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exporter.go
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package main
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net/http"
"net/url"
"regexp"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/gomodule/redigo/redis"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
)
type dbKeyPair struct {
db, key string
}
type keyInfo struct {
size float64
keyType string
}
// Exporter implements the prometheus.Exporter interface, and exports Redis metrics.
type Exporter struct {
sync.Mutex
redisAddr string
namespace string
totalScrapes prometheus.Counter
scrapeDuration prometheus.Summary
targetScrapeRequestErrors prometheus.Counter
metricDescriptions map[string]*prometheus.Desc
options Options
metricMapCounters map[string]string
metricMapGauges map[string]string
mux *http.ServeMux
}
type Options struct {
User string
Password string
Namespace string
ConfigCommandName string
CheckSingleKeys string
CheckKeys string
LuaScript []byte
ClientCertificates []tls.Certificate
CaCertificates *x509.CertPool
InclSystemMetrics bool
SkipTLSVerification bool
SetClientName bool
IsTile38 bool
ExportClientList bool
ConnectionTimeouts time.Duration
MetricsPath string
RedisMetricsOnly bool
PingOnConnect bool
Registry *prometheus.Registry
}
func (e *Exporter) scrapeHandler(w http.ResponseWriter, r *http.Request) {
target := r.URL.Query().Get("target")
if target == "" {
http.Error(w, "'target' parameter must be specified", 400)
e.targetScrapeRequestErrors.Inc()
return
}
if !strings.Contains(target, "://") {
target = "redis://" + target
}
u, err := url.Parse(target)
if err != nil {
http.Error(w, fmt.Sprintf("Invalid 'target' parameter, parse err: %ck ", err), 400)
e.targetScrapeRequestErrors.Inc()
return
}
// get rid of username/password info in "target" so users don't send them in plain text via http
u.User = nil
target = u.String()
opts := e.options
if ck := r.URL.Query().Get("check-keys"); ck != "" {
opts.CheckKeys = ck
}
if csk := r.URL.Query().Get("check-single-keys"); csk != "" {
opts.CheckSingleKeys = csk
}
registry := prometheus.NewRegistry()
opts.Registry = registry
_, err = NewRedisExporter(target, opts)
if err != nil {
http.Error(w, "NewRedisExporter() err: err", 400)
e.targetScrapeRequestErrors.Inc()
return
}
promhttp.HandlerFor(
registry, promhttp.HandlerOpts{ErrorHandling: promhttp.ContinueOnError},
).ServeHTTP(w, r)
}
// splitKeyArgs splits a command-line supplied argument into a slice of dbKeyPairs.
func parseKeyArg(keysArgString string) (keys []dbKeyPair, err error) {
if keysArgString == "" {
return keys, err
}
for _, k := range strings.Split(keysArgString, ",") {
db := "0"
key := ""
frags := strings.Split(k, "=")
switch len(frags) {
case 1:
db = "0"
key, err = url.QueryUnescape(strings.TrimSpace(frags[0]))
case 2:
db = strings.Replace(strings.TrimSpace(frags[0]), "db", "", -1)
key, err = url.QueryUnescape(strings.TrimSpace(frags[1]))
default:
return keys, fmt.Errorf("invalid key list argument: %s", k)
}
if err != nil {
return keys, fmt.Errorf("couldn't parse db/key string: %s", k)
}
keys = append(keys, dbKeyPair{db, key})
}
return keys, err
}
func newMetricDescr(namespace string, metricName string, docString string, labels []string) *prometheus.Desc {
return prometheus.NewDesc(prometheus.BuildFQName(namespace, "", metricName), docString, labels, nil)
}
// NewRedisExporter returns a new exporter of Redis metrics.
func NewRedisExporter(redisURI string, opts Options) (*Exporter, error) {
log.Debugf("NewRedisExporter options: %#v", opts)
e := &Exporter{
redisAddr: redisURI,
options: opts,
namespace: opts.Namespace,
totalScrapes: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: opts.Namespace,
Name: "exporter_scrapes_total",
Help: "Current total redis scrapes.",
}),
scrapeDuration: prometheus.NewSummary(prometheus.SummaryOpts{
Namespace: opts.Namespace,
Name: "exporter_scrape_duration_seconds",
Help: "Durations of scrapes by the exporter",
}),
targetScrapeRequestErrors: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: opts.Namespace,
Name: "target_scrape_request_errors_total",
Help: "Errors in requests to the exporter",
}),
metricMapGauges: map[string]string{
// # Server
"uptime_in_seconds": "uptime_in_seconds",
"process_id": "process_id",
// # Clients
"connected_clients": "connected_clients",
"blocked_clients": "blocked_clients",
"tracking_clients": "tracking_clients",
// redis 2,3,4.x
"client_longest_output_list": "client_longest_output_list",
"client_biggest_input_buf": "client_biggest_input_buf",
// the above two metrics were renamed in redis 5.x
"client_recent_max_output_buffer": "client_recent_max_output_buffer_bytes",
"client_recent_max_input_buffer": "client_recent_max_input_buffer_bytes",
// # Memory
"allocator_active": "allocator_active_bytes",
"allocator_allocated": "allocator_allocated_bytes",
"allocator_resident": "allocator_resident_bytes",
"allocator_frag_ratio": "allocator_frag_ratio",
"allocator_frag_bytes": "allocator_frag_bytes",
"allocator_rss_ratio": "allocator_rss_ratio",
"allocator_rss_bytes": "allocator_rss_bytes",
"used_memory": "memory_used_bytes",
"used_memory_rss": "memory_used_rss_bytes",
"used_memory_peak": "memory_used_peak_bytes",
"used_memory_lua": "memory_used_lua_bytes",
"used_memory_overhead": "memory_used_overhead_bytes",
"used_memory_startup": "memory_used_startup_bytes",
"used_memory_dataset": "memory_used_dataset_bytes",
"used_memory_scripts": "memory_used_scripts_bytes",
"maxmemory": "memory_max_bytes",
"mem_fragmentation_ratio": "mem_fragmentation_ratio",
"mem_fragmentation_bytes": "mem_fragmentation_bytes",
"mem_clients_slaves": "mem_clients_slaves",
"mem_clients_normal": "mem_clients_normal",
// https://github.com/antirez/redis/blob/17bf0b25c1171486e3a1b089f3181fff2bc0d4f0/src/evict.c#L349-L352
// ... the sum of AOF and slaves buffer ....
"mem_not_counted_for_evict": "mem_not_counted_for_eviction_bytes",
"lazyfree_pending_objects": "lazyfree_pending_objects",
"active_defrag_running": "active_defrag_running",
"migrate_cached_sockets": "migrate_cached_sockets_total",
"active_defrag_hits": "defrag_hits",
"active_defrag_misses": "defrag_misses",
"active_defrag_key_hits": "defrag_key_hits",
"active_defrag_key_misses": "defrag_key_misses",
// https://github.com/antirez/redis/blob/0af467d18f9d12b137af3b709c0af579c29d8414/src/expire.c#L297-L299
"expired_time_cap_reached_count": "expired_time_cap_reached_total",
// # Persistence
"loading": "loading_dump_file",
"rdb_changes_since_last_save": "rdb_changes_since_last_save",
"rdb_bgsave_in_progress": "rdb_bgsave_in_progress",
"rdb_last_save_time": "rdb_last_save_timestamp_seconds",
"rdb_last_bgsave_status": "rdb_last_bgsave_status",
"rdb_last_bgsave_time_sec": "rdb_last_bgsave_duration_sec",
"rdb_current_bgsave_time_sec": "rdb_current_bgsave_duration_sec",
"rdb_last_cow_size": "rdb_last_cow_size_bytes",
"aof_enabled": "aof_enabled",
"aof_rewrite_in_progress": "aof_rewrite_in_progress",
"aof_rewrite_scheduled": "aof_rewrite_scheduled",
"aof_last_rewrite_time_sec": "aof_last_rewrite_duration_sec",
"aof_current_rewrite_time_sec": "aof_current_rewrite_duration_sec",
"aof_last_cow_size": "aof_last_cow_size_bytes",
"aof_current_size": "aof_current_size_bytes",
"aof_base_size": "aof_base_size_bytes",
"aof_pending_rewrite": "aof_pending_rewrite",
"aof_buffer_length": "aof_buffer_length",
"aof_rewrite_buffer_length": "aof_rewrite_buffer_length",
"aof_pending_bio_fsync": "aof_pending_bio_fsync",
"aof_delayed_fsync": "aof_delayed_fsync",
"aof_last_bgrewrite_status": "aof_last_bgrewrite_status",
"aof_last_write_status": "aof_last_write_status",
"module_fork_in_progress": "module_fork_in_progress",
"module_fork_last_cow_size": "module_fork_last_cow_size",
// # Stats
"pubsub_channels": "pubsub_channels",
"pubsub_patterns": "pubsub_patterns",
"latest_fork_usec": "latest_fork_usec",
// # Replication
"connected_slaves": "connected_slaves",
"repl_backlog_size": "replication_backlog_bytes",
"repl_backlog_active": "repl_backlog_is_active",
"repl_backlog_first_byte_offset": "repl_backlog_first_byte_offset",
"repl_backlog_histlen": "repl_backlog_history_bytes",
"master_repl_offset": "master_repl_offset",
"second_repl_offset": "second_repl_offset",
"slave_expires_tracked_keys": "slave_expires_tracked_keys",
"slave_priority": "slave_priority",
"sync_full": "replica_resyncs_full",
"sync_partial_ok": "replica_partial_resync_accepted",
"sync_partial_err": "replica_partial_resync_denied",
// # Cluster
"cluster_stats_messages_sent": "cluster_messages_sent_total",
"cluster_stats_messages_received": "cluster_messages_received_total",
// # Tile38
// based on https://tile38.com/commands/server/
"tile38_aof_size": "tile38_aof_size_bytes",
"tile38_avg_item_size": "tile38_avg_item_size_bytes",
"tile38_cpus": "tile38_cpus_total",
"tile38_heap_released": "tile38_heap_released_bytes",
"tile38_heap_size": "tile38_heap_size_bytes",
"tile38_http_transport": "tile38_http_transport",
"tile38_in_memory_size": "tile38_in_memory_size_bytes",
"tile38_max_heap_size": "tile38_max_heap_size_bytes",
"tile38_mem_alloc": "tile38_mem_alloc_bytes",
"tile38_num_collections": "tile38_num_collections_total",
"tile38_num_hooks": "tile38_num_hooks_total",
"tile38_num_objects": "tile38_num_objects_total",
"tile38_num_points": "tile38_num_points_total",
"tile38_pointer_size": "tile38_pointer_size_bytes",
"tile38_read_only": "tile38_read_only",
"tile38_threads": "tile38_threads_total",
// addtl. KeyDB metrics
"server_threads": "server_threads_total",
"long_lock_waits": "long_lock_waits_total",
"current_client_thread": "current_client_thread",
},
metricMapCounters: map[string]string{
"total_connections_received": "connections_received_total",
"total_commands_processed": "commands_processed_total",
"rejected_connections": "rejected_connections_total",
"total_net_input_bytes": "net_input_bytes_total",
"total_net_output_bytes": "net_output_bytes_total",
"expired_keys": "expired_keys_total",
"evicted_keys": "evicted_keys_total",
"keyspace_hits": "keyspace_hits_total",
"keyspace_misses": "keyspace_misses_total",
"used_cpu_sys": "cpu_sys_seconds_total",
"used_cpu_user": "cpu_user_seconds_total",
"used_cpu_sys_children": "cpu_sys_children_seconds_total",
"used_cpu_user_children": "cpu_user_children_seconds_total",
},
}
if e.options.ConfigCommandName == "" {
e.options.ConfigCommandName = "CONFIG"
}
if keys, err := parseKeyArg(opts.CheckKeys); err != nil {
return nil, fmt.Errorf("couldn't parse check-keys: %#v", err)
} else {
log.Debugf("keys: %#v", keys)
}
if singleKeys, err := parseKeyArg(opts.CheckSingleKeys); err != nil {
return nil, fmt.Errorf("couldn't parse check-single-keys: %#v", err)
} else {
log.Debugf("singleKeys: %#v", singleKeys)
}
if opts.InclSystemMetrics {
e.metricMapGauges["total_system_memory"] = "total_system_memory_bytes"
}
e.metricDescriptions = map[string]*prometheus.Desc{}
for k, desc := range map[string]struct {
txt string
lbls []string
}{
"commands_duration_seconds_total": {txt: `Total amount of time in seconds spent per command`, lbls: []string{"cmd"}},
"commands_total": {txt: `Total number of calls per command`, lbls: []string{"cmd"}},
"connected_slave_lag_seconds": {txt: "Lag of connected slave", lbls: []string{"slave_ip", "slave_port", "slave_state"}},
"connected_slave_offset_bytes": {txt: "Offset of connected slave", lbls: []string{"slave_ip", "slave_port", "slave_state"}},
"db_avg_ttl_seconds": {txt: "Avg TTL in seconds", lbls: []string{"db"}},
"db_keys": {txt: "Total number of keys by DB", lbls: []string{"db"}},
"db_keys_expiring": {txt: "Total number of expiring keys by DB", lbls: []string{"db"}},
"exporter_last_scrape_error": {txt: "The last scrape error status.", lbls: []string{"err"}},
"instance_info": {txt: "Information about the Redis instance", lbls: []string{"role", "redis_version", "redis_build_id", "redis_mode", "os"}},
"key_size": {txt: `The length or size of "key"`, lbls: []string{"db", "key"}},
"key_value": {txt: `The value of "key"`, lbls: []string{"db", "key"}},
"last_slow_execution_duration_seconds": {txt: `The amount of time needed for last slow execution, in seconds`},
"latency_spike_last": {txt: `When the latency spike last occurred`, lbls: []string{"event_name"}},
"latency_spike_duration_seconds": {txt: `Length of the last latency spike in seconds`, lbls: []string{"event_name"}},
"master_link_up": {txt: "Master link status on Redis slave", lbls: []string{"master_host", "master_port"}},
"master_sync_in_progress": {txt: "Master sync in progress", lbls: []string{"master_host", "master_port"}},
"master_last_io_seconds_ago": {txt: "Master last io seconds ago", lbls: []string{"master_host", "master_port"}},
"slave_repl_offset": {txt: "Slave replication offset", lbls: []string{"master_host", "master_port"}},
"script_values": {txt: "Values returned by the collect script", lbls: []string{"key"}},
"slave_info": {txt: "Information about the Redis slave", lbls: []string{"master_host", "master_port", "read_only"}},
"slowlog_last_id": {txt: `Last id of slowlog`},
"slowlog_length": {txt: `Total slowlog`},
"start_time_seconds": {txt: "Start time of the Redis instance since unix epoch in seconds."},
"up": {txt: "Information about the Redis instance"},
"connected_clients_details": {txt: "Details about connected clients", lbls: []string{"host", "port", "name", "age", "idle", "flags", "db", "cmd"}},
// 阿里云专有指标
"command_call_qps": {txt: "QPS per command", lbls: []string{"cmd"}},
"command_call_rt": {txt: "The mean response time per command", lbls: []string{"cmd"}},
"command_call_max_rt": {txt: "The max response time per command", lbls: []string{"cmd"}},
"command_call_request_len": {txt: "The mean request len per command", lbls: []string{"cmd"}},
"command_call_response_len": {txt: "The mean response len spent per command", lbls: []string{"cmd"}},
} {
e.metricDescriptions[k] = newMetricDescr(opts.Namespace, k, desc.txt, desc.lbls)
}
if e.options.MetricsPath == "" {
e.options.MetricsPath = "/metrics"
}
e.mux = http.NewServeMux()
if e.options.Registry != nil {
e.options.Registry.MustRegister(e)
e.mux.Handle(e.options.MetricsPath, promhttp.HandlerFor(
e.options.Registry, promhttp.HandlerOpts{ErrorHandling: promhttp.ContinueOnError},
))
if !e.options.RedisMetricsOnly {
buildInfo := prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: opts.Namespace,
Name: "exporter_build_info",
Help: "redis exporter build_info",
}, []string{"version", "commit_sha", "build_date", "golang_version"})
buildInfo.WithLabelValues(BuildVersion, BuildCommitSha, BuildDate, runtime.Version()).Set(1)
e.options.Registry.MustRegister(buildInfo)
}
}
e.mux.HandleFunc("/scrape", e.scrapeHandler)
e.mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`ok`))
})
e.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Redis Exporter ` + BuildVersion + `</title></head>
<body>
<h1>Redis Exporter ` + BuildVersion + `</h1>
<p><a href='` + opts.MetricsPath + `'>Metrics</a></p>
</body>
</html>
`))
})
return e, nil
}
func (e *Exporter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
e.mux.ServeHTTP(w, r)
}
// Describe outputs Redis metric descriptions.
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
for _, desc := range e.metricDescriptions {
ch <- desc
}
for _, v := range e.metricMapGauges {
ch <- newMetricDescr(e.options.Namespace, v, v+" metric", nil)
}
for _, v := range e.metricMapCounters {
ch <- newMetricDescr(e.options.Namespace, v, v+" metric", nil)
}
ch <- e.totalScrapes.Desc()
ch <- e.scrapeDuration.Desc()
ch <- e.targetScrapeRequestErrors.Desc()
}
// Collect fetches new metrics from the RedisHost and updates the appropriate metrics.
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
e.Lock()
defer e.Unlock()
e.totalScrapes.Inc()
if e.redisAddr != "" {
startTime := time.Now()
var up float64 = 1
if err := e.scrapeRedisHost(ch); err != nil {
up = 0
e.registerConstMetricGauge(ch, "exporter_last_scrape_error", 1.0, fmt.Sprintf("%s", err))
} else {
e.registerConstMetricGauge(ch, "exporter_last_scrape_error", 0, "")
}
e.registerConstMetricGauge(ch, "up", up)
took := time.Since(startTime).Seconds()
e.scrapeDuration.Observe(took)
e.registerConstMetricGauge(ch, "exporter_last_scrape_duration_seconds", took)
}
ch <- e.totalScrapes
ch <- e.scrapeDuration
ch <- e.targetScrapeRequestErrors
}
func (e *Exporter) includeMetric(s string) bool {
if strings.HasPrefix(s, "db") || strings.HasPrefix(s, "cmdstat_") || strings.HasPrefix(s, "cluster_") {
return true
}
if _, ok := e.metricMapGauges[s]; ok {
return true
}
_, ok := e.metricMapCounters[s]
return ok
}
var (
metricNameRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
)
func sanitizeMetricName(n string) string {
return metricNameRE.ReplaceAllString(n, "_")
}
func extractVal(s string) (val float64, err error) {
split := strings.Split(s, "=")
if len(split) != 2 {
return 0, fmt.Errorf("nope")
}
val, err = strconv.ParseFloat(split[1], 64)
if err != nil {
return 0, fmt.Errorf("nope")
}
return
}
/*
Valid Examples
id=11 addr=127.0.0.1:63508 fd=8 name= age=6321 idle=6320 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=setex
id=14 addr=127.0.0.1:64958 fd=9 name= age=5 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=26 qbuf-free=32742 obl=0 oll=0 omem=0 events=r cmd=client
*/
func parseClientListString(clientInfo string) (host string, port string, name string, age string, idle string, flags string, db string, cmd string, ok bool) {
ok = false
if matched, _ := regexp.MatchString(`^id=\d+ addr=\d+`, clientInfo); !matched {
return
}
connectedClient := map[string]string{}
for _, kvPart := range strings.Split(clientInfo, " ") {
vPart := strings.Split(kvPart, "=")
if len(vPart) != 2 {
log.Debugf("Invalid format for client list string, got: %s", kvPart)
return
}
connectedClient[vPart[0]] = vPart[1]
}
hostPortString := strings.Split(connectedClient["addr"], ":")
if len(hostPortString) != 2 {
return
}
host = hostPortString[0]
port = hostPortString[1]
name = connectedClient["name"]
age = connectedClient["age"]
idle = connectedClient["idle"]
flags = connectedClient["flags"]
db = connectedClient["db"]
cmd = connectedClient["cmd"]
ok = true
return
}
/*
valid example: db0:keys=1,expires=0,avg_ttl=0
*/
func parseDBKeyspaceString(inputKey string, inputVal string) (keysTotal float64, keysExpiringTotal float64, avgTTL float64, ok bool) {
log.Debugf("parseDBKeyspaceString inputKey: [%s] inputVal: [%s]", inputKey, inputVal)
if !strings.HasPrefix(inputKey, "db") {
log.Debugf("parseDBKeyspaceString inputKey not starting with 'db': [%s]", inputKey)
return
}
split := strings.Split(inputVal, ",")
if len(split) != 3 && len(split) != 2 {
log.Debugf("parseDBKeyspaceString strings.Split(inputVal) invalid: %#v", split)
return
}
var err error
if keysTotal, err = extractVal(split[0]); err != nil {
log.Debugf("parseDBKeyspaceString extractVal(split[0]) invalid, err: %s", err)
return
}
if keysExpiringTotal, err = extractVal(split[1]); err != nil {
log.Debugf("parseDBKeyspaceString extractVal(split[1]) invalid, err: %s", err)
return
}
avgTTL = -1
if len(split) > 2 {
if avgTTL, err = extractVal(split[2]); err != nil {
log.Debugf("parseDBKeyspaceString extractVal(split[2]) invalid, err: %s", err)
return
}
avgTTL /= 1000
}
ok = true
return
}
/*
slave0:ip=10.254.11.1,port=6379,state=online,offset=1751844676,lag=0
slave1:ip=10.254.11.2,port=6379,state=online,offset=1751844222,lag=0
*/
func parseConnectedSlaveString(slaveName string, slaveInfo string) (offset float64, ip string, port string, state string, lag float64, ok bool) {
ok = false
if matched, _ := regexp.MatchString(`^slave\d+`, slaveName); !matched {
return
}
connectedSlaveInfo := make(map[string]string)
for _, kvPart := range strings.Split(slaveInfo, ",") {
x := strings.Split(kvPart, "=")
if len(x) != 2 {
log.Debugf("Invalid format for connected slave string, got: %s", kvPart)
return
}
connectedSlaveInfo[x[0]] = x[1]
}
offset, err := strconv.ParseFloat(connectedSlaveInfo["offset"], 64)
if err != nil {
log.Debugf("Can not parse connected slave offset, got: %s", connectedSlaveInfo["offset"])
return
}
if lagStr, exists := connectedSlaveInfo["lag"]; !exists {
// Prior to Redis 3.0, "lag" property does not exist
lag = -1
} else {
lag, err = strconv.ParseFloat(lagStr, 64)
if err != nil {
log.Debugf("Can not parse connected slave lag, got: %s", lagStr)
return
}
}
ok = true
ip = connectedSlaveInfo["ip"]
port = connectedSlaveInfo["port"]
state = connectedSlaveInfo["state"]
return
}
func (e *Exporter) extractConfigMetrics(ch chan<- prometheus.Metric, config []string) (dbCount int, err error) {
if len(config)%2 != 0 {
return 0, fmt.Errorf("invalid config: %#v", config)
}
for pos := 0; pos < len(config)/2; pos++ {
strKey := config[pos*2]
strVal := config[pos*2+1]
if strKey == "databases" {
if dbCount, err = strconv.Atoi(strVal); err != nil {
return 0, fmt.Errorf("invalid config value for key databases: %#v", strVal)
}
}
// todo: we can add more configs to this map if there's interest
if !map[string]bool{
"maxmemory": true,
"maxclients": true,
}[strKey] {
continue
}
if val, err := strconv.ParseFloat(strVal, 64); err == nil {
e.registerConstMetricGauge(ch, fmt.Sprintf("config_%s", strKey), val)
}
}
return
}
func (e *Exporter) registerConstMetricGauge(ch chan<- prometheus.Metric, metric string, val float64, labels ...string) {
e.registerConstMetric(ch, metric, val, prometheus.GaugeValue, labels...)
}
func (e *Exporter) registerConstMetric(ch chan<- prometheus.Metric, metric string, val float64, valType prometheus.ValueType, labelValues ...string) {
descr := e.metricDescriptions[metric]
if descr == nil {
descr = newMetricDescr(e.options.Namespace, metric, metric+" metric", labelValues)
}
if m, err := prometheus.NewConstMetric(descr, valType, val, labelValues...); err == nil {
ch <- m
} else {
log.Debugf("NewConstMetric() err: %s", err)
}
}
func (e *Exporter) handleMetricsCommandStats(ch chan<- prometheus.Metric, fieldKey string, fieldValue string) {
/*
Format:
redis5.0
cmdstat_zadd:calls=371406522,usec=3988588044,usec_per_call=10.74,rt=9,max_rt=46,request_len=70,response_len=4,receives=371406522,qps=11
redis4.0
cmdstat_mget:calls=237469050772,usec=1465514552453,usec_per_call=6.17,rt=6,max_rt=106,request_len=94,response_len=1039,receives=237557541702,qps=8370
redis7.0
cmdstat_adminauth:calls=471103,usec=2845909,usec_per_call=6.04,rt=6,max_rt=10,request_len=24,response_len=5,receives=471103,qps=0,rejected_calls=0,failed_calls=0
*/
splitKey := strings.Split(fieldKey, "_")
if len(splitKey) != 2 {
return
}
splitValue := strings.Split(fieldValue, ",")
if len(splitValue) < 3 {
return
}
var calls float64
var usecTotal float64
var qps float64
var rt float64
var maxRt float64
var requestLen float64
var responseLen float64
var err error
if calls, err = extractVal(splitValue[0]); err != nil {
return
}
if usecTotal, err = extractVal(splitValue[1]); err != nil {
return
}
if len(splitValue) > 8 {
if qps, err = extractVal(splitValue[8]); err != nil {
return
}
if rt, err = extractVal(splitValue[3]); err != nil {
return
}
if maxRt, err = extractVal(splitValue[4]); err != nil {
return
}
if requestLen, err = extractVal(splitValue[5]); err != nil {
return
}
if responseLen, err = extractVal(splitValue[6]); err != nil {
return
}
}
cmd := splitKey[1]
e.registerConstMetric(ch, "commands_total", calls, prometheus.CounterValue, cmd)
e.registerConstMetric(ch, "commands_duration_seconds_total", usecTotal/1e6, prometheus.CounterValue, cmd)
if len(splitValue) > 7 {
e.registerConstMetric(ch, "command_call_qps", qps, prometheus.CounterValue, cmd)
e.registerConstMetric(ch, "command_call_rt", rt/1e6, prometheus.CounterValue, cmd)
e.registerConstMetric(ch, "command_call_max_rt", maxRt/1e6, prometheus.CounterValue, cmd)
e.registerConstMetric(ch, "command_call_request_len", requestLen, prometheus.CounterValue, cmd)
e.registerConstMetric(ch, "command_call_response_len", responseLen, prometheus.CounterValue, cmd)
}
}
func (e *Exporter) handleMetricsReplication(ch chan<- prometheus.Metric, masterHost string, masterPort string, fieldKey string, fieldValue string) bool {
// only slaves have this field
if fieldKey == "master_link_status" {
if fieldValue == "up" {
e.registerConstMetricGauge(ch, "master_link_up", 1, masterHost, masterPort)
} else {
e.registerConstMetricGauge(ch, "master_link_up", 0, masterHost, masterPort)
}
return true
}
switch fieldKey {
case "master_last_io_seconds_ago", "slave_repl_offset", "master_sync_in_progress":
val, _ := strconv.Atoi(fieldValue)
e.registerConstMetricGauge(ch, fieldKey, float64(val), masterHost, masterPort)
return true
}
// not a slave, try extracting master metrics
if slaveOffset, slaveIP, slavePort, slaveState, slaveLag, ok := parseConnectedSlaveString(fieldKey, fieldValue); ok {
e.registerConstMetricGauge(ch,
"connected_slave_offset_bytes",
slaveOffset,
slaveIP, slavePort, slaveState,
)
if slaveLag > -1 {
e.registerConstMetricGauge(ch,
"connected_slave_lag_seconds",
slaveLag,
slaveIP, slavePort, slaveState,
)
}
return true
}
return false
}
func (e *Exporter) handleMetricsServer(ch chan<- prometheus.Metric, fieldKey string, fieldValue string) {
if fieldKey == "uptime_in_seconds" {
if uptime, err := strconv.ParseFloat(fieldValue, 64); err == nil {
e.registerConstMetricGauge(ch, "start_time_seconds", float64(time.Now().Unix())-uptime)
}
}
}
func (e *Exporter) extractInfoMetrics(ch chan<- prometheus.Metric, info string, dbCount int) {
instanceInfo := map[string]string{}
slaveInfo := map[string]string{}
handledDBs := map[string]bool{}
fieldClass := ""
lines := strings.Split(info, "\n")
masterHost := ""
masterPort := ""
for _, line := range lines {
line = strings.TrimSpace(line)
log.Debugf("info: %s", line)
if len(line) > 0 && strings.HasPrefix(line, "# ") {
fieldClass = line[2:]
log.Debugf("set fieldClass: %s", fieldClass)
continue
}
if (len(line) < 2) || (!strings.Contains(line, ":")) {
continue
}
split := strings.SplitN(line, ":", 2)
fieldKey := split[0]
fieldValue := split[1]
var (
instanceInfoFields = map[string]bool{"role": true, "redis_version": true, "redis_build_id": true, "redis_mode": true, "os": true}
slaveInfoFields = map[string]bool{"master_host": true, "master_port": true, "slave_read_only": true}
)
if fieldKey == "master_host" {
masterHost = fieldValue
}
if fieldKey == "master_port" {
masterPort = fieldValue
}
if _, ok := instanceInfoFields[fieldKey]; ok {
instanceInfo[fieldKey] = fieldValue
continue
}
if _, ok := slaveInfoFields[fieldKey]; ok {
slaveInfo[fieldKey] = fieldValue
continue
}
switch fieldClass {
case "Replication":
if ok := e.handleMetricsReplication(ch, masterHost, masterPort, fieldKey, fieldValue); ok {
continue
}
case "Server":
e.handleMetricsServer(ch, fieldKey, fieldValue)
case "Commandstats":
e.handleMetricsCommandStats(ch, fieldKey, fieldValue)
continue
case "Keyspace":
if keysTotal, keysEx, avgTTL, ok := parseDBKeyspaceString(fieldKey, fieldValue); ok {
dbName := fieldKey
e.registerConstMetricGauge(ch, "db_keys", keysTotal, dbName)
e.registerConstMetricGauge(ch, "db_keys_expiring", keysEx, dbName)
if avgTTL > -1 {
e.registerConstMetricGauge(ch, "db_avg_ttl_seconds", avgTTL, dbName)
}
handledDBs[dbName] = true
continue
}
}
if !e.includeMetric(fieldKey) {
continue
}
e.parseAndRegisterConstMetric(ch, fieldKey, fieldValue)
}
for dbIndex := 0; dbIndex < dbCount; dbIndex++ {
dbName := "db" + strconv.Itoa(dbIndex)
if _, exists := handledDBs[dbName]; !exists {
e.registerConstMetricGauge(ch, "db_keys", 0, dbName)
e.registerConstMetricGauge(ch, "db_keys_expiring", 0, dbName)
}
}
e.registerConstMetricGauge(ch, "instance_info", 1,
instanceInfo["role"],
instanceInfo["redis_version"],
instanceInfo["redis_build_id"],
instanceInfo["redis_mode"],
instanceInfo["os"])
if instanceInfo["role"] == "slave" {
e.registerConstMetricGauge(ch, "slave_info", 1,
slaveInfo["master_host"],
slaveInfo["master_port"],
slaveInfo["slave_read_only"])
}
}
func (e *Exporter) extractClusterInfoMetrics(ch chan<- prometheus.Metric, info string) {
lines := strings.Split(info, "\r\n")
for _, line := range lines {
log.Debugf("info: %s", line)
split := strings.Split(line, ":")
if len(split) != 2 {
continue
}
fieldKey := split[0]
fieldValue := split[1]
if !e.includeMetric(fieldKey) {
continue
}
e.parseAndRegisterConstMetric(ch, fieldKey, fieldValue)
}
}
func (e *Exporter) extractCheckKeyMetrics(ch chan<- prometheus.Metric, c redis.Conn) {
keys, err := parseKeyArg(e.options.CheckKeys)
if err != nil {
log.Errorf("Couldn't parse check-keys: %#v", err)
return
}
log.Debugf("keys: %#v", keys)
singleKeys, err := parseKeyArg(e.options.CheckSingleKeys)
if err != nil {
log.Errorf("Couldn't parse check-single-keys: %#v", err)
return
}
log.Debugf("e.singleKeys: %#v", singleKeys)
allKeys := append([]dbKeyPair{}, singleKeys...)
log.Debugf("e.keys: %#v", keys)
scannedKeys, err := getKeysFromPatterns(c, keys)
if err != nil {
log.Errorf("Error expanding key patterns: %#v", err)
} else {
allKeys = append(allKeys, scannedKeys...)
}
log.Debugf("allKeys: %#v", allKeys)
for _, k := range allKeys {
if _, err := doRedisCmd(c, "SELECT", k.db); err != nil {
log.Debugf("Couldn't select database %#v when getting key info.", k.db)
continue
}
info, err := getKeyInfo(c, k.key)
if err != nil {
switch err {
case errNotFound:
log.Debugf("Key '%s' not found when trying to get type and size.", k.key)
default:
log.Error(err)
}
continue
}
dbLabel := "db" + k.db
e.registerConstMetricGauge(ch, "key_size", info.size, dbLabel, k.key)
// Only record value metric if value is float-y
if val, err := redis.Float64(doRedisCmd(c, "GET", k.key)); err == nil {
e.registerConstMetricGauge(ch, "key_value", val, dbLabel, k.key)
}
}
}
func (e *Exporter) extractLuaScriptMetrics(ch chan<- prometheus.Metric, c redis.Conn) error {
log.Debug("Evaluating e.options.LuaScript")
kv, err := redis.StringMap(doRedisCmd(c, "EVAL", e.options.LuaScript, 0, 0))
if err != nil {
log.Errorf("LuaScript error: %v", err)
return err
}
if len(kv) == 0 {
return nil
}
for key, stringVal := range kv {
if val, err := strconv.ParseFloat(stringVal, 64); err == nil {
e.registerConstMetricGauge(ch, "script_values", val, key)
}