Add CCR stuff, fix search, add docs support, support index maps, refactor (#13)

pkg/es/ccr_follower.go

@@ -0,0 +1,106 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package es
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+)
+
+func CcrFollowerAdd(conf *cfg.Config, index string) error {
+	res, err := conf.DefaultCluster.ES.Cluster.RemoteInfo().
+		Header("content-type", "application/json").
+		Header("accept", "application/json").
+		Do(context.Background())
+	if err != nil {
+		return fmt.Errorf("failed to retrieve follower info: %s", err)
+	}
+
+	remote := ""
+	for name := range res {
+		remote = name
+		break
+	}
+
+	if remote == "" {
+		return fmt.Errorf("cluster doesn't have a follower: %s", err)
+	}
+
+	create := conf.DefaultCluster.ES.Ccr.Follow(index).
+		LeaderIndex(index).
+		RemoteCluster(remote).
+		Header("content-type", "application/json").
+		Header("accept", "application/json")
+
+	if conf.Wait {
+		create.WaitForActiveShards("all")
+	}
+
+	_, err = create.Do(context.Background())
+
+	if err != nil {
+		return fmt.Errorf("failed to create follower index: %s", err)
+	}
+
+	return nil
+}
+
+func CcrFollowerShow(conf *cfg.Config, index string) error {
+	res, err := conf.DefaultCluster.ES.Ccr.FollowStats(index).
+		Header("content-type", "application/json").
+		Header("accept", "application/json").
+		Do(context.Background())
+	if err != nil {
+		return fmt.Errorf("failed to retrieve follower index info: %s", err)
+	}
+
+	slog.Debug("ES result", "follower stats", res.Indices)
+
+	if len(res.Indices) == 0 {
+		return fmt.Errorf("cluster did not return any follower stats for index %s", index)
+	}
+
+	if len(res.Indices[0].Shards) == 0 {
+		return fmt.Errorf("cluster did not return any shard stats on follower index %s", index)
+	}
+
+	follower := res.Indices[0].Shards[0]
+
+	table := NewTable(2, 9)
+	table.Addheaders("field", "value")
+
+	table.entries = [][]string{
+		{"name", index},
+		{"remote_cluster", follower.RemoteCluster},
+		{"leader_checkpoint", fmt.Sprintf("%d", follower.LeaderGlobalCheckpoint)},
+		{"follower_checkpoint", fmt.Sprintf("%d", follower.FollowerGlobalCheckpoint)},
+		{"bytes_read", fmt.Sprintf("%d", follower.BytesRead)},
+		{"failed_read_requests", fmt.Sprintf("%d", follower.FailedReadRequests)},
+		{"failed_write_requests", fmt.Sprintf("%d", follower.FailedWriteRequests)},
+		{"successful_read_requests", fmt.Sprintf("%d", follower.SuccessfulReadRequests)},
+		{"successful_write_requests", fmt.Sprintf("%d", follower.SuccessfulWriteRequests)},
+	}
+
+	if err := table.PrintMarkdown(); err != nil {
+		return err
+	}
+
+	return nil
+}