1 files changed, 74 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/modules/zookeeper/fetcher.go b/src/go/collectors/go.d.plugin/modules/zookeeper/fetcher.go
new file mode 100644
index 000000000..be821e622
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/zookeeper/fetcher.go
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package zookeeper
+
+import (
+	"bytes"
+	"fmt"
+	"unsafe"
+
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/socket"
+)
+
+const limitReadLines = 2000
+
+type zookeeperFetcher struct {
+	socket.Client
+}
+
+func (c *zookeeperFetcher) fetch(command string) (rows []string, err error) {
+	if err = c.Connect(); err != nil {
+		return nil, err
+	}
+	defer func() { _ = c.Disconnect() }()
+
+	var num int
+	clientErr := c.Command(command, func(b []byte) bool {
+		if !isZKLine(b) || isMntrLineOK(b) {
+			rows = append(rows, string(b))
+		}
+		if num += 1; num >= limitReadLines {
+			err = fmt.Errorf("read line limit exceeded (%d)", limitReadLines)
+			return false
+		}
+		return true
+	})
+	if clientErr != nil {
+		return nil, clientErr
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return rows, nil
+}
+
+func isZKLine(line []byte) bool {
+	return bytes.HasPrefix(line, []byte("zk_"))
+}
+
+func isMntrLineOK(line []byte) bool {
+	idx := bytes.LastIndexByte(line, '\t')
+	return idx > 0 && collectedZKKeys[unsafeString(line)[:idx]]
+}
+
+func unsafeString(b []byte) string {
+	return *((*string)(unsafe.Pointer(&b)))
+}
+
+var collectedZKKeys = map[string]bool{
+	"zk_num_alive_connections":      true,
+	"zk_outstanding_requests":       true,
+	"zk_min_latency":                true,
+	"zk_avg_latency":                true,
+	"zk_max_latency":                true,
+	"zk_packets_received":           true,
+	"zk_packets_sent":               true,
+	"zk_open_file_descriptor_count": true,
+	"zk_max_file_descriptor_count":  true,
+	"zk_znode_count":                true,
+	"zk_ephemerals_count":           true,
+	"zk_watch_count":                true,
+	"zk_approximate_data_size":      true,
+	"zk_server_state":               true,
+}