mirror of
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102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
package main
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import (
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"bytes"
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"context"
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"log"
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"net/http"
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"time"
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"io/ioutil"
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"strconv"
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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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"github.com/prometheus/client_golang/prometheus"
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)
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func lookupSwarmService(serviceName string) (bool, error) {
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var c *client.Client
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var err error
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c, 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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serviceFilter := filters.NewArgs()
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serviceFilter.Add("name", serviceName)
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services, err := c.ServiceList(context.Background(), types.ServiceListOptions{Filters: serviceFilter})
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return len(services) > 0, err
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}
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func makeProxy(metrics metrics.MetricOptions) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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metrics.GatewayRequestsTotal.Inc()
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start := time.Now()
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if r.Method == "POST" {
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log.Println(r.Header)
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header := r.Header["X-Function"]
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log.Println(header)
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exists, err := lookupSwarmService(header[0])
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if err != nil {
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log.Fatalln(err)
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}
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if exists == true {
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requestBody, _ := ioutil.ReadAll(r.Body)
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buf := bytes.NewBuffer(requestBody)
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response, err := http.Post("http://"+header[0]+":"+strconv.Itoa(8080)+"/", "text/plain", buf)
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if err != nil {
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log.Fatalln(err)
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}
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responseBody, _ := ioutil.ReadAll(response.Body)
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w.Write(responseBody)
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metrics.GatewayServerlessServedTotal.Inc()
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metrics.GatewayFunctions.Observe(time.Since(start).Seconds())
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} else {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("Provide an x-function header."))
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}
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}
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}
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}
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func main() {
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GatewayRequestsTotal := prometheus.NewCounter(prometheus.CounterOpts{
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Name: "gateway_requests_total",
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Help: "Total amount of HTTP requests to the gateway",
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})
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GatewayServerlessServedTotal := prometheus.NewCounter(prometheus.CounterOpts{
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Name: "gateway_serverless_invocation_total",
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Help: "Total amount of serverless function invocations",
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})
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GatewayFunctions := prometheus.NewHistogram(prometheus.HistogramOpts{
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Name: "gateway_functions",
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Help: "Gateway functions",
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})
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prometheus.Register(GatewayRequestsTotal)
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prometheus.Register(GatewayServerlessServedTotal)
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prometheus.Register(GatewayFunctions)
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r := mux.NewRouter()
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r.HandleFunc("/", makeProxy(metrics.MetricOptions{
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GatewayRequestsTotal: GatewayRequestsTotal,
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GatewayServerlessServedTotal: GatewayServerlessServedTotal,
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GatewayFunctions: GatewayFunctions,
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}))
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metricsHandler := metrics.PrometheusHandler()
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r.Handle("/metrics", metricsHandler)
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log.Fatal(http.ListenAndServe(":8080", r))
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}
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