Add EnvProcess and logo to UI

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

gateway/handlers/reader.go

@@ -0,0 +1,67 @@
+package handlers
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"strings"
+
+	"github.com/alexellis/faas/gateway/metrics"
+	"github.com/alexellis/faas/gateway/requests"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/client"
+)
+
+// MakeFunctionReader gives a summary of Function structs with Docker service stats overlaid with Prometheus counters.
+func MakeFunctionReader(metricsOptions metrics.MetricOptions, c *client.Client) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+
+		serviceFilter := filters.NewArgs()
+
+		options := types.ServiceListOptions{
+			Filters: serviceFilter,
+		}
+
+		services, err := c.ServiceList(context.Background(), options)
+		if err != nil {
+			fmt.Println(err)
+		}
+
+		// TODO: Filter only "faas" functions (via metadata?)
+		var functions []requests.Function
+
+		for _, service := range services {
+
+			if len(service.Spec.TaskTemplate.ContainerSpec.Labels["function"]) > 0 {
+				invocations := getCounterValue(service.Spec.Name, "200", &metricsOptions) +
+					getCounterValue(service.Spec.Name, "500", &metricsOptions)
+
+				var envProcess string
+
+				for _, env := range service.Spec.TaskTemplate.ContainerSpec.Env {
+					if strings.Index(env, "fprocess=") > -1 {
+						envProcess = env[len("fprocess="):]
+					}
+				}
+
+				f := requests.Function{
+					Name:            service.Spec.Name,
+					Image:           service.Spec.TaskTemplate.ContainerSpec.Image,
+					InvocationCount: invocations,
+					Replicas:        *service.Spec.Mode.Replicated.Replicas,
+					EnvProcess:      envProcess,
+				}
+
+				functions = append(functions, f)
+			}
+		}
+
+		functionBytes, _ := json.Marshal(functions)
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(200)
+		w.Write(functionBytes)
+	}
+}