Specify Linux constraints by default

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

gateway/handlers/deletehandler.go

@@ -0,0 +1,82 @@
+// Copyright (c) Alex Ellis 2017. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+package handlers
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+
+	"io/ioutil"
+
+	"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"
+)
+
+func MakeDeleteFunctionHandler(metricsOptions metrics.MetricOptions, c *client.Client) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+
+		req := requests.DeleteFunctionRequest{}
+		defer r.Body.Close()
+		reqData, _ := ioutil.ReadAll(r.Body)
+		unmarshalErr := json.Unmarshal(reqData, &req)
+
+		if (len(req.FunctionName) == 0) || unmarshalErr != nil {
+			log.Printf("Error parsing request to remove service: %s\n", unmarshalErr)
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		log.Printf("Attempting to remove service %s\n", req.FunctionName)
+
+		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 serviceIDs []string
+		for _, service := range services {
+			isFunction := len(service.Spec.TaskTemplate.ContainerSpec.Labels["function"]) > 0
+
+			if isFunction && req.FunctionName == service.Spec.Name {
+				serviceIDs = append(serviceIDs, service.ID)
+			}
+		}
+
+		log.Println(len(serviceIDs))
+		if len(serviceIDs) == 0 {
+			w.WriteHeader(http.StatusNotFound)
+			w.Write([]byte(fmt.Sprintf("No such service found: %s.", req.FunctionName)))
+			return
+		}
+
+		var serviceRemoveErrors []error
+		for _, serviceID := range serviceIDs {
+			err := c.ServiceRemove(context.Background(), serviceID)
+			if err != nil {
+				serviceRemoveErrors = append(serviceRemoveErrors, err)
+			}
+		}
+
+		if len(serviceRemoveErrors) > 0 {
+			log.Printf("Error(s) removing service: %s\n", req.FunctionName)
+			log.Println(serviceRemoveErrors)
+			w.WriteHeader(http.StatusInternalServerError)
+		} else {
+			w.WriteHeader(http.StatusOK)
+		}
+
+	}
+}