telegraf/plugins/redis/redis.go

184 lines
4.1 KiB
Go

package redis
import (
"bufio"
"errors"
"fmt"
"net"
"strconv"
"strings"
"sync"
"github.com/influxdb/telegraf/plugins"
)
type Redis struct {
Servers []string
c net.Conn
buf []byte
}
var sampleConfig = `
# An array of address to gather stats about. Specify an ip on hostname
# with optional port. ie localhost, 10.10.3.33:18832, etc.
#
# If no servers are specified, then localhost is used as the host.
servers = ["localhost"]`
func (r *Redis) SampleConfig() string {
return sampleConfig
}
func (r *Redis) Description() string {
return "Read metrics from one or many redis servers"
}
var Tracking = map[string]string{
"uptime_in_seconds": "uptime",
"connected_clients": "clients",
"used_memory": "used_memory",
"used_memory_rss": "used_memory_rss",
"used_memory_peak": "used_memory_peak",
"used_memory_lua": "used_memory_lua",
"rdb_changes_since_last_save": "rdb_changes_since_last_save",
"total_connections_received": "total_connections_received",
"total_commands_processed": "total_commands_processed",
"instantaneous_ops_per_sec": "instantaneous_ops_per_sec",
"sync_full": "sync_full",
"sync_partial_ok": "sync_partial_ok",
"sync_partial_err": "sync_partial_err",
"expired_keys": "expired_keys",
"evicted_keys": "evicted_keys",
"keyspace_hits": "keyspace_hits",
"keyspace_misses": "keyspace_misses",
"pubsub_channels": "pubsub_channels",
"pubsub_patterns": "pubsub_patterns",
"latest_fork_usec": "latest_fork_usec",
"connected_slaves": "connected_slaves",
"master_repl_offset": "master_repl_offset",
"repl_backlog_active": "repl_backlog_active",
"repl_backlog_size": "repl_backlog_size",
"repl_backlog_histlen": "repl_backlog_histlen",
"mem_fragmentation_ratio": "mem_fragmentation_ratio",
"used_cpu_sys": "used_cpu_sys",
"used_cpu_user": "used_cpu_user",
"used_cpu_sys_children": "used_cpu_sys_children",
"used_cpu_user_children": "used_cpu_user_children",
}
var ErrProtocolError = errors.New("redis protocol error")
// Reads stats from all configured servers accumulates stats.
// Returns one of the errors encountered while gather stats (if any).
func (g *Redis) Gather(acc plugins.Accumulator) error {
if len(g.Servers) == 0 {
g.gatherServer(":6379", acc)
return nil
}
var wg sync.WaitGroup
var outerr error
for _, serv := range g.Servers {
wg.Add(1)
go func(serv string) {
defer wg.Done()
outerr = g.gatherServer(serv, acc)
}(serv)
}
wg.Wait()
return outerr
}
const defaultPort = "6379"
func (g *Redis) gatherServer(addr string, acc plugins.Accumulator) error {
if g.c == nil {
_, _, err := net.SplitHostPort(addr)
if err != nil {
addr = addr + ":" + defaultPort
}
c, err := net.Dial("tcp", addr)
if err != nil {
return fmt.Errorf("Unable to connect to redis server '%s': %s", addr, err)
}
g.c = c
}
g.c.Write([]byte("info\n"))
r := bufio.NewReader(g.c)
line, err := r.ReadString('\n')
if err != nil {
return err
}
if line[0] != '$' {
return fmt.Errorf("bad line start: %s", ErrProtocolError)
}
line = strings.TrimSpace(line)
szStr := line[1:]
sz, err := strconv.Atoi(szStr)
if err != nil {
return fmt.Errorf("bad size string <<%s>>: %s", szStr, ErrProtocolError)
}
var read int
for read < sz {
line, err := r.ReadString('\n')
if err != nil {
return err
}
read += len(line)
if len(line) == 1 || line[0] == '#' {
continue
}
parts := strings.SplitN(line, ":", 2)
name := string(parts[0])
metric, ok := Tracking[name]
if !ok {
continue
}
val := strings.TrimSpace(parts[1])
ival, err := strconv.ParseUint(val, 10, 64)
if err == nil {
acc.Add(metric, ival, nil)
continue
}
fval, err := strconv.ParseFloat(val, 64)
if err != nil {
return err
}
acc.Add(metric, fval, nil)
}
return nil
}
func init() {
plugins.Add("redis", func() plugins.Plugin {
return &Redis{}
})
}