/// <summary>
/// Parse Http response string and return a ThingSpeakHttpResponse object
/// </summary>
/// <param name="response">Http response string</param>
/// <returns>ThingSpeakHttpResponse object</returns>
internal static ThingSpeakHttpResponse Parse(string response)
{
ThingSpeakHttpResponse httpResponse = new ThingSpeakHttpResponse();
int i = 0;
int headerSize = 0;
// split response lines on line feed
string[] lines = response.Split(LF);
// trim line on carriage return
lines[i] = lines[i].TrimEnd(CR);
// headers end with empty string
while (lines[i] != String.Empty)
{
// calculate header size
headerSize += lines[i].Length + CRLF.Length;
int separatorIndex = lines[i].IndexOf(":");
// first line contains Http response code
if (i == 0)
{
httpResponse.ResponseCode = lines[i];
httpResponse.StatusCode = Convert.ToInt32(httpResponse.ResponseCode.Substring(httpResponse.ResponseCode.IndexOf(' ') + 1, 3));
}
// found header-value separator
else if (separatorIndex != -1)
httpResponse.Headers.Add(lines[i].Substring(0, separatorIndex), lines[i].Substring(separatorIndex + 1).Trim());
i++;
// trim end carriage return of each line
lines[i] = lines[i].TrimEnd(CR);
}
// next line (body start)
i++;
// set start of body inside response
int bodyOffset = headerSize + CRLF.Length;
// get body from entire response
string body = response.Substring(bodyOffset);
// content length specified
if (httpResponse.Headers.Contains("Content-Length"))
{
httpResponse.Body = body.Substring(0, Convert.ToInt32(httpResponse.Headers["Content-Length"].ToString()));
}
// transfer encoding specified
else if (httpResponse.Headers.Contains("Transfer-Encoding"))
{
// body chunked
if (httpResponse.Headers["Transfer-Encoding"].ToString() == "chunked")
{
httpResponse.Body = String.Empty;
int chunkDim = 0;
int currBodyOffset = 0;
do
{
// get chunk dimension
chunkDim = Convert.ToInt32(body.Substring(0, body.IndexOf(CRLF)), 16);
// get the following body chunk
if (chunkDim != 0)
{
// set offset after chunk dimension
currBodyOffset = body.IndexOf(CRLF) + CRLF.Length;
// get the body chunk
httpResponse.Body += body.Substring(currBodyOffset, chunkDim);
// update body part to analize
body = body.Substring(currBodyOffset + chunkDim + CRLF.Length);
}
} while (chunkDim != 0);
// trim last CRLF of body
httpResponse.Body = httpResponse.Body.TrimEnd(LF).TrimEnd(CR);
}
}
return httpResponse;
}
/// <summary>
/// Update a channel
/// </summary>
/// <param name="writeApiKey">Write API Key for the channel to update</param>
/// <param name="dataEntry">Data entry for updating channel</param>
/// <returns>Update result</returns>
public bool Update(
string writeApiKey,
DataEntry dataEntry)
{
// check for a mandatory write API Key
if ((writeApiKey == null) || (writeApiKey == String.Empty))
{
throw new ArgumentNullException("writeApiKey", "You must specify a write API Key");
}
// check max fields number
if (dataEntry.Fields.Length > THING_SPEAK_MAX_FIELDS)
{
throw new ArgumentException("fields", "Max number of field is " + THING_SPEAK_MAX_FIELDS);
}
// check at leaset one field value not empty
bool checkFields = false;
for (int i = 0; i < dataEntry.Fields.Length; i++)
{
if (dataEntry.Fields[i] != null)
{
checkFields = true;
break;
}
}
if (!checkFields)
{
throw new ArgumentNullException("fields", "You must specify a field value at least");
}
// check status message
if ((dataEntry.Status != null) && (dataEntry.Status.Length > THING_SPEAK_MAX_STATUS))
{
throw new ArgumentException("status", "Max status length is " + THING_SPEAK_MAX_STATUS);
}
// check twitter account and message
if (((dataEntry.Twitter == null) && (dataEntry.Tweet != null)) || ((dataEntry.Twitter != null) && (dataEntry.Tweet == null)))
{
throw new ArgumentException("twitter and tweet parameters must be both valued");
}
// build body
string body = String.Empty;
// fields...
for (int i = 0; i < dataEntry.Fields.Length; i++)
{
if ((dataEntry.Fields[i] != null) && (dataEntry.Fields[i] != String.Empty))
{
if (i > 0)
{
body += "&";
}
body += "field" + (i + 1) + "=" + dataEntry.Fields[i];
}
}
// ...location...
if (dataEntry.Location != null)
{
body += "&lat=" + dataEntry.Location.Latitude + "&long=" + dataEntry.Location.Longitude + "&elevation=" + dataEntry.Location.Elevation;
}
// ...status...
if (dataEntry.Status != null)
{
body += "&status=" + dataEntry.Status;
}
// ...twitter...
if ((dataEntry.Twitter != null) && (dataEntry.Tweet != null))
{
body += "&twitter=" + dataEntry.Twitter + "&tweet=" + dataEntry.Tweet;
}
// build HTTP request
string request = "POST " + THING_SPEAK_UPDATE_PATH + " HTTP/1.1" + CRLF;
request += "Host: " + THING_SPEAK_HOST + CRLF;
request += "Connection: close" + CRLF;
request += "X-THINGSPEAKAPIKEY: " + writeApiKey + CRLF;
request += "Content-Type: application/x-www-form-urlencoded" + CRLF;
request += "Content-Length: " + body.Length + CRLF;
request += CRLF;
request += body + CRLF;
string result = String.Empty;
// open socket e connect to the host
using (this.socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
this.socket.Connect(this.hostIpEndPoint);
// send HTTP request
this.sendBuffer = Encoding.UTF8.GetBytes(request);
if (this.SSL)
{
// TODO : HTTPS communication
}
else
{
// send HTTP request
this.socket.Send(this.sendBuffer);
// receive HTTP response
this.receiveBuffer = new byte[RECEIVE_BUFFER_SIZE];
// poll on socket for reading (timeout 30 sec)
while (this.socket.Poll(30 * 1000000, SelectMode.SelectRead))
{
// no data on th socket (closed or timeout)
if (this.socket.Available == 0)
{
break;
}
// empty buffer
Array.Clear(this.receiveBuffer, 0, this.receiveBuffer.Length);
// read data
this.socket.Receive(this.receiveBuffer);
// append response
result += new String(Encoding.UTF8.GetChars(this.receiveBuffer));
}
}
}
// decode HTTP response
ThingSpeakHttpResponse httpResponse = ThingSpeakHttpResponse.Parse(result);
Debug.Print(result);
if (httpResponse.StatusCode == 200)
{
// set entry Id received from the server
dataEntry.Id = Convert.ToInt32(httpResponse.Body);
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Parse Http response string and return a ThingSpeakHttpResponse object
/// </summary>
/// <param name="response">Http response string</param>
/// <returns>ThingSpeakHttpResponse object</returns>
internal static ThingSpeakHttpResponse Parse(string response)
{
ThingSpeakHttpResponse httpResponse = new ThingSpeakHttpResponse();
int i = 0;
int headerSize = 0;
// split response lines on line feed
string[] lines = response.Split(LF);
// trim line on carriage return
lines[i] = lines[i].TrimEnd(CR);
// headers end with empty string
while (lines[i] != String.Empty)
{
// calculate header size
headerSize += lines[i].Length + CRLF.Length;
int separatorIndex = lines[i].IndexOf(":");
// first line contains Http response code
if (i == 0)
{
httpResponse.ResponseCode = lines[i];
httpResponse.StatusCode = Convert.ToInt32(httpResponse.ResponseCode.Substring(httpResponse.ResponseCode.IndexOf(' ') + 1, 3));
}
// found header-value separator
else if (separatorIndex != -1)
{
httpResponse.Headers.Add(lines[i].Substring(0, separatorIndex), lines[i].Substring(separatorIndex + 1).Trim());
}
i++;
// trim end carriage return of each line
lines[i] = lines[i].TrimEnd(CR);
}
// next line (body start)
i++;
// set start of body inside response
int bodyOffset = headerSize + CRLF.Length;
// get body from entire response
string body = response.Substring(bodyOffset);
// content length specified
if (httpResponse.Headers.Contains("Content-Length"))
{
httpResponse.Body = body.Substring(0, Convert.ToInt32(httpResponse.Headers["Content-Length"].ToString()));
}
// transfer encoding specified
else if (httpResponse.Headers.Contains("Transfer-Encoding"))
{
// body chunked
if (httpResponse.Headers["Transfer-Encoding"].ToString() == "chunked")
{
httpResponse.Body = String.Empty;
int chunkDim = 0;
int currBodyOffset = 0;
do
{
// get chunk dimension
chunkDim = Convert.ToInt32(body.Substring(0, body.IndexOf(CRLF)), 16);
// get the following body chunk
if (chunkDim != 0)
{
// set offset after chunk dimension
currBodyOffset = body.IndexOf(CRLF) + CRLF.Length;
// get the body chunk
httpResponse.Body += body.Substring(currBodyOffset, chunkDim);
// update body part to analize
body = body.Substring(currBodyOffset + chunkDim + CRLF.Length);
}
} while (chunkDim != 0);
// trim last CRLF of body
httpResponse.Body = httpResponse.Body.TrimEnd(LF).TrimEnd(CR);
}
}
return(httpResponse);
}
/// <summary>
/// Read channel data entries
/// </summary>
/// <param name="readApiKey">Read API Key for the channel to read (null if channel is public)</param>
/// <param name="channelId">Channel ID</param>
/// <param name="path">Path for reading channel</param>
/// <returns>List of all data entries read</returns>
private ArrayList ReadChannel(string readApiKey, int channelId, string path)
{
// build HTTP request
string request = "GET /channels/" + channelId + path + " HTTP/1.1" + CRLF;
request += "Host: " + THING_SPEAK_HOST + CRLF;
request += "Connection: close" + CRLF;
if ((readApiKey != null) && (readApiKey != String.Empty))
{
request += "X-THINGSPEAKAPIKEY: " + readApiKey + CRLF;
}
request += CRLF;
string result = String.Empty;
// open socket e connect to the host
using (this.socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
this.socket.Connect(this.hostIpEndPoint);
this.sendBuffer = Encoding.UTF8.GetBytes(request);
if (this.SSL)
{
// TODO : HTTPS communication
}
else
{
// send HTTP request
this.socket.Send(this.sendBuffer);
// receive HTTP response
this.receiveBuffer = new byte[RECEIVE_BUFFER_SIZE];
// poll on socket for reading (timeout 30 sec)
while (this.socket.Poll(30 * 1000000, SelectMode.SelectRead))
{
// no data on th socket (closed or timeout)
if (this.socket.Available == 0)
{
break;
}
// empty buffer
Array.Clear(this.receiveBuffer, 0, this.receiveBuffer.Length);
// read data
this.socket.Receive(this.receiveBuffer);
// append response
result += new String(Encoding.UTF8.GetChars(this.receiveBuffer));
}
}
}
// decode HTTP response
ThingSpeakHttpResponse httpResponse = ThingSpeakHttpResponse.Parse(result);
Debug.Print(result);
if (httpResponse.StatusCode == 200)
{
return(DataEntry.ParseCsv(httpResponse.Body));
}
else
{
return(null);
}
}