Opencouch

Discover opencouch, open couchdb to your #Erlang applications. Lightning Talk given at the Erlang Factory 2014

Transcript

1. Benoit Chesneau @benoitc
   Erlang Factory San Francisco - 2014-03-06
   opencouch
   http://enki-multimedia.org
   

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2. open couchdb to other

   Erlang applications
   

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3. • wanted an easy way to extend Apache
   CouchDB
   • Embed couchdb in a refuge [1]
   application
   Legacy
   [1] http://refuge.io
   

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5. • Started with rcouch [1]
   • Build Apache CouchDB as an Erlang/OTP
   release
   • Allows someone to embed rcouch in its
   own application: couch_core
   Legacy
   [1] http://github.com/refuge/rcouch
   

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6. $ git clone https://github.com/refuge/rcouch.git!
   $ cd rcouch!
   $ make && make rel!
   $ ./rel/rcouch/bin/rcouch console!
   ….!
   [<0.49.0>] [notice] Changed loglevel of ./log/couch.log to info!
   [<0.160.0>] [info] HTTP API started on "http://0.0.0.0:5984/"!
   Eshell V5.10.4 (abort with ^G)!
   $
   rcouch in action…
   

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7. • still an ini
   • lot of useless applications
   • want something simpler: opencouch [1]
   But…
   [1] http://github.com/refuge/opencouch
   

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8. [open]couch
   

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9. • a full erlang application
   • Only application env (no config)
   • code fixes…
   • some refactoring
   • WIP…
   opencouch
   [1] http://github.com/refuge/opencouch
   

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10. 1> couch:start().!
    !
    {ok,[crypto,sasl,asn1,public_key,ssl,syntax_tools,compiler,!
    goldrush,lager,couch]}!
    !
    2> {ok, Db} = couch_server:create(<<"testdb">>, []).!
    {ok,{db,<0.97.0>,nil,<<"1394151778355726">>,<0.96.0>,!
    ….!
    open a database
    

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11. 3> Doc = couch_doc:from_json_obj({[{<<"_id">>, <<"a">>}]}).!
    {doc,<<"a">>,{0,[]},{[]},[],false,[]}!
    5> couch_db:update_doc(Db, Doc, []). !
    {ok,{1,!
    <<150,122,0,223,245,224,42,221,65,129,145,56,171,179,40,!
    77>>}}
    store a doc
    

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12. 4> {ok, Total} = couch_db:get_doc_count(Db).!
    {ok,0}!
    7> {ok, Db1} = couch_db:reopen(Db). !
    {ok,{db,<0.97.0>,nil,<<"1394151778355726">>,<0.96.0>,!
    #Ref<0.0.0.216>,!
    ….!
    5> {ok, Total1} = couch_db:get_doc_count(Db1).!
    {ok,1}!
    6> couch_db:enum_docs(Db1, fun(FullDocInfo, _OffsetReds, Acc) -> !
    6> io:format("full doc info: ~p~n", [FullDocInfo]), !
    6> {ok, Acc} !
    6> end, nil, []). !
    full doc info: {full_doc_info,<<"a">>,1,false,!
    [{1,!
    {<<150,122,0,223,245,224,42,221,65,129,145
    171,179,40,77>>,!
    {leaf,false,79,1,39},!
    []}}],!
    39}!
    {ok,1,nil}!
    doc has been stored
    

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13. what’s [next]?
    

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14. !
    • use human readable data structures
    • add the replication
    • horizontal scaling
    • …
    What’s next?
    

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15. Want to sponsor it?
    
    contact contact@enkim.eu
    

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