mirror of
https://github.com/grafana/grafana.git
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119 lines
3.3 KiB
Go
119 lines
3.3 KiB
Go
package remotecache
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import (
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"context"
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"crypto/tls"
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"fmt"
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"strconv"
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"strings"
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"time"
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"github.com/go-redis/redis/v8"
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"github.com/grafana/grafana/pkg/setting"
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)
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const redisCacheType = "redis"
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type redisStorage struct {
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c *redis.Client
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}
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// parseRedisConnStr parses k=v pairs in csv and builds a redis Options object
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func parseRedisConnStr(connStr string) (*redis.Options, error) {
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keyValueCSV := strings.Split(connStr, ",")
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options := &redis.Options{Network: "tcp"}
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setTLSIsTrue := false
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for _, rawKeyValue := range keyValueCSV {
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keyValueTuple := strings.SplitN(rawKeyValue, "=", 2)
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if len(keyValueTuple) != 2 {
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if strings.HasPrefix(rawKeyValue, "password") {
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// don't log the password
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rawKeyValue = "password" + setting.RedactedPassword
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}
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return nil, fmt.Errorf("incorrect redis connection string format detected for '%v', format is key=value,key=value", rawKeyValue)
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}
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connKey := keyValueTuple[0]
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connVal := keyValueTuple[1]
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switch connKey {
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case "addr":
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options.Addr = connVal
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case "password":
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options.Password = connVal
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case "db":
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i, err := strconv.Atoi(connVal)
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if err != nil {
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return nil, fmt.Errorf("%v: %w", "value for db in redis connection string must be a number", err)
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}
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options.DB = i
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case "pool_size":
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i, err := strconv.Atoi(connVal)
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if err != nil {
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return nil, fmt.Errorf("%v: %w", "value for pool_size in redis connection string must be a number", err)
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}
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options.PoolSize = i
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case "ssl":
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if connVal != "true" && connVal != "false" && connVal != "insecure" {
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return nil, fmt.Errorf("ssl must be set to 'true', 'false', or 'insecure' when present")
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}
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if connVal == "true" {
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setTLSIsTrue = true // Needs addr already parsed, so set later
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}
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if connVal == "insecure" {
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options.TLSConfig = &tls.Config{InsecureSkipVerify: true}
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}
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default:
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return nil, fmt.Errorf("unrecognized option '%v' in redis connection string", connKey)
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}
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}
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if setTLSIsTrue {
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// Get hostname from the Addr property and set it on the configuration for TLS
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sp := strings.Split(options.Addr, ":")
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if len(sp) < 1 {
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return nil, fmt.Errorf("unable to get hostname from the addr field, expected host:port, got '%v'", options.Addr)
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}
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options.TLSConfig = &tls.Config{ServerName: sp[0]}
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}
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return options, nil
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}
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func newRedisStorage(opts *setting.RemoteCacheOptions) (*redisStorage, error) {
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opt, err := parseRedisConnStr(opts.ConnStr)
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if err != nil {
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return nil, err
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}
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return &redisStorage{c: redis.NewClient(opt)}, nil
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}
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// Set sets value to given key in session.
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func (s *redisStorage) Set(ctx context.Context, key string, val interface{}, expires time.Duration) error {
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item := &cachedItem{Val: val}
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value, err := encodeGob(item)
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if err != nil {
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return err
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}
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status := s.c.Set(ctx, key, string(value), expires)
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return status.Err()
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}
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// Get gets value by given key in session.
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func (s *redisStorage) Get(ctx context.Context, key string) (interface{}, error) {
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v := s.c.Get(ctx, key)
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item := &cachedItem{}
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err := decodeGob([]byte(v.Val()), item)
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if err == nil {
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return item.Val, nil
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}
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if err.Error() == "EOF" {
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return nil, ErrCacheItemNotFound
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}
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return nil, err
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}
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// Delete delete a key from session.
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func (s *redisStorage) Delete(ctx context.Context, key string) error {
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cmd := s.c.Del(ctx, key)
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return cmd.Err()
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}
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