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<!DOCTYPE html><html><head><meta charset="utf-8"><title>Relatório tls client server.md</title><style>@charset "UTF-8";@import 'https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0-alpha2/katex.min.css';code{color:#c7254e;background-color:#f9f2f4;border-radius:4px}code,kbd{padding:2px 4px}kbd{color:#fff;background-color:#333;border-radius:3px;box-shadow:inset 0 -1px 0 rgba(0,0,0,.25)}kbd kbd{padding:0;font-size:100%;box-shadow:none}pre{display:block;margin:0 0 10px;word-break:break-all;word-wrap:break-word;color:#333;background-color:#f5f5f5;border:1px solid #ccc;border-radius:4px}pre code{padding:0;font-size:inherit;color:inherit;white-space:pre-wrap;background-color:transparent;border-radius:0}.pre-scrollable{max-height:340px;overflow-y:scroll}table{background-color:transparent}th{text-align:left}.table{width:100%;max-width:100%;margin-bottom:20px}.table>thead>tr>th{padding:8px;line-height:1.4285714;border-top:1px solid 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<h1 class="code-line" data-line-start=0 data-line-end=1><a id="Relatorio_Trabalho_Cache_em_Tabela_Hash_0"></a>Relatorio Trabalho Cache em Tabela Hash</h1>
<p class="has-line-data" data-line-start="1" data-line-end="2">Aluno: Leonardo Bueno Nogueira Kruger GRR: 20180130</p>
<p class="has-line-data" data-line-start="3" data-line-end="4">Aluno: Lucas Block Villatore GRR: 20171677</p>
<h2 class="code-line" data-line-start=5 data-line-end=6><a id="Descrio_do_trabalho_5"></a>Descrição do trabalho</h2>
<ol>
<li class="has-line-data" data-line-start="7" data-line-end="8">Você tem 3 servidores de temperatura em lugares extremos do mundo: ou normalmente muito frios ou normalmente muito quentes. Cada um destes servidores recebem uma resposta e simplemente mandam uma resposta com um número inteiro que mais se aproxima da temperatura medida.</li>
<li class="has-line-data" data-line-start="8" data-line-end="9">Um cliente não acessa os servidores individualmente, e sim uma cache que mantém os últimos valores recebidos dos 3 servidores. Assim evitamos que o cliente tenha que fazer 3 acessos muito distantes, para fazer 1 acesso mais próximo.</li>
<li class="has-line-data" data-line-start="9" data-line-end="10">A cache mantém uma tabela cache com os dados, com um prazo de validade para cada entrada de 30 segundos. Implemente o cliente. Implemente também a tabela cache da maneira eficiente que foi apresentada em sala de aula. Quando chega uma requisição e algum valor expirou, deve ser feita nova consulta ao servidor original.</li>
<li class="has-line-data" data-line-start="10" data-line-end="11">Para os 3 servidores, a dupla pode tanto implementá-los como servidores do trabalho, utilizando número aleatórios dentro de uma faixa razoável para os valores de temperatura ou, alternativamente, obter as informações adequadamente na Web.</li>
<li class="has-line-data" data-line-start="11" data-line-end="13">Devem ser apresentados logs para múltiplas execuções. Mostre com clareza situações em que uma requisição de usuário encontra/não encontra a cache com informações válidas.</li>
</ol>
<h2 class="code-line" data-line-start=13 data-line-end=14><a id="Informaes_13"></a>Informações</h2>
<p class="has-line-data" data-line-start="14" data-line-end="15">Linguagem de programação: Python</p>
<h2 class="code-line" data-line-start=15 data-line-end=16><a id="Implementao_15"></a>Implementação</h2>
<h3 class="code-line" data-line-start=16 data-line-end=17><a id="Servidores_16"></a>Servidores:</h3>
<p class="has-line-data" data-line-start="17" data-line-end="18">Conforme a descrição do trabalho, existem três servidores que:</p>
<ol>
<li class="has-line-data" data-line-start="18" data-line-end="19">Ao receber uma requisição</li>
<li class="has-line-data" data-line-start="19" data-line-end="20">Mandam uma resposta com um número representando sua temperatura, para melhorar a dinamica do projeto cada servidor possui um <em>range</em> de temperatura para retornar.</li>
</ol>
<pre><code class="has-line-data" data-line-start="21" data-line-end="36" class="language-python"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get_temperature</span><span class="hljs-params">()</span>:</span> <span class="hljs-comment"># Função que retorna temperatura do servidor</span>
print(<span class="hljs-string">"Checking temperature on server 1"</span>)
time.sleep(randrange(<span class="hljs-number">5</span>))
<span class="hljs-keyword">return</span> randrange(<span class="hljs-number">30</span>) - <span class="hljs-number">6</span>
<span class="hljs-keyword">if</span> __name__ == <span class="hljs-string">"__main__"</span>:
connection, address = create_connection(HOST, PORT)
print(<span class="hljs-string">"Connected by {}"</span>.format(address))
<span class="hljs-keyword">while</span> <span class="hljs-keyword">True</span>:
data = connection.recv(MESSAGE_SIZE_IN_BYTES) <span class="hljs-comment"># 1. Recebe requisição/conexão</span>
temperature = get_temperature()
print(<span class="hljs-string">"Temperature on server 3 is {}"</span>.format(temperature))
connection.sendall(str(temperature).encode(<span class="hljs-string">"utf-8"</span>)) <span class="hljs-comment"># 2. Envia a resposta </span>
</code></pre>
<h3 class="code-line" data-line-start=36 data-line-end=37><a id="Cache_36"></a>Cache:</h3>
<p class="has-line-data" data-line-start="37" data-line-end="38">Na cache é mantido a tabela dos dados de temperatura dos servidores e o prazo de validade para cada entrada e em caso de requisição retorna os valores guardados se estiverem validos ou faz uma nova consulta caso contrario.</p>
<ol>
<li class="has-line-data" data-line-start="38" data-line-end="39">É estabelicida conexão com cada servidor, e salvo na estrutura servers[]</li>
<li class="has-line-data" data-line-start="39" data-line-end="40">Em seguida é inicializada a tabela cache com uma linha para cada servidor ( ainda sem valores dos servidores ).</li>
<li class="has-line-data" data-line-start="40" data-line-end="41">Cria conexão da Cache, escutando no HOST e PORT especificados.</li>
<li class="has-line-data" data-line-start="41" data-line-end="42">Ao receber uma nova conexão;</li>
<li class="has-line-data" data-line-start="42" data-line-end="43">Para cada linha na tabela;</li>
<li class="has-line-data" data-line-start="43" data-line-end="44">Realiza a checagem de validez dos dados;</li>
<li class="has-line-data" data-line-start="44" data-line-end="45">Se invalido faz uma requisição para atualizar pegar os valores.</li>
<li class="has-line-data" data-line-start="45" data-line-end="46">Se valido pega os valores da tabela cache</li>
<li class="has-line-data" data-line-start="46" data-line-end="47">Envia a resposta da requisição.</li>
</ol>
<pre><code class="has-line-data" data-line-start="48" data-line-end="93" class="language-python"><span class="hljs-keyword">if</span> __name__ == <span class="hljs-string">"__main__"</span>:
<span class="hljs-comment"># 1. Cria conexão com servidores</span>
servers = []
print(<span class="hljs-string">"Establishing connection with server 1"</span>)
servers.append(make_connection_to_server(HOST_1, PORT_1))
print(<span class="hljs-string">"Establishing connection with server 2"</span>)
servers.append(make_connection_to_server(HOST_2, PORT_2))
print(<span class="hljs-string">"Establishing connection with server 3"</span>)
servers.append(make_connection_to_server(HOST_3, PORT_3))
<span class="hljs-comment"># 2. Inicializa tabela cache</span>
CACHE_TABLE = init_cache_table(servers)
<span class="hljs-comment"># 3. Inicializa conexão cache (cache listen on cache host, port)</span>
connection, address = create_connection(CACHE_HOST, CACHE_PORT)
print(<span class="hljs-string">"Connected by {}"</span>.format(address))
<span class="hljs-keyword">while</span>(<span class="hljs-keyword">True</span>):
<span class="hljs-comment"># 4. Recebe nova conexão</span>
data = connection.recv(MESSAGE_SIZE_IN_BYTES)
temperature_from_servers = []
<span class="hljs-comment"># 5. Para cada linha na tabela cache</span>
<span class="hljs-keyword">for</span> cache_row <span class="hljs-keyword">in</span> CACHE_TABLE:
is_from_cache = <span class="hljs-keyword">True</span>
<span class="hljs-comment"># 6. Checagem se o valor é valido</span>
<span class="hljs-keyword">if</span> already_expired_cache_server_row(cache_row):
is_from_cache = <span class="hljs-keyword">False</span>
print(<span class="hljs-string">"Cache from {} is expired, requesting a new temperature"</span>.format(cache_row.get(<span class="hljs-string">"server_name"</span>)))
<span class="hljs-comment"># 7. Se invalido faz uma requisição para atualizar pegar os valores</span>
cache_row = request_temperature_from_server(cache_row)
print(<span class="hljs-string">"Updating row {} from cache table"</span>.format(cache_row.get(<span class="hljs-string">"server_name"</span>)))
update_cache_table(cache_row)
<span class="hljs-keyword">else</span>:
<span class="hljs-comment"># 8. Se valido pega os valores da tabela cache</span>
print(<span class="hljs-string">"Cache from {} stil valid, getting temperature from cache"</span>.format(cache_row.get(<span class="hljs-string">"server_name"</span>)))
print()
temperature_from_servers.append({
<span class="hljs-string">"temperature"</span>: cache_row.get(<span class="hljs-string">"temperature"</span>),
<span class="hljs-string">"is_from_cache"</span>: is_from_cache,
<span class="hljs-string">"server_name"</span>: cache_row.get(<span class="hljs-string">"server_name"</span>)
})
<span class="hljs-comment"># 9. Retorna os valores</span>
connection.sendall(str(json.dumps(temperature_from_servers)).encode(<span class="hljs-string">"utf-8"</span>))
time.sleep(<span class="hljs-number">5</span>)
</code></pre>
<h3 class="code-line" data-line-start=93 data-line-end=94><a id="Cliente_93"></a>Cliente</h3>
<p class="has-line-data" data-line-start="94" data-line-end="95">No cliente é executado a requisição das temperaturas dos servidores para a cache.</p>
<ol>
<li class="has-line-data" data-line-start="95" data-line-end="96">É estabelecida conexão com a cache.</li>
<li class="has-line-data" data-line-start="96" data-line-end="97">Envia a requisição;</li>
<li class="has-line-data" data-line-start="97" data-line-end="98">Recebe a resposta;</li>
<li class="has-line-data" data-line-start="98" data-line-end="99">Print dos resultados</li>
</ol>
<pre><code class="has-line-data" data-line-start="100" data-line-end="133" class="language-python">
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">make_connection_to_server</span><span class="hljs-params">(host, port)</span>:</span>
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect((host, port))
time.sleep(<span class="hljs-number">1</span>)
<span class="hljs-keyword">return</span> client
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">print_result</span><span class="hljs-params">(temperature_informations)</span>:</span>
is_from_cache = <span class="hljs-string">"WAS"</span> <span class="hljs-keyword">if</span> temperature_informations.get(<span class="hljs-string">"is_from_cache"</span>) <span class="hljs-keyword">else</span> <span class="hljs-string">"WAS NOT"</span>
temperature = temperature_informations.get(<span class="hljs-string">"temperature"</span>)
server = temperature_informations.get(<span class="hljs-string">"server_name"</span>)
print(<span class="hljs-string">"Temperature on {} is {} and {} received from cache"</span>.format(server, temperature, is_from_cache))
<span class="hljs-keyword">if</span> __name__ == <span class="hljs-string">'__main__'</span>:
<span class="hljs-keyword">pass</span>
<span class="hljs-comment"># 1. Cria conexão com cache</span>
client = make_connection_to_server(CACHE_HOST, CACHE_PORT)
<span class="hljs-keyword">while</span> <span class="hljs-keyword">True</span>:
<span class="hljs-comment"># 2. Envia requisição para cache</span>
client.sendall(<span class="hljs-string">b"Get temperature"</span>)
<span class="hljs-comment"># 3. Recebe resposta</span>
temperatures = client.recv(MESSAGE_SIZE_IN_BYTES)
temperatures = json.loads(temperatures.decode(<span class="hljs-string">"utf-8"</span>))
<span class="hljs-comment"># 4. Print resposta</span>
<span class="hljs-keyword">for</span> temperature <span class="hljs-keyword">in</span> temperatures:
print_result(temperature)
print()
</code></pre>
<h3 class="code-line" data-line-start=134 data-line-end=135><a id="Como_executar_134"></a>Como executar</h3>
<p class="has-line-data" data-line-start="136" data-line-end="137">Digite os seguintes comandos no terminal</p>
<p class="has-line-data" data-line-start="138" data-line-end="139">Cada comando deve ser executado em um próprio terminal</p>
<pre><code class="has-line-data" data-line-start="140" data-line-end="142" class="language-bash">$ python3 servidor1.py
</code></pre>
<pre><code class="has-line-data" data-line-start="143" data-line-end="145" class="language-bash">$ python3 servidor2.py
</code></pre>
<pre><code class="has-line-data" data-line-start="146" data-line-end="148" class="language-bash">$ python3 servidor3.py
</code></pre>
<pre><code class="has-line-data" data-line-start="149" data-line-end="151" class="language-bash">$ python3 cache.py
</code></pre>
<pre><code class="has-line-data" data-line-start="152" data-line-end="154" class="language-bash">$ python3 cliente.py
</code></pre>
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