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client.go
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client.go
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// Copyright 2022 The kubegems.io Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package workflow
import (
"context"
"encoding/json"
"errors"
"path"
"sort"
"github.com/google/uuid"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type Client interface {
SubmitTask(ctx context.Context, task Task) error
ListTasks(ctx context.Context, group, name string) ([]Task, error)
RemoveTask(ctx context.Context, group, name string, uid string) error
WatchTasks(ctx context.Context, group, name string, onchange func(ctx context.Context, task *Task) error) error
}
type DefaultClient struct {
backend Backend
}
func NewClientFromBackend(backend Backend) Client {
cli := &DefaultClient{backend: backend}
return cli
}
func (c *DefaultClient) SubmitTask(ctx context.Context, task Task) error {
if task.Name == "" {
return errors.New("empty task name")
}
task.CreationTimestamp = metav1.Now()
if task.UID == "" {
task.UID = uuid.New().String()
}
if task.Status == nil {
task.Status = &TaskStatus{Status: TaskStatusPending}
}
content, err := json.Marshal(task)
if err != nil {
return err
}
taskjkey := path.Join(task.Group, task.Name, task.UID)
if err := c.backend.Put(ctx, taskjkey, content); err != nil {
return err
}
return c.backend.Pub(ctx, "submit", "", content)
}
func (c *DefaultClient) ListTasks(ctx context.Context, group, name string) ([]Task, error) {
keyprefix := group + "/" + name
if group == "" && name == "" {
keyprefix = ""
}
kvs, err := c.backend.List(ctx, keyprefix)
if err != nil {
return nil, err
}
list := make([]Task, 0, len(kvs))
for _, v := range kvs {
task := Task{}
_ = json.Unmarshal(v, &task)
list = append(list, task)
}
// sort
sort.Slice(list, func(i, j int) bool {
return !list[i].CreationTimestamp.Before(&list[j].CreationTimestamp)
})
return list, nil
}
func (c *DefaultClient) RemoveTask(ctx context.Context, group, name string, uid string) error {
keyprefix := path.Join(group, name, uid)
return c.backend.Del(ctx, keyprefix)
}
func (c *DefaultClient) WatchTasks(ctx context.Context, group, name string, onchange func(ctx context.Context, task *Task) error) error {
keyprefix := group + "/" + name
if group == "" && name == "" {
keyprefix = ""
}
return c.backend.Watch(ctx, keyprefix, func(ctx context.Context, _ string, val []byte) error {
if len(val) == 0 {
// is delete
return nil
}
task := &Task{}
if err := json.Unmarshal(val, task); err != nil {
return err
}
return onchange(ctx, task)
})
}