telegraf/plugins/redis/redis.go

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package redis
import (
"bufio"
"errors"
"fmt"
"net"
"strconv"
"strings"
"sync"
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"github.com/influxdb/tivan/plugins"
)
type Redis struct {
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Disabled bool
Address string
Servers []string
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c net.Conn
buf []byte
}
var Tracking = map[string]string{
"uptime_in_seconds": "redis_uptime",
"connected_clients": "redis_clients",
"used_memory": "redis_used_memory",
"used_memory_rss": "redis_used_memory_rss",
"used_memory_peak": "redis_used_memory_peak",
"used_memory_lua": "redis_used_memory_lua",
"rdb_changes_since_last_save": "redis_rdb_changes_since_last_save",
"total_connections_received": "redis_total_connections_received",
"total_commands_processed": "redis_total_commands_processed",
"instantaneous_ops_per_sec": "redis_instantaneous_ops_per_sec",
"sync_full": "redis_sync_full",
"sync_partial_ok": "redis_sync_partial_ok",
"sync_partial_err": "redis_sync_partial_err",
"expired_keys": "redis_expired_keys",
"evicted_keys": "redis_evicted_keys",
"keyspace_hits": "redis_keyspace_hits",
"keyspace_misses": "redis_keyspace_misses",
"pubsub_channels": "redis_pubsub_channels",
"pubsub_patterns": "redis_pubsub_patterns",
"latest_fork_usec": "redis_latest_fork_usec",
"connected_slaves": "redis_connected_slaves",
"master_repl_offset": "redis_master_repl_offset",
"repl_backlog_active": "redis_repl_backlog_active",
"repl_backlog_size": "redis_repl_backlog_size",
"repl_backlog_histlen": "redis_repl_backlog_histlen",
"mem_fragmentation_ratio": "redis_mem_fragmentation_ratio",
"used_cpu_sys": "redis_used_cpu_sys",
"used_cpu_user": "redis_used_cpu_user",
"used_cpu_sys_children": "redis_used_cpu_sys_children",
"used_cpu_user_children": "redis_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 g.Disabled {
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return nil
}
var servers []string
if g.Address != "" {
servers = append(servers, g.Address)
}
servers = append(servers, g.Servers...)
if len(servers) == 0 {
g.gatherServer(":6379", acc)
return nil
}
var wg sync.WaitGroup
var outerr error
for _, serv := range servers {
wg.Add(1)
go func(serv string) {
defer wg.Done()
outerr = g.gatherServer(serv, acc)
}(serv)
}
wg.Wait()
return outerr
}
func (g *Redis) gatherServer(addr string, acc plugins.Accumulator) error {
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if g.c == nil {
c, err := net.Dial("tcp", addr)
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if err != nil {
return 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{}
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})
}