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refactor: refine random payload gen for large payload size #152

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refactor: refine random payload gen for large payload size #152

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54 changes: 49 additions & 5 deletions mqtt_jmeter/src/main/java/net/xmeter/Util.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
import java.io.InputStream;
import java.security.KeyStore;
import java.security.SecureRandom;
import java.util.Random;
import java.util.UUID;
import java.util.logging.Logger;

Expand All @@ -18,9 +19,23 @@

public class Util implements Constants {

private static SecureRandom random = new SecureRandom();
private static Random random = new Random();
private static char[] seeds = "abcdefghijklmnopqrstuvwxmy0123456789".toCharArray();
private static final Logger logger = Logger.getLogger(Util.class.getCanonicalName());

private static String[] longChunks = new String[16];
private static final int PAYLOAD_CHUNK_SIZE = 4096;

static {
for (int i = 0; i < longChunks.length; i++) {
StringBuffer res = new StringBuffer();
for(int j = 0; j < 4096; j++) {
res.append(seeds[random.nextInt(seeds.length - 1)]);
}
longChunks[i] = res.toString();
}

}

public static String generateClientId(String prefix) {
int leng = prefix.length();
Expand All @@ -37,12 +52,12 @@ public static String generateClientId(String prefix) {

public static SSLContext getContext(AbstractMQTTSampler sampler) throws Exception {
if (!sampler.isDualSSLAuth()) {
logger.info("Configured with non-dual SSL.");
logger.fine("Configured with non-dual SSL.");
SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
sslContext.init(null, new TrustManager[] {new AcceptAllTrustManager()}, new SecureRandom());
return sslContext;
} else {
logger.info("Configured with dual SSL, trying to load client certification.");
logger.fine("Configured with dual SSL, trying to load client certification.");
// String KEYSTORE_PASS = sampler.getKeyStorePassword();
String CLIENTCERT_PASS = sampler.getClientCertPassword();

Expand Down Expand Up @@ -95,11 +110,40 @@ private static File getFilePath(String filePath) {

public static String generatePayload(int size) {
StringBuffer res = new StringBuffer();
for(int i = 0; i < size; i++) {
res.append(seeds[random.nextInt(seeds.length - 1)]);
if (size <= PAYLOAD_CHUNK_SIZE) {
for(int i = 0; i < size; i++) {
res.append(seeds[random.nextInt(seeds.length - 1)]);
}
} else {
int block = size / PAYLOAD_CHUNK_SIZE;
int remainSize = size % PAYLOAD_CHUNK_SIZE;
int[] indices = randomIndices(longChunks.length);
for(int i=0; i<block; i++) {
int ind = block % 10;
res.append(longChunks[indices[ind]]);
}
res.append(randomChunkPiece(remainSize));
}
return res.toString();
}

private static int[] randomIndices(int length) {
int[] indices = new int[10];
int val = random.nextInt(Integer.MAX_VALUE);
String str = String.format("%010d", val);
for (int i = 0; i < indices.length; i++) {
int intVal = Character.getNumericValue(str.charAt(i)) % length;
indices[i] = intVal;
}
return indices;
}

private static String randomChunkPiece(int remainSize) {
int start = random.nextInt(PAYLOAD_CHUNK_SIZE - remainSize + 1);
int end = start + remainSize;
int randomInd = random.nextInt(longChunks.length);
return longChunks[randomInd].substring(start, end);
}

public static boolean isSecureProtocol(String protocol) {
return SSL_PROTOCOL.equals(protocol) || WSS_PROTOCOL.equals(protocol);
Expand Down
14 changes: 9 additions & 5 deletions mqtt_jmeter/src/main/java/net/xmeter/samplers/PubSampler.java
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Original file line number Diff line number Diff line change
Expand Up @@ -143,8 +143,7 @@ public SampleResult sample(Entry arg0) {
System.arraycopy(timePrefix, 0, toSend, 0, timePrefix.length);
System.arraycopy(tmp, 0, toSend, timePrefix.length , tmp.length);
} else {
toSend = new byte[tmp.length];
System.arraycopy(tmp, 0, toSend, 0 , tmp.length);
toSend = tmp;
}

result.sampleStart();
Expand All @@ -155,7 +154,12 @@ public SampleResult sample(Entry arg0) {
MQTTPubResult pubResult = connection.publish(topicName, toSend, qos_enum, retainedMsg);

result.sampleEnd();
result.setSamplerData(new String(toSend));
//only keep the first 1024 characters in sampler data
if (toSend.length <= 1024) {
result.setSamplerData(new String(toSend));
} else {
result.setSamplerData(new String(toSend).substring(0, 1024) + "...");
}
result.setSentBytes(toSend.length);
result.setLatency(result.getEndTime() - result.getStartTime());
result.setSuccessful(pubResult.isSuccessful());
Expand All @@ -169,8 +173,8 @@ public SampleResult sample(Entry arg0) {
result.setResponseMessage(MessageFormat.format("Publish failed for connection {0}.", connection));
result.setResponseData(MessageFormat.format("Client [{0}] publish failed: {1}", (clientId == null ? "null" : clientId), pubResult.getError().orElse("")).getBytes());
result.setResponseCode("501");
logger.info(MessageFormat.format("** [clientId: {0}, topic: {1}, payload: {2}] Publish failed for connection {3}.", (clientId == null ? "null" : clientId),
topicName, new String(toSend), connection));
logger.info(MessageFormat.format("** [clientId: {0}, topic: {1}] Publish failed for connection {2}.", (clientId == null ? "null" : clientId),
topicName, connection));
pubResult.getError().ifPresent(logger::info);
}
} catch (Exception ex) {
Expand Down