Fix unhandled range error and extend deletion timeout

Fixes a bug when attempting to access a non-existant IP from
GetIPfromPID called via the list API.

Renames the provider from faas-containerd

Updates function deletion grace period to 30s to prevent any
errors in the REST API during a long-running deletion.

Tested on Linux with the figlet function which by default takes
around 5s to delete due to its write_timeout value, the deletion
now blocks rather than throwing an error.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

pkg/provider/handlers/cni_network.go

@@ -161,8 +161,12 @@ func GetIPfromPID(pid int) (*net.IP, error) {
 	if addrsErr != nil {
 		return nil, fmt.Errorf("unable to find address for veth pair using: %v %s", peerIDs, addrsErr)
 	}
-	return &addrs[0].CIDRs[0].IP, nil
 
+	if len(addrs) > 0 && len(addrs[0].CIDRs) > 0 {
+		return &addrs[0].CIDRs[0].IP, nil
+	}
+
+	return nil, fmt.Errorf("no IP found for function")
 }
 
 // NetID generates the network IF based on task name and task PID

pkg/provider/handlers/containers.go

@@ -60,8 +60,13 @@ func GetFunction(client *containerd.Client, name string) (Function, error) {
 			if svc.Status == "running" {
 				replicas = 1
 				f.pid = task.Pid()
+
 				// Get container IP address
-				ip, _ := GetIPfromPID(int(task.Pid()))
+				ip, getIPErr := GetIPfromPID(int(task.Pid()))
+				if getIPErr != nil {
+					return Function{}, getIPErr
+				}
+
 				f.IP = ip.String()
 			}
 		} else {

pkg/provider/handlers/delete.go

@@ -49,6 +49,8 @@ func MakeDeleteHandler(client *containerd.Client, cni gocni.CNI) func(w http.Res
 		}
 
 		ctx := namespaces.WithNamespace(context.Background(), FunctionNamespace)
+
+		// TODO: this needs to still happen if the task is paused
 		if function.replicas != 0 {
 			err = DeleteCNINetwork(ctx, cni, client, name)
 			if err != nil {

pkg/provider/handlers/info.go

@@ -8,10 +8,11 @@ import (
 )
 
 const (
-	//OrchestrationIdentifier identifier string for provider orchestration
+	// OrchestrationIdentifier identifier string for provider orchestration
 	OrchestrationIdentifier = "containerd"
-	//ProviderName name of the provider
-	ProviderName = "faas-containerd"
+
+	// ProviderName name of the provider
+	ProviderName = "faasd"
 )
 
 //MakeInfoHandler creates handler for /system/info endpoint