45 lines
1 KiB
Go
45 lines
1 KiB
Go
package etl
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import (
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"fmt"
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"github.com/hoisie/redis"
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)
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type Checkpoint interface {
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CheckpointExists(streamName string, shardID string) bool
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SequenceNumber() string
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SetCheckpoint(streamName string, shardID string, sequenceNumber string)
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}
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type RedisCheckpoint struct {
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appName string
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client redis.Client
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sequenceNumber string
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}
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func (c RedisCheckpoint) SequenceNumber() string {
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return c.sequenceNumber
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}
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func (c *RedisCheckpoint) CheckpointExists(streamName string, shardID string) bool {
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key := c.keyGen(streamName, shardID)
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val, _ := c.client.Get(key)
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if val != nil {
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c.sequenceNumber = string(val)
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return true
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} else {
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return false
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}
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}
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func (c *RedisCheckpoint) SetCheckpoint(streamName string, shardID string, sequenceNumber string) {
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key := c.keyGen(streamName, shardID)
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c.client.Set(key, []byte(sequenceNumber))
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c.sequenceNumber = sequenceNumber
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}
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func (c RedisCheckpoint) keyGen(streamName string, shardID string) string {
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return fmt.Sprintf("%v:checkpoint:%v:%v", c.appName, streamName, shardID)
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}
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