Created
October 17, 2018 07:14
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Flask simplest realtime log file viewer
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| <!DOCTYPE html> | |
| <html lang="en" xmlns="http://www.w3.org/1999/xhtml" dir="ltr" class="uk-height-1-1"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <title>flasktest</title> | |
| <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css" /> | |
| <script defer src="https://use.fontawesome.com/releases/v5.3.1/js/all.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> | |
| </head> | |
| <body> | |
| <section class="section"> | |
| <div class="container"> | |
| <div class="columns is-centered is-mobile"> | |
| <div class="column is-muted notification is-four-fifths"> | |
| <h1 class="title">flasktest</h1> | |
| <h2 class="subtitle">Progress example</h2> | |
| <div id="progress"></div> | |
| </div> | |
| </div> | |
| </div> | |
| <div class="container"> | |
| <div class="columns is-centered is-mobile"> | |
| <div class="column is-dark notification is-four-fifths"> | |
| <div class="is-size-7 has-text-warning" id="display"> | |
| <ul id="display_list"> | |
| </ul> | |
| </div> | |
| </div> | |
| </div> | |
| </div> | |
| </section> | |
| <script type="text/javascript"> | |
| var source = new EventSource("/log"); | |
| source.onmessage = function(event) { | |
| // $('#display').prepend(event.data); | |
| $('#display_list').prepend('<li>'+event.data+'</li>'); | |
| if(event.data == 100){ | |
| source.close() | |
| } | |
| } | |
| var source_progress = new EventSource("/progress"); | |
| source_progress.onmessage = function(event) { | |
| $('#progress').text(event.data+'%'); | |
| $('#progress').value(event.data); | |
| if(event.data == 100){ | |
| source_progress.close() | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| # -*- coding: utf-8 -*- | |
| from flask import Flask, render_template, request, Response | |
| from pygtail import Pygtail | |
| import logging, os, sys, time | |
| app = Flask(__name__) | |
| app.config["SECRET_KEY"] = "SECRETKEYSECRETKEYSECRETKEYSECRETKEYSECRETKEY" | |
| app.config["DEBUG"] = os.environ.get("FLASK_DEBUG", True) | |
| app.config["JSON_AS_ASCII"] = False | |
| LOG_FILE = 'app.log' | |
| log = logging.getLogger('__name__') | |
| logging.basicConfig(filename=LOG_FILE, level=logging.DEBUG) | |
| @app.route('/') | |
| def entry_point(): | |
| log.info("route =>'/env' - hit!") | |
| return render_template('base.html') | |
| @app.route('/progress') | |
| def progress(): | |
| def generate(): | |
| x = 0 | |
| while x <= 100: | |
| yield "data:" + str(x) + "\n\n" | |
| x = x + 10 | |
| time.sleep(0.5) | |
| return Response(generate(), mimetype= 'text/event-stream') | |
| @app.route('/log') | |
| def progress_log(): | |
| def generate(): | |
| for line in Pygtail(LOG_FILE, every_n=1): | |
| yield "data:" + str(line) + "\n\n" | |
| time.sleep(0.5) | |
| return Response(generate(), mimetype= 'text/event-stream') | |
| @app.route('/env') | |
| def show_env(): | |
| log.info("route =>'/env' - hit") | |
| env = {} | |
| for k,v in request.environ.items(): | |
| env[k] = str(v) | |
| log.info("route =>'/env' [env]:\n%s" % env) | |
| return env | |
| if __name__ == '__main__': | |
| app.run(debug=True) | |
Thanks for publishing this! The example is mostly working for me. Though there is an issue when a log file is growing faster than 1 message per second - the displayed log is lagging behind the log file. Reducing sleep time to 0.1 fixed the issue.
thanks for the sharing. It works for me. When I first copied the code, I missed "data:" and "\n\n". It is important the line should be:
yield "data:" + str(line) + "\n\n"
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Appreciate it if you can show me how to initiate start of tailing on button click