bool DaliComm::isYes(bool aNoOrTimeout, uint8_t aResponse, ErrorPtr &aError, bool aCollisionIsYes)
{
bool isYes = !aNoOrTimeout;
if (aError && aCollisionIsYes && aError->isError(DaliCommError::domain(), DaliCommErrorDALIFrame)) {
// framing error -> consider this a YES
isYes = true;
aError.reset(); // not considered an error when aCollisionIsYes is set
}
else if (isYes && !aCollisionIsYes) {
// regular answer, must be DALIANSWER_YES to be a regular YES
if (aResponse!=DALIANSWER_YES) {
// invalid YES response
aError.reset(new DaliCommError(DaliCommErrorInvalidAnswer));
}
}
if (aError)
return false; // real error, consider NO
// return YES/NO
return isYes;
}
ErrorPtr SocketComm::connectNextAddress()
{
int res;
ErrorPtr err;
const int one = 1;
// close possibly not fully open connection FD
internalCloseConnection();
// try to create a socket
int socketFD = -1;
// as long as we have more addresses to check and not already connecting
bool startedConnecting = false;
while (currentAddressInfo && !startedConnecting) {
err.reset();
socketFD = socket(currentAddressInfo->ai_family, currentAddressInfo->ai_socktype, currentAddressInfo->ai_protocol);
if (socketFD==-1) {
err = SysError::errNo("Cannot create client socket: ");
}
else {
// usable address found, socket created
// - make socket non-blocking
makeNonBlocking(socketFD);
// Now we have a socket
if (connectionLess) {
// UDP: no connect phase
// - enable for broadcast if requested
if (broadcast) {
// needs SO_BROADCAST
if (setsockopt(socketFD, SOL_SOCKET, SO_BROADCAST, (char *)&one, (int)sizeof(one)) == -1) {
err = SysError::errNo("Cannot setsockopt(SO_BROADCAST): ");
}
else {
// to receive answers, we also need to bind to INADDR_ANY
// - get port number
char sbuf[NI_MAXSERV];
int s = getnameinfo(
currentAddressInfo->ai_addr, currentAddressInfo->ai_addrlen,
NULL, 0, // no host address
sbuf, sizeof sbuf, // only service/port
NI_NUMERICSERV
);
if (s==0) {
// convert to numeric port number
int port;
if (sscanf(sbuf, "%d", &port)==1) {
// bind connectionless socket to INADDR_ANY to receive broadcasts at all
struct sockaddr_in recvaddr;
memset(&recvaddr, 0, sizeof recvaddr);
recvaddr.sin_family = AF_INET;
recvaddr.sin_port = htons(port);
recvaddr.sin_addr.s_addr = INADDR_ANY;
if (::bind(socketFD, (struct sockaddr*)&recvaddr, sizeof recvaddr) == -1) {
err = SysError::errNo("Cannot bind to INADDR_ANY: ");
}
}
}
}
}
if (Error::isOK(err)) {
startedConnecting = true;
// save valid address info for later use (UDP needs it to send datagrams)
if (currentSockAddrP)
free(currentSockAddrP);
currentSockAddrLen = currentAddressInfo->ai_addrlen;
currentSockAddrP = (sockaddr *)malloc(currentSockAddrLen);
memcpy(currentSockAddrP, currentAddressInfo->ai_addr, currentAddressInfo->ai_addrlen);
}
}
else {
// TCP: initiate connection
res = connect(socketFD, currentAddressInfo->ai_addr, currentAddressInfo->ai_addrlen);
LOG(LOG_DEBUG, "- Attempting connection with address family = %d, protocol = %d", currentAddressInfo->ai_family, currentAddressInfo->ai_protocol);
if (res==0 || errno==EINPROGRESS) {
// connection initiated (or already open, but connectionMonitorHandler will take care in both cases)
startedConnecting = true;
}
else {
// immediate error connecting
err = SysError::errNo("Cannot connect: ");
}
}
}
// advance to next address
currentAddressInfo = currentAddressInfo->ai_next;
}
if (!startedConnecting) {
// exhausted addresses without starting to connect
if (!err) err = ErrorPtr(new SocketCommError(SocketCommErrorNoConnection, "No connection could be established"));
LOG(LOG_DEBUG, "Cannot initiate connection to %s:%s - %s", hostNameOrAddress.c_str(), serviceOrPortOrSocket.c_str(), err->description().c_str());
}
else {
if (!connectionLess) {
// connection in progress
isConnecting = true;
// - save FD
connectionFd = socketFD;
// - install callback for when FD becomes writable (or errors out)
mainLoop.registerPollHandler(
connectionFd,
POLLOUT,
boost::bind(&SocketComm::connectionMonitorHandler, this, _1, _2, _3)
);
}
else {
// UDP socket successfully created
LOG(LOG_DEBUG, "Connectionless socket ready for address family = %d, protocol = %d", protocolFamily, protocol);
connectionOpen = true;
isConnecting = false;
currentAddressInfo = NULL; // no more addresses to check
// immediately use socket for I/O
setFd(socketFD);
// call handler if defined
if (connectionStatusHandler) {
// connection ok
connectionStatusHandler(this, ErrorPtr());
}
}
}
// clean up if list processed
freeAddressInfo();
// return status
return err;
}
ErrorPtr PropertyContainer::accessProperty(PropertyAccessMode aMode, ApiValuePtr aQueryObject, ApiValuePtr aResultObject, int aDomain, PropertyDescriptorPtr aParentDescriptor)
{
ErrorPtr err;
#if DEBUGFOCUSLOGGING
FOCUSLOG("\naccessProperty: entered with query = %s\n", aQueryObject->description().c_str());
if (aParentDescriptor) {
FOCUSLOG("- parentDescriptor '%s' (%s), fieldKey=%u, objectKey=%u\n", aParentDescriptor->name(), aParentDescriptor->isStructured() ? "structured" : "scalar", aParentDescriptor->fieldKey(), aParentDescriptor->objectKey());
}
#endif
// for reading, NULL query is like query { "":NULL }
if (aQueryObject->isNull() && aMode==access_read) {
aQueryObject->setType(apivalue_object);
aQueryObject->add("", aQueryObject->newValue(apivalue_null));
}
// aApiObject must be of type apivalue_object
if (!aQueryObject->isType(apivalue_object))
return ErrorPtr(new VdcApiError(415, "Query or Value written must be object"));
if (aMode==access_read) {
if (!aResultObject)
return ErrorPtr(new VdcApiError(415, "accessing property for read must provide result object"));
aResultObject->setType(apivalue_object); // must be object
}
// Iterate trough elements of query object
aQueryObject->resetKeyIteration();
string queryName;
ApiValuePtr queryValue;
string errorMsg;
while (aQueryObject->nextKeyValue(queryName, queryValue)) {
FOCUSLOG("- starting to process query element named '%s' : %s\n", queryName.c_str(), queryValue->description().c_str());
if (aMode==access_read && queryName=="#") {
// asking for number of elements at this level -> generate and return int value
queryValue = queryValue->newValue(apivalue_int64); // integer
queryValue->setInt32Value(numProps(aDomain, aParentDescriptor));
aResultObject->add(queryName, queryValue);
}
else {
// accessing an element or series of elements at this level
bool wildcard = isMatchAll(queryName);
// - find all descriptor(s) for this queryName
PropertyDescriptorPtr propDesc;
int propIndex = 0;
bool foundone = false;
do {
propDesc = getDescriptorByName(queryName, propIndex, aDomain, aParentDescriptor);
if (propDesc) {
foundone = true; // found at least one descriptor for this query element
FOCUSLOG(" - processing descriptor '%s' (%s), fieldKey=%u, objectKey=%u\n", propDesc->name(), propDesc->isStructured() ? "structured" : "scalar", propDesc->fieldKey(), propDesc->objectKey());
// actually access by descriptor
if (propDesc->isStructured()) {
ApiValuePtr subQuery;
// property is a container. Now check the value
if (queryValue->isType(apivalue_object)) {
subQuery = queryValue; // query specifies next level, just use it
}
else if (queryName!="*" && (!wildcard || propDesc->isWildcardAddressable())) {
// don't recurse deeper when query name is "*" or property is not wildcard-adressable
// special case is "*" as leaf in query - only recurse if it is not present
// - autocreate subquery
subQuery = queryValue->newValue(apivalue_object);
subQuery->add("", queryValue->newValue(apivalue_null));
}
if (subQuery) {
// addressed property is a container by itself -> recurse
// - get the PropertyContainer
int containerDomain = aDomain; // default to same, but getContainer may modify it
PropertyDescriptorPtr containerPropDesc = propDesc;
PropertyContainerPtr container = getContainer(containerPropDesc, containerDomain);
if (container) {
FOCUSLOG(" - container for '%s' is 0x%p\n", propDesc->name(), container.get());
FOCUSLOG(" >>>> RECURSING into accessProperty()\n");
if (aMode==access_read) {
// read needs a result object
ApiValuePtr resultValue = queryValue->newValue(apivalue_object);
err = container->accessProperty(aMode, subQuery, resultValue, containerDomain, containerPropDesc);
if (Error::isOK(err)) {
// add to result with actual name (from descriptor)
FOCUSLOG("\n <<<< RETURNED from accessProperty() recursion\n");
FOCUSLOG(" - accessProperty of container for '%s' returns %s\n", propDesc->name(), resultValue->description().c_str());
aResultObject->add(propDesc->name(), resultValue);
}
}
else {
// for write, just pass the query value
err = container->accessProperty(aMode, subQuery, ApiValuePtr(), containerDomain, containerPropDesc);
FOCUSLOG(" <<<< RETURNED from accessProperty() recursion\n", propDesc->name(), container.get());
}
if ((aMode!=access_read) && Error::isOK(err)) {
// give this container a chance to post-process write access
err = writtenProperty(aMode, propDesc, aDomain, container);
}
// 404 errors are collected, but dont abort the query
if (Error::isError(err, VdcApiError::domain(), 404)) {
if (!errorMsg.empty()) errorMsg += "; ";
errorMsg += string_format("Error(s) accessing subproperties of '%s' : { %s }", queryName.c_str(), err->description().c_str());
err.reset(); // forget the error on this level
}
}
}
}
else {
// addressed (and known by descriptor!) property is a simple value field -> access it
if (aMode==access_read) {
// read access: create a new apiValue and have it filled
ApiValuePtr fieldValue = queryValue->newValue(propDesc->type()); // create a value of correct type to get filled
bool accessOk = accessField(aMode, fieldValue, propDesc); // read
// for read, not getting an OK from accessField means: property does not exist (even if known per descriptor),
// so it will not be added to the result
if (accessOk) {
// add to result with actual name (from descriptor)
aResultObject->add(propDesc->name(), fieldValue);
}
FOCUSLOG(" - accessField for '%s' returns %s\n", propDesc->name(), fieldValue->description().c_str());
}
else {
// write access: just pass the value
if (!accessField(aMode, queryValue, propDesc)) { // write
err = ErrorPtr(new VdcApiError(403,string_format("Write access to '%s' denied", propDesc->name())));
}
}
}
}
else {
// no descriptor found for this query element
// Note: this means that property is not KNOWN, which IS not the same as getting false from accessField
// (latter means that property IS known, but has no value in the context it was queried)
// HOWEVER, for the vdc API it was decided that for reading, these cases should NOT be
// distinguished for getProperty. If a property does not exist for either reason, the return tree just does
// no contain that property.
// Also note that not having a property is not the same as not having a property VALUE:
// latter case will explicitly return a NULL value
if (!wildcard && !foundone && aMode!=access_read) {
// query did address a specific property but it is unknown -> report as error (for read AND write!)
// - collect error message, but do not abort query processing
if (!errorMsg.empty()) errorMsg += "; ";
errorMsg += string_format("Unknown property '%s' -> ignored", queryName.c_str());
}
}
} while (Error::isOK(err) && propIndex!=PROPINDEX_NONE);
}
// now generate error if we have collected a non-empty error message
if (!errorMsg.empty()) {
err = ErrorPtr(new VdcApiError(404,errorMsg));
}
#if DEBUGLOGGING
if (aMode==access_read) {
FOCUSLOG("- query element named '%s' now has result object: %s\n", queryName.c_str(), aResultObject->description().c_str());
}
#endif
}
return err;
}
void JsonRpcComm::gotJson(ErrorPtr aError, JsonObjectPtr aJsonObject)
{
JsonRpcCommPtr keepMeAlive(this); // make sure this object lives until routine terminates
ErrorPtr respErr;
bool safeError = false; // set when reporting error is safe (i.e. not error possibly generated by malformed error, to prevent error loops)
JsonObjectPtr idObj;
const char *idString = NULL;
if (Error::isOK(aError)) {
// received proper JSON, now check JSON-RPC specifics
FOCUSLOG("Received JSON message:\n %s\n", aJsonObject->c_strValue());
if (aJsonObject->isType(json_type_array)) {
respErr = ErrorPtr(new JsonRpcError(JSONRPC_INVALID_REQUEST, "Invalid Request - batch mode not supported by this implementation"));
}
else if (!aJsonObject->isType(json_type_object)) {
respErr = ErrorPtr(new JsonRpcError(JSONRPC_INVALID_REQUEST, "Invalid Request - request must be JSON object"));
}
else {
// check request object fields
const char *method = NULL;
JsonObjectPtr o = aJsonObject->get("jsonrpc");
if (!o)
respErr = ErrorPtr(new JsonRpcError(JSONRPC_INVALID_REQUEST, "Invalid Request - missing 'jsonrpc'"));
else if (o->stringValue()!="2.0")
respErr = ErrorPtr(new JsonRpcError(JSONRPC_INVALID_REQUEST, "Invalid Request - wrong version in 'jsonrpc'"));
else {
// get ID param (must be present for all messages except notification)
idObj = aJsonObject->get("id");
if (idObj) idString = idObj->c_strValue();
JsonObjectPtr paramsObj = aJsonObject->get("params");
// JSON-RPC version is correct, check other params
method = aJsonObject->getCString("method");
if (method) {
// this is a request (responses don't have the method member)
safeError = idObj!=NULL; // reporting error is safe if this is a method call. Other errors are reported only when reportAllErrors is set
if (*method==0)
respErr = ErrorPtr(new JsonRpcError(JSONRPC_INVALID_REQUEST, "Invalid Request - empty 'method'"));
else {
// looks like a valid method or notification call
if (!jsonRequestHandler) {
// no handler -> method cannot be executed
respErr = ErrorPtr(new JsonRpcError(JSONRPC_METHOD_NOT_FOUND, "Method not found"));
}
else {
if (paramsObj && !paramsObj->isType(json_type_array) && !paramsObj->isType(json_type_object)) {
// invalid param object
respErr = ErrorPtr(new JsonRpcError(JSONRPC_INVALID_REQUEST, "Invalid Request - 'params' must be object or array"));
}
else {
// call handler to execute method or notification
jsonRequestHandler(method, idString, paramsObj);
}
}
}
}
else {
// this is a response (requests always have a method member)
// - check if result or error
JsonObjectPtr respObj;
if (!aJsonObject->get("result", respObj)) {
// must be error, need further decoding
respObj = aJsonObject->get("error");
if (!respObj)
respErr = ErrorPtr(new JsonRpcError(JSONRPC_INTERNAL_ERROR, "Internal JSON-RPC error - response with neither 'result' nor 'error'"));
else {
// dissect error object
ErrorCode errCode = JSONRPC_INTERNAL_ERROR; // Internal RPC error
const char *errMsg = "malformed Error response";
// - try to get error code
JsonObjectPtr o = respObj->get("code");
if (o) errCode = o->int32Value();
// - try to get error message
o = respObj->get("message");
if (o) errMsg = o->c_strValue();
// compose error object from this
respErr = ErrorPtr(new JsonRpcError(errCode, errMsg));
// also get optional data element
respObj = respObj->get("data");
}
}
// Now we have either result or error.data in respObj, and respErr is Ok or contains the error code + message
if (!idObj) {
// errors without ID cannot be associated with calls made earlier, so just log the error
LOG(LOG_WARNING,"JSON-RPC 2.0 warning: Received response with no or NULL 'id' that cannot be dispatched:\n %s\n", aJsonObject->c_strValue());
}
else {
// dispatch by ID
uint32_t requestId = idObj->int32Value();
PendingAnswerMap::iterator pos = pendingAnswers.find(requestId);
if (pos==pendingAnswers.end()) {
// errors without ID cannot be associated with calls made earlier, so just log the error
LOG(LOG_WARNING,"JSON-RPC 2.0 error: Received response with unknown 'id'=%d : %s\n", requestId, aJsonObject->c_strValue());
}
else {
// found callback
JsonRpcResponseCB cb = pos->second;
pendingAnswers.erase(pos); // erase
cb(requestId, respErr, respObj); // call
}
respErr.reset(); // handled
}
}
}
}
}
else {
// no proper JSON received, create error response
if (aError->isDomain(JsonError::domain())) {
// some kind of parsing error
respErr = ErrorPtr(new JsonRpcError(JSONRPC_PARSE_ERROR, aError->description()));
}
else {
// some other type of server error
respErr = ErrorPtr(new JsonRpcError(JSONRPC_SERVER_ERROR, aError->description()));
}
}
// auto-generate error response for internally created errors
if (!Error::isOK(respErr)) {
if (safeError || reportAllErrors)
sendError(idString, respErr);
else
LOG(LOG_WARNING,"Received data that generated error which can't be sent back: Code=%d, Message='%s'\n", respErr->getErrorCode(), respErr->description().c_str());
}
}
