110 lines
3.0 KiB
Markdown
110 lines
3.0 KiB
Markdown
Lab 0 Writeup
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=============
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My name: Catfood
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My SUNet ID: 998244353
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I collaborated with: An orange cat
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This lab took me about `2` hours to do.
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My secret code from section 2.1 was: `294080`
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- Optional: I had unexpected difficulty with: [打字的手速太慢，telnet会超时]
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- Optional: I think you could make this lab better by: [describe]
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- Optional: I was surprised by: [describe]
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- Optional: I'm not sure about: [describe]
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实现细节描述
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============
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2.1.2：
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```
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➜ sponge git:(lab0-startercode) ✗ telnet cs144.keithw.org http
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Trying 104.196.238.229...
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Connected to cs144.keithw.org.
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Escape character is '^]'.
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GET /hello HTTP/1.1
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Host: cs144.keithw.org
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Connection: close
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HTTP/1.1 200 OK
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Date: Tue, 14 Feb 2023 14:17:29 GMT
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Server: Apache
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Last-Modified: Thu, 13 Dec 2018 15:45:29 GMT
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ETag: "e-57ce93446cb64"
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Accept-Ranges: bytes
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Content-Length: 14
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Connection: close
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Content-Type: text/plain
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Hello, CS144!
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Connection closed by foreign host.
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```
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2.1.3:
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```
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➜ sponge git:(lab0-startercode) ✗ telnet cs144.keithw.org http
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Trying 104.196.238.229...
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Connected to cs144.keithw.org.
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Escape character is '^]'.
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GET /lab0/998244353 HTTP/1.1
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Host: cs144.keithw.org
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Connection: close
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HTTP/1.1 200 OK
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Date: Tue, 14 Feb 2023 14:18:54 GMT
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Server: Apache
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X-You-Said-Your-SunetID-Was: 998244353
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X-Your-Code-Is: 294080
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Content-length: 113
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Vary: Accept-Encoding
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Connection: close
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Content-Type: text/plain
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Hello! You told us that your SUNet ID was "998244353". Please see the HTTP headers (above) for your secret code.
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Connection closed by foreign host.
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```
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2.2:
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学校的邮件系统比较智障，做不了
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2.3:
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```
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➜ sponge git:(lab0-startercode) ✗ telnet localhost 9090
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Trying 127.0.0.1...
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Connected to localhost.
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Escape character is '^]'.
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fuck
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lalal
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Connection closed by foreign host.
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➜ sponge git:(lab0-startercode) ✗ netcat -v -l -p 9090
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Listening on 0.0.0.0 9090
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Connection received on localhost 33706
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fuck
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lalal
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```
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3.4:
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他的提示没啥用，但是doxygen里面有个例子，可以直接看那个例子。
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地址可以直接放域名，`Address(host, protocol)`这个重载是可以DNS查询的，因此直接用就行，然后TCP socket，`connect->write->loop read`就好了。
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4:
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Buffer开了一个STL的`deque`，感觉是最适合做这种buffer的容器了，能够前后插入删除、常数级随机访问、动态调整空间，非常棒的性质。数据类型用的是`char`（byte），方便调整。
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write接口没啥东西，控制一下不要超出空间就行。
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read接口比较智障，需要这样一个组合，但是实际上好像测试的时候都没用到。。。
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```cpp
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std::string data_read = peek_output(len);
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pop_output(len);
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return data_read;
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```
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最智障的是它的`peek_output`和`pop_output`这两个的设计：peek只能读，啥也不能动，因为是个const函数；pop需要再把东西删掉，然后`read`就是他们的组合。需要注意一下，更新`bytes_read`是在pop里面而不是read，因为大概率在上层的实现中，可能需要把直接调用peek和pop而不是read。 |