DmitryKhryukin / process-monitor

Process Monitor API

• Monitors currently running processes
• Provides Server-Sent Events endpoing for automatic updates
• Cross platform solution

Prerequisites

.NET Core 3.1

Endpoint

• GET /api/processes

Response:

data:
{
"Processes":[
              {
                "Id":42,
                "ProcessName":"firstProcess",
                "TotalProcessorTime":273838.5829,
                "ThreadsCount":2,
                "PhysicalMemoryUsage":16306176,
                "UserProcessorTime":199349.0842,
                "PrivilegedProcessorTime":74489.4987,
                "State":"running"
              },
              {
                "Id":7019,
                "ProcessName":"secondProcess",
                "TotalProcessorTime":214658.2588,
                "ThreadsCount":4,
                "PhysicalMemoryUsage":43266048,
                "UserProcessorTime":150036.7363,
                "PrivilegedProcessorTime":64621.5225,
                "State":"running”
              }
            ]
}

Provided processes info:

Id (type: int) - process id

ProcessName (type: string)  - process name.

TotalProcessorTime (type: double) - total processor time for this process in milliseconds.

ThreadsCount (type: int) - number of threads that are running in the associated process.

PhysicalMemoryUsage (type: int) - amount of physical memory, in bytes, allocated for the associated process.

UserProcessorTime (type: double) - user processor time for this process in milliseconds.

PrivilegedProcessorTime (type: double) - privileged processor time for this process in milliseconds.

State (type: string) - process state "running” or "sleeping".

Server-sent events

A server-sent events approach is used to get automatic updates from the server every 3 second.

To open a connection to the server from a web client you have to use EventSource interface (please install npm package)

How to use EventSource:

let eventSource = new EventSource('https://yourHost/api/processes');

eventSource.addEventListener("open", function (e) {
  // connection is open
});

eventSource.addEventListener("message", function (e) {

  // got an update from the server
  // parse e.data json to show updated info
});

eventSource.addEventListener("error", function (e) {

  // server error
});

You can find a web client example here

Known issues and roadblocks

We don't show all system processes because of the following .NET Core issue: Process Property TotalProcessorTime throws InvalidOperationException exception on macOS

Currently we can't show CPU load because there is no way to calculate it using .NET Core on all platforms:

• Performance counters are not cross platform;
• we can't calculate sum of all processes CPU usage because we can't get TotalProcessorTime of all processes (as described in the issue above)