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https://github.com/openfaas/faasd.git
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40829bbf88
This patch reports stopped tasks as having zero scale, which means the gateway will send a "scale up" request, the same way as it does for paused containers, or those which have no task due to a reboot of the machine. The scale up logic will now delete the stopped task and recreate the task. Tested with nodeinfo and figlet on a Dell XPS with Ubuntu 16.04. The scaling logic has been re-written, but re-tested by manually pausing and manually removing the task of a container. Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package handlers
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import (
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"context"
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"fmt"
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"log"
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"github.com/containerd/containerd"
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"github.com/containerd/containerd/namespaces"
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"github.com/openfaas/faasd/pkg/cninetwork"
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faasd "github.com/openfaas/faasd/pkg"
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)
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type Function struct {
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name string
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namespace string
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image string
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pid uint32
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replicas int
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IP string
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labels map[string]string
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}
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// ListFunctions returns a map of all functions with running tasks on namespace
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func ListFunctions(client *containerd.Client) (map[string]Function, error) {
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ctx := namespaces.WithNamespace(context.Background(), faasd.FunctionNamespace)
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functions := make(map[string]Function)
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containers, _ := client.Containers(ctx)
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for _, k := range containers {
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name := k.ID()
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f, err := GetFunction(client, name)
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if err != nil {
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continue
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}
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functions[name] = f
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}
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return functions, nil
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}
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// GetFunction returns a function that matches name
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func GetFunction(client *containerd.Client, name string) (Function, error) {
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ctx := namespaces.WithNamespace(context.Background(), faasd.FunctionNamespace)
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c, err := client.LoadContainer(ctx, name)
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if err == nil {
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image, _ := c.Image(ctx)
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containerName := c.ID()
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labels, labelErr := c.Labels(ctx)
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if labelErr != nil {
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log.Printf("cannot list container %s labels: %s", containerName, labelErr.Error())
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}
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f := Function{
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name: containerName,
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namespace: faasd.FunctionNamespace,
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image: image.Name(),
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labels: labels,
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}
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replicas := 0
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task, err := c.Task(ctx, nil)
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if err == nil {
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// Task for container exists
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svc, err := task.Status(ctx)
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if err != nil {
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return Function{}, fmt.Errorf("unable to get task status for container: %s %s", name, err)
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}
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if svc.Status == "running" {
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replicas = 1
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f.pid = task.Pid()
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// Get container IP address
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ip, err := cninetwork.GetIPfromPID(int(task.Pid()))
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if err != nil {
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return Function{}, err
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}
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f.IP = ip.String()
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}
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} else {
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replicas = 0
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}
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f.replicas = replicas
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return f, nil
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}
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return Function{}, fmt.Errorf("unable to find function: %s, error %s", name, err)
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}
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