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‎Dockerfile

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FROM python
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WORKDIR /code
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COPY bin .
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RUN pip install --upgrade pip
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RUN pip install -r requirements.txt
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# CMD "python app.py"

‎README.md

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# python-web-matplotlib-spectrogram-graph
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## Description
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A demo of creating a spectrogram graph.
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A spectrogram can be defined as the visual representation of frequencies against time which shows the signal strength at a particular time. In simple words, a spectrogram is nothing but a picture of sound. It is also called voiceprint or voice grams. A spectrogram is shown using many colors which indicates the signal strengths. If the color is bright then it means that the energy of the signal is high. In other words, brightness of the color is directly proportional to the strength of the signal in spectrogram.
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## Tech stack
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- numpy
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- matplotlib
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- pandas
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## Docker stack
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- python:latest
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## To run
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`sudo ./install.sh -u`
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[Availble here](http://localhost)
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## To stop
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`sudo ./install.sh -d`
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## To see help
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`sudo ./install.sh -h`

‎bin/app.py

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from flask import Flask, render_template, request
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import matplotlib.pyplot as plt
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import numpy as np
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import logging
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logging.basicConfig(level=logging.INFO)
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app = Flask(
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__name__,
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instance_relative_config=False,
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template_folder="templates"
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)
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def create_graph():
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filename = 'demo'
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# random but consistant data
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lst = [2,9,4,6,4]
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# clear buffer
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plt.clf()
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plt.specgram(lst, Fs=6, cmap="rainbow")
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plt.savefig(f'static/img/{filename}.png')
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@app.route('/', methods=['GET'])
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def getIndex():
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create_graph()
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return render_template("index.html")
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@app.errorhandler(404)
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def page_not_found(e):
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return "<h1>404</h1><p>The resource could not be found.</p>", 404
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if __name__ == "__main__":
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app.run(host ='0.0.0.0', port = 5000, debug = True)

‎bin/requirements.txt

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# Lib for web
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flask
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# Lib for graph
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matplotlib
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pandas
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numpy

‎bin/static/img/out.png

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‎bin/templates/index.html

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{% extends 'layout.html' %}
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{% block content %}
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<img src="{{ url_for('static', filename='img/demo.png') }}" alt="chart-image" width="auto" height="auto">
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{% endblock %}

‎bin/templates/layout.html

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<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<title>Matplot demo</title>
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</head>
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<body>
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{% include 'nav.html' %}
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<div class="container">
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{% block content %}{% endblock %}
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</div>
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</body>

‎bin/templates/nav.html

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<!-- this is header -->
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<nav class="navbar navbar-inverse static-top">
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<a class="navbar-text">Matplot graph demo</a>
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</nav>

‎general.log

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[2024-03-16 23:24:40 INFO]: install::setup-logging ended
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================
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[2024-03-16 23:24:40 INFO]: install::start-up started
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[2024-03-16 23:24:40 INFO]: install::start-up starting services
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[2024-03-16 23:24:40 INFO]: install::start-up ended
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================

‎install.sh

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#!/usr/bin/env bash
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basefile="install"
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logfile="general.log"
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timestamp=`date '+%Y-%m-%d %H:%M:%S'`
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if [ "$#" -ne 1 ]; then
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msg="[ERROR]: $basefile failed to receive enough args"
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echo "$msg"
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echo "$msg" >> $logfile
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exit 1
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fi
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function setup-logging(){
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scope="setup-logging"
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info_base="[$timestamp INFO]: $basefile::$scope"
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echo "$info_base started" >> $logfile
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echo "$info_base removing old logs" >> $logfile
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rm -f $logfile
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echo "$info_base ended" >> $logfile
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echo "================" >> $logfile
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}
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function root-check(){
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scope="root-check"
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info_base="[$timestamp INFO]: $basefile::$scope"
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echo "$info_base started" >> $logfile
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#Make sure the script is running as root.
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if [ "$UID" -ne "0" ]; then
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echo "[$timestamp ERROR]: $basefile::$scope you must be root to run $0" >> $logfile
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echo "==================" >> $logfile
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echo "You must be root to run $0. Try the following"
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echo "sudo $0"
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exit 1
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fi
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echo "$info_base ended" >> $logfile
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echo "================" >> $logfile
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}
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function docker-check() {
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scope="docker-check"
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info_base="[$timestamp INFO]: $basefile::$scope"
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cmd=`docker -v`
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echo "$info_base started" >> $logfile
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if [ -z "$cmd" ]; then
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echo "$info_base docker not installed"
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echo "$info_base docker not installed" >> $logfile
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fi
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echo "$info_base ended" >> $logfile
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echo "================" >> $logfile
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}
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function docker-compose-check() {
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scope="docker-compose-check"
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info_base="[$timestamp INFO]: $basefile::$scope"
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cmd=`docker-compose -v`
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echo "$info_base started" >> $logfile
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if [ -z "$cmd" ]; then
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echo "$info_base docker-compose not installed"
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echo "$info_base docker-compose not installed" >> $logfile
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fi
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echo "$info_base ended" >> $logfile
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echo "================" >> $logfile
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}
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function usage() {
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echo ""
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echo "Usage: "
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echo ""
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echo "-u: start."
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echo "-d: tear down."
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echo "-h: Display this help and exit."
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echo ""
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}
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function start-up(){
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local scope="start-up"
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local docker_img_name=`head -n 1 README.md | sed 's/# //'`
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local info_base="[$timestamp INFO]: $basefile::$scope"
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echo "$info_base started" >> $logfile
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echo "$info_base starting services" >> $logfile
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docker build -t $docker_img_name .
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docker run -ti --rm -p 80:5000 -w /code -v $(pwd)/bin:/code $docker_img_name bash -c "python3 app.py"
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echo "$info_base ended" >> $logfile
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echo "================" >> $logfile
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}
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function tear-down(){
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scope="tear-down"
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info_base="[$timestamp INFO]: $basefile::$scope"
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echo "$info_base started" >> $logfile
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echo "$info_base starting services" >> $logfile
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echo "$info_base ended" >> $logfile
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echo "================" >> $logfile
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}
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root-check
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docker-check
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docker-compose-check
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while getopts ":udh" opts; do
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case $opts in
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u)
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setup-logging
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start-up ;;
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d)
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tear-down ;;
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h)
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usage
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exit 0 ;;
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/?)
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usage
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exit 1 ;;
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esac
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done

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