86 lines
2.8 KiB
C#
86 lines
2.8 KiB
C#
using Core;
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using KubernetesWorkflow;
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using Logging;
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using System.Text;
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namespace MetricsPlugin
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{
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public class PrometheusStarter
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{
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private readonly PrometheusContainerRecipe recipe = new PrometheusContainerRecipe();
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private readonly IPluginTools tools;
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public PrometheusStarter(IPluginTools tools)
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{
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this.tools = tools;
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}
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public RunningContainers CollectMetricsFor(IMetricsScrapeTarget[] targets)
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{
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Log($"Starting metrics server for {targets.Length} targets...");
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var startupConfig = new StartupConfig();
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startupConfig.Add(new PrometheusStartupConfig(GeneratePrometheusConfig(targets)));
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var workflow = tools.CreateWorkflow();
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var runningContainers = workflow.Start(1, recipe, startupConfig);
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if (runningContainers.Containers.Length != 1) throw new InvalidOperationException("Expected only 1 Prometheus container to be created.");
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Log("Metrics server started.");
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return runningContainers;
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}
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public MetricsAccess CreateAccessForTarget(RunningContainers metricsContainer, IMetricsScrapeTarget target)
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{
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var metricsQuery = new MetricsQuery(tools, metricsContainer.Containers.Single());
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return new MetricsAccess(metricsQuery, target);
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}
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public string GetPrometheusId()
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{
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return recipe.Image;
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}
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private void Log(string msg)
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{
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tools.GetLog().Log(msg);
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}
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private string GeneratePrometheusConfig(IMetricsScrapeTarget[] targets)
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{
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var config = "";
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config += "global:\n";
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config += " scrape_interval: 10s\n";
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config += " scrape_timeout: 10s\n";
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config += "\n";
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config += "scrape_configs:\n";
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config += " - job_name: services\n";
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config += " metrics_path: /metrics\n";
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config += " static_configs:\n";
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config += " - targets:\n";
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foreach (var target in targets)
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{
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config += $" - '{FormatTarget(target)}'\n";
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}
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var bytes = Encoding.ASCII.GetBytes(config);
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return Convert.ToBase64String(bytes);
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}
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private string FormatTarget(IMetricsScrapeTarget target)
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{
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return ScrapeTargetHelper.FormatTarget(tools.GetLog(), target);
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}
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}
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public static class ScrapeTargetHelper
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{
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public static string FormatTarget(ILog log, IMetricsScrapeTarget target)
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{
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var a = target.Container.GetAddress(log, target.MetricsPortTag);
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var host = a.Host.Replace("http://", "").Replace("https://", "");
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return $"{host}:{a.Port}";
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}
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}
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}
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