shhnwz / shorturl

erlang based shorturl generator application

shorturl

An OTP application for url shortening, developed in erlang and riak-kv as datastore.

Pre-requisites

• riak docker setup commands
  • Load and run riak-kv docker image

  docker run --name=riak -d -p 8087:8087 -p 8098:8098 basho/riak-kv
  

  • Login to riak container console for issuing admin commands.

  bash -c "clear && docker exec -it riak sh"
  

  • Create and activate CRDT bucket type

  #>riak-admin bucket-type create crdt_counter_type '{"props":{"datatype":"counter"}}'
  #>riak-admin bucket-type activate crdt_counter_type
  

Build

$ sh pre_compile.sh

$ rebar3 compile

Eunit

$ rebar3 eunit

Expected Compilation Issue/s (Even after executing pre_compile.sh)

Compiling _build/default/lib/riakc/src/riakc_pb_socket.erl failed _build/default/lib/riakc/src/riakc_pb_socket.erl:2384: call to crypto:rand_bytes/1 will fail, since it was removed in 20.0; use crypto:strong_rand_bytes/1

Fix

open rebar.config of riakc

vi _build/default/lib/riakc/rebar.config

change two lines as per 'riakc_erl20.diff' file

diff --git a/rebar.config b/rebar.config index 5fb1e7f..5c6394f 100644 --- a/rebar.config +++ b/rebar.config @@ -1,4 +1,4 @@ -{require_otp_vsn, "R15|R16|17|18|19"}. +{require_otp_vsn, "R15|R16|17|18|19|20"}.

{cover_enabled, true}.

@@ -9,7 +9,7 @@ warnings_as_errors, {platform_define, "^[0-9]+", namespaced_types}, {platform_define, "(?=^[0-9]+)(?!^17)", deprecated_now},

• {platform_define, "^19", deprecated_19}

• {platform_define, "^(19|20)", deprecated_19} ]}.

Starting the Application

In shell mode

$ rebar3 shell

Test Curl Commands

curl -X POST -d 'www.google.com'  http://localhost:8080/shorturl/generate_token

Output Token -> ChN7N1zDAA==

curl -X GET -d 'ChN7N1zDAA=='  http://localhost:8080/shorturl/redirect

Output URL -> www.google.com