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// Copyright 2015-2018 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/go-nats"
)
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)
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.")
}
}
}
}
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