CODEWITHSUNDEEP
pythonflaskreportlab
Noor Yadallee
Noor Yadallee

Reputation: 1

Why does Flask + ReportLab lets me only make 1 pdf before I need to restart server?

I am trying to make a small app for making pdfs and all is good until I try to make a second pdf.

Here are the steps to encounter the issue:

This is the flask app I am using. create.html is just a html form and the data grabbed will be sent to pdfCreater.py to generate the

from flask import Flask, render_template, request, redirect, url_for
import pdfcreater 

app = Flask(__name__)

@app.route("/", methods=["POST", "GET"])
def index():
    if request.method == 'POST':
        keys  = request.form.keys()
        data = []
        temp = []

        for key in keys:
           temp.append(request.form[key])

        for i in range(0, len(temp), 4):
            data.append([temp[i], temp[i+1], temp[i+2], temp[i+3]])
        print()
        return redirect(url_for("createPdf", formData=data))
    else:
        return render_template("create.html")

@app.route("/<formData>")
def createPdf(formData):
    pdfcreater.main(formData)

    return f"<h1>{formData}</h1>"


if __name__ == '__main__':
    app.run(debug=True)

Here is pdfCreater.py:

from reportlab.pdfgen import canvas
from reportlab.lib.units import inch, cm
from reportlab.lib.pagesizes import letter
from reportlab.platypus import Spacer, SimpleDocTemplate, Table, TableStyle, Paragraph, paragraph
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
        

story = [Spacer(1, 0)]

def main(data):
   
    def my_first_page(canvas, doc):
 
        styles = getSampleStyleSheet()
        title_style = ParagraphStyle(
            name='TitleStyle',
            parent=styles['Title'],  # Inherit from the default Title style
            fontName='Helvetica-Bold',  # Specify the font name
            fontSize=24,  # Set the font size
            leading=28,  # Adjust line spacing
            alignment=1  # Center the title
        )


        centered_style = ParagraphStyle(
            name='CenteredStyle',
            parent=styles['Normal'],  # Inherit from the default Normal style
            alignment=1,  # Align the text to the center
            fontSize=14,
            leading=16
        )


        customer_style = ParagraphStyle(
            name='CenteredStyle',
            parent=styles['Normal'],  # Inherit from the default Normal style
            alignment=1,  # Align the text to the center
            fontSize=16,
            leading=20
        )



        left_align = ParagraphStyle(
            name='reightAlignedStyle',
            parent=styles['Normal'],  # Inherit from the default Normal style
            alignment=0,  # Align the text to the right
            fontSize=14,
            leading=0
        )

        right_align = ParagraphStyle(
            name='reightAlignedStyle',
            parent=styles['Normal'],  # Inherit from the default Normal style
            alignment=2,  # Align the text to the right
            fontSize=14,
            leading=16
        )


        sig_style = ParagraphStyle(
            name='signature',
            parent=styles['Normal'],  # Inherit from the default Normal style
            alignment=0,  # Align the text to the right
            fontSize=11,
            leading=0
        )


        styles = getSampleStyleSheet()
        blank_line = Paragraph("", title_style)
        title = Paragraph("SOMETHING SOMETHING", title_style)
        story.append(title)
    

        line_of_text = Paragraph(CONFIDENTIAL", centered_style)
        story.append(line_of_text)
        story.append(blank_line)


        date_invoice = "Date: 22/12/00"
        iNum = 12345
        invoice_num = f"Invoice: {iNum}"
        l1 = Paragraph(date_invoice, left_align)
        l2 = Paragraph(invoice_num, right_align)
        story.append(l1)
        story.append(l2)


        customer = "customeeeeeeeeeeeeeeeeeeeeeeeeeer"
        l3 = Paragraph(customer, customer_style)
        story.append(l3)


        
        invoice_data = [["gdata", "a", "b", "c"]]
        invoice_data = [
        ['Item', 'Description', 'Description', 'Price'],
        ['Item 2', 'Description 2', 'Description 1', 'Price']
            ]
        print("=================", data[0])
        for item in data:
            invoice_data.append(item)

        while len(invoice_data) < 21:
            invoice_data.append([])
        # ... other items
        

        styles = getSampleStyleSheet()
        table = Table(invoice_data, colWidths=[1.25 * cm, 12.25 * cm, 2.5 *cm, 3 * cm])


        n = -1
    # Apply table styles (customize as needed)
        table.setStyle(TableStyle([
            ('ALIGN', (1, 1), (-1, -1), 'LEFT'),
            ('TEXTCOLOR', (0, 0), (-1, 0), 'grey'),
            ('SPAN', (0, n), (2, n)),
            ('VALIGN', (0, 0), (-1, -1), 'MIDDLE'),
            ('INNERGRID', (0, 0), (-1, -1), 0.25, 'black'),
            ('BOX', (0, 0), (-1, -1), 0.25, 'black'),
        ]))


        story.append(table)

        for i in range(6):
            story.append(blank_line)
        sig = Paragraph("_"*24, left_align)
        story.append(sig)
        story.append(blank_line) 
        story.append(blank_line) 
        story.append(blank_line) 
        story.append(Paragraph('Signature of customer/receiving officer', sig_style))
            
        story.append(blank_line) 
        story.append(blank_line) 
        story.append(blank_line) 
        story.append(blank_line) 
        story.append(blank_line) 

        story.append(sig)
        story.append(blank_line)
        story.append(blank_line) 
        story.append(blank_line)
        story.append(Spacer(5 * cm, 0)) 
        story.append(Paragraph('Name of customer/receiving officer', sig_style))
    try:
        print("-----------",type(eval(data)) == type([]))

        if type(eval(data)) == type([]):  
        
            data = eval(data)

            # fetch_data(data)
            doc = SimpleDocTemplate("invoice.pdf", pagesize=letter)
            # Assuming 'taaable' is your table object

            doc.build(story, onFirstPage=my_first_page, onLaterPages=my_first_page)

    except:
        pass

Any idea why this happens? Thanks in advance!

After searching the internet I tried caching as well as trying to identify bottlenecks in the code but couldn't find anything.

Upvotes: 0

Views: 22

Answers (0)

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