mirror of
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110 lines
3.0 KiB
Go
110 lines
3.0 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"time"
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"github.com/alexellis/faas/gateway/metrics"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/filters"
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"github.com/docker/docker/client"
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"github.com/gorilla/mux"
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io_prometheus_client "github.com/prometheus/client_model/go"
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)
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func makeAlertHandler() http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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fmt.Println("Alert received.")
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body, _ := ioutil.ReadAll(r.Body)
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fmt.Println(string(body))
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// Todo: parse alert, validate alert and scale up or down function
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w.WriteHeader(http.StatusOK)
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}
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}
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// Function exported for system/functions endpoint
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type Function struct {
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Name string `json:"name"`
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Image string `json:"image"`
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InvocationCount float64 `json:"invocationCount"`
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Replicas uint64 `json:"replicas"`
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}
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func makeFunctionReader(metricsOptions metrics.MetricOptions, c *client.Client) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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serviceFilter := filters.NewArgs()
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options := types.ServiceListOptions{
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Filters: serviceFilter,
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}
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services, err := c.ServiceList(context.Background(), options)
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if err != nil {
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fmt.Println(err)
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}
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// TODO: Filter only "faas" functions (via metadata?)
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functions := make([]Function, 0)
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for _, service := range services {
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counter, _ := metricsOptions.GatewayFunctionInvocation.GetMetricWithLabelValues(service.Spec.Name)
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var pbmetric io_prometheus_client.Metric
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counter.Write(&pbmetric)
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invocations := pbmetric.GetCounter().GetValue()
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f := Function{
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Name: service.Spec.Name,
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Image: service.Spec.TaskTemplate.ContainerSpec.Image,
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InvocationCount: invocations,
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Replicas: *service.Spec.Mode.Replicated.Replicas,
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}
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functions = append(functions, f)
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}
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functionBytes, _ := json.Marshal(functions)
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(200)
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w.Write(functionBytes)
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}
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}
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func main() {
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var dockerClient *client.Client
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var err error
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dockerClient, err = client.NewEnvClient()
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if err != nil {
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log.Fatal("Error with Docker client.")
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}
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metricsOptions := metrics.BuildMetricsOptions()
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metrics.RegisterMetrics(metricsOptions)
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r := mux.NewRouter()
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r.HandleFunc("/function/{name:[a-zA-Z_]+}", MakeProxy(metricsOptions, true, dockerClient))
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r.HandleFunc("/system/alert", makeAlertHandler())
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r.HandleFunc("/system/functions", makeFunctionReader(metricsOptions, dockerClient)).Methods("GET")
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r.HandleFunc("/", MakeProxy(metricsOptions, false, dockerClient)).Methods("POST")
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metricsHandler := metrics.PrometheusHandler()
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r.Handle("/metrics", metricsHandler)
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r.PathPrefix("/").Handler(http.FileServer(http.Dir("./assets/"))).Methods("GET")
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s := &http.Server{
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Addr: ":8080",
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ReadTimeout: 8 * time.Second,
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WriteTimeout: 8 * time.Second,
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MaxHeaderBytes: 1 << 20,
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Handler: r,
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}
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log.Fatal(s.ListenAndServe())
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}
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