public static void RouteForTableMeta(RouteResultset rrs,
SchemaConfig schema,
ISqlStatement ast,
PartitionKeyVisitor visitor,
string stmt)
{
var sql = stmt;
if (visitor.IsSchemaTrimmed())
{
sql = GenSql(ast, stmt);
}
var tables = visitor.GetMetaReadTable();
if (tables == null)
{
throw new ArgumentException(string.Format("route err: tables[] is null for meta read table: {0}",
stmt));
}
string[] dataNodes;
if (tables.Length <= 0)
{
dataNodes = schema.MetaDataNodes;
}
else
{
if (tables.Length == 1)
{
dataNodes = new string[1];
dataNodes[0] = GetMetaReadDataNode(schema, tables[0]);
}
else
{
ICollection <string> dataNodeSet = new HashSet <string>();
foreach (var table in tables)
{
var dataNode = GetMetaReadDataNode(schema, table);
dataNodeSet.Add(dataNode);
}
dataNodes = dataNodeSet.ToArray();
//dataNodes = new string[dataNodeSet.Count];
//IEnumerator<string> iter = dataNodeSet.GetEnumerator();
//for (int i = 0; i < dataNodes.Length; ++i)
//{
// dataNodes[i] = iter.Current;
//}
}
}
var nodes = new RouteResultsetNode[dataNodes.Length];
rrs.Nodes = nodes;
for (var i1 = 0; i1 < dataNodes.Length; ++i1)
{
nodes[i1] = new RouteResultsetNode(dataNodes[i1], sql);
}
}
private static void LogExplicitReplicaSet(object frontConn, string sql, RouteResultset rrs)
{
//LogExplicitReplicaSet
//if (frontConn != null && Logger.IsInfoEnabled())
//{
// StringBuilder s = new StringBuilder();
// s.Append(frontConn).Append("Explicit data node replica set from, sql=[");
// s.Append(sql).Append(']');
// Logger.Info(s.ToString());
//}
}
private static IDictionary<string, RouteResultsetNode> GetNodeMap(RouteResultset
rrs, int expectSize)
{
var routeNodes = rrs.Nodes;
Assert.AreEqual(expectSize, routeNodes.Length);
var nodeMap = new Dictionary<string, RouteResultsetNode>(expectSize);
for (var i = 0; i < expectSize; i++)
{
var routeNode = routeNodes[i];
nodeMap[routeNode.Name] = routeNode;
}
Assert.AreEqual(expectSize, nodeMap.Count);
return nodeMap;
}
private static void SetGroupFlagAndLimit(RouteResultset rrs, PartitionKeyVisitor visitor)
{
rrs.LimitSize = visitor.GetLimitSize();
switch (visitor.GetGroupFuncType())
{
case PartitionKeyVisitor.GroupSum:
{
rrs.Flag = RouteResultset.SumFlag;
break;
}
case PartitionKeyVisitor.GroupMax:
{
rrs.Flag = RouteResultset.MaxFlag;
break;
}
case PartitionKeyVisitor.GroupMin:
{
rrs.Flag = RouteResultset.MinFlag;
break;
}
}
}
/// <exception cref="System.SqlSyntaxErrorException" />
public static void RouteFromHint(object frontConn,
SchemaConfig schema,
RouteResultset rrs,
int prefixIndex,
string sql)
{
var hint = CobarHint.ParserCobarHint(sql, prefixIndex);
var outputSql = hint.OutputSql;
var replica = hint.Replica;
var table = hint.Table;
var dataNodes = hint.DataNodes;
var partitionOperand = hint.PartitionOperand;
TableConfig tableConfig = null;
if (table == null ||
schema.Tables == null ||
(tableConfig = schema.Tables.GetValue(table)) == null)
{
// table not indicated
var nodes = new RouteResultsetNode[1];
rrs.Nodes = nodes;
if (dataNodes != null && !dataNodes.IsEmpty())
{
var replicaIndex = dataNodes[0].Value;
if (replicaIndex >= 0 && RouteResultsetNode.DefaultReplicaIndex != replicaIndex)
{
// replica index indicated in dataNodes references
nodes[0] = new RouteResultsetNode(schema.DataNode, replicaIndex, outputSql);
LogExplicitReplicaSet(frontConn, sql, rrs);
return;
}
}
nodes[0] = new RouteResultsetNode(schema.DataNode, replica, outputSql);
if (replica != RouteResultsetNode.DefaultReplicaIndex)
{
LogExplicitReplicaSet(frontConn, sql, rrs);
}
return;
}
if (dataNodes != null && !dataNodes.IsEmpty())
{
var nodes = new RouteResultsetNode[dataNodes.Count];
rrs.Nodes = nodes;
var i = 0;
var replicaSet = false;
foreach (var pair in dataNodes)
{
var dataNodeName = tableConfig.DataNodes[pair.Key];
var replicaIndex = dataNodes[i].Value;
if (replicaIndex >= 0 && RouteResultsetNode.DefaultReplicaIndex != replicaIndex)
{
replicaSet = true;
nodes[i] = new RouteResultsetNode(dataNodeName, replicaIndex, outputSql);
}
else
{
replicaSet = replicaSet || (replica != RouteResultsetNode.DefaultReplicaIndex);
nodes[i] = new RouteResultsetNode(dataNodeName, replica, outputSql);
}
++i;
}
if (replicaSet)
{
LogExplicitReplicaSet(frontConn, sql, rrs);
}
return;
}
if (partitionOperand == null)
{
var tableDataNodes = tableConfig.DataNodes;
var nodes = new RouteResultsetNode[tableDataNodes.Length];
rrs.Nodes = nodes;
for (var i = 0; i < nodes.Length; ++i)
{
nodes[i] = new RouteResultsetNode(tableDataNodes[i], replica, outputSql);
}
return;
}
var cols = partitionOperand.Key;
var vals = partitionOperand.Value;
if (cols == null || vals == null)
{
throw new SqlSyntaxErrorException("${partitionOperand} is invalid: " + sql);
}
RuleConfig rule = null;
var tr = tableConfig.Rule;
var rules = tr == null ? null : tr.Rules;
if (rules != null)
{
foreach (var r in rules)
{
var ruleCols = r.Columns;
var match = true;
foreach (var ruleCol in ruleCols)
{
match &= cols.Contains(ruleCol);
}
if (match)
{
rule = r;
break;
}
}
}
var tableDataNodes1 = tableConfig.DataNodes;
if (rule == null)
{
var nodes = new RouteResultsetNode[tableDataNodes1.Length];
rrs.Nodes = nodes;
var replicaSet = false;
for (var i = 0; i < tableDataNodes1.Length; ++i)
{
replicaSet = replicaSet || (replica != RouteResultsetNode.DefaultReplicaIndex);
nodes[i] = new RouteResultsetNode(tableDataNodes1[i], replica, outputSql);
}
if (replicaSet)
{
LogExplicitReplicaSet(frontConn, sql, rrs);
}
return;
}
var destDataNodes = CalcHintDataNodes(rule, cols, vals, tableDataNodes1);
var nodes1 = new RouteResultsetNode[destDataNodes.Count];
rrs.Nodes = nodes1;
var i1 = 0;
var replicaSet1 = false;
foreach (var dataNode in destDataNodes)
{
replicaSet1 = replicaSet1 || (replica != RouteResultsetNode.DefaultReplicaIndex);
nodes1[i1++] = new RouteResultsetNode(dataNode, replica, outputSql);
}
if (replicaSet1)
{
LogExplicitReplicaSet(frontConn, sql, rrs);
}
}
//private static readonly Logger Logger = Logger.GetLogger(typeof(ServerRouter));
public static RouteResultset Route(SchemaConfig schema,
string stmt,
string charset,
object info)
{
var rrs = new RouteResultset(stmt);
// 检查是否含有cobar hint
var prefixIndex = HintRouter.IndexOfPrefix(stmt);
if (prefixIndex >= 0)
{
HintRouter.RouteFromHint(info, schema, rrs, prefixIndex, stmt);
return(rrs);
}
// 检查schema是否含有拆分库
if (schema.IsNoSharding)
{
if (schema.IsKeepSqlSchema)
{
var ast = SqlParserDelegate.Parse(stmt, charset ?? MySqlParser.DefaultCharset);
var visitor = new PartitionKeyVisitor(schema.Tables);
visitor.SetTrimSchema(schema.Name);
ast.Accept(visitor);
if (visitor.IsSchemaTrimmed())
{
stmt = GenSql(ast, stmt);
}
}
var nodes = new RouteResultsetNode[1];
nodes[0] = new RouteResultsetNode(schema.DataNode, stmt);
rrs.Nodes = nodes;
return(rrs);
}
// 生成和展开AST
var ast1 = SqlParserDelegate.Parse(stmt, charset ?? MySqlParser.DefaultCharset);
var visitor1 = new PartitionKeyVisitor(schema.Tables);
visitor1.SetTrimSchema(schema.IsKeepSqlSchema ? schema.Name : null);
ast1.Accept(visitor1);
// 如果sql包含用户自定义的schema，则路由到default节点
if (schema.IsKeepSqlSchema && visitor1.IsCustomedSchema())
{
if (visitor1.IsSchemaTrimmed())
{
stmt = GenSql(ast1, stmt);
}
var nodes = new RouteResultsetNode[1];
nodes[0] = new RouteResultsetNode(schema.DataNode, stmt);
rrs.Nodes = nodes;
return(rrs);
}
// 元数据语句路由
if (visitor1.IsTableMetaRead())
{
MetaRouter.RouteForTableMeta(rrs, schema, ast1, visitor1, stmt);
if (visitor1.IsNeedRewriteField())
{
rrs.Flag = RouteResultset.RewriteField;
}
return(rrs);
}
// 匹配规则
TableConfig matchedTable = null;
RuleConfig rule = null;
IDictionary <string, IList <object> > columnValues = null;
var astExt = visitor1.GetColumnValue();
var tables = schema.Tables;
foreach (var e in astExt)
{
var col2Val = e.Value;
var tc = tables.GetValue(e.Key);
if (tc == null)
{
continue;
}
if (matchedTable == null)
{
matchedTable = tc;
}
if (col2Val == null || col2Val.IsEmpty())
{
continue;
}
var tr = tc.Rule;
if (tr != null)
{
foreach (var rc in tr.Rules)
{
var match = true;
foreach (var ruleColumn in rc.Columns)
{
match &= col2Val.ContainsKey(ruleColumn);
}
if (match)
{
columnValues = col2Val;
rule = rc;
matchedTable = tc;
goto ft_break;
}
}
}
}
ft_break:
;
// 规则匹配处理，表级别和列级别。
if (matchedTable == null)
{
var sql = visitor1.IsSchemaTrimmed() ? GenSql(ast1, stmt) : stmt;
var rn = new RouteResultsetNode[1];
if (string.Empty.Equals(schema.DataNode) && IsSystemReadSql(ast1))
{
rn[0] = new RouteResultsetNode(schema.RandomDataNode, sql);
}
else
{
rn[0] = new RouteResultsetNode(schema.DataNode, sql);
}
rrs.Nodes = rn;
return(rrs);
}
if (rule == null)
{
if (matchedTable.IsRuleRequired)
{
throw new ArgumentException(string.Format("route rule for table {0} is required: {1}",
matchedTable.Name, stmt));
}
var dataNodes = matchedTable.DataNodes;
var sql = visitor1.IsSchemaTrimmed() ? GenSql(ast1, stmt) : stmt;
var rn = new RouteResultsetNode[dataNodes.Length];
for (var i = 0; i < dataNodes.Length; ++i)
{
rn[i] = new RouteResultsetNode(dataNodes[i], sql);
}
rrs.Nodes = rn;
SetGroupFlagAndLimit(rrs, visitor1);
return(rrs);
}
// 规则计算
ValidateAst(ast1, matchedTable, rule, visitor1);
var dnMap = RuleCalculate(matchedTable, rule, columnValues);
if (dnMap == null || dnMap.IsEmpty())
{
throw new ArgumentException("No target dataNode for rule " + rule);
}
// 判断路由结果是单库还是多库
if (dnMap.Count == 1)
{
var dataNode = matchedTable.DataNodes[dnMap.Keys.FirstOrDefault()];
//string dataNode = matchedTable.GetDataNodes()[dnMap.Keys.GetEnumerator().Current];
var sql = visitor1.IsSchemaTrimmed() ? GenSql(ast1, stmt) : stmt;
var rn = new RouteResultsetNode[1];
rn[0] = new RouteResultsetNode(dataNode, sql);
rrs.Nodes = rn;
}
else
{
var rn = new RouteResultsetNode[dnMap.Count];
if (ast1 is DmlInsertReplaceStatement)
{
var ir = (DmlInsertReplaceStatement)ast1;
DispatchInsertReplace(rn, ir, rule.Columns, dnMap, matchedTable, stmt, visitor1);
}
else
{
DispatchWhereBasedStmt(rn, ast1, rule.Columns, dnMap, matchedTable, stmt, visitor1);
}
rrs.Nodes = rn;
SetGroupFlagAndLimit(rrs, visitor1);
}
return(rrs);
}
