/// <summary>
/// Sends request to Clusterpoint Server. Returned CPS_Response should be casted to command-specific response class.
/// </summary>
/// <param name="request">Request to send.</param>
/// <returns>Command-specific CPS_Response object instance.</returns>
public CPS_Response sendRequest(CPS_Request request)
{
bool firstSend = true;
string previousRenderedStorage = "";
string requestXml = "";
byte[] requestBytes = null;
string rawResponse = "";
bool quit = true;
if (this.p_connectionSwitcher != null)
this.p_connectionSwitcher.newRequest(request);
do
{
CPS_Exception e = null;
if (this.p_connectionSwitcher != null)
this.p_connectionString = this.parseConnectionString(this.p_connectionSwitcher.getConnectionString(ref this.p_storageName));
try
{
if (this.p_transactionId != null)
request.setParam("transaction_id", this.p_transactionId);
if (firstSend || previousRenderedStorage != this.p_storageName)
{
requestXml = this.renderRequest(request);
requestBytes = Encoding.UTF8.GetBytes(requestXml);
previousRenderedStorage = this.p_storageName;
if (this.p_debug)
{
FileStream fs = new FileStream("request.xml", FileMode.Create);
fs.Write(requestBytes, 0, requestBytes.Length);
fs.Close();
}
}
firstSend = false;
this.p_lastRequestSize = requestXml.Length;
this.p_lastNetworkDuration = 0;
Stopwatch totTimer = new Stopwatch();
Stopwatch netTimer = new Stopwatch();
totTimer.Start();
if (this.p_connectionString.Scheme.ToLower() == "http")
{
// TODO: implement HMAC support when server side supports it
HttpWebRequest webreq = (HttpWebRequest)HttpWebRequest.Create(this.p_connectionString.OriginalString);
webreq.UserAgent = this.p_applicationId;
webreq.Method = "POST";
webreq.ContentType = "application/x-www-form-urlencoded";
webreq.ContentLength = requestBytes.Length;
webreq.Headers["Recipient"] = this.p_storageName;
webreq.Proxy = null;
Stream webreq_data;
try
{
webreq_data = webreq.GetRequestStream();
}
catch (Exception)
{
throw new CPS_Exception("Invalid connection string").SetCode(CPS_Exception.ERROR_CODE.INVALID_CONNECTION_STRING);
}
netTimer.Start();
webreq_data.Write(requestBytes, 0, requestBytes.Length);
webreq_data.Close();
netTimer.Stop();
HttpWebResponse webrsp;
try
{
webrsp = (HttpWebResponse)webreq.GetResponse();
}
catch (Exception)
{
throw new CPS_Exception("Invalid connection string").SetCode(CPS_Exception.ERROR_CODE.INVALID_CONNECTION_STRING);
}
Stream webrsp_data = webrsp.GetResponseStream();
StreamReader webrsp_reader = new StreamReader(webrsp_data);
netTimer.Start();
rawResponse = webrsp_reader.ReadToEnd();
webrsp_reader.Close();
netTimer.Stop();
}
if (this.p_connectionString.Scheme.ToLower() == "tcp" || this.p_connectionString.Scheme.ToLower() == "tcps")
{
int port = this.p_connectionString.Port;
if (port <= 0)
port = 5550;
TcpClient tcp;
try
{
netTimer.Start();
tcp = new TcpClient(this.p_connectionString.Host, port);
netTimer.Stop();
}
catch (SocketException)
{
netTimer.Stop();
throw new CPS_Exception("Cannot connect to specified server").SetCode(CPS_Exception.ERROR_CODE.SOCKET_ERROR);
}
catch (Exception) // all other cases
{
netTimer.Stop();
throw new CPS_Exception("Invalid connection string").SetCode(CPS_Exception.ERROR_CODE.INVALID_CONNECTION_STRING);
}
NetworkStream net = tcp.GetStream();
System.IO.Stream strm = net;
if (this.p_connectionString.Scheme.ToLower() == "tcps")
{
System.Net.Security.SslStream ssl = new System.Net.Security.SslStream(strm, false, new System.Net.Security.RemoteCertificateValidationCallback(ConnectionServerValidationCallback), null);
try
{
ssl.AuthenticateAsClient(this.p_connectionString.Host);
}
catch (Exception)
{
throw new CPS_Exception("Error establishing SSL connection").SetCode(CPS_Exception.ERROR_CODE.SSL_HANDSHAKE);
}
strm = ssl;
}
Protobuf pb = new Protobuf();
pb.CreateField(1, Protobuf.WireType.LengthDelimited, requestBytes);
pb.CreateStringField(2, this.p_storageName);
if (this.p_hmacUserKey != null && this.p_hmacSignKey != null)
{
string characters = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
char[] tokenchars = new char[16];
for (int i = 0; i < 16; i++)
tokenchars[i] = characters[this.p_random.Next(characters.Length)];
string token = new string(tokenchars);
System.DateTime epoch = new System.DateTime(1970, 1, 1, 0, 0, 0, 0).ToUniversalTime();
System.DateTime validity = System.DateTime.Now.ToUniversalTime();
validity.AddSeconds(10);
System.TimeSpan dtdiff = validity - epoch;
UInt64 unixvalidity = (UInt64)dtdiff.TotalSeconds;
pb.CreateStringField(14, token);
pb.CreateFixed64Field(15, unixvalidity);
pb.CreateStringField(16, this.p_hmacUserKey);
pb.CreateStringField(17, CPS_Hasher.SHA1(CPS_Hasher.SHA1(requestXml) + token + unixvalidity + this.p_hmacSignKey));
pb.CreateStringField(18, CPS_Hasher.SHA1_HMAC(this.p_hmacSignKey, requestXml + token + unixvalidity));
}
MemoryStream ms = new MemoryStream();
Protobuf_Streamer pbs = new Protobuf_Streamer(ms);
pb.WriteToStream(pbs);
byte[] header = CPS_Length2Header((int)(ms.Length));
netTimer.Start();
try
{
strm.Write(header, 0, 8);
strm.Write(ms.GetBuffer(), 0, (int)(ms.Length));
}
catch (Exception)
{
netTimer.Stop();
throw new CPS_Exception("Error sending request").SetCode(CPS_Exception.ERROR_CODE.SOCKET_ERROR);
}
strm.Flush();
try
{
strm.Read(header, 0, 8);
netTimer.Stop();
}
catch (Exception)
{
netTimer.Stop();
throw new CPS_Exception("Error receiving response").SetCode(CPS_Exception.ERROR_CODE.SOCKET_ERROR);
}
int len = CPS_Header2Length(header);
if (len <= 0)
throw new CPS_Exception("Invalid response from server").SetCode(CPS_Exception.ERROR_CODE.INVALID_RESPONSE);
byte[] recv = new byte[len];
int got = 0;
netTimer.Start();
while (got < len)
{
int br = 0;
try
{
br = strm.Read(recv, got, len - got);
if (br == 0)
{
netTimer.Stop();
throw new CPS_Exception("Server unexpectedly closed connection").SetCode(CPS_Exception.ERROR_CODE.SOCKET_ERROR);
}
}
catch (Exception)
{
netTimer.Stop();
throw new CPS_Exception("Error receiving response").SetCode(CPS_Exception.ERROR_CODE.SOCKET_ERROR);
}
got += br;
}
strm.Close();
netTimer.Stop();
ms = new MemoryStream(recv);
pbs = new Protobuf_Streamer(ms);
pb = new Protobuf(pbs);
rawResponse = pb.GetStringField(1);
}
totTimer.Stop();
this.p_lastRequestDuration = totTimer.ElapsedMilliseconds;
this.p_lastRequestDuration = this.p_lastRequestDuration / 1000.0;
this.p_lastNetworkDuration = netTimer.ElapsedMilliseconds;
this.p_lastNetworkDuration = this.p_lastNetworkDuration / 1000.0;
this.p_lastResponseSize = rawResponse.Length;
if (this.p_debug)
{
FileStream fs = new FileStream("response.xml", FileMode.Create);
byte[] responseBytes = Encoding.UTF8.GetBytes(rawResponse);
fs.Write(responseBytes, 0, responseBytes.Length);
fs.Close();
}
}
catch (CPS_Exception e_)
{
e = e_;
}
if (this.p_connectionSwitcher != null)
quit = !this.p_connectionSwitcher.shouldRetry(rawResponse, e);
else
quit = true;
if (quit && e != null)
throw e;
}
while (!quit);
switch (request.getCommand())
{
case "search":
case "similar":
return new CPS_SearchResponse(this, request, rawResponse);
case "update":
case "delete":
case "replace":
case "partial-replace":
case "partial-xreplace":
case "insert":
case "create-alert":
case "update-alerts":
case "delete-alerts":
return new CPS_ModifyResponse(this, request, rawResponse);
case "alternatives":
return new CPS_AlternativesResponse(this, request, rawResponse);
case "list-words":
return new CPS_ListWordsResponse(this, request, rawResponse);
case "status":
return new CPS_StatusResponse(this, request, rawResponse);
case "retrieve":
case "list-last":
case "list-first":
case "retrieve-last":
case "retrive-first":
case "lookup":
case "show-history":
return new CPS_LookupResponse(this, request, rawResponse);
case "search-delete":
return new CPS_SearchDeleteResponse(this, request, rawResponse);
case "list-paths":
return new CPS_ListPathsResponse(this, request, rawResponse);
case "list-facets":
return new CPS_ListFacetsResponse(this, request, rawResponse);
case "list-alerts":
return new CPS_Response(this, request, rawResponse);
// TODO: change this !!!
default:
CPS_Response ret = new CPS_Response(this, request, rawResponse);
// This is explicitly processed here, because of .NET limitations. PHP API changes this directly from CPS_Response constructor.
if (request.getCommand() == "begin-transaction" || request.getCommand() == "commit-transaction" || request.getCommand() == "rollback-transaction")
this.p_transactionId = ret.getTransactionId();
return ret;
}
}
/// <summary>
/// Renders request XML for sending to storage.
/// </summary>
/// <param name="request">Request instance to render.</param>
/// <returns>XML request as string.</returns>
private string renderRequest(CPS_Request request)
{
Dictionary<string, string> envelopeFields = new Dictionary<string, string>();
envelopeFields["storage"] = this.p_storageName;
envelopeFields["user"] = this.p_username;
envelopeFields["password"] = this.p_password;
envelopeFields["command"] = request.getCommand();
foreach (KeyValuePair<string, string> cep in this.p_customEnvelopeParams)
envelopeFields[cep.Key] = cep.Value;
if (request.getRequestId().Length > 0)
envelopeFields["requestid"] = request.getRequestId();
if (this.p_applicationId.Length > 0)
envelopeFields["application"] = this.p_applicationId;
if (request.getRequestType().Length > 0)
envelopeFields["type"] = request.getRequestType();
if (request.getClusterLabel().Length > 0)
envelopeFields["label"] = request.getClusterLabel();
return request.getRequestXML(this.p_documentRootXpath, this.p_documentIdXpath, envelopeFields, this.p_docid_resetting);
}
/// <summary>
/// This is called by CPS_Connection whenever there is a new request to be sent. This method should not be used directly.
/// </summary>
/// <param name="request">The request before being rendered.</param>
public void newRequest(CPS_Request request)
{
if (request.getCommand() == "search")
this.p_retryRequests = true;
else
this.p_retryRequests = false;
if (this.p_numUsed == this.p_connectionStrings.Count)
{
this.p_usedConnections.Clear();
this.p_numUsed = 0;
this.p_lastReturnedIndex = -1;
this.p_lastSuccess = false;
}
}