internal Task WriteClose(StatementOrPortal type, string name, bool async, CancellationToken cancellationToken = default)
{
var len = sizeof(byte) + // Message code
sizeof(int) + // Length
sizeof(byte) + // Statement or portal
name.Length + sizeof(byte); // Statement or portal name plus null terminator
if (WriteBuffer.WriteSpaceLeft < 10)
{
return(FlushAndWrite(len, type, name, async, cancellationToken));
}
Write(len, type, name);
return(Task.CompletedTask);
async Task FlushAndWrite(int len, StatementOrPortal type, string name, bool async, CancellationToken cancellationToken)
{
await Flush(async, cancellationToken);
Debug.Assert(len <= WriteBuffer.WriteSpaceLeft, $"Message of type {GetType().Name} has length {len} which is bigger than the buffer ({WriteBuffer.WriteSpaceLeft})");
Write(len, type, name);
}
void Write(int len, StatementOrPortal type, string name)
{
WriteBuffer.WriteByte(FrontendMessageCode.Close);
WriteBuffer.WriteInt32(len - 1);
WriteBuffer.WriteByte((byte)type);
WriteBuffer.WriteNullTerminatedString(name);
}
}
internal Task WriteDescribe(StatementOrPortal statementOrPortal, string name, bool async)
{
Debug.Assert(name.All(c => c < 128));
var len = sizeof(byte) + // Message code
sizeof(int) + // Length
sizeof(byte) + // Statement or portal
(name.Length + 1); // Statement/portal name
if (WriteBuffer.WriteSpaceLeft < len)
{
return(FlushAndWrite(len, statementOrPortal, name, async));
}
Write(len, statementOrPortal, name);
return(Task.CompletedTask);
async Task FlushAndWrite(int len, StatementOrPortal statementOrPortal, string name, bool async)
{
await Flush(async);
Debug.Assert(len <= WriteBuffer.WriteSpaceLeft, $"Message of type {GetType().Name} has length {len} which is bigger than the buffer ({WriteBuffer.WriteSpaceLeft})");
Write(len, statementOrPortal, name);
}
void Write(int len, StatementOrPortal statementOrPortal, string name)
{
WriteBuffer.WriteByte(FrontendMessageCode.Describe);
WriteBuffer.WriteInt32(len - 1);
WriteBuffer.WriteByte((byte)statementOrPortal);
WriteBuffer.WriteNullTerminatedString(name);
}
}
internal CloseMessage(StatementOrPortal type, string name="")
{
StatementOrPortal = type;
Name = name;
}
internal CloseMessage(StatementOrPortal type, string name = "")
{
StatementOrPortal = type;
Name = name;
}
internal DescribeMessage Populate(StatementOrPortal type, string name = null)
{
StatementOrPortal = type;
Name = name ?? "";
return this;
}
internal DescribeMessage Populate(StatementOrPortal type, string name = null)
{
StatementOrPortal = type;
Name = name ?? "";
return(this);
}
internal CloseMessage Populate(StatementOrPortal type, string name = "")
{
StatementOrPortal = type;
Name = name;
return(this);
}