bool FBSession::performRequest(FBRequest* aRequest, bool aEnqueue) {
// Stagger requests that happen in short bursts to prevent the server from rejecting
// them for making too many requests in a short time
int seconds = iLastRequestTime.secsTo( QDateTime::currentDateTime() );
bool burst = seconds && (seconds < kBurstDuration);
if (burst && (iRequestBurstCount > kMaxBurstRequests))
{
if (aEnqueue)
{
enqueueRequest(aRequest);
}
return false;
}
else
{
aRequest->connect();
if (burst) {
iRequestBurstCount++;
} else {
iRequestBurstCount = 1;
iLastRequestTime = aRequest->timeStamp();
}
}
return true;
}
void SpellChecker::requestCheckingFor(PassRefPtr<SpellCheckRequest> request)
{
if (!request || !canCheckAsynchronously(request->paragraphRange().get()))
return;
ASSERT(request->data().sequence() == unrequestedTextCheckingSequence);
int sequence = ++m_lastRequestSequence;
if (sequence == unrequestedTextCheckingSequence)
sequence = ++m_lastRequestSequence;
request->setCheckerAndSequence(this, sequence);
if (m_timerToProcessQueuedRequest.isActive() || m_processingRequest) {
enqueueRequest(request);
return;
}
invokeRequest(request);
}
uint8_t SystemControlInterface::handleVendorRequest(HAL_USB_SetupRequest* req) {
/*
* This callback should process vendor-specific SETUP requests from the host.
* NOTE: This callback is called from an ISR.
*
* Each request contains the following fields:
* - bmRequestType - request type bit mask. Since only vendor-specific device requests are forwarded
* to this callback, the only bit that should be of intereset is
* "Data Phase Transfer Direction", easily accessed as req->bmRequestTypeDirection:
* 0 - Host to Device
* 1 - Device to Host
* - bRequest - 1 byte, request identifier. The only reserved request that will not be forwarded to this callback
* is 0xee, which is used for Microsoft-specific vendor requests.
* - wIndex - 2 byte index, any value between 0x0000 and 0xffff.
* - wValue - 2 byte value, any value between 0x0000 and 0xffff.
* - wLength - each request might have an optional data stage of up to 0xffff (65535) bytes.
* Host -> Device requests contain data sent by the host to the device.
* Device -> Host requests request the device to send up to wLength bytes of data.
*
* This callback should return 0 if the request has been correctly handled or 1 otherwise.
*
* When handling Device->Host requests with data stage, this callback should fill req->data buffer with
* up to wLength bytes of data if req->data != NULL (which should be the case when wLength <= 64)
* or set req->data to point to some buffer which contains up to wLength bytes of data.
* wLength may be safely modified to notify that there is less data in the buffer than requested by the host.
*
* [1] Host -> Device requests with data stage containing up to 64 bytes can be handled by
* an internal buffer in HAL. For requests larger than 64 bytes, the vendor request callback
* needs to provide a buffer of an appropriate size:
*
* req->data = buffer; // sizeof(buffer) >= req->wLength
* return 0;
*
* The callback will be called again once the data stage completes
* It will contain the same bmRequest, bRequest, wIndex, wValue and wLength fields.
* req->data should contain wLength bytes received from the host.
*/
/*
* We are handling only bRequest = 0x50 ('P') requests.
* The request type itself (enum USBRequestType) should be in wIndex field.
*/
if (req->bRequest != 0x50)
return 1;
if (req->bmRequestTypeDirection == 0) {
// Host -> Device
switch (req->wIndex) {
case USB_REQUEST_RESET: {
// FIXME: We probably shouldn't reset from an ISR.
// The host will probably get an error that control request has timed out since we
// didn't respond to it.
System.reset(req->wValue);
break;
}
case USB_REQUEST_DFU_MODE: {
// FIXME: We probably shouldn't enter DFU mode from an ISR.
// The host will probably get an error that control request has timed out since we
// didn't respond to it.
System.dfu(false);
break;
}
case USB_REQUEST_LISTENING_MODE: {
// FIXME: We probably shouldn't enter listening mode from an ISR.
// The host will probably get an error that control request has timed out since we
// didn't respond to it.
system_set_flag(SYSTEM_FLAG_STARTUP_SAFE_LISTEN_MODE, 1, nullptr);
System.enterSafeMode();
break;
}
case USB_REQUEST_LOG_CONFIG: {
return enqueueRequest(req, DATA_FORMAT_JSON);
}
case USB_REQUEST_CUSTOM: {
return enqueueRequest(req);
}
default: {
// Unknown request
return 1;
}
}
} else {
// Device -> Host
switch (req->wIndex) {
case USB_REQUEST_DEVICE_ID: {
if (req->wLength == 0 || req->data == NULL) {
// No data stage or requested > 64 bytes
return 1;
}
if (req->wValue == 0x0001) {
// Return as buffer
if (req->wLength < 12)
return 1;
HAL_device_ID(req->data, req->wLength);
req->wLength = 12;
} else {
// Return as string
String id = System.deviceID();
if (req->wLength < (id.length() + 1))
return 1;
strncpy((char*)req->data, id.c_str(), req->wLength);
req->wLength = id.length() + 1;
}
break;
}
case USB_REQUEST_SYSTEM_VERSION: {
if (req->wLength == 0 || req->data == NULL) {
// No data stage or requested > 64 bytes
return 1;
}
strncpy((char*)req->data, __XSTRING(SYSTEM_VERSION_STRING), req->wLength);
req->wLength = sizeof(__XSTRING(SYSTEM_VERSION_STRING)) + 1;
break;
}
case USB_REQUEST_LOG_CONFIG:
case USB_REQUEST_CUSTOM: {
return fetchRequestResult(req);
}
default: {
// Unknown request
return 1;
}
}
}
return 0;
}