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CDClientSnapshot converts a copy of the client's fdb into its own CDServer-<hash>.sqlite with the cdserver migrations applied, on its own connection. CDClientDatabase::Reconnect opens the new file before letting go of the old one; CDClientManager::Reload empties every table (old entries kept alive so references from spawned objects stay valid), retires the old fdb view and loads again. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
#ifndef CDCLIENTSNAPSHOT_H
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#define CDCLIENTSNAPSHOT_H
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#include <cstdint>
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#include <filesystem>
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#include <optional>
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#include <string>
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#include <vector>
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#include "FdbSnapshot.h"
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/**
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* Makes a new copy of the client's cdclient.fdb and the CDServer.sqlite that goes with it (see FdbSnapshot.h).
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*
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* Everything here uses its own files and SQLite connection and never logs, so master runs it on a worker thread and
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* logs the result on the main thread.
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*/
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namespace CDClientSnapshot {
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struct Result {
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bool ok = false;
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// The copy has the same bytes as the current one; nothing to do
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bool unchanged = false;
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std::string error;
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uint64_t hash = 0;
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FdbSnapshot::Current current;
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// What the new fdb changed, one line per table (FdbSnapshot::DescribeChanges)
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std::vector<std::string> changes;
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// The cdserver migrations applied to the new CDServer.sqlite
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std::vector<std::string> migrations;
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};
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/**
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* Converts fdb into a new SQLite file at out and applies every cdserver migration in migrationsDir to it. It is
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* written under a temporary name and renamed to out when complete.
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*/
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bool MakeSqlite(const std::filesystem::path& fdb, const std::filesystem::path& out, const std::filesystem::path& migrationsDir,
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std::vector<std::string>& migrations, std::string& error);
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/**
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* Copies clientFdb into resServer and, if it differs from currentHash, makes its CDServer-<hash>.sqlite.
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*
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* @param previousFdb The copy in use now, compared with the new one for Result::changes (may be empty)
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*/
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Result Build(const std::filesystem::path& clientFdb, const std::filesystem::path& resServer, const std::filesystem::path& migrationsDir,
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std::optional<uint64_t> currentHash, const std::filesystem::path& previousFdb);
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};
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#endif // CDCLIENTSNAPSHOT_H
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