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// Copyright 2015-2025 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"fmt"
"net"
"runtime"
"strings"
"testing"
"time"
"github.com/nats-io/jwt/v2"
"github.com/nats-io/nats.go"
"github.com/nats-io/nkeys"
)
func TestMaxPayload(t *testing.T) {
srv, opts := RunServerWithConfig("./configs/override.conf")
defer srv.Shutdown()
endpoint := fmt.Sprintf("%s:%d", opts.Host, opts.Port)
nc, err := nats.Connect(fmt.Sprintf("nats://%s/", endpoint))
if err != nil {
t.Fatalf("Could not connect to server: %v", err)
}
defer nc.Close()
size := 4 * 1024 * 1024
big := sizedBytes(size)
err = nc.Publish("foo", big)
if err != nats.ErrMaxPayload {
t.Fatalf("Expected a Max Payload error")
}
conn, err := net.DialTimeout("tcp", endpoint, nc.Opts.Timeout)
if err != nil {
t.Fatalf("Could not make a raw connection to the server: %v", err)
}
defer conn.Close()
info := make([]byte, 512)
_, err = conn.Read(info)
if err != nil {
t.Fatalf("Expected an info message to be sent by the server: %s", err)
}
pub := fmt.Sprintf("PUB bar %d\r\n", size)
_, err = conn.Write([]byte(pub))
if err != nil {
t.Fatalf("Could not publish event to the server: %s", err)
}
errMsg := make([]byte, 35)
_, err = conn.Read(errMsg)
if err != nil {
t.Fatalf("Expected an error message to be sent by the server: %s", err)
}
if !strings.Contains(string(errMsg), "Maximum Payload Violation") {
t.Errorf("Received wrong error message (%v)\n", string(errMsg))
}
// Client proactively omits sending the message so server
// does not close the connection.
if nc.IsClosed() {
t.Errorf("Expected connection to not be closed.")
}
// On the other hand client which did not proactively omitted
// publishing the bytes following what is suggested by server
// in the info message has its connection closed.
_, err = conn.Write(big)
if err == nil && runtime.GOOS != "windows" {
t.Errorf("Expected error due to maximum payload transgression.")
}
// On windows, the previous write will not fail because the connection
// is not fully closed at this stage.
if runtime.GOOS == "windows" {
// Issuing a PING and not expecting the PONG.
_, err = conn.Write([]byte("PING\r\n"))
if err == nil {
conn.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
_, err = conn.Read(big)
if err == nil {
t.Errorf("Expected closed connection due to maximum payload transgression.")
}
}
}
}
func TestMaxPayloadOverrun(t *testing.T) {
opts := DefaultTestOptions
opts.Port = -1
opts.MaxPayload = 10000
s := RunServer(&opts)
defer s.Shutdown()
// Overrun a int32
c := createClientConn(t, "127.0.0.1", opts.Port)
defer c.Close()
send, expect := setupConn(t, c)
send("PUB foo 199380988\r\n")
expect(errRe)
// Now overrun an int64, parseSize will have returned -1,
// so we get disconnected.
c = createClientConn(t, "127.0.0.1", opts.Port)
defer c.Close()
send, _ = setupConn(t, c)
send("PUB foo 18446744073709551615123\r\n")
expectDisconnect(t, c)
}
func TestAsyncInfoWithSmallerMaxPayload(t *testing.T) {
s, opts := runOperatorServer(t)
defer s.Shutdown()
const testMaxPayload = 522
okp, _ := nkeys.FromSeed(oSeed)
akp, _ := nkeys.CreateAccount()
apub, _ := akp.PublicKey()
nac := jwt.NewAccountClaims(apub)
nac.Limits.Payload = testMaxPayload
ajwt, err := nac.Encode(okp)
if err != nil {
t.Fatalf("Error generating account JWT: %v", err)
}
if err := s.AccountResolver().Store(apub, ajwt); err != nil {
t.Fatalf("Account Resolver returned an error: %v", err)
}
url := fmt.Sprintf("nats://%s:%d", opts.Host, opts.Port)
nc, err := nats.Connect(url, createUserCreds(t, s, akp))
if err != nil {
t.Fatalf("Error on connect: %v", err)
}
nc.Flush()
defer nc.Close()
if mp := nc.MaxPayload(); mp != testMaxPayload {
t.Fatalf("Expected MaxPayload of %d, got %d", testMaxPayload, mp)
}
}
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