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a simple key value store otp application for elixir sample

feature:

  • on memory kvs.
  • robust (auto restart on crash, but keep table).
  • multi client.

require: elixir-0.6.0 or later building: $ mix compile

running: $ mix iex

running demo:

iex(1)> :application.start(:sasl)

=PROGRESS REPORT==== 13-Sep-2012::23:51:09 === supervisor: {local,sasl_safe_sup} started: [{pid,<0.47.0>}, {name,alarm_handler}, {mfargs,{alarm_handler,start_link,[]}}, {restart_type,permanent}, {shutdown,2000}, {child_type,worker}]

=PROGRESS REPORT==== 13-Sep-2012::23:51:09 === supervisor: {local,sasl_safe_sup} started: [{pid,<0.48.0>}, {name,overload}, {mfargs,{overload,start_link,[]}}, {restart_type,permanent}, {shutdown,2000}, {child_type,worker}]

=PROGRESS REPORT==== 13-Sep-2012::23:51:09 === supervisor: {local,sasl_sup} started: [{pid,<0.46.0>}, {name,sasl_safe_sup}, {mfargs, {supervisor,start_link, [{local,sasl_safe_sup},sasl,safe]}}, {restart_type,permanent}, {shutdown,infinity}, {child_type,supervisor}]

=PROGRESS REPORT==== 13-Sep-2012::23:51:09 === supervisor: {local,sasl_sup} started: [{pid,<0.49.0>}, {name,release_handler}, {mfargs,{release_handler,start_link,[]}}, {restart_type,permanent}, {shutdown,2000}, {child_type,worker}]

=PROGRESS REPORT==== 13-Sep-2012::23:51:09 === application: sasl started_at: nonode@nohost :ok iex(2)> :application.start(:kvs) :ok iex(3)> =PROGRESS REPORT==== 13-Sep-2012::23:51:13 === application: kvs started_at: nonode@nohost

nil iex(4)> Kvs.Sup.connect(:kvs_sup, :c1)

=INFO REPORT==== 13-Sep-2012::23:52:56 === Kvs.Server started: 8211

=PROGRESS REPORT==== 13-Sep-2012::23:52:56 === supervisor: {<0.55.0>,'Elixir-Kvs-Srv-Sup'} started: [{pid,<0.56.0>}, {name,c1}, {mfargs,{'Elixir-Kvs-Server',start_link,[c1,8211]}}, {restart_type,permanent}, {shutdown,100000}, {child_type,worker}]

=PROGRESS REPORT==== 13-Sep-2012::23:52:56 === supervisor: {local,kvs_sup} started: [{pid,<0.55.0>}, {name,c1}, {mfargs,{'Elixir-Kvs-Srv-Sup',start_link,[c1]}}, {restart_type,temporary}, {shutdown,10000}, {child_type,supervisor}] {:ok,<0.55.0>} iex(5)> :gen_server.call(:c1, {:put, :a, :b}) :b iex(6)> :gen_server.call(:c1, {:put, :a2, :b2}) :b2 iex(7)> :gen_server.call(:c1, {:put, :a3, :b4}) :b4 iex(8)> :gen_server.call(:c1, {:get, :a2})
:b2 iex(9)> :gen_server.call(:c1, {:get, :a1}) nil iex(10)> :gen_server.call(:c1, {:get, :a}) :b iex(11)> :gen_server.call(:c1, {:keys})
[:a3,:a2,:a] iex(12)> :gen_server.call(:c1, {:badrequest})

=ERROR REPORT==== 13-Sep-2012::23:54:20 === Kvs.Server crashed: {:function_clause,[{Kvs.Server,:handle_call,[{:badrequest},{<0.41.0>,#Ref<0.0.0.220>},8211],[{:file,'/Users/k-1/work/erl/elixir_doc/proj/kvs/lib/kvs_server.ex'},{:line,10}]},{:gen_server,:handle_msg,5,[{:file,'gen_server.erl'},{:line,588}]},{:proc_lib,:init_p_do_apply,3,[{:file,'proc_lib.erl'},{:line,227}]}]}

=ERROR REPORT==== 13-Sep-2012::23:54:20 === Kvs.Server snapshot: 8211

=ERROR REPORT==== 13-Sep-2012::23:54:20 === ** Generic server c1 terminating ** Last message in was {badrequest} ** When Server state == 8211 ** Reason for termination == ** {function_clause, [{'Elixir-Kvs-Server',handle_call, [{badrequest},{<0.41.0>,#Ref<0.0.0.220>},8211], [{file, "/Users/k-1/work/erl/elixir_doc/proj/kvs/lib/kvs_server.ex"}, {line,10}]}, {gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,588}]}, {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,227}]}]} ** (exit) {{:function_clause,[{Kvs.Server,:handle_call,[{:badrequest},{<0.41.0>,#Ref<0.0.0.220>},8211],[{:file,'/Users/k-1/work/erl/elixir_doc/proj/kvs/lib/kvs_server.ex'},{:line,10}]},{:gen_server,:handle_msg,5,[{:file,'gen_server.erl'},{:line,588}]},{:proc_lib,:init_p_do_apply,3,[{:file,'proc_lib.erl'},{:line,227}]}]},{:gen_server,:call,[:c1,{:badrequest}]}}

=CRASH REPORT==== 13-Sep-2012::23:54:20 === crasher: initial call: Elixir-Kvs-Server:init/1 pid: <0.56.0> registered_name: c1 exception exit: {function_clause, [{'Elixir-Kvs-Server',handle_call, [{badrequest},{<0.41.0>,#Ref<0.0.0.220>},8211], [{file, "/Users/k-1/work/erl/elixir_doc/proj/kvs/lib/kvs_server.ex"}, {line,10}]}, {gen_server,handle_msg,5, [{file,"gen_server.erl"},{line,588}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,227}]}]} in function gen_server:terminate/6 (gen_server.erl, line 747) ancestors: [<0.55.0>,kvs_sup,<0.53.0>] messages: [] links: [<0.55.0>] dictionary: [] trap_exit: false status: running heap_size: 4181 stack_size: 24 reductions: 3318 neighbours:

=SUPERVISOR REPORT==== 13-Sep-2012::23:54:20 === Supervisor: {<0.55.0>,'Elixir-Kvs-Srv-Sup'} Context: child_terminated Reason: {function_clause, [{'Elixir-Kvs-Server',handle_call, [{badrequest},{<0.41.0>,#Ref<0.0.0.220>},8211], [{file, "/Users/k-1/work/erl/elixir_doc/proj/kvs/lib/kvs_server.ex"}, {line,10}]}, {gen_server,handle_msg,5, [{file,"gen_server.erl"},{line,588}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,227}]}]} Offender: [{pid,<0.56.0>}, {name,c1}, {mfargs,{'Elixir-Kvs-Server',start_link,[c1,8211]}}, {restart_type,permanent}, {shutdown,100000}, {child_type,worker}]

=INFO REPORT==== 13-Sep-2012::23:54:20 === Kvs.Server started: 8211

=PROGRESS REPORT==== 13-Sep-2012::23:54:20 === supervisor: {<0.55.0>,'Elixir-Kvs-Srv-Sup'} started: [{pid,<0.57.0>}, {name,c1}, {mfargs,{'Elixir-Kvs-Server',start_link,[c1,8211]}}, {restart_type,permanent}, {shutdown,100000}, {child_type,worker}] Binary.Inspect.Kvs.Server.inspect({Kvs.Server,:handle_call,[{:badrequest},{<0.41.0>,#Ref<0.0.0.220>},8211],[{:file,'/Users/k-1/work/erl/elixir_doc/proj/kvs/lib/kvs_server.ex'},{:line,10}]}) /Users/k-1/work/erl/elixir_doc/material/elixir/lib/elixir/lib/binary/inspect.ex:15: Binary.Inspect.inspect/1 /Users/k-1/work/erl/elixir_doc/material/elixir/lib/elixir/lib/binary/inspect.ex:174: Binary.Inspect.List.container_join/3 /Users/k-1/work/erl/elixir_doc/material/elixir/lib/elixir/lib/binary/inspect.ex:170: Binary.Inspect.List.container_join/3 /Users/k-1/work/erl/elixir_doc/material/elixir/lib/elixir/lib/binary/inspect.ex:174: Binary.Inspect.List.container_join/3 /Users/k-1/work/erl/elixir_doc/material/elixir/lib/elixir/lib/iex.ex:172: IEx.do_loop/1

iex(12)> :gen_server.call(:c1, {:keys})
[:a3,:a2,:a] iex(14)> Kvs.Sup.connect(:kvs_sup, :c2) {:ok,<0.58.0>} iex(15)> =INFO REPORT==== 13-Sep-2012::23:56:14 === Kvs.Server started: 12306

=PROGRESS REPORT==== 13-Sep-2012::23:56:14 === supervisor: {<0.58.0>,'Elixir-Kvs-Srv-Sup'} started: [{pid,<0.59.0>}, {name,c2}, {mfargs,{'Elixir-Kvs-Server',start_link,[c2,12306]}}, {restart_type,permanent}, {shutdown,100000}, {child_type,worker}]

=PROGRESS REPORT==== 13-Sep-2012::23:56:14 === supervisor: {local,kvs_sup} started: [{pid,<0.58.0>}, {name,c2}, {mfargs,{'Elixir-Kvs-Srv-Sup',start_link,[c2]}}, {restart_type,temporary}, {shutdown,10000}, {child_type,supervisor}]

nil iex(16)> :gen_server.call(:c2, {:get, :a}) nil iex(17)> :gen_server.call(:c1, {:get, :a}) :b