerializer.hpp>
#include <sibs/SafeDeserializer.hpp>
#include <cassert>
using namespace dht;
using namespace std;
using namespace chrono_literals;
static int databaseCount = 0;
// TODO: Verify time_t is always signed
static time_t timeOffset = 0; // Updated by comparing local time with ntp server
static thread *ntpThread = nullptr;
static bool timestampSynced = false;
static InfoHash CREATE_DATA_HASH = InfoHash::get("__odhtdb__.create_data");
static InfoHash ADD_DATA_HASH = InfoHash::get("__odhtdb__.add_data");
#define OPENDHT_INFOHASH_LEN 20
namespace odhtdb
{
Database::Database(const char *bootstrapNodeAddr, u16 port)
{
node.run(port, dht::crypto::generateIdentity(), true);
fmt::MemoryWriter portStr;
portStr << port;
node.bootstrap(bootstrapNodeAddr, portStr.c_str());
// TODO: Make this work for multiple threads initializing database at same time
++databaseCount;
if(databaseCount == 1)
{
if(ntpThread)
delete ntpThread;
ntpThread = new thread([]()
{
ntp::NtpClient ntpClient("pool.ntp.org");
while(databaseCount > 0)
{
ntp::NtpTimestamp ntpTimestamp = ntpClient.getTimestamp();
timeOffset = time(nullptr) - ntpTimestamp.seconds;
timestampSynced = true;
// TODO: Also use timestamp fraction (milliseconds)
this_thread::sleep_for(60s);
}
timestampSynced = false;
});
// TODO: Catch std::system_error instead of this if-statement
if(ntpThread->joinable())
ntpThread->detach();
}
while(!timestampSynced)
{
this_thread::sleep_for(10ms);
}
}
Database::~Database()
{
// TODO: Make this work for multiple threads removing database object at same time
--databaseCount;
node.join();
}
void Database::seed()
{
// TODO: Use cached files and seed those. If none exists, request new files to seed.
// If nobody requests my cached files in a long time, request new files to seed and remove cached files
// (only if there are plenty of other seeders for the cached files. This could also cause race issue
// where all nodes with a cached file delete it at same time)
using std::placeholders::_1;
node.listen(CREATE_DATA_HASH, bind(&Database::listenCreateData, this, _1));
node.listen(ADD_DATA_HASH, bind(&Database::listenAddData, this, _1));
}
void Database::create(const Key &key, Group *primaryAdminGroup)
{
// TODO: Append fractions to get real microseconds time
u64 timeMicroseconds = ((u64)getSyncedTimestampUtc().seconds) * 1000000ull;
stagedCreateObjects.emplace_back(StagedCreateObject(key, primaryAdminGroup, timeMicroseconds));
}
void Database::add(const Key &key, DataView data)
{
// TODO: Append fractions to get real microseconds time
u64 timeMicroseconds = ((u64)getSyncedTimestampUtc().seconds) * 1000000ull;
stagedAddObjects.emplace_back(StagedAddObject(key, data, timeMicroseconds));
}
void Database::commit()
{
// TODO: Combine staged objects into one object for efficiency.
// TODO: Add rollback
for(StagedCreateObject &stagedObject : stagedCreateObjects)
{
commitStagedCreateObject(stagedObject);
}
stagedCreateObjects.clear();
for(StagedAddObject &stagedObject : stagedAddObjects)
{
commitStagedAddObject(stagedObject);
}
stagedAddObjects.clear();
}
void Database::commitStagedCreateObject(const StagedCreateObject &stagedObject)
{
// TODO: Use (ed25519 or poly1305) and curve25519
// TODO: Implement gas and price (refill when serving content (seeding) or by waiting. This is done to prevent spamming and bandwidth leeching)
sibs::SafeSerializer serializer;
assert(stagedObject.key.hashedKey.size() == OPENDHT_INFOHASH_LEN);
serializer.add(stagedObject.key.hashedKey.data(), stagedObject.key.hashedKey.size());
serializer.add(stagedObject.timestamp);
serializer.add((u8)stagedObject.primaryAdminGroup->getName().size());
serializer.add((u8*)stagedObject.primaryAdminGroup->getName().data(), stagedObject.primaryAdminGroup->getName().size());
serializer.add((u32)stagedObject.primaryAdminGroup->getUsers().size());
for(User *user : stagedObject.primaryAdminGroup->getUsers())
{
serializer.add((u8)user->getName().size());
serializer.add((u8*)user->getName().data(), user->getName().size());
}
// TODO: Verify if serializer buffer needs to survive longer than this scope
Value value(serializer.getBuffer().data(), serializer.getBuffer().size());
node.put(CREATE_DATA_HASH, move(value), [](bool ok)
{
// TODO: Handle failure to put data
if(!ok)
fprintf(stderr, "Failed to put: %s, what to do?\n", "commitStagedCreateObject");
}, time_point(), false);
}
void Database::commitStagedAddObject(const StagedAddObject &stagedObject)
{
// TODO: Use (ed25519 or poly1305) and curve25519
// TODO: Implement gas and price (refill when serving content (seeding) or by waiting. This is done to prevent spamming and bandwidth leeching)
sibs::SafeSerializer serializer;
assert(stagedObject.key.hashedKey.size() == OPENDHT_INFOHASH_LEN);
serializer.add(stagedObject.key.hashedKey.data(), stagedObject.key.hashedKey.size());
serializer.add(stagedObject.timestamp);
serializer.add((u8*)stagedObject.data.data, stagedObject.data.size);
// TODO: Verify if serializer buffer needs to survive longer than this scope
Value value(serializer.getBuffer().data(), serializer.getBuffer().size());
node.put(ADD_DATA_HASH, move(value), [](bool ok)
{
// TODO: Handle failure to put data
if(!ok)
fprintf(stderr, "Failed to put: %s, what to do?\n", "commitStagedAddObject");
}, time_point(), false);
}
ntp::NtpTimestamp Database::getSyncedTimestampUtc() const
{
assert(timestampSynced);
ntp::NtpTimestamp timestamp;
timestamp.seconds = time(nullptr) - timeOffset;
timestamp.fractions = 0; // TODO: Set this
return timestamp;
}
StagedCreateObject Database::deserializeCreateRequest(const std::shared_ptr<dht::Value> &value)
{
StagedCreateObject result;
sibs::SafeDeserializer deserializer(value->data.data(), value->data.size());
u8 entryKeyRaw[OPENDHT_INFOHASH_LEN];
deserializer.extract(entryKeyRaw, OPENDHT_INFOHASH_LEN);
result.key.hashedKey = InfoHash(entryKeyRaw, OPENDHT_INFOHASH_LEN);
result.timestamp = deserializer.extract<u64>();
return result;
}
StagedAddObject Database::deserializeAddRequest(const std::shared_ptr<dht::Value> &value)
{
StagedAddObject result;
sibs::SafeDeserializer deserializer(value->data.data(), value->data.size());
u8 entryKeyRaw[OPENDHT_INFOHASH_LEN];
deserializer.extract(entryKeyRaw, OPENDHT_INFOHASH_LEN);
result.key.hashedKey = InfoHash(entryKeyRaw, OPENDHT_INFOHASH_LEN);
result.timestamp = deserializer.extract<u64>();
return result;
}
bool Database::listenCreateData(const std::vector<std::shared_ptr<dht::Value>> &values)
{
for(const shared_ptr<Value> &value : values)
{
try
{
StagedCreateObject createObject = deserializeCreateRequest(value);
}
catch (sibs::DeserializeException &e)
{
fprintf(stderr, "Warning: Failed to deserialize 'create' request: %s\n", e.what());
}
}
return true;
}
bool Database::listenAddData(const std::vector<std::shared_ptr<dht::Value>> &values)
{
for(const shared_ptr<Value> &value : values)
{
try
{
StagedAddObject addObject = deserializeAddRequest(value);
}
catch (sibs::DeserializeException &e)
{
fprintf(stderr, "Warning: Failed to deserialize 'add' request: %s\n", e.what());
}
}
return true;
}
}
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