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GeneratedAsync.cs
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2328 lines (2152 loc) · 96 KB
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#pragma warning disable
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Net.Sockets;
using JetBrains.Annotations;
using Npgsql.BackendMessages;
using Npgsql.FrontendMessages;
using Npgsql.Logging;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Diagnostics.Contracts;
using System.IO;
using System.Net.Security;
using System.Net.Sockets;
using System.Reflection;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;
using JetBrains.Annotations;
#if NET45 || NET451
using System.Transactions;
#endif
using Npgsql.Logging;
using NpgsqlTypes;
using IsolationLevel = System.Data.IsolationLevel;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Runtime.CompilerServices;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;
using JetBrains.Annotations;
using Npgsql.BackendMessages;
using Npgsql.FrontendMessages;
using Npgsql.Logging;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data;
using System.Data.Common;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
using JetBrains.Annotations;
using Npgsql.BackendMessages;
using Npgsql.FrontendMessages;
using Npgsql.Logging;
using Npgsql.Schema;
using Npgsql.TypeHandlers;
using Npgsql.TypeHandlers.NumericHandlers;
using NpgsqlTypes;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using Npgsql.FrontendMessages;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using Npgsql.FrontendMessages;
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Data;
using System.Data.Common;
using System.Diagnostics.Contracts;
using System.Threading;
using System.Threading.Tasks;
using JetBrains.Annotations;
using Npgsql.BackendMessages;
using Npgsql.FrontendMessages;
using Npgsql.Logging;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.IO;
using System.Net;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Npgsql.Logging;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Diagnostics.Contracts;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Text;
using JetBrains.Annotations;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Diagnostics.Contracts;
using System.IO;
using Npgsql.BackendMessages;
using NpgsqlTypes;
using System.Threading;
using System.Threading.Tasks;
using JetBrains.Annotations;
using Npgsql.TypeHandlers;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Diagnostics.Contracts;
using JetBrains.Annotations;
using Npgsql.Logging;
using Npgsql.TypeHandlers;
using NpgsqlTypes;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Diagnostics.Contracts;
using System.IO;
using System.Net;
using System.Runtime.InteropServices;
using System.Text;
using JetBrains.Annotations;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Npgsql;
using Npgsql.TypeHandlers;
using System.Threading;
using System.Threading.Tasks;
#pragma warning disable
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Sockets;
using System.Numerics;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Npgsql
{
public sealed partial class NpgsqlCommand
{
async Task<NpgsqlDataReader> ExecuteAsync(CancellationToken cancellationToken, CommandBehavior behavior = CommandBehavior.Default)
{
Validate();
if (!IsPrepared)
ProcessRawQuery();
LogCommand();
State = CommandState.InProgress;
try
{
_connector = Connection.Connector;
// If a cancellation is in progress, wait for it to "complete" before proceeding (#615)
lock (_connector.CancelLock)
{
}
// Send protocol messages for the command
// Unless this is a prepared SchemaOnly command, in which case we already have the RowDescriptions
// from the Prepare phase (no need to send anything).
if (!IsPrepared || (behavior & CommandBehavior.SchemaOnly) == 0)
{
_connector.UserTimeout = CommandTimeout * 1000;
_sendState = SendState.Start;
_writeStatementIndex = 0;
if (IsPrepared)
await SendAsync(PopulateExecutePrepared, cancellationToken).ConfigureAwait(false);
else if ((behavior & CommandBehavior.SchemaOnly) == 0)
await SendAsync(PopulateExecuteNonPrepared, cancellationToken).ConfigureAwait(false);
else
await SendAsync(PopulateExecuteSchemaOnly, cancellationToken).ConfigureAwait(false);
}
var reader = new NpgsqlDataReader(this, behavior, _statements);
await reader.NextResultAsync(cancellationToken).ConfigureAwait(false);
_connector.CurrentReader = reader;
return reader;
}
catch
{
State = CommandState.Idle;
throw;
}
}
async Task SendAsync(PopulateMethod populateMethod, CancellationToken cancellationToken)
{
while (true)
{
var directBuf = new DirectBuffer();
var completed = populateMethod(ref directBuf);
await _connector.SendBufferAsync(cancellationToken).ConfigureAwait(false);
if (completed)
break; // Sent all messages
// The following is an optimization hack for writing large byte arrays without passing
// through our buffer
if (directBuf.Buffer != null)
{
await _connector.WriteBuffer.DirectWriteAsync(directBuf.Buffer, directBuf.Offset, directBuf.Size == 0 ? directBuf.Buffer.Length : directBuf.Size, cancellationToken).ConfigureAwait(false);
directBuf.Buffer = null;
directBuf.Size = 0;
}
if (_writeStatementIndex > 0)
{
// We've send all the messages for the first statement in a multistatement command.
// If we continue blocking writes for the rest of the messages, we risk a deadlock where
// PostgreSQL sends large results for the first statement, while we're sending large
// parameter data for the second. To avoid this, switch to async sends.
// See #641
RemainingSendTask = SendRemaining(populateMethod, CancellationToken.None);
return;
}
}
}
async Task<int> ExecuteNonQueryInternalAsync(CancellationToken cancellationToken)
{
var connector = CheckReadyAndGetConnector();
using (connector.StartUserAction())
{
Log.Trace("ExecuteNonQuery", connector.Id);
NpgsqlDataReader reader;
using (reader = await (ExecuteAsync(cancellationToken).ConfigureAwait(false)))
{
while (await reader.NextResultAsync(cancellationToken).ConfigureAwait(false))
{
}
}
return reader.RecordsAffected;
}
}
async Task<object> ExecuteScalarInternalAsync(CancellationToken cancellationToken)
{
var connector = CheckReadyAndGetConnector();
using (connector.StartUserAction())
{
Log.Trace("ExecuteNonScalar", connector.Id);
using (var reader = Execute(CommandBehavior.SequentialAccess | CommandBehavior.SingleRow))
return await (reader.ReadAsync(cancellationToken).ConfigureAwait(false)) && reader.FieldCount != 0 ? reader.GetValue(0) : null;
}
}
async Task<NpgsqlDataReader> ExecuteDbDataReaderInternalAsync(CommandBehavior behavior, CancellationToken cancellationToken)
{
var connector = CheckReadyAndGetConnector();
connector.StartUserAction();
try
{
Log.Trace("ExecuteReader", connector.Id);
return await ExecuteAsync(cancellationToken, behavior).ConfigureAwait(false);
}
catch
{
Connection.Connector?.EndUserAction();
// Close connection if requested even when there is an error.
if ((behavior & CommandBehavior.CloseConnection) == CommandBehavior.CloseConnection)
_connection.Close();
throw;
}
}
}
public sealed partial class NpgsqlConnection
{
async Task OpenInternalAsync(CancellationToken cancellationToken)
{
if (string.IsNullOrWhiteSpace(Host))
throw new ArgumentException("Host can't be null");
Contract.EndContractBlock();
var timeout = new NpgsqlTimeout(TimeSpan.FromSeconds(ConnectionTimeout));
// If we're postponing a close (see doc on this variable), the connection is already
// open and can be silently reused
if (_postponingClose)
return;
CheckConnectionClosed();
Log.Trace("Opening connnection");
// Copy the password aside and remove it from the user-provided connection string
// (unless PersistSecurityInfo has been requested). Note that cloned connections already
// have Password populated and should not be overwritten.
if (Password == null)
{
Password = Settings.Password;
}
if (!Settings.PersistSecurityInfo)
{
Settings.Password = null;
_connectionString = Settings.ToString();
}
_wasBroken = false;
try
{
// Get a Connector, either from the pool or creating one ourselves.
if (Settings.Pooling)
{
Connector = await (PoolManager.GetOrAdd(Settings).AllocateAsync(this, timeout, cancellationToken).ConfigureAwait(false));
// Since this pooled connector was opened, global enum/composite mappings may have
// changed. Bring this up to date if needed.
Connector.TypeHandlerRegistry.ActivateGlobalMappings();
}
else
{
Connector = new NpgsqlConnector(this);
await Connector.OpenAsync(timeout, cancellationToken).ConfigureAwait(false);
}
Connector.Notice += _noticeDelegate;
Connector.Notification += _notificationDelegate;
#if NET45 || NET451
if (Settings.Enlist)
{
Promotable.Enlist(Transaction.Current);
}
#endif
}
catch
{
Connector = null;
throw;
}
OpenCounter++;
OnStateChange(new StateChangeEventArgs(ConnectionState.Closed, ConnectionState.Open));
}
}
/// <summary>
/// Represents a connection to a PostgreSQL backend. Unlike NpgsqlConnection objects, which are
/// exposed to users, connectors are internal to Npgsql and are recycled by the connection pool.
/// </summary>
internal partial class NpgsqlConnector
{
internal async Task OpenAsync(NpgsqlTimeout timeout, CancellationToken cancellationToken)
{
Contract.Requires(Connection != null && Connection.Connector == this);
Contract.Requires(State == ConnectorState.Closed);
State = ConnectorState.Connecting;
try
{
await RawOpenAsync(timeout, cancellationToken).ConfigureAwait(false);
var username = GetUsername();
WriteStartupMessage(username);
await WriteBuffer.FlushAsync(cancellationToken).ConfigureAwait(false);
timeout.Check();
await HandleAuthenticationAsync(username, timeout, cancellationToken).ConfigureAwait(false);
await TypeHandlerRegistry.SetupAsync(this, timeout, cancellationToken).ConfigureAwait(false);
Log.Debug($"Opened connection to {Host}:{Port}", Id);
}
catch
{
Break();
throw;
}
}
async Task RawOpenAsync(NpgsqlTimeout timeout, CancellationToken cancellationToken)
{
try
{
await ConnectAsync(timeout, cancellationToken).ConfigureAwait(false);
Contract.Assert(_socket != null);
_baseStream = new NetworkStream(_socket, true);
_stream = _baseStream;
ReadBuffer = new ReadBuffer(this, _stream, BufferSize, PGUtil.UTF8Encoding);
WriteBuffer = new WriteBuffer(this, _stream, BufferSize, PGUtil.UTF8Encoding);
if (SslMode == SslMode.Require || SslMode == SslMode.Prefer)
{
Log.Trace("Attempting SSL negotiation");
SSLRequestMessage.Instance.WriteFully(WriteBuffer);
await WriteBuffer.FlushAsync(cancellationToken).ConfigureAwait(false);
await ReadBuffer.EnsureAsync(1, cancellationToken).ConfigureAwait(false);
var response = (char)ReadBuffer.ReadByte();
timeout.Check();
switch (response)
{
default:
throw new NpgsqlException($"Received unknown response {response} for SSLRequest (expecting S or N)");
case 'N':
if (SslMode == SslMode.Require)
{
throw new NpgsqlException("SSL connection requested. No SSL enabled connection from this host is configured.");
}
break;
case 'S':
var clientCertificates = new X509CertificateCollection();
Connection.ProvideClientCertificatesCallback?.Invoke(clientCertificates);
RemoteCertificateValidationCallback certificateValidationCallback;
if (_settings.TrustServerCertificate)
certificateValidationCallback = (sender, certificate, chain, errors) => true;
else if (Connection.UserCertificateValidationCallback != null)
certificateValidationCallback = Connection.UserCertificateValidationCallback;
else
certificateValidationCallback = DefaultUserCertificateValidationCallback;
if (!UseSslStream)
{
var sslStream = new TlsClientStream.TlsClientStream(_stream);
sslStream.PerformInitialHandshake(Host, clientCertificates, certificateValidationCallback, false);
_stream = sslStream;
}
else
{
var sslStream = new SslStream(_stream, false, certificateValidationCallback);
#if NETSTANDARD1_3
// CoreCLR removed sync methods from SslStream, see https://github.com/dotnet/corefx/pull/4868.
// Consider exactly what to do here.
sslStream.AuthenticateAsClientAsync(Host, clientCertificates, SslProtocols.Tls | SslProtocols.Tls11 | SslProtocols.Tls12, false).Wait();
#else
sslStream.AuthenticateAsClient(Host, clientCertificates, SslProtocols.Tls | SslProtocols.Tls11 | SslProtocols.Tls12, false);
#endif
_stream = sslStream;
}
timeout.Check();
ReadBuffer.Underlying = _stream;
WriteBuffer.Underlying = _stream;
IsSecure = true;
Log.Trace("SSL negotiation successful");
break;
}
}
Log.Trace($"Socket connected to {Host}:{Port}");
}
catch
{
try
{
_stream?.Dispose();
}
catch
{
// ignored
}
_stream = null;
try
{
_baseStream?.Dispose();
}
catch
{
// ignored
}
_baseStream = null;
try
{
_socket?.Dispose();
}
catch
{
// ignored
}
_socket = null;
throw;
}
}
async Task HandleAuthenticationAsync(string username, NpgsqlTimeout timeout, CancellationToken cancellationToken)
{
Log.Trace("Authenticating...", Id);
while (true)
{
var msg = await (ReadMessageAsync(DataRowLoadingMode.NonSequential, cancellationToken).ConfigureAwait(false));
timeout.Check();
switch (msg.Code)
{
case BackendMessageCode.AuthenticationRequest:
var passwordMessage = ProcessAuthenticationMessage(username, (AuthenticationRequestMessage)msg);
if (passwordMessage != null)
{
passwordMessage.WriteFully(WriteBuffer);
await WriteBuffer.FlushAsync(cancellationToken).ConfigureAwait(false);
timeout.Check();
}
continue;
case BackendMessageCode.BackendKeyData:
var backendKeyDataMsg = (BackendKeyDataMessage)msg;
BackendProcessId = backendKeyDataMsg.BackendProcessId;
_backendSecretKey = backendKeyDataMsg.BackendSecretKey;
continue;
case BackendMessageCode.ReadyForQuery:
State = ConnectorState.Ready;
return;
default:
throw new NpgsqlException("Unexpected message received while authenticating: " + msg.Code);
}
}
}
internal async Task SendMessageAsync(FrontendMessage msg, CancellationToken cancellationToken)
{
Log.Trace($"Sending: {msg}", Id);
while (true)
{
var completed = msg.Write(WriteBuffer);
await SendBufferAsync(cancellationToken).ConfigureAwait(false);
if (completed)
break; // Sent all messages
}
}
internal async Task SendBufferAsync(CancellationToken cancellationToken)
{
try
{
await WriteBuffer.FlushAsync(cancellationToken).ConfigureAwait(false);
}
catch
{
Break();
throw;
}
}
async Task<IBackendMessage> ReadMessageWithPrependedAsync(CancellationToken cancellationToken, DataRowLoadingMode dataRowLoadingMode = DataRowLoadingMode.NonSequential)
{
// First read the responses of any prepended messages.
// Exceptions shouldn't happen here, we break the connector if they do
if (_pendingRfqPrependedMessages > 0)
{
try
{
ReceiveTimeout = InternalCommandTimeout;
while (_pendingRfqPrependedMessages > 0)
{
var msg = await (DoReadMessageAsync(cancellationToken, DataRowLoadingMode.Skip, true).ConfigureAwait(false));
if (msg is ReadyForQueryMessage)
{
_pendingRfqPrependedMessages--;
}
}
}
catch (PostgresException)
{
Break();
throw;
}
}
// Now read a non-prepended message
try
{
ReceiveTimeout = UserTimeout;
return await DoReadMessageAsync(cancellationToken, dataRowLoadingMode).ConfigureAwait(false);
}
catch (PostgresException)
{
if (CurrentReader != null)
{
// The reader cleanup will call EndUserAction
CurrentReader.Cleanup();
}
else
{
EndUserAction();
}
throw;
}
}
async Task<IBackendMessage> DoReadMessageAsync(CancellationToken cancellationToken, DataRowLoadingMode dataRowLoadingMode = DataRowLoadingMode.NonSequential, bool isPrependedMessage = false)
{
PostgresException error = null;
while (true)
{
var buf = ReadBuffer;
await ReadBuffer.EnsureAsync(5, cancellationToken).ConfigureAwait(false);
var messageCode = (BackendMessageCode)ReadBuffer.ReadByte();
Contract.Assume(Enum.IsDefined(typeof (BackendMessageCode), messageCode), "Unknown message code: " + messageCode);
var len = ReadBuffer.ReadInt32() - 4; // Transmitted length includes itself
if ((messageCode == BackendMessageCode.DataRow && dataRowLoadingMode != DataRowLoadingMode.NonSequential) || messageCode == BackendMessageCode.CopyData)
{
if (dataRowLoadingMode == DataRowLoadingMode.Skip)
{
await ReadBuffer.SkipAsync(len, cancellationToken).ConfigureAwait(false);
continue;
}
}
else if (len > ReadBuffer.ReadBytesLeft)
{
buf = await (buf.EnsureOrAllocateTempAsync(len, cancellationToken).ConfigureAwait(false));
}
var msg = ParseServerMessage(buf, messageCode, len, dataRowLoadingMode, isPrependedMessage);
switch (messageCode)
{
case BackendMessageCode.ErrorResponse:
Contract.Assert(msg == null);
// An ErrorResponse is (almost) always followed by a ReadyForQuery. Save the error
// and throw it as an exception when the ReadyForQuery is received (next).
error = new PostgresException(buf);
if (State == ConnectorState.Connecting)
{
// During the startup/authentication phase, an ErrorResponse isn't followed by
// an RFQ. Instead, the server closes the connection immediately
throw error;
}
continue;
case BackendMessageCode.ReadyForQuery:
if (error != null)
{
throw error;
}
break;
// Asynchronous messages which can come anytime, they have already been handled
// in ParseServerMessage. Read the next message.
case BackendMessageCode.NoticeResponse:
case BackendMessageCode.NotificationResponse:
case BackendMessageCode.ParameterStatus:
Contract.Assert(msg == null);
continue;
}
Contract.Assert(msg != null, "Message is null for code: " + messageCode);
return msg;
}
}
internal async Task<IBackendMessage> SkipUntilAsync(BackendMessageCode stopAt, CancellationToken cancellationToken)
{
Contract.Requires(stopAt != BackendMessageCode.DataRow, "Shouldn't be used for rows, doesn't know about sequential");
while (true)
{
var msg = await (ReadMessageAsync(DataRowLoadingMode.Skip, cancellationToken).ConfigureAwait(false));
Contract.Assert(!(msg is DataRowMessage));
if (msg.Code == stopAt)
{
return msg;
}
}
}
internal async Task<IBackendMessage> SkipUntilAsync(BackendMessageCode stopAt1, BackendMessageCode stopAt2, CancellationToken cancellationToken)
{
Contract.Requires(stopAt1 != BackendMessageCode.DataRow, "Shouldn't be used for rows, doesn't know about sequential");
Contract.Requires(stopAt2 != BackendMessageCode.DataRow, "Shouldn't be used for rows, doesn't know about sequential");
while (true)
{
var msg = await (ReadMessageAsync(DataRowLoadingMode.Skip, cancellationToken).ConfigureAwait(false));
Contract.Assert(!(msg is DataRowMessage));
if (msg.Code == stopAt1 || msg.Code == stopAt2)
{
return msg;
}
}
}
internal async Task<T> ReadExpectingAsync<T>(CancellationToken cancellationToken)where T : class, IBackendMessage
{
var msg = await (ReadMessageAsync(DataRowLoadingMode.NonSequential, cancellationToken).ConfigureAwait(false));
var asExpected = msg as T;
if (asExpected == null)
{
Break();
throw new NpgsqlException($"Received backend message {msg.Code} while expecting {typeof (T).Name}. Please file a bug.");
}
return asExpected;
}
internal async Task ReadAsyncMessageAsync(CancellationToken cancellationToken)
{
ReceiveTimeout = UserTimeout;
await ReadBuffer.EnsureAsync(5, cancellationToken, true).ConfigureAwait(false);
var messageCode = (BackendMessageCode)ReadBuffer.ReadByte();
Contract.Assume(Enum.IsDefined(typeof (BackendMessageCode), messageCode), "Unknown message code: " + messageCode);
var len = ReadBuffer.ReadInt32() - 4; // Transmitted length includes itself
var buf = await (ReadBuffer.EnsureOrAllocateTempAsync(len, cancellationToken).ConfigureAwait(false));
var msg = ParseServerMessage(buf, messageCode, len, DataRowLoadingMode.NonSequential, false);
switch (messageCode)
{
case BackendMessageCode.NoticeResponse:
case BackendMessageCode.NotificationResponse:
case BackendMessageCode.ParameterStatus:
break;
case BackendMessageCode.ErrorResponse:
// We can get certain asynchronous errors if the remote process is terminated, etc.
// We assume this is fatal.
Break();
throw new PostgresException(buf);
default:
Break();
throw new NpgsqlException($"Received unexpected message {msg} while waiting for an asynchronous message");
}
}
internal async Task RollbackAsync(CancellationToken cancellationToken)
{
Log.Debug("Rollback transaction", Id);
await ExecuteInternalCommandAsync(PregeneratedMessage.RollbackTransaction, cancellationToken).ConfigureAwait(false);
}
internal async Task ExecuteInternalCommandAsync(FrontendMessage message, CancellationToken cancellationToken)
{
Contract.Requires(message is QueryMessage || message is PregeneratedMessage);
await SendMessageAsync(message, cancellationToken).ConfigureAwait(false);
await ReadExpectingAsync<CommandCompleteMessage>(cancellationToken).ConfigureAwait(false);
await ReadExpectingAsync<ReadyForQueryMessage>(cancellationToken).ConfigureAwait(false);
}
}
/// <summary>
/// Reads a forward-only stream of rows from a data source.
/// </summary>
public partial class NpgsqlDataReader
{
async Task<bool> ReadInternalAsync(CancellationToken cancellationToken)
{
if (_row != null)
{
await _row.ConsumeAsync(cancellationToken).ConfigureAwait(false);
_row = null;
}
switch (_state)
{
case ReaderState.InResult:
break;
case ReaderState.BetweenResults:
case ReaderState.Consumed:
case ReaderState.Closed:
return false;
default:
throw new ArgumentOutOfRangeException();
}
try
{
if ((_behavior & CommandBehavior.SingleRow) != 0 && _readOneRow)
{
await ConsumeAsync(cancellationToken).ConfigureAwait(false);
return false;
}
while (true)
{
var msg = await (ReadMessageAsync(cancellationToken).ConfigureAwait(false));
switch (ProcessMessage(msg))
{
case ReadResult.RowRead:
return true;
case ReadResult.RowNotRead:
return false;
case ReadResult.ReadAgain:
continue;
default:
throw new ArgumentOutOfRangeException();
}
}
}
catch (PostgresException)
{
_state = ReaderState.Consumed;
throw;
}
}
async Task<bool> NextResultInternalAsync(CancellationToken cancellationToken)
{
Contract.Requires(!IsSchemaOnly);
// Contract.Ensures(Command.CommandType != CommandType.StoredProcedure || Contract.Result<bool>() == false);
// If we're in the middle of a resultset, consume it
switch (_state)
{
case ReaderState.InResult:
if (_row != null)
{
await _row.ConsumeAsync(cancellationToken).ConfigureAwait(false);
_row = null;
}
// TODO: Duplication with SingleResult handling above
var completedMsg = await (SkipUntilAsync(BackendMessageCode.CompletedResponse, BackendMessageCode.EmptyQueryResponse, cancellationToken).ConfigureAwait(false));
ProcessMessage(completedMsg);
break;
case ReaderState.BetweenResults:
break;
case ReaderState.Consumed:
case ReaderState.Closed:
return false;
default:
throw new ArgumentOutOfRangeException();
}
Contract.Assert(_state == ReaderState.BetweenResults);
_hasRows = null;
#if NET45 || NET451
_cachedSchemaTable = null;
#endif
if ((_behavior & CommandBehavior.SingleResult) != 0 && _statementIndex == 0)
{
if (_state == ReaderState.BetweenResults)
await ConsumeAsync(cancellationToken).ConfigureAwait(false);
return false;
}
// We are now at the end of the previous result set. Read up to the next result set, if any.
// Non-prepared statements receive ParseComplete, BindComplete, DescriptionRow/NoData,
// prepared statements receive only BindComplete
for (_statementIndex++; _statementIndex < _statements.Count; _statementIndex++)
{
if (IsPrepared)
{
await _connector.ReadExpectingAsync<BindCompleteMessage>(cancellationToken).ConfigureAwait(false);
// Row descriptions have already been populated in the statement objects at the
// Prepare phase
_rowDescription = _statements[_statementIndex].Description;
}
else // Non-prepared flow
{
await _connector.ReadExpectingAsync<ParseCompleteMessage>(cancellationToken).ConfigureAwait(false);
await _connector.ReadExpectingAsync<BindCompleteMessage>(cancellationToken).ConfigureAwait(false);
var msg = await (_connector.ReadMessageAsync(DataRowLoadingMode.NonSequential, cancellationToken).ConfigureAwait(false));
switch (msg.Code)
{
case BackendMessageCode.NoData:
_rowDescription = _statements[_statementIndex].Description = null;
break;
case BackendMessageCode.RowDescription:
// We have a resultset
_rowDescription = _statements[_statementIndex].Description = (RowDescriptionMessage)msg;
break;
default:
throw _connector.UnexpectedMessageReceived(msg.Code);
}
}
if (_rowDescription == null)
{
// Statement did not generate a resultset (e.g. INSERT)
// Read and process its completion message and move on to the next
var msg = await (_connector.ReadMessageAsync(DataRowLoadingMode.NonSequential, cancellationToken).ConfigureAwait(false));
if (msg.Code != BackendMessageCode.CompletedResponse && msg.Code != BackendMessageCode.EmptyQueryResponse)
throw _connector.UnexpectedMessageReceived(msg.Code);
ProcessMessage(msg);
continue;
}
// We got a new resultset.
// Read the next message and store it in _pendingRow, this is to make sure that if the
// statement generated an error, it gets thrown here and not on the first call to Read().
if (_statementIndex == 0 && Command.Parameters.Any(p => p.IsOutputDirection))
{
// If output parameters are present and this is the first row of the first resultset,
// we must read it in non-sequential mode because it will be traversed twice (once
// here for the parameters, then as a regular row).
_pendingMessage = await (_connector.ReadMessageAsync(DataRowLoadingMode.NonSequential, cancellationToken).ConfigureAwait(false));
PopulateOutputParameters();
}
else
_pendingMessage = await (_connector.ReadMessageAsync(IsSequential ? DataRowLoadingMode.Sequential : DataRowLoadingMode.NonSequential, cancellationToken).ConfigureAwait(false));
_state = ReaderState.InResult;
return true;
}
// There are no more queries, we're done. Read to the RFQ.
ProcessMessage(_connector.ReadExpecting<ReadyForQueryMessage>());
_rowDescription = null;
return false;
}
async Task<bool> NextResultSchemaOnlyAsync(CancellationToken cancellationToken)
{
Contract.Requires(IsSchemaOnly);
for (_statementIndex++; _statementIndex < _statements.Count; _statementIndex++)
{
if (IsPrepared)
{
// Row descriptions have already been populated in the statement objects at the
// Prepare phase
_rowDescription = _statements[_statementIndex].Description;
}
else
{
await _connector.ReadExpectingAsync<ParseCompleteMessage>(cancellationToken).ConfigureAwait(false);
await _connector.ReadExpectingAsync<ParameterDescriptionMessage>(cancellationToken).ConfigureAwait(false);
var msg = await (_connector.ReadMessageAsync(DataRowLoadingMode.NonSequential, cancellationToken).ConfigureAwait(false));
switch (msg.Code)
{
case BackendMessageCode.NoData:
_rowDescription = _statements[_statementIndex].Description = null;
break;
case BackendMessageCode.RowDescription:
// We have a resultset
_rowDescription = _statements[_statementIndex].Description = (RowDescriptionMessage)msg;
Command.FixupRowDescription(_rowDescription, _statementIndex == 0);
break;
default:
throw _connector.UnexpectedMessageReceived(msg.Code);
}
}
if (_rowDescription != null)
{
// Found a resultset
return true;
}
}
// There are no more queries, we're done. Read to the RFQ.
if (!IsPrepared)
{
ProcessMessage(_connector.ReadExpecting<ReadyForQueryMessage>());
_rowDescription = null;
}
return false;
}