I have to monitor an url that keeps streaming status of the system.
If i issue following command from Windows CMD curl.exe http://localhost:8081/statusstream, I keep getting output from stream:
[02:10:51.021] Starting to execute testcase
[02:10:51.021] Test01: Preparing
[02:11:03.089] Test01: Executing 1/10
[02:11:11.109] Test01: Executing 2/10
[02:11:19.126] Test01: Executing 3/10
[02:11:27.145] Test01: Executing 4/10
[02:11:35.163] Test01: Executing 5/10
[02:11:43.181] Test01: Executing 6/10
[02:11:51.198] Test01: Executing 7/10
[02:11:59.220] Test01: Executing 8/10
[02:12:07.237] Test01: Executing 9/10
[02:12:15.255] Test01: Executing 10/10
[02:12:33.274] Test01: Transferring data for analysis
[02:12:41.562] WARNING: TestSequencer: No data found
[02:12:41.563] Test01: Analyze results
[02:12:42.064] Test01: Finished executing
[02:12:42.064] Finished executing testcase
However when I run the same command using C#, I don't get any standard output, all I get is standard error. Following is my C# code
ProcessStartInfo _processStartInfo = new ProcessStartInfo();
_processStartInfo.RedirectStandardOutput = true;
_processStartInfo.RedirectStandardError = true;
_processStartInfo.UseShellExecute = false;
_processStartInfo.CreateNoWindow = true;
_processStartInfo.FileName = "curl.exe"
_processStartInfo.Arguments = "http://localhost:8081/statusstream";
_process = new Process();
_process.StartInfo = _processStartInfo;
_process.EnableRaisingEvents = true;
_process.StartInfo.RedirectStandardOutput = true;
_process.StartInfo.RedirectStandardError = true;
_process.ErrorDataReceived += _process_ErrorDataReceived;
_process.OutputDataReceived += _process_OutputDataReceived;
_process.Exited += _process_Exited;
_process.Start();
_process.BeginOutputReadLine();
_process.BeginErrorReadLine();
The following method is always being hit, but not the the one which is waiting for StandardOutput
private void _process_ErrorDataReceived(object sender, DataReceivedEventArgs e)
{
if (!string.IsNullOrEmpty(e.Data))
this.ConsoleLog = string.Format("[StdErr] {0}",e.Data);
}
Output that i get from running CURL command from C# is:
[StdErr] % Total % Received % Xferd Average Speed Time Time Time Current
[StdErr] Dload Upload Total Spent Left Speed
[StdErr] 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
[StdErr] 100 40 0 40 0 0 33 0 --:--:-- 0:00:01 --:--:-- 33
[StdErr] 100 40 0 40 0 0 18 0 --:--:-- 0:00:02 --:--:-- 18
[StdErr] 100 40 0 40 0 0 12 0 --:--:-- 0:00:03 --:--:-- 12
[StdErr] 100 40 0 40 0 0 9 0 --:--:-- 0:00:04 --:--:-- 9
[StdErr] 100 40 0 40 0 0 7 0 --:--:-- 0:00:05 --:--:-- 7
[StdErr] 100 40 0 40 0 0 6 0 --:--:-- 0:00:06 --:--:-- 0
[StdErr] 100 40 0 40 0 0 5 0 --:--:-- 0:00:07 --:--:-- 0
[StdErr] 100 40 0 40 0 0 4 0 --:--:-- 0:00:08 --:--:-- 0
[StdErr] 100 40 0 40 0 0 4 0 --:--:-- 0:00:09 --:--:-- 0
[StdErr] 100 40 0 40 0 0 3 0 --:--:-- 0:00:10 --:--:-- 0
[StdErr] 100 40 0 40 0 0 3 0 --:--:-- 0:00:11 --:--:-- 0
[StdErr] 100 40 0 40 0 0 3 0 --:--:-- 0:00:12 --:--:-- 0
[StdErr] 100 112 0 112 0 0 16 0 --:--:-- 0:00:06 --:--:-- 16
[StdErr] 100 250 0 250 0 0 32 0 --:--:-- 0:00:07 --:--:-- 47
[StdErr] 100 250 0 250 0 0 29 0 --:--:-- 0:00:08 --:--:-- 47
[StdErr] 100 250 0 250 0 0 26 0 --:--:-- 0:00:09 --:--:-- 47
If I see the received column, its value increases from 40 to 250, that means probably something is being return from the stream.
Issuing other HTTP GET commands from CURL using C# gives proper standardoutput. But other get commands return content immediately and are not streaming continuously.
Can someone please point what I'm doing wrong.
Ok, so I'm not supposed to call cURL.exe from C# code. But is there a way where I can monitor a URL to get continuous stream of data whenever there are updates? I don't want to call HttpClient GetStringAsync in a while loop.
