第一部分 | mega.nz | 在线演示 | Github
可能是本文的续篇，其中我将Habr打包到数据库中。现在是应用它的时候了。
小型编辑使生活更轻松
我们通过创建索引来加速数据库。
CREATE INDEX article_indx ON articles(id);
CREATE INDEX comments_indx ON comments(article);
创建索引的请求时间为1 s。
第一行的请求时间为5毫秒。
— 10 .
, (SSD ).
- ( ). sqlite3worker . , , .
from sqlite3worker import Sqlite3Worker
from multiprocessing.dummy import Pool as ThreadPool
from datetime import datetime
import json
import requests
import logging
sql_worker = Sqlite3Worker("habr.db")
sql_worker.execute("CREATE TABLE IF NOT EXISTS comments(id INTEGER,"
"parent_id INTEGER,"
"article INTEGER,"
"level INTEGER,"
"timePublished TEXT,"
"score INTEGER,"
"message TEXT,"
"children TEXT,"
"author TEXT)")
def worker(i):
url = "https://m.habr.com/kek/v2/articles/{}/comments/?fl=ru%2Cen&hl=ru".format(i)
try:
r = requests.get(url)
if r.status_code == 503:
logging.critical("503 Error")
raise SystemExit
except:
with open("req_errors.txt", "a") as file:
logging.critical("requests error")
file.write(str(i))
return 2
try: data = json.loads(r.text)
except: logging.warning("[{}] Json loads failed".format(i))
if data['success']:
comments = data['data']['comments']
for comment in comments:
current = comments[comment]
id = current['id']
parent_id = current['parentId']
article = i
level = current['level']
time_published = current['timePublished']
score = current['score']
message = current['message']
children = [children for children in current['children']]
author = current['author']
try: data = (id,
parent_id,
article,
level,
time_published,
score,
message,
str(children),
str(author['login']))
except:
data = (None, None, None, None, None, None, None, None, None)
sql_worker.execute("INSERT INTO comments VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)", data)
logging.info("Comments on article {} were parsed".format(i))
min = 490000
max = 495000
pool = ThreadPool(3)
start_time = datetime.now()
results = pool.map(worker, range(min, max))
pool.close()
pool.join()
sql_worker.close()
print(datetime.now() - start_time)
dug .
.
-
, , -.
Flask, , .
Flask, .
DEBUG — — . .. , .
from flask import Flask, g, render_template, request, redirect, url_for
import sqlite3
app = Flask(__name__)
app.config['DEBUG'] = True
app.config['SECRET_KEY'] = 'supersecretkey'
DATABASE = "./habr.db"
-
.
def get_db():
db = getattr(g, '_database', None)
if db is None:
db = g._database = sqlite3.connect(DATABASE)
return db
. , . , .
@app.route("/")
def index():
return render_template("index.html")
/post/id, .
@app.route('/post/<int:post_id>/')
def show_post(post_id):
cur = get_db().cursor()
res = cur.execute("SELECT * FROM articles WHERE id = :id", {"id": post_id} )
article = res.fetchone()
return render_template("post.html", post=article)
/post/id page
. Flask html- .
templates html-, Jinja.
, , title , .
, {{ var }} = print(var) Python.
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>{{ post[3] }}</title>
</head>
<body>
</body>
</html>
.
.
<div class="header">
<h1 class="display-4">{{ post[3] }}</h1>
<br>
<p class="">
<strong>{{ date }}</strong> <strong> {{ post[2] }}</strong>
</p>
{% if post[9] == 1 %}
<mark>Tutorial</mark> <br>
{% endif %}
<i class="fas fa-comments"></i> {{ post[6] }} |
<i class="fas fa-arrows-alt-v"></i> {{ post[8] }} |
<i class="fas fa-eye"></i> {{ post[7] }}
</div>
<div class="content">
<div>
<p>{{ post[4]|safe }}</p>
</div>
<br>
<strong><i class="fas fa-tags"></i> :</strong> {{ post[10] }}
</div>
</div>
. comments.
,
@app.route('/post/<int:post_id>/')
def show_post(post_id):
cur = get_db().cursor()
...
res = cur.execute("SELECT * FROM comments WHERE article = :id", {"id": post_id} )
comments = res.fetchall()
return render_template("post.html", post=article, comments=comments)
:
<div id="comments">
<h2></h2>
{% for comment in comments %}
<div id="{{ comment[0] }}" class="shadow-sm p-3 mb-5 bg-light rounded">
<div class="comment-header">
<small>#{{comment[0]}}</small>
<strong>{{ comment[8] }}</strong>
<small>{{comment[4]}} | <i class="fas fa-arrows-alt-v"></i> {{ comment[5] }}</small>
</div>
{% if comment[1] != 0 %}
<small><a href="#{{comment[1]}}"><mark> #{{ comment[1] }}</mark></a></small>
{{comment[6]|safe}}
{% else %}
{{comment[6]|safe}}
{% endif %}
<br>
</div>
{% endfor %}
</div>
Jinja {% %}
Index page
— .
, , .
POST- :
main.py
@app.route('/', methods=['POST'])
def index_post():
text = request.form['url']
id = ''.join(x for x in text if x.isdigit())
if id != '':
return redirect(url_for('show_post', post_id=id))
else: return " "
index.html
...
<form method="POST">
<input type="url" name="url">
<div>
<button type="submit" id="search"></button>
</div>
</form>
...
:
@app.route("/")
def index():
cur = get_db().cursor()
res = cur.execute("SELECT min(id), max(id) FROM articles")
counter = res.fetchone()
return render_template("index.html", counter = counter)
...
<div class="container">
...
<p> = {{ counter[0] }}..{{ counter [1] }}</p>
...
</div>
...
:
-
: .
import dateutil.parser
from datetime import datetime
...
@app.route('/post/<int:post_id>/')
def show_post(post_id):
...
date = dateutil.parser.parse(article[1])
date = datetime.strftime(date, "%d.%m.%Y %H:%M")
...
return render_template("post.html", post=article, date=date, comments=comments)
lazy load , , :
//
(async () => {
for (let node of document.getElementsByTagName('img')) {
await new Promise(res => {
if(node.dataset.src !== undefined){
node.src = node.dataset.src;
node.onload = () => res();
}
})
}
})();
, , , data-src
, "" :
$(document).on('click', '.spoiler_title', function (e) {
e.preventDefault();
$(this).toggleClass('active');
$(this).parent().find('.spoiler_text').first().slideToggle(300);
});
. , Darkmode.js
<script src="https://cdn.jsdelivr.net/npm/darkmode-js@1.5.5/lib/darkmode-js.min.js"></script>
<script>
new Darkmode().showWidget();
</script>
, - , - ( ).
( !) flask .
export FLASK_APP=main.py
export FLASK_ENV=production
flask run
, , , , - uWSGI, nginx.
— uWSGI, , , .
pip install uwsgi
uwsgi --socket 0.0.0.0:3031 --protocol http --wsgi-file main.py --callable app
, — , nginx,
, , . , - .
, , ( , ).
github.
另外，由于我的VPS弱和可能的habraeffect，该站点可能不可用。如果有人举起类似的服务器，那就太好了。