fix group commit & introduce date resets

cmd/kaf/group.go

@@ -1,11 +1,11 @@
 package main
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"os"
 	"sort"
-	"time"
 	"unicode"
 
 	"text/tabwriter"
@@ -19,6 +19,10 @@ import (
 	"github.com/Shopify/sarama"
 	"github.com/spf13/cobra"
 
+	"strconv"
+
+	"time"
+
 	"github.com/birdayz/kaf"
 )
 
@@ -112,86 +116,59 @@ func (r *resetHandler) ConsumeClaim(s sarama.ConsumerGroupSession, c sarama.Cons
 
 func createGroupCommitOffsetCmd() *cobra.Command {
 	var topic string
-	var offset int64
+	var offset string
 	var partition int32
 	res := &cobra.Command{
 		Use:  "commit",
 		Args: cobra.ExactArgs(1),
 		Run: func(cmd *cobra.Command, args []string) {
 			client := getClient()
-			config := getConfig()
-			admin := getClusterAdmin()
 
 			group := args[0]
 
-			var memberID string
+			var off int64
 
-			var b *sarama.Broker
-
-			de, err := admin.DescribeConsumerGroups([]string{group})
+			i, err := strconv.ParseInt(offset, 10, 64)
 			if err != nil {
-				errorExit("Failed to fetch consumer group details: %v", err)
-			}
-
-			rr := &sarama.JoinGroupRequest{
-				GroupId:        group,
-				MemberId:       "",
-				SessionTimeout: int32(time.Second * 20 / time.Millisecond),
-				ProtocolType:   de[0].ProtocolType,
-			}
-
-			rr.AddGroupProtocol("", []byte{})
-
-			b, err = client.Coordinator(group)
-			if err != nil {
-				errorExit("Failed to find coordinator for group: %v", err)
-			}
-			_ = b.Open(config)
-
-			resp, err := b.JoinGroup(rr)
-			if err != nil {
-				errorExit("Failed to join group: %v", err)
-			}
-
-			if resp.Err != sarama.ErrNoError {
-				errorExit("Failed to join group: %v", resp.Err)
-			}
+				// No int -> try timestamp
+				t, err := time.Parse(time.RFC3339, offset)
+				if err != nil {
+					errorExit("offset is neither offset nor timestamp", nil)
+				}
+				_ = t
 
-			generationID := resp.GenerationId
-			memberID = resp.MemberId
+				o, err := client.GetOffset(topic, partition, t.UnixNano()/(int64(time.Millisecond)/int64(time.Nanosecond)))
+				if err != nil {
+					errorExit("Failed to determine offset for timestamp: %v", err)
+				}
+				off = o
 
-			commit := &sarama.OffsetCommitRequest{
-				Version:                 1,
-				ConsumerGroup:           group,
-				ConsumerGroupGeneration: generationID,
-				ConsumerID:              memberID,
+				fmt.Printf("Determined offset %v from timestamp.\n", off)
+			} else {
+				off = i
 			}
-			commit.AddBlock(topic, partition, offset, 0, "reset by kaf")
 
-			commitResp, err := b.CommitOffset(commit)
+			g, err := sarama.NewConsumerGroupFromClient(group, client)
 			if err != nil {
-				errorExit("Failed to commit: %v", err)
-			}
-
-			for _, partitionErrors := range commitResp.Errors {
-				for _, _error := range partitionErrors {
-					if _error == sarama.ErrUnknownMemberId {
-						errorExit("Failed to commit: %v", _error)
-					}
-				}
+				errorExit("Failed to create consumer group: %v", err)
 			}
 
+			err = g.Consume(context.Background(), []string{topic}, &resetHandler{
+				topic:     topic,
+				partition: partition,
+				offset:    off,
+				client:    client,
+				group:     group,
+			})
 			if err != nil {
-				errorExit("Failed to set offset: %v", err)
+				errorExit("Failed to commit offset: %v", err)
 			}
 
-			b.LeaveGroup(&sarama.LeaveGroupRequest{GroupId: group, MemberId: memberID})
-
-			fmt.Printf("Set offset to %v.", offset)
+			fmt.Printf("Set offset to %v.", off)
 		},
 	}
 	res.Flags().StringVarP(&topic, "topic", "t", "", "topic")
-	res.Flags().Int64VarP(&offset, "offset", "o", 0, "offset to commit")
+	res.Flags().StringVarP(&offset, "offset", "o", "", "offset to commit")
 	res.Flags().Int32VarP(&partition, "partition", "p", 0, "partition")
 	return res
 }