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// SPDX-License-Identifier: GPL-3.0-or-later
package redis
import (
"bufio"
"regexp"
"strconv"
"strings"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/module"
)
const (
infoSectionServer = "# Server"
infoSectionData = "# Data"
infoSectionClients = "# Clients"
infoSectionStats = "# Stats"
infoSectionCommandstats = "# Commandstats"
infoSectionCPU = "# CPU"
infoSectionRepl = "# Replication"
infoSectionKeyspace = "# Keyspace"
)
var infoSections = map[string]struct{}{
infoSectionServer: {},
infoSectionData: {},
infoSectionClients: {},
infoSectionStats: {},
infoSectionCommandstats: {},
infoSectionCPU: {},
infoSectionRepl: {},
infoSectionKeyspace: {},
}
func isInfoSection(line string) bool { _, ok := infoSections[line]; return ok }
func (r *Redis) collectInfo(mx map[string]int64, info string) {
// https://redis.io/commands/info
// Lines can contain a section name (starting with a # character) or a property.
// All the properties are in the form of field:value terminated by \r\n.
var curSection string
sc := bufio.NewScanner(strings.NewReader(info))
for sc.Scan() {
line := strings.TrimSpace(sc.Text())
if len(line) == 0 {
curSection = ""
continue
}
if strings.HasPrefix(line, "#") {
if isInfoSection(line) {
curSection = line
}
continue
}
field, value, ok := parseProperty(line)
if !ok {
continue
}
switch {
case curSection == infoSectionCommandstats:
r.collectInfoCommandstatsProperty(mx, field, value)
case curSection == infoSectionKeyspace:
r.collectInfoKeyspaceProperty(mx, field, value)
case field == "rdb_last_bgsave_status":
collectNumericValue(mx, field, convertBgSaveStatus(value))
case field == "rdb_current_bgsave_time_sec" && value == "-1":
// TODO: https://github.com/netdata/dashboard/issues/198
// "-1" means there is no on-going bgsave operation;
// netdata has 'Convert seconds to time' feature (enabled by default),
// looks like it doesn't respect negative values and does abs().
// "-1" => "00:00:01".
collectNumericValue(mx, field, "0")
case field == "rdb_last_save_time":
v, _ := strconv.ParseInt(value, 10, 64)
mx[field] = int64(time.Since(time.Unix(v, 0)).Seconds())
case field == "aof_enabled" && value == "1":
r.addAOFChartsOnce.Do(r.addAOFCharts)
case field == "master_link_status":
mx["master_link_status_up"] = boolToInt(value == "up")
mx["master_link_status_down"] = boolToInt(value == "down")
default:
collectNumericValue(mx, field, value)
}
}
if has(mx, "keyspace_hits", "keyspace_misses") {
mx["keyspace_hit_rate"] = int64(calcKeyspaceHitRate(mx) * precision)
}
if has(mx, "master_last_io_seconds_ago") {
r.addReplSlaveChartsOnce.Do(r.addReplSlaveCharts)
if !has(mx, "master_link_down_since_seconds") {
mx["master_link_down_since_seconds"] = 0
}
}
}
var reKeyspaceValue = regexp.MustCompile(`^keys=(\d+),expires=(\d+)`)
func (r *Redis) collectInfoKeyspaceProperty(ms map[string]int64, field, value string) {
match := reKeyspaceValue.FindStringSubmatch(value)
if match == nil {
return
}
keys, expires := match[1], match[2]
collectNumericValue(ms, field+"_keys", keys)
collectNumericValue(ms, field+"_expires_keys", expires)
if !r.collectedDbs[field] {
r.collectedDbs[field] = true
r.addDbToKeyspaceCharts(field)
}
}
var reCommandstatsValue = regexp.MustCompile(`^calls=(\d+),usec=(\d+),usec_per_call=([\d.]+)`)
func (r *Redis) collectInfoCommandstatsProperty(ms map[string]int64, field, value string) {
if !strings.HasPrefix(field, "cmdstat_") {
return
}
cmd := field[len("cmdstat_"):]
match := reCommandstatsValue.FindStringSubmatch(value)
if match == nil {
return
}
calls, usec, usecPerCall := match[1], match[2], match[3]
collectNumericValue(ms, "cmd_"+cmd+"_calls", calls)
collectNumericValue(ms, "cmd_"+cmd+"_usec", usec)
collectNumericValue(ms, "cmd_"+cmd+"_usec_per_call", usecPerCall)
if !r.collectedCommands[cmd] {
r.collectedCommands[cmd] = true
r.addCmdToCommandsCharts(cmd)
}
}
func collectNumericValue(ms map[string]int64, field, value string) {
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return
}
if strings.IndexByte(value, '.') == -1 {
ms[field] = int64(v)
} else {
ms[field] = int64(v * precision)
}
}
func convertBgSaveStatus(status string) string {
// https://github.com/redis/redis/blob/unstable/src/server.c
// "ok" or "err"
if status == "ok" {
return "0"
}
return "1"
}
func parseProperty(prop string) (field, value string, ok bool) {
i := strings.IndexByte(prop, ':')
if i == -1 {
return "", "", false
}
field, value = prop[:i], prop[i+1:]
return field, value, field != "" && value != ""
}
func calcKeyspaceHitRate(ms map[string]int64) float64 {
hits := ms["keyspace_hits"]
misses := ms["keyspace_misses"]
if hits+misses == 0 {
return 0
}
return float64(hits) * 100 / float64(hits+misses)
}
func (r *Redis) addCmdToCommandsCharts(cmd string) {
r.addDimToChart(chartCommandsCalls.ID, &module.Dim{
ID: "cmd_" + cmd + "_calls",
Name: strings.ToUpper(cmd),
Algo: module.Incremental,
})
r.addDimToChart(chartCommandsUsec.ID, &module.Dim{
ID: "cmd_" + cmd + "_usec",
Name: strings.ToUpper(cmd),
Algo: module.Incremental,
})
r.addDimToChart(chartCommandsUsecPerSec.ID, &module.Dim{
ID: "cmd_" + cmd + "_usec_per_call",
Name: strings.ToUpper(cmd),
Div: precision,
})
}
func (r *Redis) addDbToKeyspaceCharts(db string) {
r.addDimToChart(chartKeys.ID, &module.Dim{
ID: db + "_keys",
Name: db,
})
r.addDimToChart(chartExpiresKeys.ID, &module.Dim{
ID: db + "_expires_keys",
Name: db,
})
}
func (r *Redis) addDimToChart(chartID string, dim *module.Dim) {
chart := r.Charts().Get(chartID)
if chart == nil {
r.Warningf("error on adding '%s' dimension: can not find '%s' chart", dim.ID, chartID)
return
}
if err := chart.AddDim(dim); err != nil {
r.Warning(err)
return
}
chart.MarkNotCreated()
}
func (r *Redis) addAOFCharts() {
err := r.Charts().Add(chartPersistenceAOFSize.Copy())
if err != nil {
r.Warningf("error on adding '%s' chart", chartPersistenceAOFSize.ID)
}
}
func (r *Redis) addReplSlaveCharts() {
if err := r.Charts().Add(masterLinkStatusChart.Copy()); err != nil {
r.Warningf("error on adding '%s' chart", masterLinkStatusChart.ID)
}
if err := r.Charts().Add(masterLastIOSinceTimeChart.Copy()); err != nil {
r.Warningf("error on adding '%s' chart", masterLastIOSinceTimeChart.ID)
}
if err := r.Charts().Add(masterLinkDownSinceTimeChart.Copy()); err != nil {
r.Warningf("error on adding '%s' chart", masterLinkDownSinceTimeChart.ID)
}
}
func has(m map[string]int64, key string, keys ...string) bool {
switch _, ok := m[key]; len(keys) {
case 0:
return ok
default:
return ok && has(m, keys[0], keys[1:]...)
}
}
func boolToInt(v bool) int64 {
if v {
return 1
}
return 0
}
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