| private WriteString ( string s, int len ) : void | ||
| s | string | |
| len | int | |
| return | void | |
internal async Task WriteSASLInitialResponse(string mechanism, byte[] initialResponse, bool async)
{
var len = sizeof(byte) + // Message code
sizeof(int) + // Length
PGUtil.UTF8Encoding.GetByteCount(mechanism) + sizeof(byte) + // Mechanism plus null terminator
sizeof(int) + // Initial response length
(initialResponse?.Length ?? 0); // Initial response payload
if (WriteBuffer.WriteSpaceLeft < len)
{
await WriteBuffer.Flush(async);
}
WriteBuffer.WriteByte(FrontendMessageCode.Password);
WriteBuffer.WriteInt32(len - 1);
WriteBuffer.WriteString(mechanism);
WriteBuffer.WriteByte(0); // null terminator
if (initialResponse == null)
{
WriteBuffer.WriteInt32(-1);
}
else
{
WriteBuffer.WriteInt32(initialResponse.Length);
WriteBuffer.WriteBytes(initialResponse);
}
}
internal void WriteStartup(Dictionary <string, string> parameters)
{
const int protocolVersion3 = 3 << 16; // 196608
var len = sizeof(int) + // Length
sizeof(int) + // Protocol version
sizeof(byte); // Trailing zero byte
foreach (var kvp in parameters)
{
len += PGUtil.UTF8Encoding.GetByteCount(kvp.Key) + 1 +
PGUtil.UTF8Encoding.GetByteCount(kvp.Value) + 1;
}
// Should really never happen, just in case
if (len > WriteBuffer.Size)
{
throw new Exception("Startup message bigger than buffer");
}
WriteBuffer.WriteInt32(len);
WriteBuffer.WriteInt32(protocolVersion3);
foreach (var kv in parameters)
{
WriteBuffer.WriteString(kv.Key);
WriteBuffer.WriteByte(0);
WriteBuffer.WriteString(kv.Value);
WriteBuffer.WriteByte(0);
}
WriteBuffer.WriteByte(0);
}
internal async Task WriteParse(string sql, string statementName, List <NpgsqlParameter> inputParameters, bool async)
{
Debug.Assert(statementName.All(c => c < 128));
int queryByteLen;
try
{
queryByteLen = TextEncoding.GetByteCount(sql);
}
catch (Exception e)
{
Break(e);
throw;
}
if (WriteBuffer.WriteSpaceLeft < 1 + 4 + statementName.Length + 1)
{
await Flush(async);
}
var messageLength =
sizeof(byte) + // Message code
sizeof(int) + // Length
statementName.Length + // Statement name
sizeof(byte) + // Null terminator for the statement name
queryByteLen + sizeof(byte) + // SQL query length plus null terminator
sizeof(ushort) + // Number of parameters
inputParameters.Count * sizeof(int); // Parameter OIDs
WriteBuffer.WriteByte(FrontendMessageCode.Parse);
WriteBuffer.WriteInt32(messageLength - 1);
WriteBuffer.WriteNullTerminatedString(statementName);
await WriteBuffer.WriteString(sql, queryByteLen, async);
if (WriteBuffer.WriteSpaceLeft < 1 + 2)
{
await Flush(async);
}
WriteBuffer.WriteByte(0); // Null terminator for the query
WriteBuffer.WriteUInt16((ushort)inputParameters.Count);
foreach (var p in inputParameters)
{
if (WriteBuffer.WriteSpaceLeft < 4)
{
await Flush(async);
}
WriteBuffer.WriteInt32((int)p.Handler !.PostgresType.OID);
}
}
internal async Task WriteQuery(string sql, bool async)
{
var queryByteLen = TextEncoding.GetByteCount(sql);
if (WriteBuffer.WriteSpaceLeft < 1 + 4)
{
await Flush(async);
}
WriteBuffer.WriteByte(FrontendMessageCode.Query);
WriteBuffer.WriteInt32(
sizeof(int) + // Message length (including self excluding code)
queryByteLen + // Query byte length
sizeof(byte)); // Null terminator
await WriteBuffer.WriteString(sql, queryByteLen, async);
if (WriteBuffer.WriteSpaceLeft < 1)
{
await Flush(async);
}
WriteBuffer.WriteByte(0); // Null terminator
}