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How to Build a Web App with and without Rails Libraries
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# mirth-4.rb | |
# Data persistence with YAML store: | |
# Use YAML to save the birthdays that | |
# can be reused when the server restarts | |
require 'socket' | |
# Require the library to use YAML::Store | |
require 'yaml/store' | |
server = TCPServer.new(1337) | |
# Attain file store from a YAML file | |
store = YAML::Store.new("mirth.yml") | |
loop do | |
client = server.accept | |
request_line = client.readline | |
method_token, target, version_number = request_line.split | |
case [method_token, target] | |
when ["GET", "/show/birthdays"] | |
response_status_code = "200 OK" | |
content_type = "text/html" | |
response_message = "<ul>\n" | |
# Get all the birthdays data in a hash object | |
all_birthdays = {} | |
store.transaction do | |
all_birthdays = store[:birthdays] | |
end | |
all_birthdays.each do |birthday| | |
response_message << "<li> #{birthday[:name]}</b> was born on #{birthday[:date]}!</li>\n" | |
end | |
response_message << "</ul>\n" | |
response_message << <<~STR | |
<form action="/add/birthday" method="post" enctype="application/x-www-form-urlencoded"> | |
<p><label>Name <input type="text" name="name"></label></p> | |
<p><label>Birthday <input type="date" name="date"></label></p> | |
<p><button>Submit birthday</button></p> | |
</form> | |
STR | |
when ["POST", "/add/birthday"] | |
response_status_code = "303 See Other" | |
content_type = "text/html" | |
response_message = "" | |
all_headers = {} | |
while true | |
line = client.readline | |
break if line == "\r\n" | |
header_name, value = line.split(": ") | |
all_headers[header_name] = value | |
end | |
body = client.read(all_headers['Content-Length'].to_i) | |
require 'uri' | |
new_birthday = URI.decode_www_form(body).to_h | |
# Store the user-input birthday data | |
# back into the YAML store | |
store.transaction do | |
store[:birthdays] << new_birthday.transform_keys(&:to_sym) | |
end | |
else | |
response_status_code = "200 OK" | |
response_message = "✅ Received a #{method_token} request to #{target} with #{version_number}" | |
content_type = "text/plain" | |
end | |
http_response = <<~MSG | |
#{version_number} #{response_status_code} | |
Content-Type: #{content_type}; charset=#{response_message.encoding.name} | |
Location: /show/birthdays | |
#{response_message} | |
MSG | |
client.puts http_response | |
client.close | |
end |
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--- | |
:birthdays: | |
- :name: Gma | |
:date: 01/01/2021 | |
- :name: Tom | |
:date: 02/01/2021 | |
- :name: Sesame | |
:date: 03/01/2021 |
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Thank you for the great blog!
I found the typo.
In order for the program to work correctly, there needs to be a line break on the next line after
Location: /show/birthdays
which is on line 77.Best regards,
s4na