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224 lines
5.5 KiB
224 lines
5.5 KiB
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"time"
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"github.com/Sirupsen/logrus"
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"github.com/garyburd/redigo/redis"
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)
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func makeRedisError(msg string, a ...interface{}) error {
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s := fmt.Sprintf(msg, a...)
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return fmt.Errorf("Redis Notifier Error: %s", s)
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}
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var (
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rdNFormatError = makeRedisError(`"format" value is invalid - it must be one of "access" or "namespace".`)
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rdNKeyError = makeRedisError("Key was not specified in the configuration.")
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)
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// redisNotify to send logs to Redis server
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type redisNotify struct {
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Enable bool `json:"enable"`
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Format string `json:"format"`
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Addr string `json:"address"`
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Password string `json:"password"`
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Key string `json:"key"`
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}
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func (r *redisNotify) Validate() error {
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if !r.Enable {
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return nil
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}
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if r.Format != formatNamespace && r.Format != formatAccess {
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return rdNFormatError
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}
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if _, err := checkURL(r.Addr); err != nil {
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return err
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}
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if r.Key == "" {
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return rdNKeyError
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}
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return nil
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}
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type redisConn struct {
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*redis.Pool
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params redisNotify
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}
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// Dial a new connection to redis instance at addr, optionally with a
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// password if any.
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func dialRedis(rNotify redisNotify) (*redis.Pool, error) {
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// Return error if redis not enabled.
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if !rNotify.Enable {
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return nil, errNotifyNotEnabled
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}
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addr := rNotify.Addr
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password := rNotify.Password
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rPool := &redis.Pool{
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MaxIdle: 3,
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IdleTimeout: 240 * time.Second, // Time 2minutes.
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Dial: func() (redis.Conn, error) {
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c, err := redis.Dial("tcp", addr)
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if err != nil {
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return nil, err
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}
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if password != "" {
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if _, derr := c.Do("AUTH", password); derr != nil {
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c.Close()
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return nil, derr
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}
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}
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return c, err
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},
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TestOnBorrow: func(c redis.Conn, t time.Time) error {
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_, err := c.Do("PING")
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return err
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},
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}
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// Test if connection with REDIS can be established.
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rConn := rPool.Get()
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defer rConn.Close()
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// Check connection.
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_, err := rConn.Do("PING")
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if err != nil {
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return nil, makeRedisError("Error connecting to server: %v", err)
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}
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// Test that Key is of desired type
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reply, err := redis.String(rConn.Do("TYPE", rNotify.Key))
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if err != nil {
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return nil, makeRedisError("Error getting type of Key=%s: %v",
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rNotify.Key, err)
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}
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if reply != "none" {
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expectedType := "hash"
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if rNotify.Format == formatAccess {
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expectedType = "list"
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}
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if reply != expectedType {
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return nil, makeRedisError(
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"Key=%s has type %s, but we expect it to be a %s",
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rNotify.Key, reply, expectedType)
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}
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}
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// Return pool.
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return rPool, nil
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}
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func newRedisNotify(accountID string) (*logrus.Logger, error) {
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rNotify := serverConfig.Notify.GetRedisByID(accountID)
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// Dial redis.
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rPool, err := dialRedis(rNotify)
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if err != nil {
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return nil, err
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}
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rrConn := redisConn{
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Pool: rPool,
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params: rNotify,
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}
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redisLog := logrus.New()
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redisLog.Out = ioutil.Discard
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// Set default JSON formatter.
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redisLog.Formatter = new(logrus.JSONFormatter)
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redisLog.Hooks.Add(rrConn)
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// Success, redis enabled.
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return redisLog, nil
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}
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// Fire is called when an event should be sent to the message broker.
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func (r redisConn) Fire(entry *logrus.Entry) error {
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rConn := r.Pool.Get()
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defer rConn.Close()
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// Fetch event type upon reflecting on its original type.
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entryStr, ok := entry.Data["EventType"].(string)
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if !ok {
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return nil
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}
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switch r.params.Format {
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case formatNamespace:
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// Match the event if its a delete request, attempt to delete the key
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if eventMatch(entryStr, []string{"s3:ObjectRemoved:*"}) {
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_, err := rConn.Do("HDEL", r.params.Key, entry.Data["Key"])
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if err != nil {
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return makeRedisError("Error deleting entry: %v",
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err)
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}
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return nil
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} // else save this as new entry or update any existing ones.
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value, err := json.Marshal(map[string]interface{}{
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"Records": entry.Data["Records"],
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})
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if err != nil {
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return makeRedisError(
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"Unable to encode event %v to JSON: %v",
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entry.Data["Records"], err)
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}
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_, err = rConn.Do("HSET", r.params.Key, entry.Data["Key"],
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value)
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if err != nil {
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return makeRedisError("Error updating hash entry: %v",
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err)
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}
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case formatAccess:
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// eventTime is taken from the first entry in the
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// records.
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events, ok := entry.Data["Records"].([]NotificationEvent)
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if !ok {
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return makeRedisError("unable to extract event time due to conversion error of entry.Data[\"Records\"]=%v", entry.Data["Records"])
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}
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eventTime := events[0].EventTime
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listEntry := []interface{}{eventTime, entry.Data["Records"]}
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jsonValue, err := json.Marshal(listEntry)
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if err != nil {
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return makeRedisError("JSON encoding error: %v", err)
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}
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_, err = rConn.Do("RPUSH", r.params.Key, jsonValue)
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if err != nil {
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return makeRedisError("Error appending to Redis list: %v",
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err)
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}
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}
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return nil
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}
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// Required for logrus hook implementation
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func (r redisConn) Levels() []logrus.Level {
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return []logrus.Level{
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logrus.InfoLevel,
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}
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}
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