devlopment branch (#1736)

pkg/simple/client/cache/cache.go

@@ -0,0 +1,60 @@
+package cache
+
+import "time"
+
+type Interface interface {
+	// Keys retrieves all keys match the given pattern
+	Keys(pattern string) ([]string, error)
+
+	// Get retrieves the value of the given key, return error if key doesn't exist
+	Get(key string) (string, error)
+
+	// Set sets the value and living duration of the given key, zero duration means never expire
+	Set(key string, value string, duration time.Duration) error
+
+	// Del deletes the given key, no error returned if the key doesn't exists
+	Del(key string) error
+
+	// Exists checks the existence of a give key
+	Exists(key string) (bool, error)
+
+	// Expires updates object's expiration time, return err if key doesn't exist
+	Expire(key string, duration time.Duration) error
+}
+
+type simpleObject struct {
+	value  string
+	expire time.Time
+}
+
+type SimpleCache struct {
+	store map[string]simpleObject
+}
+
+func NewSimpleCache() Interface {
+	return &SimpleCache{store: make(map[string]simpleObject)}
+}
+
+func (s *SimpleCache) Keys(pattern string) ([]string, error) {
+	panic("implement me")
+}
+
+func (s *SimpleCache) Set(key string, value string, duration time.Duration) error {
+	panic("implement me")
+}
+
+func (s *SimpleCache) Del(key string) error {
+	panic("implement me")
+}
+
+func (s *SimpleCache) Get(key string) (string, error) {
+	return "", nil
+}
+
+func (s *SimpleCache) Exists(key string) (bool, error) {
+	panic("implement me")
+}
+
+func (s *SimpleCache) Expire(key string, duration time.Duration) error {
+	panic("implement me")
+}

pkg/simple/client/cache/options.go

@@ -0,0 +1,46 @@
+package cache
+
+import (
+	"github.com/go-redis/redis"
+	"github.com/spf13/pflag"
+	"kubesphere.io/kubesphere/pkg/utils/reflectutils"
+)
+
+type Options struct {
+	RedisURL string
+}
+
+// NewRedisOptions returns options points to nowhere,
+// because redis is not required for some components
+func NewRedisOptions() *Options {
+	return &Options{
+		RedisURL: "",
+	}
+}
+
+// Validate check options
+func (r *Options) Validate() []error {
+	errors := make([]error, 0)
+
+	_, err := redis.ParseURL(r.RedisURL)
+
+	if err != nil {
+		errors = append(errors, err)
+	}
+
+	return errors
+}
+
+// ApplyTo apply to another options if it's a enabled option(non empty host)
+func (r *Options) ApplyTo(options *Options) {
+	if r.RedisURL != "" {
+		reflectutils.Override(options, r)
+	}
+}
+
+// AddFlags add option flags to command line flags,
+// if redis-host left empty, the following options will be ignored.
+func (r *Options) AddFlags(fs *pflag.FlagSet, s *Options) {
+	fs.StringVar(&r.RedisURL, "redis-url", s.RedisURL, "Redis connection URL. If left blank, means redis is unnecessary, "+
+		"redis will be disabled. e.g. redis://:password@host:port/db")
+}

pkg/simple/client/cache/redis.go

@@ -0,0 +1,87 @@
+/*
+
+ Copyright 2019 The KubeSphere 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 cache
+
+import (
+	"github.com/go-redis/redis"
+	"k8s.io/klog"
+	"time"
+)
+
+type Client struct {
+	client *redis.Client
+}
+
+func NewRedisClient(option *Options, stopCh <-chan struct{}) (Interface, error) {
+	var r Client
+
+	options, err := redis.ParseURL(option.RedisURL)
+
+	if err != nil {
+		klog.Error(err)
+		return nil, err
+	}
+
+	if stopCh == nil {
+		klog.Warningf("no stop signal passed, may cause redis connections leaked")
+	}
+
+	r.client = redis.NewClient(options)
+
+	if err := r.client.Ping().Err(); err != nil {
+		klog.Error("unable to reach redis host", err)
+		r.client.Close()
+		return nil, err
+	}
+
+	// close redis in case of connection leak
+	if stopCh != nil {
+		go func() {
+			<-stopCh
+			if err := r.client.Close(); err != nil {
+				klog.Error(err)
+			}
+		}()
+	}
+
+	return &r, nil
+}
+
+func (r *Client) Get(key string) (string, error) {
+	return "", nil
+}
+
+func (r *Client) Keys(pattern string) ([]string, error) {
+	panic("implement me")
+}
+
+func (r *Client) Set(key string, value string, duration time.Duration) error {
+	panic("implement me")
+}
+
+func (r *Client) Del(key string) error {
+	panic("implement me")
+}
+
+func (r *Client) Exists(key string) (bool, error) {
+	panic("implement me")
+}
+
+func (r *Client) Expire(key string, duration time.Duration) error {
+	panic("implement me")
+}