CERNBox REST driver for groupprovider service

changelog/unreleased/cbox-groups-rest-driver.md

@@ -0,0 +1,3 @@
+Enhancement: CERNBox REST driver for groupprovider service
+
+https://github.com/cs3org/reva/pull/1434

pkg/cbox/group/rest/cache.go

@@ -0,0 +1,173 @@
+// Copyright 2018-2021 CERN
+//
+// 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.
+//
+// In applying this license, CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+package rest
+
+import (
+	"encoding/json"
+	"errors"
+	"strconv"
+	"time"
+
+	grouppb "github.com/cs3org/go-cs3apis/cs3/identity/group/v1beta1"
+	userpb "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
+	"github.com/gomodule/redigo/redis"
+)
+
+const (
+	groupPrefix           = "group:"
+	groupMembersPrefix    = "members:"
+	groupInternalIDPrefix = "internal:"
+)
+
+func initRedisPool(address, username, password string) *redis.Pool {
+	return &redis.Pool{
+
+		MaxIdle:     50,
+		MaxActive:   1000,
+		IdleTimeout: 240 * time.Second,
+
+		Dial: func() (redis.Conn, error) {
+			var c redis.Conn
+			var err error
+			switch {
+			case username != "":
+				c, err = redis.Dial("tcp", address,
+					redis.DialUsername(username),
+					redis.DialPassword(password),
+				)
+			case password != "":
+				c, err = redis.Dial("tcp", address,
+					redis.DialPassword(password),
+				)
+			default:
+				c, err = redis.Dial("tcp", address)
+			}
+
+			if err != nil {
+				return nil, err
+			}
+			return c, err
+		},
+
+		TestOnBorrow: func(c redis.Conn, t time.Time) error {
+			_, err := c.Do("PING")
+			return err
+		},
+	}
+}
+
+func (m *manager) setVal(key, val string, expiration int) error {
+	conn := m.redisPool.Get()
+	defer conn.Close()
+	if conn != nil {
+		if expiration != -1 {
+			if _, err := conn.Do("SET", key, val, "EX", expiration); err != nil {
+				return err
+			}
+		} else {
+			if _, err := conn.Do("SET", key, val); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+	return errors.New("rest: unable to get connection from redis pool")
+}
+
+func (m *manager) getVal(key string) (string, error) {
+	conn := m.redisPool.Get()
+	defer conn.Close()
+	if conn != nil {
+		val, err := redis.String(conn.Do("GET", key))
+		if err != nil {
+			return "", err
+		}
+		return val, nil
+	}
+	return "", errors.New("rest: unable to get connection from redis pool")
+}
+
+func (m *manager) fetchCachedInternalID(gid *grouppb.GroupId) (string, error) {
+	return m.getVal(groupPrefix + groupInternalIDPrefix + gid.OpaqueId)
+}
+
+func (m *manager) cacheInternalID(gid *grouppb.GroupId, internalID string) error {
+	return m.setVal(groupPrefix+groupInternalIDPrefix+gid.OpaqueId, internalID, -1)
+}
+
+func (m *manager) fetchCachedGroupDetails(gid *grouppb.GroupId) (*grouppb.Group, error) {
+	group, err := m.getVal(groupPrefix + gid.OpaqueId)
+	if err != nil {
+		return nil, err
+	}
+
+	g := grouppb.Group{}
+	if err = json.Unmarshal([]byte(group), &g); err != nil {
+		return nil, err
+	}
+	return &g, nil
+}
+
+func (m *manager) cacheGroupDetails(g *grouppb.Group) error {
+	encodedGroup, err := json.Marshal(&g)
+	if err != nil {
+		return err
+	}
+	if err = m.setVal(groupPrefix+g.Id.OpaqueId, string(encodedGroup), -1); err != nil {
+		return err
+	}
+
+	if err = m.setVal(groupPrefix+"gid_number:"+strconv.FormatInt(g.GidNumber, 10), g.Id.OpaqueId, -1); err != nil {
+		return err
+	}
+	if err = m.setVal(groupPrefix+"mail:"+g.Mail, g.Id.OpaqueId, -1); err != nil {
+		return err
+	}
+	if err = m.setVal(groupPrefix+"group_name:"+g.GroupName, g.Id.OpaqueId, -1); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *manager) fetchCachedParam(field, claim string) (string, error) {
+	return m.getVal(groupPrefix + field + ":" + claim)
+}
+
+func (m *manager) fetchCachedGroupMembers(gid *grouppb.GroupId) ([]*userpb.UserId, error) {
+	members, err := m.getVal(groupPrefix + groupMembersPrefix + gid.OpaqueId)
+	if err != nil {
+		return nil, err
+	}
+	u := []*userpb.UserId{}
+	if err = json.Unmarshal([]byte(members), &u); err != nil {
+		return nil, err
+	}
+	return u, nil
+}
+
+func (m *manager) cacheGroupMembers(gid *grouppb.GroupId, members []*userpb.UserId) error {
+	u, err := json.Marshal(&members)
+	if err != nil {
+		return err
+	}
+	if err = m.setVal(groupPrefix+groupMembersPrefix+gid.OpaqueId, string(u), m.conf.GroupMembersCacheExpiration*60); err != nil {
+		return err
+	}
+	return nil
+}