From 272e31188d9b76bc4680fccf3502e459c89d5956 Mon Sep 17 00:00:00 2001
From: Val <valeryxbaturin@gmail.com>
Date: Sun, 5 Apr 2020 16:06:21 +0300
Subject: [PATCH] databasereplicated add table functions prototype

---
 dbms/src/Databases/DatabaseReplicated.cpp | 156 ++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 dbms/src/Databases/DatabaseReplicated.cpp

diff --git a/dbms/src/Databases/DatabaseReplicated.cpp b/dbms/src/Databases/DatabaseReplicated.cpp
new file mode 100644
index 00000000000..704c678f366
--- /dev/null
+++ b/dbms/src/Databases/DatabaseReplicated.cpp
@@ -0,0 +1,156 @@
+#include <iomanip>
+
+#include <Core/Settings.h>
+#include <Databases/DatabaseOnDisk.h>
+#include <Databases/DatabaseReplicated.h>
+#include <Databases/DatabasesCommon.h>
+#include <IO/ReadBufferFromFile.h>
+#include <IO/ReadHelpers.h>
+#include <IO/WriteBufferFromFile.h>
+#include <IO/WriteHelpers.h>
+#include <Interpreters/Context.h>
+#include <Interpreters/InterpreterCreateQuery.h>
+#include <Parsers/ASTCreateQuery.h>
+#include <Parsers/ASTSetQuery.h>
+#include <Parsers/ParserCreateQuery.h>
+#include <Parsers/formatAST.h>
+#include <Parsers/parseQuery.h>
+#include <Storages/StorageFactory.h>
+#include <TableFunctions/TableFunctionFactory.h>
+
+#include <Parsers/queryToString.h>
+
+#include <Poco/DirectoryIterator.h>
+#include <Poco/Event.h>
+#include <Common/Stopwatch.h>
+#include <Common/ThreadPool.h>
+#include <Common/escapeForFileName.h>
+#include <Common/quoteString.h>
+#include <Common/typeid_cast.h>
+#include <common/logger_useful.h>
+
+#include <Common/ZooKeeper/KeeperException.h>
+#include <Common/ZooKeeper/Types.h>
+#include <Common/ZooKeeper/ZooKeeper.h>
+
+#include <ext/scope_guard.h>
+
+namespace DB
+{
+
+
+namespace ErrorCodes
+{
+    extern const int NO_ZOOKEEPER;
+}
+
+void DatabaseReplicated::setZooKeeper(zkutil::ZooKeeperPtr zookeeper)
+{
+    std::lock_guard lock(current_zookeeper_mutex);
+    current_zookeeper = zookeeper;
+}
+
+zkutil::ZooKeeperPtr DatabaseReplicated::tryGetZooKeeper() const
+{
+    std::lock_guard lock(current_zookeeper_mutex);
+    return current_zookeeper;
+}
+
+zkutil::ZooKeeperPtr DatabaseReplicated::getZooKeeper() const
+{
+    auto res = tryGetZooKeeper();
+    if (!res)
+        throw Exception("Cannot get ZooKeeper", ErrorCodes::NO_ZOOKEEPER);
+    return res;
+}
+
+
+DatabaseReplicated::DatabaseReplicated(
+    const String & name_,
+    const String & metadata_path_,
+    const String & zookeeper_path_,
+    const String & replica_name_,
+    const Context & context_)
+    : DatabaseOrdinary(name_, metadata_path_, context_)
+    , zookeeper_path(zookeeper_path_)
+    , replica_name(replica_name_)
+{
+
+    if (!zookeeper_path.empty() && zookeeper_path.back() == '/')
+        zookeeper_path.resize(zookeeper_path.size() - 1);
+    /// If zookeeper chroot prefix is used, path should start with '/', because chroot concatenates without it.
+    if (!zookeeper_path.empty() && zookeeper_path.front() != '/')
+        zookeeper_path = "/" + zookeeper_path;
+    replica_path = zookeeper_path + "/replicas/" + replica_name;
+
+    if (context_.hasZooKeeper()) {
+        current_zookeeper = context_.getZooKeeper();
+    }
+
+    if (!current_zookeeper)
+    {
+        // TODO wtf is attach
+        // if (!attach)
+            throw Exception("Can't create replicated table without ZooKeeper", ErrorCodes::NO_ZOOKEEPER);
+
+        /// Do not activate the replica. It will be readonly.
+        // TODO is it relevant for engines?
+        // LOG_ERROR(log, "No ZooKeeper: database will be in readonly mode.");
+        // TODO is_readonly = true;
+        // return;
+    }
+    // getObjectDefinitionFromCreateQuery
+    // TODO what to do?
+    // TODO createDatabaseIfNotExists ?
+    // TODO check database structure ?
+}
+
+void DatabaseReplicated::createTable(
+    const Context & context,
+    const String & table_name,
+    const StoragePtr & table,
+    const ASTPtr & query)
+{
+    // try
+    DatabaseOnDisk::createTable(context, table_name, table, query);
+    // replicated stuff
+    String statement = getObjectDefinitionFromCreateQuery(query);
+    // ...
+
+}
+
+
+void DatabaseReplicated::renameTable(
+        const Context & context,
+        const String & table_name,
+        IDatabase & to_database,
+        const String & to_table_name,
+        TableStructureWriteLockHolder & lock)
+{
+    // try
+    DatabaseOnDisk::renameTable(context, table_name, to_database, to_table_name, lock);
+    // replicated stuff
+    String statement = getObjectDefinitionFromCreateQuery(query);
+    // ...
+}
+
+void DatabaseReplicated::removeTable(
+        const Context & context,
+        const String & table_name)
+{
+    // try
+    DatabaseOnDisk::removeTable(context, table_name);
+    // replicated stuff
+    String statement = getObjectDefinitionFromCreateQuery(query);
+    // ...
+}
+
+void DatabaseReplicated::drop(const Context & context)
+{
+    DatabaseOnDisk::drop(context);
+    // replicated stuff
+    String statement = getObjectDefinitionFromCreateQuery(query);
+    // ...
+}
+
+}