protected void sendRequest(
HttpRequest request,
SendRequestResultListener listener,
HttpResponseProcessor responseProcessor) {
if (isClosingOrClosed()) {
listener.onSendRequestFailure(request, new ClosedChannelException());
} else if (!isConnected()) {
listener.onSendRequestFailure(request, new RuntimeException("unable to send request"));
} else {
try {
setResponseProcessor(responseProcessor, listener);
} catch (DatabusException e) {
listener.onSendRequestFailure(request, e.getCause());
_channel.close();
return;
}
// Send the HTTP request.
if (_channel.isConnected()) {
// ChannelFuture future = _channel.write(request);
// future.addListener(new MySendRequestListener(request, listener));
_channel.write(request);
} else {
_log.error("disconnect on request: " + request.getUri());
listener.onSendRequestFailure(request, new ClosedChannelException());
}
}
}
@Override
public DatabusRequest process(DatabusRequest request)
throws IOException, RequestProcessingException {
String command = request.getParams().getProperty(DatabusRequest.PATH_PARAM_NAME);
if (null == command) {
throw new InvalidRequestParamValueException(COMMAND_NAME, "command", "null");
}
String reply = "Command " + command + " completed ";
LOG.info("got relayCommand = " + command);
if (command.equals(SAVE_META_STATE_PARAM)) {
_relay.saveBufferMetaInfo(true);
} else if (command.equals(SHUTDOWN_RELAY_PARAM)) {
String msg =
"received shutdown curl request from: "
+ request.getRemoteAddress()
+ ". Shutting down\n";
LOG.warn(msg);
request.getResponseContent().write(ByteBuffer.wrap(msg.getBytes("UTF-8")));
request.getResponseContent().close();
_relay.shutdown();
} else if (command.equals(VALIDATE_RELAY_BUFFER_PARAM)) {
_relay.validateRelayBuffers();
} else if (command.equals(DISCONNECT_CLIENTS)) {
Channel rspChannel = request.getResponseContent().getRawChannel();
_relay.disconnectDBusClients(rspChannel);
} else if (command.equals(RUN_GC_PARAM)) {
Runtime rt = Runtime.getRuntime();
long mem = rt.freeMemory();
LOG.info("mem before gc = " + rt.freeMemory() + " out of " + rt.totalMemory());
long time = System.currentTimeMillis();
System.gc();
time = System.currentTimeMillis() - time;
mem = rt.freeMemory() - mem;
reply =
new String(
"GC run. Took "
+ time
+ " millsecs. Freed "
+ mem
+ " bytes out of "
+ rt.totalMemory());
} else if (command.startsWith(RESET_RELAY_BUFFER_PARAM)) {
// We expect the request to be of the format:
// resetRelayBuffer/<dbName>/<partitionId>?prevScn=<long>&binlogOffset=<long>
String[] resetCommands = command.split("/");
if (resetCommands.length != 3) {
throw new InvalidRequestParamValueException(COMMAND_NAME, "command", command);
}
String dbName = resetCommands[1];
String dbPart = resetCommands[2];
long prevScn = request.getRequiredLongParam(PREV_SCN_PARAM);
long binlogOffset = request.getOptionalLongParam(BINLOG_OFFSET_PARAM, 0L);
LOG.info("reset command = " + dbName + " part =" + dbPart);
try {
_relay.resetBuffer(
new PhysicalPartition(Integer.parseInt(dbPart), dbName), prevScn, binlogOffset);
} catch (BufferNotFoundException e) {
reply = new String("command " + command + ":" + e.getMessage());
}
} else if (command.startsWith(GET_BINLOG_OFFSET_PARAM)) {
String[] getOfsArgs = command.split("/");
if (getOfsArgs.length != 2) {
throw new InvalidRequestParamValueException(GET_BINLOG_OFFSET_PARAM, "Server ID", "");
}
int serverId;
try {
serverId = Integer.parseInt(getOfsArgs[1]);
int[] offset = _relay.getBinlogOffset(serverId);
if (offset.length != 2) {
reply = "Error getting binlog offset";
} else {
reply = new String("RelayLastEvent(" + offset[0] + "," + offset[1] + ")");
}
} catch (NumberFormatException e) {
throw new InvalidRequestParamValueException(
GET_BINLOG_OFFSET_PARAM, "Server ID", getOfsArgs[1]);
} catch (DatabusException e) {
reply = new String("command " + command + "failed with:" + e.getMessage());
}
} else if (command.startsWith(PRINT_RELAY_INFO_PARAM)) {
try {
Map<String, String> infoMap = _relay.printInfo();
reply = makeJsonResponse(infoMap, request);
} catch (Exception e) {
reply = new String("command " + command + " failed with:" + e.getMessage());
}
} else {
// invalid command
reply =
new String(
"command "
+ command
+ " is invalid. Valid commands are: "
+ SAVE_META_STATE_PARAM
+ "|"
+ SHUTDOWN_RELAY_PARAM
+ "|"
+ VALIDATE_RELAY_BUFFER_PARAM
+ "|"
+ RUN_GC_PARAM
+ "|"
+ RESET_RELAY_BUFFER_PARAM
+ "|"
+ GET_BINLOG_OFFSET_PARAM
+ "|"
+ PRINT_RELAY_INFO_PARAM
+ "|"
+ DISCONNECT_CLIENTS);
}
byte[] responseBytes = new byte[(reply.length() + 2)];
System.arraycopy(reply.getBytes("UTF-8"), 0, responseBytes, 0, reply.length());
int idx = reply.length();
responseBytes[idx] = (byte) '\r';
responseBytes[idx + 1] = (byte) '\n';
request.getResponseContent().write(ByteBuffer.wrap(responseBytes));
return request;
}