org.opentripplanner.api.resource.ServerInfo Maven / Gradle / Ivy

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package org.opentripplanner.api.resource;

import org.opentripplanner.api.model.serverinfo.ApiServerInfo;
import org.opentripplanner.model.projectinfo.OtpProjectInfo;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;

@Path("/")
public class ServerInfo {
    
    private static final ApiServerInfo SERVER_INFO = createServerInfo();

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public ApiServerInfo getServerInfo() {
        return SERVER_INFO;
    }    
    
    /**
     * Determine the OTP version and CPU type of the running server. This information should not
     * change while the server is up, so it can safely be cached at startup. The project info
     * is not available before the graph is loaded, so for this to work this class should not be
     * loaded BEFORE that.
     */
    public static ApiServerInfo createServerInfo()  {
        String cpuName = "unknown";
        int nCores = 0;
        try {
            InputStream fis = new FileInputStream("/proc/cpuinfo");
            BufferedReader br = new BufferedReader(new InputStreamReader(fis, StandardCharsets.UTF_8));
            String line;
            while ((line = br.readLine()) != null) {
                if (line.startsWith("model name")) {
                    cpuName = line.split(": ")[1];
                    nCores += 1;
                }
            }
            fis.close();
        } 
        catch (Exception ignore) {}


        return new ApiServerInfo(cpuName, nCores, OtpProjectInfo.projectInfo());
    }
}