static void Initialize()
{
if (_initCalled)
{
return;
}
_initCalled = true;
// Port that rhino.compute is running on
// todo: figure out how to programatically determine this port
ComputeChildren.ParentPort = 5000;
// Set idle time child processes live. If rhino.compute is not called
// for this period of time to proxy requests, the child processes will
// shut down. The processes will be restarted on a later request
ComputeChildren.ChildIdleSpan = new System.TimeSpan(1, 0, 0);
// Number of child compute.geometry processes to start for processing.
// Default to 4 instances, but we might want to set this based on the
// number of cores available on the computer.
ComputeChildren.SpawnCount = 4;
_client = new HttpClient(new HttpClientHandler {
AllowAutoRedirect = false
});
_client.DefaultRequestHeaders.Add("User-Agent", $"compute.rhino3d-proxy/1.0.0");
// Launch child processes on start. Getting the base url is enough to get things rolling
ComputeChildren.UpdateLastCall();
Task.Run(() => ComputeChildren.GetComputeServerBaseUrl());
}
async Task <HttpResponseMessage> SendProxyRequest(HttpRequest initialRequest, HttpMethod method)
{
string baseurl = ComputeChildren.GetComputeServerBaseUrl();
string proxyUrl = $"{baseurl}{initialRequest.Path}{initialRequest.QueryString}";
// mark the current time as a call to a compute child process
ComputeChildren.UpdateLastCall();
if (method == HttpMethod.Post)
{
using (var stream = initialRequest.BodyReader.AsStream(false))
{
using (var sw = new System.IO.StreamReader(initialRequest.BodyReader.AsStream()))
{
string body = sw.ReadToEnd();
using (var stringContent = new StringContent(body, System.Text.Encoding.UTF8, "applicaton/json"))
{
return(await _client.PostAsync(proxyUrl, stringContent));
}
}
}
}
if (method == HttpMethod.Get)
{
return(await _client.GetAsync(proxyUrl));
}
throw new System.NotSupportedException("Only GET and POST are currently supported for reverse proxy");
}
private async Task ReverseProxyPost(HttpRequest req, HttpResponse res)
{
var proxyResponse = await SendProxyRequest(req, HttpMethod.Post);
ComputeChildren.UpdateLastCall();
var s = await proxyResponse.Content.ReadAsStringAsync();
await res.WriteAsync(s);
}
private async Task ReverseProxyGet(HttpRequest req, HttpResponse res)
{
string responseString;
using (var tracker = new ConcurrentRequestTracker())
{
var proxyResponse = await SendProxyRequest(req, HttpMethod.Get);
ComputeChildren.UpdateLastCall();
responseString = await proxyResponse.Content.ReadAsStringAsync();
}
await res.WriteAsync(responseString);
}
public ReverseProxyModule()
{
Get("/healthcheck", async(req, res) => await res.WriteAsync("healthy"));
Get("/robots.txt", async(req, res) => await res.WriteAsync("User-agent: *\nDisallow: / "));
Get("/idlespan", async(req, res) => await res.WriteAsync($"{ComputeChildren.IdleSpan()}"));
Get("/", async(req, res) => await res.WriteAsync("compute.rhino3d"));
// routes that are proxied to compute.geometry
Get("/{*uri}", ReverseProxyGet);
Post("/grasshopper", ReverseProxyGrasshopper);
Post("/{*uri}", ReverseProxyPost);
Initialize();
}
Task LaunchChildren(HttpRequest request, HttpResponse response)
{
int children = System.Convert.ToInt32(request.Query["children"]);
int parentProcessId = System.Convert.ToInt32(request.Query["parent"]);
if (Program.IsParentRhinoProcess(parentProcessId))
{
for (int i = 0; i < children; i++)
{
ComputeChildren.LaunchCompute(false);
}
}
return(null);
}
async Task <HttpResponseMessage> SendProxyRequest(HttpRequest initialRequest, HttpMethod method)
{
var task = _initTask;
if (task != null)
{
await task;
_initTask = null;
}
string baseurl = ComputeChildren.GetComputeServerBaseUrl();
string proxyUrl = $"{baseurl}{initialRequest.Path}{initialRequest.QueryString}";
// mark the current time as a call to a compute child process
ComputeChildren.UpdateLastCall();
if (method == HttpMethod.Post)
{
// include RhinoComputeKey header in request to compute child process
var req = new HttpRequestMessage(HttpMethod.Post, proxyUrl);
if (initialRequest.Headers.TryGetValue(_apiKeyHeader, out var keyHeader))
{
req.Headers.Add(_apiKeyHeader, keyHeader.ToString());
}
using (var stream = initialRequest.BodyReader.AsStream(false))
{
using (var sw = new System.IO.StreamReader(initialRequest.BodyReader.AsStream()))
{
string body = sw.ReadToEnd();
using (var stringContent = new StringContent(body, System.Text.Encoding.UTF8, "applicaton/json"))
{
req.Content = stringContent;
return(await _client.SendAsync(req));
}
}
}
}
if (method == HttpMethod.Get)
{
return(await _client.GetAsync(proxyUrl));
}
throw new System.NotSupportedException("Only GET and POST are currently supported for reverse proxy");
}
static void Initialize()
{
if (_initCalled)
{
return;
}
_initCalled = true;
_client = new HttpClient(new HttpClientHandler {
AllowAutoRedirect = false
});
_client.DefaultRequestHeaders.Add("User-Agent", $"compute.rhino3d-proxy/1.0.0");
// Launch child processes on start. Getting the base url is enough to get things rolling
ComputeChildren.UpdateLastCall();
_initTask = Task.Run(() => ComputeChildren.GetComputeServerBaseUrl());
}
public ReverseProxyModule()
{
Get("/healthcheck", async(req, res) => await res.WriteAsync("healthy"));
Get("/robots.txt", async(req, res) => await res.WriteAsync("User-agent: *\nDisallow: / "));
Get("/idlespan", async(req, res) => await res.WriteAsync($"{ComputeChildren.IdleSpan()}"));
Get("/", async(req, res) => await res.WriteAsync("compute.rhino3d"));
// I would like to catch all other GET endpoints and just pass them on. Currently,
// to lazy to figure out the nice way to do this
Get("/{a}", ReverseProxyGet);
Get("/{a}/{b}", ReverseProxyGet);
Get("/{a}/{b}/{c}", ReverseProxyGet);
Get("/{a}/{b}/{c}/{d}", ReverseProxyGet);
Get("/{a}/{b}/{c}/{d}/{e}", ReverseProxyGet);
Post("/grasshopper", ReverseProxyGrasshopper);
Post("/{uri}", ReverseProxyPost);
Initialize();
}
private async Task ReverseProxyGet(HttpRequest req, HttpResponse res)
{
await AwaitInitTask();
string responseString;
using (var tracker = new ConcurrentRequestTracker())
{
var(baseurl, port) = ComputeChildren.GetComputeServerBaseUrl();
var proxyResponse = await SendProxyRequest(req, HttpMethod.Get, baseurl);
ComputeChildren.UpdateLastCall();
if (proxyResponse.StatusCode == System.Net.HttpStatusCode.OK)
{
ComputeChildren.MoveToFrontOfQueue(port);
}
responseString = await proxyResponse.Content.ReadAsStringAsync();
}
await res.WriteAsync(responseString);
}