void handle_timedout_frames(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling timed out datagrams
// 1) Iterate through the sliding window protocol information you maintain for each receiver
// 2) Locate frames that are timed out and add them to the outgoing frames
// 3) Update the next timeout field on the outgoing frames
int i = 0;
struct timeval *time = malloc(sizeof(struct timeval));
gettimeofday(time, NULL);
for (;i < SWS; i++) {
if (sender->sendQ[i].inuse == 1) {
long timediff = timeval_usecdiff(time, sender->sendQ[i].timeout);
if (timediff < 0) {
Frame * outgoing_frame = (Frame *) sender->sendQ[i].msg;
char * outgoing_msg = convert_frame_to_char(outgoing_frame);
//fprintf(stderr, "%d frame timing out\n", outgoing_frame->seqNum);
append_crc(outgoing_msg,MAX_FRAME_SIZE);
ll_append_node(outgoing_frames_head_ptr, outgoing_msg);
setTimeOutTime(sender->sendQ[i].timeout);
//free(outgoing_frame);
}
}
}
}
void handle_timedout_frames(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//Iterate through the send queue
int i;
for(i=0; i < glb_receivers_array_length; i++)
{
send_Q ** curr_node = sender->send_q_head[i];
int lar = sender->LAR[i];
int lfs = sender->LFS[i];
while(lar != lfs)
{
lar = (lar + 1) % (MAX_SEQ_NUM + 1);
send_Q * curr = curr_node[lar%WS];
Frame * sent_frame = curr->frame;
struct timeval * tv = curr->frame_timeout;
struct timeval now;
gettimeofday(&now, NULL);
//A frame with set timeout is found
if(tv != NULL)
{
//Update timeout field for old, timed out frames
if(timeval_usecdiff(tv, &now) > 0)
{
fprintf(stderr, "TIMEDOUT DATA %s being resent\n", sent_frame->data);
char * outframe_char_buf = convert_frame_to_char(sent_frame);
ll_append_node(outgoing_frames_head_ptr, outframe_char_buf);
calculate_timeout(curr->frame_timeout);
}
}
//Update timeout field for fresh outgoing frames
if(tv == NULL && sent_frame != NULL)
{
fprintf(stderr, "FRESH DATA %s being sent\n", sent_frame->data);
curr->frame_timeout = (struct timeval *) malloc(sizeof(struct timeval));
calculate_timeout(curr->frame_timeout);
}
}
}
}
void handle_input_cmds(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
int input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Split the message if it's too long
ll_split_head(&sender->input_cmdlist_head, FRAME_PAYLOAD_SIZE - 1);
//Recheck the command queue length to see if stdin_thread dumped a command on us
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
while (input_cmd_length > 0)
{
//Pop a node off and update the input_cmd_length
LLnode * ll_input_cmd_node = ll_pop_node(&sender->input_cmdlist_head);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Cast to Cmd type and free up the memory for the node
Cmd * outgoing_cmd = (Cmd *) ll_input_cmd_node->value;
free(ll_input_cmd_node);
//Convert uint16_t to string
char* src = malloc(MAC_ADDR_SIZE);
char* dst = malloc(MAC_ADDR_SIZE);
sprintf(src, "%u", outgoing_cmd->src_id);
sprintf(dst, "%u", outgoing_cmd->dst_id);
int id = atoi(dst);
if(send_q_size(sender, id) < WS)
{
Frame * outgoing_frame = (Frame *) malloc (sizeof(Frame));
//Populate the outgoing frame's fields
strncpy(outgoing_frame->receiver_addr, dst, MAC_ADDR_SIZE);
strncpy(outgoing_frame->sender_addr, src, MAC_ADDR_SIZE);
strncpy(outgoing_frame->data, outgoing_cmd->message, FRAME_PAYLOAD_SIZE);
//Assign seqnum to the outgoing frame
outgoing_frame->seqnum = sender->seqnum[id];
char* raw_char_buf = convert_frame_to_char(outgoing_frame);
//Assign crc to the outgoing frame
outgoing_frame->crc = crc8(raw_char_buf, MAX_FRAME_SIZE);
free(raw_char_buf);
//At this point, we don't need the outgoing_cmd
free(outgoing_cmd->message);
free(outgoing_cmd);
//Update LFS
sender->LFS[id] = sender->seqnum[id];
//Convert the message to the outgoing_charbuf and send it
char * outgoing_charbuf = convert_frame_to_char(outgoing_frame);
//fprintf(stderr, "MESSAGE %s SENT\n", outgoing_frame->data);
ll_append_node(outgoing_frames_head_ptr, outgoing_charbuf);
sender->send_q_head[id][sender->seqnum[id] % WS]->frame = malloc(sizeof(Frame));
//Store the sent frame in the sent queue
memcpy(sender->send_q_head[id][sender->seqnum[id] % WS]->frame, outgoing_frame, sizeof(Frame));
sender->send_q_head[id][sender->seqnum[id] % WS]->frame_timeout = NULL;
free(outgoing_frame);
sender->seqnum[id] = (sender->seqnum[id] == 255) ? 0 : sender->seqnum[id] + 1;
}
else
{
ll_append_node_at_front(&sender->input_cmdlist_head, outgoing_cmd);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
break;
}
}
}
void handle_input_cmds(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling input cmd
// 1) Dequeue the Cmd from sender->input_cmdlist_head
// 2) Convert to Frame
// 3) Set up the frame according to the sliding window protocol
// 4) Compute CRC and add CRC to Frame
int input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Recheck the command queue length to see if stdin_thread dumped a command on us
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
ll_split_head(&sender->input_cmdlist_head, FRAME_PAYLOAD_SIZE - 1);
while (input_cmd_length > 0 && sender->sendQSize <= SWS)
{
// fprintf(stderr, "%d %d\n", input_cmd_length, ll_get_length(sender->input_cmdlist_head));
unsigned char upper = sender->LAR + SWS - 1;
//printf("%d %d %d ", sender->LAR, upper, sender->seqNum);
if (!((sender->LAR <= upper &&
sender->seqNum >= sender->LAR &&
sender->seqNum <= upper) ||
(sender->LAR > upper &&
(sender->seqNum >= sender->LAR ||
sender->seqNum <= upper))))
break;
//Pop a node off and update the input_cmd_length
LLnode * ll_input_cmd_node = ll_pop_node(&sender->input_cmdlist_head);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Cast to Cmd type and free up the memory for the node
Cmd * outgoing_cmd = (Cmd *) ll_input_cmd_node->value;
free(ll_input_cmd_node);
//DUMMY CODE: Add the raw char buf to the outgoing_frames list
//NOTE: You should not blindly send this message out!
// Ask yourself: Is this message actually going to the right receiver (recall that default behavior of send is to broadcast to all receivers)?
// Does the receiver have enough space in in it's input queue to handle this message?
// Were the previous messages sent to this receiver ACTUALLY delivered to the receiver?
int msg_length = strlen(outgoing_cmd->message);
if (msg_length > MAX_FRAME_SIZE)
{
//Do something about messages that exceed the frame size
printf("<SEND_%d>: sending messages of length greater than %d is not implemented\n", sender->send_id, MAX_FRAME_SIZE);
}
else
{
//This is probably ONLY one step you want
Frame * outgoing_frame = (Frame *) malloc (sizeof(Frame));
strcpy(outgoing_frame->data, outgoing_cmd->message);
outgoing_frame->src_id = outgoing_cmd->src_id;
outgoing_frame->dst_id = outgoing_cmd->dst_id;
outgoing_frame->seqNum = sender->seqNum;
sender->seqNum++;
//if (sender->seqNum >= SWS)
// sender->seqNum = 0;
//if (sender->seqNum == 5)
// sender->seqNum++;
//At this point, we don't need the outgoing_cmd
free(outgoing_cmd->message);
free(outgoing_cmd);
//Convert the message to the outgoing_charbuf
char * outgoing_charbuf = convert_frame_to_char(outgoing_frame);
append_crc(outgoing_charbuf, MAX_FRAME_SIZE);
//fprintf(stderr, "Sending %d with data %s\n", outgoing_frame->seqNum,outgoing_frame->data);
ll_append_node(outgoing_frames_head_ptr,
outgoing_charbuf);
int i = 0;
for (; i < SWS; i++) {
if (sender->sendQ[i].inuse == 0) {
sender->sendQSize++;
struct timeval * timeout = malloc(sizeof(struct timeval));
setTimeOutTime(timeout);
sender->sendQ[i].inuse = 1;
sender->sendQ[i].timeout = timeout;
sender->sendQ[i].msg =(Frame *)malloc(MAX_FRAME_SIZE);
memcpy(sender->sendQ[i].msg,outgoing_frame,MAX_FRAME_SIZE);
break;
}
}
free(outgoing_frame);
}
}
}
void handle_input_cmds(Sender * sender,
LLnode ** outgoing_frames_head_ptr)
{
//TODO: Suggested steps for handling input cmd
// 1) Dequeue the Cmd from sender->input_cmdlist_head
// 2) Convert to Frame
// 3) Set up the frame according to the sliding window protocol
// 4) Compute CRC and add CRC to Frame
int input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Recheck the command queue length to see if stdin_thread dumped a command on us
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
while (input_cmd_length > 0)
{
//Pop a node off and update the input_cmd_length
LLnode * ll_input_cmd_node = ll_pop_node(&sender->input_cmdlist_head);
input_cmd_length = ll_get_length(sender->input_cmdlist_head);
//Cast to Cmd type and free up the memory for the node
Cmd * outgoing_cmd = (Cmd *) ll_input_cmd_node->value;
free(ll_input_cmd_node);
//DUMMY CODE: Add the raw char buf to the outgoing_frames list
//NOTE: You should not blindly send this message out!
// Ask yourself: Is this message actually going to the right receiver (recall that default behavior of send is to broadcast to all receivers)?
// Does the receiver have enough space in in it's input queue to handle this message?
// Were the previous messages sent to this receiver ACTUALLY delivered to the receiver?
int msg_length = strlen(outgoing_cmd->message);
if (msg_length > 0)
{
//init id
sender->recv_id = outgoing_cmd->dst_id;
//init sender
sender->LFS = -1;
sender->LAR = -1;
sender->SWS = 8;
sender->FSS = (msg_length + TEMP_SIZE - 1) / TEMP_SIZE;
//sender->FSS = (msg_length + TEMP_SIZE) / TEMP_SIZE;
sender->fin = 0;// not fin
free(sender->message);
sender->message = malloc(msg_length + 1);
strcpy(sender->message, outgoing_cmd->message);
sender->message_length = msg_length;
//init buffer;
sender->buffer = (struct Frame**) malloc(8 * sizeof(Frame*));
sender->timestamp = malloc(8 * sizeof(struct timeval));
int i;
struct timeval init_time;
gettimeofday(&init_time, NULL);
init_time.tv_sec += 999999;
for (i = 0; i < 8; i++)
{
sender->buffer[i] = malloc(1);
sender->timestamp[i] = init_time;
}
//print_sender(sender);
}
else
{
//This is probably ONLY one step you want
Frame * outgoing_frame = (Frame *) malloc (sizeof(Frame));
strcpy(outgoing_frame->data, outgoing_cmd->message);
//At this point, we don't need the outgoing_cmd
free(outgoing_cmd->message);
free(outgoing_cmd);
//Convert the message to the outgoing_charbuf
char * outgoing_charbuf = convert_frame_to_char(outgoing_frame);
//char * outgoing_charbuf = add_chksum(outgoing_frame);
ll_append_node(outgoing_frames_head_ptr,
outgoing_charbuf);
free(outgoing_frame);
}
}
}
