graham/towerops-agent
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replace fmt.Sprintf with strconv in hot paths

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Use strconv.FormatInt/FormatUint instead of fmt.Sprintf for integer
conversions in snmpValueToString. Use encoding/hex + strings.Builder
instead of fmt.Sprintf loop in formatHex. Use strconv.FormatUint for
WebSocket ref counter. Reduces allocations per OID significantly.
This commit is contained in:
Graham McIntire 2026-02-12 09:47:42 -06:00
parent 82df96cd59
commit 07e7ed2745
No known key found for this signature in database
2 changed files with 18 additions and 17 deletions
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4
agent.go
View file

@ -8,6 +8,7 @@ import (
"log/slog"
"os"
"runtime"
"strconv"
"strings"
"sync"
"sync/atomic"
@ -89,8 +90,7 @@ func runSession(ctx context.Context, baseURL, token string) error {
refCounter.Store(1)
nextRef := func() string {
r := refCounter.Add(1)
return fmt.Sprintf("%d", r)
return strconv.FormatUint(refCounter.Add(1), 10)
}
sendMsg := func(event string, payload json.RawMessage) {

31
snmp.go
View file

@ -1,8 +1,11 @@
package main
import (
"encoding/hex"
"fmt"
"log/slog"
"strconv"
"strings"
"time"
"unicode/utf8"
@ -254,13 +257,12 @@ func mapPrivProtocol(p string) gosnmp.SnmpV3PrivProtocol {
func snmpValueToString(pdu gosnmp.SnmpPDU) string {
switch pdu.Type {
case gosnmp.Integer:
return fmt.Sprintf("%d", gosnmp.ToBigInt(pdu.Value).Int64())
return strconv.FormatInt(gosnmp.ToBigInt(pdu.Value).Int64(), 10)
case gosnmp.OctetString:
b := pdu.Value.([]byte)
if !utf8.Valid(b) {
return formatHex(b)
}
// Check for non-printable control chars
for _, c := range b {
if c < 0x20 && c != '\n' && c != '\r' && c != '\t' {
return formatHex(b)
@ -270,13 +272,13 @@ func snmpValueToString(pdu gosnmp.SnmpPDU) string {
case gosnmp.ObjectIdentifier:
return pdu.Value.(string)
case gosnmp.Counter32:
return fmt.Sprintf("%d", pdu.Value.(uint))
return strconv.FormatUint(uint64(pdu.Value.(uint)), 10)
case gosnmp.Counter64:
return fmt.Sprintf("%d", pdu.Value.(uint64))
return strconv.FormatUint(pdu.Value.(uint64), 10)
case gosnmp.Gauge32:
return fmt.Sprintf("%d", pdu.Value.(uint))
return strconv.FormatUint(uint64(pdu.Value.(uint)), 10)
case gosnmp.TimeTicks:
return fmt.Sprintf("%d", pdu.Value.(uint32))
return strconv.FormatUint(uint64(pdu.Value.(uint32)), 10)
case gosnmp.IPAddress:
return pdu.Value.(string)
case gosnmp.Null, gosnmp.NoSuchObject, gosnmp.NoSuchInstance, gosnmp.EndOfMibView:
@ -292,16 +294,15 @@ func formatHex(b []byte) string {
if len(b) == 0 {
return ""
}
parts := make([]string, len(b))
for i, v := range b {
parts[i] = fmt.Sprintf("%02x", v)
}
result := ""
for i, p := range parts {
h := hex.EncodeToString(b)
var buf strings.Builder
buf.Grow(len(h) + len(b) - 1)
for i := 0; i < len(h); i += 2 {
if i > 0 {
result += ":"
buf.WriteByte(':')
}
result += p
buf.WriteByte(h[i])
buf.WriteByte(h[i+1])
}
return result
return buf.String()
}