/
memorymanager.go
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/
memorymanager.go
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// Copyright 2016 IBM Corporation
//
// 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 rules
import (
"errors"
"sync"
"github.com/amalgam8/amalgam8/pkg/api"
"github.com/pborman/uuid"
)
// NewMemoryManager constructs a new in memory manager.
func NewMemoryManager(validator api.Validator) Manager {
return &memory{
rules: make(map[string]map[string]api.Rule),
revision: make(map[string]int64),
validator: validator,
mutex: &sync.Mutex{},
}
}
type memory struct {
rules map[string]map[string]api.Rule
revision map[string]int64
validator api.Validator
mutex *sync.Mutex
}
func (m *memory) AddRules(namespace string, rules []api.Rule) (NewRules, error) {
if len(rules) == 0 {
return NewRules{}, errors.New("rules: no rules provided")
}
// Validate rules
if err := m.validateRules(rules); err != nil {
return NewRules{}, err
}
// Generate IDs
m.generateRuleIDs(rules)
// Add the rules
m.mutex.Lock()
m.addRules(namespace, rules)
m.mutex.Unlock()
// Get the new IDs
ids := make([]string, len(rules))
for i, rule := range rules {
ids[i] = rule.ID
}
return NewRules{
IDs: ids,
}, nil
}
func (m *memory) addRules(namespace string, rules []api.Rule) {
_, exists := m.rules[namespace]
if !exists {
m.rules[namespace] = make(map[string]api.Rule)
}
for _, rule := range rules {
m.rules[namespace][rule.ID] = rule
}
m.revision[namespace]++
}
func (m *memory) GetRules(namespace string, filter api.RuleFilter) (RetrievedRules, error) {
m.mutex.Lock()
revision := m.revision[namespace]
rules, exists := m.rules[namespace]
if !exists {
m.mutex.Unlock()
return RetrievedRules{
Rules: []api.Rule{},
Revision: revision,
}, nil
}
var results []api.Rule
if len(filter.IDs) == 0 {
results = make([]api.Rule, len(m.rules[namespace]))
index := 0
for _, rule := range rules {
results[index] = rule
index++
}
} else {
results = make([]api.Rule, 0, len(filter.IDs))
for _, id := range filter.IDs {
rule, exists := m.rules[namespace][id]
if !exists {
m.mutex.Unlock()
return RetrievedRules{}, errors.New("rule not found")
}
results = append(results, rule)
}
}
m.mutex.Unlock()
results = filter.Apply(results)
return RetrievedRules{
Rules: results,
Revision: revision,
}, nil
}
func (m *memory) UpdateRules(namespace string, rules []api.Rule) error {
if len(rules) == 0 {
return errors.New("rules: no rules provided")
}
// Validate rules
if err := m.validateRules(rules); err != nil {
return err
}
m.mutex.Lock()
defer m.mutex.Unlock()
// Make sure the IDs exist
_, exists := m.rules[namespace]
if !exists {
return errors.New("rules: ID not found")
}
for _, rule := range rules {
_, exists := m.rules[namespace][rule.ID]
if !exists {
return errors.New("rules: ID not found")
}
}
// Update the rules
for _, rule := range rules {
m.rules[namespace][rule.ID] = rule
}
// Update the revision
m.revision[namespace]++
return nil
}
func (m *memory) DeleteRules(namespace string, filter api.RuleFilter) error {
m.mutex.Lock()
defer m.mutex.Unlock()
m.revision[namespace]++
return m.deleteRulesByFilter(namespace, filter)
}
func (m *memory) deleteRulesByFilter(namespace string, filter api.RuleFilter) error {
ruleMap, exists := m.rules[namespace]
if !exists {
return nil
}
rules := make([]api.Rule, len(m.rules[namespace]))
i := 0
for _, rule := range ruleMap {
rules[i] = rule
i++
}
rules = filter.Apply(rules)
for _, rule := range rules {
delete(m.rules[namespace], rule.ID)
}
return nil
}
func (m *memory) generateRuleIDs(rules []api.Rule) {
for i := range rules {
if rules[i].ID == "" {
rules[i].ID = uuid.New() // Generate an ID for each rule
}
}
}
func (m *memory) validateRules(rules []api.Rule) error {
for _, rule := range rules {
if err := m.validator.Validate(rule); err != nil {
return err
}
}
return nil
}