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// SPDX-License-Identifier: GPL-3.0-or-later
package redis
import (
"bufio"
"context"
"errors"
"fmt"
"github.com/blang/semver/v4"
"regexp"
"strings"
)
const precision = 1000 // float values multiplier and dimensions divisor
func (r *Redis) collect() (map[string]int64, error) {
info, err := r.rdb.Info(context.Background(), "all").Result()
if err != nil {
return nil, err
}
if r.server == "" {
s, v, err := extractServerVersion(info)
if err != nil {
return nil, fmt.Errorf("can not extract server app and version: %v", err)
}
r.server, r.version = s, v
r.Debugf(`server="%s",version="%s"`, s, v)
}
if r.server != "redis" {
return nil, fmt.Errorf("unsupported server app, want=redis, got=%s", r.server)
}
mx := make(map[string]int64)
r.collectInfo(mx, info)
r.collectPingLatency(mx)
return mx, nil
}
// redis_version:6.0.9
var reVersion = regexp.MustCompile(`([a-z]+)_version:(\d+\.\d+\.\d+)`)
func extractServerVersion(info string) (string, *semver.Version, error) {
var versionLine string
for sc := bufio.NewScanner(strings.NewReader(info)); sc.Scan(); {
line := sc.Text()
if strings.Contains(line, "_version") {
versionLine = strings.TrimSpace(line)
break
}
}
if versionLine == "" {
return "", nil, errors.New("no version property")
}
match := reVersion.FindStringSubmatch(versionLine)
if match == nil {
return "", nil, fmt.Errorf("can not parse version property '%s'", versionLine)
}
server, version := match[1], match[2]
ver, err := semver.New(version)
if err != nil {
return "", nil, err
}
return server, ver, nil
}
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