I got a strange situation and i can't figure out what's the problem.
I want to use ajax to make a request on the server (Raspberry Pi 3) that use php.
The php script handle the request, run a python script with shell_exec and return the result of the shell_exec to the client.
The python script execute a prediction of Tensorflow Lite model and print the result.
The problem is that my shell_exec() is not executed and the php return a response with status 200 and response = 0.
I thought it was some timeout on server because python script need 10 seconds to print a result, but changing python code to only a "sleep(180)" make the ajax request waiting for 3 minutes.
Change the python script back.
So, I think it's some about the python script.
Running
php server.php
on raspberry I got the output of the python script as I exepct.
So, maybe it's something about apache user who run php script (www-data, etc...). I changed permission of all files to 777 but the error still persist.
ajax.html
<!DOCTYPE html>
<html lang="it">
<head>
<title>Ajax Example</title>
<meta charset="utf-8">
<script>
function reply() {
$.ajax({
url: 'risposta.php',
type: 'POST',
contentType: false,
processData: false,
async: true,
timeout: 0,
success: function(response){
if(response != 0){
document.getElementById("result").innerHTML = response;
}else{
alert('Error');
}
},
});
}
</script>
</head>
<body>
<form id="formesempio">
<input type="text" id="nome">
<input type="button" value="Play" onclick="javascript:reply()">
</form>
<p>Result: <span id="result"></span></p>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</body>
</html>
server.php
<?php
$command = "python3 /var/www/html/DBR/predict.py --fn /var/www/html/img.jpg";
$out = shell_exec($command);
echo $out;
?>
predict.py
from tflite_runtime.interpreter import Interpreter
from PIL import Image
import numpy as np
import time
import argparse
import pandas as pd
from DBR_utils import print_human_readable_dog_deploy, get_dog_from_predictions
# Variabili globali
model_path = "DBR/DBR.tflite"
label_path = "DBR/IT_breeds.txt"
def set_input_tensor(interpreter, image):
tensor_index = interpreter.get_input_details()[0]['index']
input_tensor = interpreter.tensor(tensor_index)()[0]
input_tensor[:, :] = image
def classify_image(interpreter, image, top_k=1):
set_input_tensor(interpreter, image)
interpreter.invoke()
output_details = interpreter.get_output_details()[0]
output = interpreter.get_tensor(output_details['index'])
return output
# -- Parser --
parser = argparse.ArgumentParser(description='DBR')
parser.add_argument('--fn', type=str, required=True, help='filename')
args = parser.parse_args()
interpreter = Interpreter(model_path)
#print("Model Loaded Successfully.")
interpreter.allocate_tensors()
_, height, width, _ = interpreter.get_input_details()[0]['shape']
#print("Image Shape (", width, ",", height, ")")
# Load an image to be classified.
image = Image.open(args.fn).convert('RGB').resize((width, height))
# Classify the image.
time1 = time.time()
output = classify_image(interpreter, image)
time2 = time.time()
classification_time = np.round(time2-time1, 3)
#print("Classificaiton Time =", classification_time, "seconds.")
labels = []
with open(label_path, 'r') as f:
tmp = f.readlines()
for l in tmp:
labels.append(l.rstrip())
labels = pd.Series(labels)
dog = get_dog_from_predictions(np.squeeze(output), labels, args.fn)
res = print_human_readable_dog_deploy(dog)
print(res)
Related
I know this is asked before also, but I am a newbie in scraping and python. Please help me and it would be very much helpful in my learning path.
I am scraping a news site using python with packages such as Beautiful Soup and etc.
I am facing difficulty while getting the value of java script variable which is declared in script tag and also it is getting updated there.
Here is the part of HTML page which I am scraping:(containing only script part)
<!-- Eliminate render-blocking JavaScript and CSS in above-the-fold content -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/js/materialize.min.js"></script>
<script type="text/javascript" src="/dist/scripts/index.js"></script>
<script type="text/javascript" src="/dist/scripts/read.js"></script>
<script src="/dist/scripts/jquery.scrolldepth.min.js"></script>
<script type="text/javascript">
var min_news_id = "d7zlgjdu-1"; // line 1
function loadMoreNews(){
$("#load-more-btn").hide();
$("#load-more-gif").show();
$.post("/en/ajax/more_news",{'category':'politics','news_offset':min_news_id},function(data){
data = JSON.parse(data);
min_news_id = data.min_news_id||min_news_id; // line 2
$(".card-stack").append(data.html);
})
.fail(function(){alert("Error : unable to load more news");})
.always(function(){$("#load-more-btn").show();$("#load-more-gif").hide();});
}
jQuery.scrollDepth();
</script>
From the above part, I want to get the value of min_news_id in python.
I should also get the value of same variable if updated from line 2.
Here is how I am doing it:
self.pattern = re.compile('var min_news_id = (.+?);') // or self.pattern = re.compile('min_news_id = (.+?);')
page = bs(htmlPage, "html.parser")
//find all the scripts tag
scripts = page.find_all("script")
for script in scripts:
for line in script:
scriptString = str(line)
if "min_news_id" in scriptString:
scriptString.replace('"', '\\"')
print(scriptString)
if(self.pattern.match(str(scriptString))):
print("matched")
data = self.pattern.match(scriptString)
jsVariable = json.loads(data.groups()[0])
InShortsScraper.newsOffset = jsVariable
print(InShortsScraper.newsOffset)
But I am never getting the value of the variable. Is it problem with my regular expression or any other? Please help me.
Thank You in advance.
html = '''<!-- Eliminate render-blocking JavaScript and CSS in above-the-fold content -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/js/materialize.min.js"></script>
<script type="text/javascript" src="/dist/scripts/index.js"></script>
<script type="text/javascript" src="/dist/scripts/read.js"></script>
<script src="/dist/scripts/jquery.scrolldepth.min.js"></script>
<script type="text/javascript">
var min_news_id = "d7zlgjdu-1"; // line 1
function loadMoreNews(){
$("#load-more-btn").hide();
$("#load-more-gif").show();
$.post("/en/ajax/more_news",{'category':'politics','news_offset':min_news_id},function(data){
data = JSON.parse(data);
min_news_id = data.min_news_id||min_news_id; // line 2
$(".card-stack").append(data.html);
})
.fail(function(){alert("Error : unable to load more news");})
.always(function(){$("#load-more-btn").show();$("#load-more-gif").hide();});
}
jQuery.scrollDepth();
</script>'''
finder = re.findall(r'min_news_id = .*;', html)
print(finder)
Output:
['min_news_id = "d7zlgjdu-1";', 'min_news_id = data.min_news_id||min_news_id;']
#2 OR YOU CAN USE
print(finder[0].replace('min_news_id = ', '').replace('"','').replace(';','').strip())
Output:
d7zlgjdu-1
#3 OR YOU CAN USE
finder = re.findall(r'[a-z0-9]{8}-[0-9]', html)
print(finder)
Output:
['d7zlgjdu-1']
you can't monitor javascript variable change using BeautifulSoup, here how to get next page news using while loop, re and json
from bs4 import BeautifulSoup
import requests, re
page_url = 'https://inshorts.com/en/read/politics'
ajax_url = 'https://inshorts.com/en/ajax/more_news'
htmlPage = requests.get(page_url).text
# BeautifulSoup extract article summary
# page = BeautifulSoup(htmlPage, "html.parser")
# ...
# get current min_news_id
min_news_id = re.search('min_news_id\s+=\s+"([^"]+)', htmlPage).group(1) # result: d7zlgjdu-1
customHead = {'X-Requested-With': 'XMLHttpRequest', 'Referer': page_url}
while min_news_id:
# change "politics" if in different category
reqBody = {'category' : 'politics', 'news_offset' : min_news_id }
# get Ajax next page
ajax_response = requests.post(ajax_url, headers=customHead, data=reqBody).json() # parse string to json
# again, do extract article summary
page = BeautifulSoup(ajax_response["html"], "html.parser")
# ....
# ....
# new min_news_id
min_news_id = ajax_response["min_news_id"]
# remove this to loop all page (thousand?)
break
thank you for the response, Finally I solved using requests package after reading its documentation,
here is my code :
if InShortsScraper.firstLoad == True:
self.pattern = re.compile('var min_news_id = (.+?);')
else:
self.pattern = re.compile('min_news_id = (.+?);')
page = None
# print("Pattern: " + str(self.pattern))
if news_offset == None:
htmlPage = urlopen(url)
page = bs(htmlPage, "html.parser")
else:
self.loadMore['news_offset'] = InShortsScraper.newsOffset
# print("payload : " + str(self.loadMore))
try:
r = myRequest.post(
url = url,
data = self.loadMore
)
except TypeError:
print("Error in loading")
InShortsScraper.newsOffset = r.json()["min_news_id"]
page = bs(r.json()["html"], "html.parser")
#print(page)
if InShortsScraper.newsOffset == None:
scripts = page.find_all("script")
for script in scripts:
for line in script:
scriptString = str(line)
if "min_news_id" in scriptString:
finder = re.findall(self.pattern, scriptString)
InShortsScraper.newsOffset = finder[0].replace('min_news_id = ', '').replace('"','').replace(';','').strip()
I'm trying to stream some data, to update progress bar on my website. For testing I'm running this:
#application.route('/api/stream', methods=['GET', 'POST'])
def stream():
def event_stream():
n = 0
while True:
yield "data: %s\n\n" % n
n += 1
time.sleep(1)
return Response(event_stream(), mimetype='text/event-stream')
#application.route('/api/output')
def index():
return """
<!DOCTYPE html>
<html>
<head>
<script>
if(typeof(EventSource)!=="undefined") {
var source=new EventSource("/api/stream");
source.onmessage=function(event) {
document.getElementById("result").innerHTML+=event.data + "<br>";
};
source.update=function(event) {
document.getElementById("result").innerHTML+=event.data + "<br>";
};
} else {
document.getElementById("result").innerHTML="Sorry, your browser does not support server-sent events...";
}
</script>
</head>
<body>
<h1>Data</h1>
<div id="result"></div>
</body>
</html>
"""
and on my website I've got post function:
$.post("//mywebsite.com/api/stream", {"some": 'ss'}, function(data) {
alert(data)
})
And when I run this POST (above) then I'm opening mywebsite.com/api/output and it displays only:
Data
But when after a while I stop my flask app, on the website I'm getting:
Data
0
1
2
Why It's not updating live but only when I stop flask app?
I've built a simple web server that gets a request and send a response. So when the server gets an invalid request, like "localhost/not-a-page", the server will send a response with the content of the HTML file "404.html" the webpage should display an image. So far, so good.
But when the 404 page loads up, the page can't find the image. The HTML part is correct and works offline. I've tried to move the image to serval locations, relative to the Python script, relative to the HTML. But it just can't find it. Hi I'm trying to make the server as low-level as I can, I want to learn how servers work. So I'm not using any server-related libraries. I'm using only the socket library of Python.
I'll appreciate any help to resolve this problem without using other libraries,
EDIT
Here is the relevant Python part :
import socket
import threading
import os
default_error_page = """\
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Error response</title>
</head>
<body>
<center>
<h1>Response</h1>
<p>Error code: %(code)d</p>
<p>Message: %(status)s.</p>
</center>
</body>
</html>
"""
default_header_status = "HTTP/1.1 %(code)d %(status)s\r\n"
default_header_content_type = "Content-Type: text/html; charset=utf-8\r\n\r\n"
buffer_size = 1024
def get_page(code):
page = default_error_page
if code == 200:
pass
else:
file = open(os.path.dirname(__file__) + "/www/not-found.html", 'r')
page = file.read()
return page
class BaseServer:
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_name = ""
host_name = ""
host_port = 8000 # default port
is_shutdown = False
def __init__(self, name):
self.server_name = name
def start_server(self):
thread = threading.Thread(target=self.run_server(), name=self.server_name)
thread.start()
def run_server(self):
self.server_socket.bind((self.host_name, self.host_port)) # bind to host
self.server_socket.listen()
while not self.is_shutdown:
conn, addr = self.server_socket.accept()
self.handle_request(conn, addr)
def handle_request(self, connection, address):
print(str(address[0]) + " Connected! (port " + str(address[1]) + ")")
result = self.parse_request(connection.recv(buffer_size))
if result == 0:
page = self.parse_response(200)
else:
page = self.parse_response(404)
connection.sendall(bytes(page))
def parse_request(self, data):
if len(data) == 0:
return
strings = str(bytes(data).decode('utf-8')).split('\r\n')
command, path, version = strings[0].split()
print("command - " + command)
print("path - " + path)
print("version - " + version)
status = 1
if path == "/":
status = 0
return status
def parse_response(self, code):
status = "ERROR"
if code == 200:
status = "OK"
elif code == 404:
status = "NOT FOUND"
base_header = (default_header_status % {'code': code, 'status': status})
base_content_type = default_header_content_type
# page = (default_error_page % {'code': code, 'status': status})
page = str(get_page(code))
return_string = str(base_header + base_content_type + page).encode('utf-8')
print(return_string)
return return_string
def main():
server = BaseServer("Home Server")
server.start_server()
if __name__ == "__main__":
main()
And this is the HTML:
<html>
<head>
<link rel="stylesheet" type="text/css" href="/style/main.css"/>
<style>
*{
padding:0;
margin:0;
}
body{
background-color:#ffe6b3;
}
h1{
margin-top:30px;
background-color:#ffcc66;
font-size:3em;
display:inline-block;
color:#3a0000;
}
p{
margin-top:80px;
font-size:2em;
color:#3a0000;
}
#img404{
background-image:url(../images/404.gif);
width:100%;
height:50%;
background-repeat:no-repeat;
background-position:center 20%;
}
</style>
</head>
<body>
<center>
<div class=top>
<h1>ERROR 404</h1>
</div>
<p>
Sorry, we could not find the page :(
</p>
<div id="img404">
</div>
</center>
</body>
</html>
Sorry if it's not very readable, but I'm on the phone.
Dima.
Don't use relative paths for image like ../images/img.gif. Rather use full url or url relative to the root.
http://localhost/images/img.gif - full url
/images/img.gif - path relative to root url
Figured out my problem.
After I saw the logs, I realized that the browser sends another request, for the image.
And silly me, my code is:
if path ="/":
status = 0
else:
status = 1
So for every request which is not root("/") the server will return 404.
Oops
I have configured xampp on windows to work with python 2.7 and Pygments. My php code is highlighted properly in Pygments on the website. The code has colors, span elements, classes.
That is how it looks:
But I cannot get line numbers.
As I have read tutorials it depends on the linenos value in python script. The value should be either table or inline or 1 or True.
But it does not work for me. I still gives the same final code
<!doctype html>
<html lang="pl">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" href="gh.css">
</head>
<body>
<div class="highlight highlight-php"><pre><code><span class="nv">$name</span> <span class="o">=</span> <span class="s2">"Jaś"</span><span class="p">;</span>
<span class="k">echo</span> <span class="s2">"Zażółć gęślą jaźń, "</span> <span class="o">.</span> <span class="nv">$name</span> <span class="o">.</span> <span class="s1">'.'</span><span class="p">;</span>
<span class="k">echo</span> <span class="s2">"hehehe#jo.io"</span><span class="p">;</span>
</code></pre></div>
</html>
How to add line numbers? I put two files of the website below:
index.py
import sys
from pygments import highlight
from pygments.formatters import HtmlFormatter
# If there isn't only 2 args something weird is going on
expecting = 2;
if ( len(sys.argv) != expecting + 1 ):
exit(128)
# Get the code
language = (sys.argv[1]).lower()
filename = sys.argv[2]
f = open(filename, 'rb')
code = f.read()
f.close()
# PHP
if language == 'php':
from pygments.lexers import PhpLexer
lexer = PhpLexer(startinline=True)
# GUESS
elif language == 'guess':
from pygments.lexers import guess_lexer
lexer = guess_lexer( code )
# GET BY NAME
else:
from pygments.lexers import get_lexer_by_name
lexer = get_lexer_by_name( language )
# OUTPUT
formatter = HtmlFormatter(linenos='table', encoding='utf-8', nowrap=True)
highlighted = highlight(code, lexer, formatter)
print highlighted
index.php
<?php
define('MB_WPP_BASE', dirname(__FILE__));
function mb_pygments_convert_code($matches)
{
$pygments_build = MB_WPP_BASE . '/index.py';
$source_code = isset($matches[3]) ? $matches[3] : '';
$class_name = isset($matches[2]) ? $matches[2] : '';
// Creates a temporary filename
$temp_file = tempnam(sys_get_temp_dir(), 'MB_Pygments_');
// Populate temporary file
$filehandle = fopen($temp_file, "w");
fwrite($filehandle, html_entity_decode($source_code, ENT_COMPAT, 'UTF-8'));
fclose($filehandle);
// Creates pygments command
$language = $class_name ? $class_name : 'guess';
$command = sprintf('C:\Python27/python %s %s %s', $pygments_build, $language, $temp_file);
// Executes the command
$retVal = -1;
exec($command, $output, $retVal);
unlink($temp_file);
// Returns Source Code
$format = '<div class="highlight highlight-%s"><pre><code>%s</code></pre></div>';
if ($retVal == 0)
$source_code = implode("\n", $output);
$highlighted_code = sprintf($format, $language, $source_code);
return $highlighted_code;
}
// This prevent throwing error
libxml_use_internal_errors(true);
// Get all pre from post content
$dom = new DOMDocument();
$dom->loadHTML(mb_convert_encoding('
<pre class="php">
<code>
$name = "Jaś";
echo "Zażółć gęślą jaźń, " . $name . \'.\';
echo "<address>hehehe#jo.io</address>";
</code>
</pre>', 'HTML-ENTITIES', "UTF-8"), LIBXML_HTML_NODEFDTD);
$pres = $dom->getElementsByTagName('pre');
foreach ($pres as $pre) {
$class = $pre->attributes->getNamedItem('class')->nodeValue;
$code = $pre->nodeValue;
$args = array(
2 => $class, // Element at position [2] is the class
3 => $code // And element at position [2] is the code
);
// convert the code
$new_code = mb_pygments_convert_code($args);
// Replace the actual pre with the new one.
$new_pre = $dom->createDocumentFragment();
$new_pre->appendXML($new_code);
$pre->parentNode->replaceChild($new_pre, $pre);
}
// Save the HTML of the new code.
$newHtml = "";
foreach ($dom->getElementsByTagName('body')->item(0)->childNodes as $child) {
$newHtml .= $dom->saveHTML($child);
}
?>
<!doctype html>
<html lang="pl">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" href="gh.css">
</head>
<body>
<?= $newHtml ?>
</body>
</html>
Thank you
While reading the file try readlines:
f = open(filename, 'rb')
code = f.readlines()
f.close()
This way you do the following it will get multiple lines :
formatter = HtmlFormatter(linenos='table', encoding='utf-8', nowrap=True)
Suggestion:
More pythonic way of opening files is :
with open(filename, 'rb') as f:
code = f.readlines()
That's it python context manager closes this file for you.
Solved!
nowrap
If set to True, don’t wrap the tokens at all, not even inside a tag. This disables most other options (default: False).
http://pygments.org/docs/formatters/#HtmlFormatter
I want to show OpenCV processed image with web interface (made with CherryPy). Code below works fine:
import cherrypy
import cv2
class Picture(object):
def __init__(self):
self.cam = cv2.VideoCapture(0)
#cherrypy.expose
def index(self):
_, image = self.cam.read()
_, data = cv2.imencode('.jpg', image)
cherrypy.response.headers['Content-Type'] = 'image/jpeg'
return data.tostring()
if __name__ == '__main__':
cherrypy.config.update({'server.socket_host': '127.0.0.1', 'server.socket_port': 80, })
cherrypy.quickstart(Picture())
However: I would like to embed the image in html so I can (for example) add another image or other data to the same page.
I have tried the following code:
import cherrypy
import cv2
class Picture(object):
def __init__(self):
self.cam = cv2.VideoCapture(0)
#cherrypy.expose
def index(self):
_, image = self.cam.read()
_, data = cv2.imencode('.jpeg', image)
return """ <html>
<head>
<title>CherryPy static imagl</title>
</head>
<html>
<body>
<img src=" """ + data + """:image/jpeg" />
</body>
</html>"""
if __name__ == '__main__':
cherrypy.config.update({'server.socket_host': '127.0.0.1', 'server.socket_port': 80, })
cherrypy.quickstart(Picture())
But this gives the following error:
<img src=" """ + data + """:image/jpeg" />
TypeError: cannot concatenate 'str' and 'numpy.ndarray' objects
Converting the numpy arry to a string using the following code also does not work (it gives no error but displays only characters):
<img src=" """ + data.tostring() + """:image/jpeg" />
Anyone who can give me some more insight? Thanks in advance!
The following code does the trick :)
import cherrypy
import cv2
import base64
class Picture(object):
def __init__(self):
self.cam = cv2.VideoCapture(0)
#cherrypy.expose
def index(self):
_, image = self.cam.read()
_, data = cv2.imencode('.jpg', image)
jpeg_base64 = base64.b64encode(data.tostring())
return """
<html>
<head>
<meta http-equiv="refresh" content="1" />
<title>Cherrypy webcam</title>
</head>
<html>
<body>
<img src='data:image/jpeg;base64,%s' />
<img src='data:image/jpeg;base64,%s' />
</body>
</html>
""" % (jpeg_base64, jpeg_base64)
if __name__ == '__main__':
cherrypy.config.update({'server.socket_host': '127.0.0.1', 'server.socket_port': 80, })
cherrypy.quickstart(Picture())
This code displays the same picture two times. and the:
<meta http-equiv="refresh" content="1" />
refreshes the code every second.