Self taught RTC -- serverlesson 4

Super Sloth 2020-11-07 23:58:42
self taught rtc serverlesson


about Last section In the example , More suitable for sending small files , If it's used directly to send large files , It's easy to run out of memory resources on the server . When large files are requested , You can limit the amount of memory used each time you send a large file ( for example 16000 B).

  1. Open the project in the previous section

  2. modify RtcDataProvider3 Of OnCheckRequest event :

var
fname: string;
begin
with TRtcDataServer(Sender) do
begin
fname := GetFullFileName(Request.FileName);
if (fname <> '') and (File_Exists(fname)) then
begin
Accept;
Request.Info['fname'] := fname;
Response.ContentLength := File_Size(fname);
WriteHeader;
end;
end;
end;
  1. modify RtcDataProvider3 Of OnDataReceived event :
var
fname: string;
len: cardinal;
begin
with TRtcDataServer(Sender) do
if Request.Complete then
begin
if Response.ContentLength > Response.ContentOut then
begin
fname := Request.Info['fname'];
if File_Size(fname) = Response.ContentLength then
begin
len := Response.ContentLength - Response.ContentOut;
if len > 16000 then
len := 16000;
Write(Read_File(fname, Response.ContentOut, len));
end
else
Disconnect;
end;
end;
end;
  1. relation RtcDataProvider3 Of OnDataSent The event to the OnDataReceived The realization of the event , Make both events point to the same piece of code

  2. Compile and run

  3. stay data Put a big file under the folder ( for example test.mp3), Visit website http://localhost/test.mp3

Process analysis

To get a better understanding of the whole process , hold RtcHttpServer1 and RtcDataProvider3 Every event in the log :

[22:36:08.272] RtcHttpServer1ListenStart->
[22:36:08.292] RtcDataProvider3ListenStart->
[22:36:26.108] RtcHttpServer1ClientConnect->
[22:36:26.118] RtcHttpServer1Connecting->
[22:36:26.130] RtcHttpServer1Connect->
[22:36:26.160] RtcHttpServer1DataIn->
[22:36:26.164] RtcDataProvider3CheckRequest-> Request file :F:\RTC\bin\data\test.ppt [12521984 B]
[22:36:26.169] RtcHttpServer1RequestAccepted->
[22:36:26.175] RtcDataProvider3DataOut->
[22:36:26.178] RtcHttpServer1DataOut->
[22:36:26.257] RtcHttpServer1PeekRequest->
[22:36:26.262] RtcDataProvider3DataReceived-> The remaining :12521984 B
[22:36:26.276] RtcDataProvider3DataOut->
[22:36:26.281] RtcHttpServer1DataOut->
[22:36:26.286] RtcDataProvider3DataSent-> The remaining :12505984 B
[22:36:26.301] RtcDataProvider3DataOut->
[22:36:26.311] RtcHttpServer1DataOut->
[22:36:26.316] RtcDataProvider3ReadyToSend->
[22:36:26.323] RtcDataProvider3DataSent-> The remaining :12489984 B
[22:36:26.338] RtcDataProvider3DataOut->
[22:36:26.345] RtcHttpServer1DataOut->
...
[22:36:50.488] RtcDataProvider3ReadyToSend->
[22:36:50.494] RtcDataProvider3DataSent-> The remaining :9984 B
[22:36:50.507] RtcDataProvider3DataOut->
[22:36:50.515] RtcHttpServer1DataOut->
[22:36:50.522] RtcDataProvider3ReadyToSend->
[22:36:50.528] RtcDataProvider3DataSent->
[22:36:50.534] RtcDataProvider3ResponseDone->
[22:36:50.540] RtcHttpServer1ResponseDone->
[22:38:45.919] RtcHttpServer1Disconnecting->
[22:38:45.950] RtcHttpServer1Disconnect->
[22:38:45.968] RtcHttpServer1ClientDisconnect->
[22:46:04.945] RtcDataProvider1ListenStop->
[22:46:04.955] RtcHttpServer1ListenStop->
  1. Server startup ,RtcHttpServer1 Start listening ,RtcDataProvider3 With the beginning of monitoring

  2. Request file in browser ,RtcHttpServer1 Received client connection ,RtcHttpServer1 Start connecting , Successful connection ,RtcHttpServer1 Receive the data ( request ),RtcDataProvider3 Also received a request

  3. RtcDataProvider3 stay OnCheckRequest Event check request , File exists , Accept the request

  4. RtcHttpServer1 Make sure the request is accepted ,RtcDataProvider3 Write the file name to the request information Request.Info['fname'] Medium standby , Write the file size to the response length Response.ContentLength in , And then send the response hair out ( It's actually sent to RtcHttpServer1, then RtcHttpServer1 Finally send out the response )

  5. RtcHttpServer1Peek request ,RtcDataProvider3 Trigger OnDataReceived event

  6. RtcDataProvider3 The complete request is received before processing , No changes were found in the document ( The size has not changed ) And the file exceeds 16000 B, Send only 16000 B( issue RtcHttpServer1,RtcHttpServer1 Forward again )

  7. RtcDataProvider3 Data sent out , Trigger OnDataSent event , It is found that the file has not been sent out in the event processing , Prepare the data to continue sending ( It's still just sending 16000 B, from RtcHttpServer1 forward ), Send and trigger again OnDataSent event ……

  8. Until all the file data is sent ,RtcDataProvider3 Complete the response ,RtcHttpServer1 Also complete the response

  9. Browser closed ,RtcHttpServer1 Start to disconnect , Connection is broken

  10. Turn off the server ,RtcDataProvider3 Stop listening ,RtcHttpServer1 And stop listening

版权声明
本文为[Super Sloth]所创,转载请带上原文链接,感谢

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