Re: [Scribeserver-users] Problems (and solutions :) ) while using Scribe with Ruby

[Chandranshu . <cha...@gm...>]

Resending in plain text format:
I'm  trying to use a Ruby Client named rscribe_cat.rb to post messages
to the scribed server started using the examples/example1.conf file
that came with the distribution. The file is attached herewith.

I'm summarizing the problems I faced in setting up Scribe for Ruby:

   1. Edit the <SCRIBE_BASE>/src/Makefile.in. Replace the following line

      $(eval $(call thrift_template,.,$(srcdir)/../if/scribe.thrift,
-I $(thrift_home)/share/ -I $(fb303_home)/share/ --cpp --py --php))

      with

      $(eval $(call thrift_template,.,$(srcdir)/../if/scribe.thrift,
-I $(thrift_home)/share/ -I $(fb303_home)/share/ --cpp --py --php
--gen rb))

   2. Now run the following command from <SCRIBE_BASE> again:

      sudo make install

      Verify that a gen_rb folder has been created in the
<SCRIBE_BASE>/src directory and it contains the scribe.rb file. This
file contains the ruby module that'll enable us to use it from inside
ruby code. Also, add this path to $: in your Ruby Client.
   3. However, the generated module contains the module name as scribe
and trying to use it will result in Ruby complaining that

      ../src/gen-rb/scribe.rb:12: class/module name must be CONSTANT
(SyntaxError)

      The leading ".." is because I was writing the ruby client in the
examples directory. Open the "../src/gen-rb/scribe.rb" file and change
the module name to be Scribe with a capital 'S'.
   4. The next error you'll get is:

        ../src/gen-rb/scribe.rb:9:in `require': no such file to load
-- FacebookService (LoadError)

      This is because when installing fb303, ruby classes were left
out again. Generate the ruby classes for the fb303 service interface
from the <FB303_BASE> directory:

        sudo thrift -o /usr/local/share -I /usr/local/share  --gen rb
if/fb303.thrift

      Unfortunately, ruby files in /usr/local/share are not picked up
Ruby by default. So, you'll have to manually copy over the files to
/usr/local/lib/site_ruby/1.8/ or the corresponding directory on your
machine.
   5. The next error is the one that consumed most of my time:

      /usr/local/lib/site_ruby/1.8/fb303_types.rb:8:in `require': no
such file to load --
/usr/local/lib/site_ruby/1.8/reflection_limited_types

      Looking at the code, I found that it was using
File.dirname(FILE) to load the reflection_limited_types file. Bad for
me. After a huge updatedb call, I was able to locate the corresponding
thrift file. Use the following to remedy this:

      sudo thrift -o /usr/local/lib/site_ruby/1.8 --gen rb
/usr/local/share/thrift/if/reflection_limited.thrift

      and then copy out the files from the gen-rb directory to the
/usr/local/lib/site_ruby/1.8 directory. After this point, you
shouldn't get any more syntax errors. Though it'd be great if the ruby
classes are also generated at the build time for Thrift, fb303 and
scribe. I think generating the ruby classes for the
thrift/if/reflection_limited.thrift, <fb303_base>/if/fb303.thrift and
$(srcdir)/../if/scribe.thrift files and putting them in the right
place should do.
   6. What I'm still struggling with:

      /usr/local/lib/site_ruby/1.8/thrift/protocol/binaryprotocol.rb:82:in
`read_message_begin': Missing version identifier
(Thrift::ProtocolException)
              from /usr/local/lib/site_ruby/1.8/thrift/client.rb:26:in
`receive_message'

              from ../src/gen-rb/scribe.rb:26:in `recv_Log'
              from ../src/gen-rb/scribe.rb:18:in `Log'
              from rscribe_cat:18

If someone has solved this problem or if the developers can guide me
as to what might be going wrong, I'll try and fix it and post a patch.

Anyways, good framework Guys!!

Thanks and regards,
Chandranshu