public static string InfluxCon(LineProtocolConnectionParameters conobj, string query)
{
var client = new WebClient();
var queryString = Uri.EscapeUriString("db=" + Uri.EscapeDataString(conobj.DBName) + "&q=" + query);//SELECT * FROM \"weather\"");
var queryUrl = conobj.Address + "query?" + queryString;
return(client.DownloadString(queryUrl));
}
/// <summary>
/// InfluxClient Constructor. The constructor expects LineProtocolConnectionParameters in params. It does initialization of HTTP Client and HTTP Client Handler.
/// It also does initialization of worker buffer and failure handler buffer.
/// </summary>
/// <param name="paramsObj">The reference of Line Protocol Connection parameters.</param>
/// <returns>returns instance of InfluxClient</returns>
public InfluxClient(LineProtocolConnectionParameters paramsObj)
{
//1. populate necessary fields for Influx Connection
//create HTTP Client for connection to Influx
_httpClientHandler = new HttpClientHandler {
AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
};
_httpClient = new HttpClient(_httpClientHandler)
{
BaseAddress = paramsObj.Address
};
//Create Influx POST request URL
_requestUri = $"write?db={Uri.EscapeDataString(paramsObj.DBName)}";
if (!string.IsNullOrEmpty(paramsObj.User))
{
_requestUri += $"&u={Uri.EscapeDataString(paramsObj.User)}&p={Uri.EscapeDataString(paramsObj.Password)}";
}
//2. populate necessary fields for buffer ( Using reactive Programming Rx )
//Create Subject for first buffer (worker buffer)
Subject <string> subject = new Subject <string>();
_synSubject = Subject.Synchronize(subject);
//Create first buffer ( worker buffer) with provided buffer flush time or buffer item limit for flush
_subscription = _synSubject
.Buffer(TimeSpan.FromSeconds(paramsObj.FlushBufferSeconds), paramsObj.FlushBufferItemsSize)
.Subscribe(onNext: async(pointsList) => await SendToInflux(pointsList, true));
//Second buffer in case first fails. If requests fail in first buffer it will queue in 2nd buffer
//Create Subject for second buffer (failure handler buffer)
Subject <string> subjectSecondQueue = new Subject <string>();
_synSubjectSecondQueue = Subject.Synchronize(subjectSecondQueue);
//Create second buffer ( failure handler buffer) with provided buffer flush time or buffer item limit for flush
_subscriptionSecondQueue = _synSubjectSecondQueue
.Buffer(TimeSpan.FromSeconds(paramsObj.FlushSecondBufferSeconds), paramsObj.FlushSecondBufferItemsSize)
.Subscribe(onNext: async(pointsListSecondQueue) => await SendToInflux(pointsListSecondQueue, false));
}
public static LineProtocolConnectionParameters InitConfiguration()
{
var confFileobj = new LineProtocolConnectionParameters
{
Address = new Uri("http://influxdb:8086"),
DBName = "telemetry",
User = "",
Password = "",
FlushBufferItemsSize = 2,
FlushBufferSeconds = 2,
FlushSecondBufferItemsSize = 2,
FlushSecondBufferSeconds = 3,
UseGzipCompression = true
};
return(confFileobj);
}
