Add more tests (#1949)

* add more test code

* add more test code

pkg/simple/client/cache/simple_cache.go

@@ -1,40 +1,111 @@
 package cache
 
-import "time"
+import (
+	"kubesphere.io/kubesphere/pkg/server/errors"
+	"regexp"
+	"strings"
+	"time"
+)
+
+var ErrNoSuchKey = errors.New("no such key")
 
 type simpleObject struct {
-	value  string
-	expire time.Time
+	value       string
+	neverExpire bool
+	expiredAt   time.Time
 }
 
-type SimpleCache struct {
+// SimpleCache implements cache.Interface use memory objects, it should be used only for testing
+type simpleCache struct {
 	store map[string]simpleObject
 }
 
 func NewSimpleCache() Interface {
-	return &SimpleCache{store: make(map[string]simpleObject)}
+	return &simpleCache{store: make(map[string]simpleObject)}
 }
 
-func (s *SimpleCache) Keys(pattern string) ([]string, error) {
-	panic("implement me")
+func (s *simpleCache) Keys(pattern string) ([]string, error) {
+	// There is a little difference between go regexp and redis key pattern
+	// In redis, * means any character, while in go . means match everything.
+	pattern = strings.Replace(pattern, "*", ".", -1)
+
+	re, err := regexp.Compile(pattern)
+	if err != nil {
+		return nil, err
+	}
+	var keys []string
+	for k, _ := range s.store {
+		if re.MatchString(k) {
+			keys = append(keys, k)
+		}
+	}
+
+	return keys, nil
 }
 
-func (s *SimpleCache) Set(key string, value string, duration time.Duration) error {
-	panic("implement me")
+func (s *simpleCache) Set(key string, value string, duration time.Duration) error {
+	sobject := simpleObject{
+		value:       value,
+		neverExpire: false,
+		expiredAt:   time.Now().Add(duration),
+	}
+
+	if duration == NeverExpire {
+		sobject.neverExpire = true
+	}
+
+	s.store[key] = sobject
+	return nil
 }
 
-func (s *SimpleCache) Del(keys ...string) error {
-	panic("implement me")
+func (s *simpleCache) Del(keys ...string) error {
+	for _, key := range keys {
+		if _, ok := s.store[key]; ok {
+			delete(s.store, key)
+		} else {
+			return ErrNoSuchKey
+		}
+	}
+
+	return nil
 }
 
-func (s *SimpleCache) Get(key string) (string, error) {
-	return "", nil
+func (s *simpleCache) Get(key string) (string, error) {
+	if sobject, ok := s.store[key]; ok {
+		if sobject.neverExpire || time.Now().Before(sobject.expiredAt) {
+			return sobject.value, nil
+		}
+	}
+
+	return "", ErrNoSuchKey
 }
 
-func (s *SimpleCache) Exists(keys ...string) (bool, error) {
-	panic("implement me")
+func (s *simpleCache) Exists(keys ...string) (bool, error) {
+	for _, key := range keys {
+		if _, ok := s.store[key]; !ok {
+			return false, ErrNoSuchKey
+		}
+	}
+
+	return true, nil
 }
 
-func (s *SimpleCache) Expire(key string, duration time.Duration) error {
-	panic("implement me")
+func (s *simpleCache) Expire(key string, duration time.Duration) error {
+	value, err := s.Get(key)
+	if err != nil {
+		return err
+	}
+
+	sobject := simpleObject{
+		value:       value,
+		neverExpire: false,
+		expiredAt:   time.Now().Add(duration),
+	}
+
+	if duration == NeverExpire {
+		sobject.neverExpire = true
+	}
+
+	s.store[key] = sobject
+	return nil
 }