No matching function Bank.Account.apply_event/2

[homanchou]

I'm not sure what causes this error. Sometimes I get it, sometimes I don't. It seems to happen after the terminal has been open for a while... as if it's related to time.

Erlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Interactive Elixir (1.2.4) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)>
nil
iex(2)>
nil
iex(3)>
nil
iex(4)>
nil
iex(5)>
nil
iex(6)> Bank.__info__(:functions)
[check_balance: 1, close: 0, create: 1, deposit: 2, open: 0, withdraw: 2]
iex(7)> Bank.open
{:ok, #PID<0.93.0>}
iex(8)> Bank.create "w"
Command Sent
Command Handler: Create Account
:ok
Event Store Published Event
Event Published
Event Handler: Account Created
Account Created
iex(9)> Bank.deposit "w" 100
** (SyntaxError) iex:9: syntax error before: 100

iex(9)> Bank.deposit "w", 100
Command Sent
Command Handler: Deposit Money
:ok
Event Store Published Event
Event Published
Event Handler: Money Deposited
Money Deposited
iex(10)> Bank.withdraw "w", 200
Command Sent
Command Handler: Withdraw Money
:ok
-100
Event Store Published Event
Event Published
Event Handler: Payment Declined
iex(11)>
13:14:57.956 [info]  Payment declined for Account: "w". Shame, shame!

iex(11)> Bank.deposit "w", 50
Command Sent
Command Handler: Deposit Money
:ok
Event Store Published Event
Event Published
Event Handler: Money Deposited
Money Deposited
iex(12)> Bank.deposit "w", -50
Command Sent
Command Handler: Deposit Money
:ok
Event Store Published Event
Event Published
Event Handler: Money Deposited
Money Deposited
iex(13)> Bank.check_balance
** (UndefinedFunctionError) undefined function Bank.check_balance/0
    (elixir_cqrs_es) Bank.check_balance()
iex(13)> Bank.deposit "w", 50
Command Sent
Command Handler: Deposit Money
:ok
Event Store Published Event
Event Published
Event Handler: Money Deposited
Money Deposited
iex(14)> Bank.check_balance "w"
150
iex(15)> Bank.deposit "w", 50
Command Sent
Command Handler: Deposit Money
:ok
Event Store Published Event
Event Published
Event Handler: Money Deposited
Money Deposited
iex(16)> Bank.check_balance "w"
200
iex(17)> Bank.deposit "w" 100
** (SyntaxError) iex:17: syntax error before: 100

iex(17)> Bank.deposit "w", 100
Command Sent
Command Handler: Deposit Money
:ok
iex(18)>
13:16:52.647 [error] Process #PID<0.119.0> raised an exception
** (FunctionClauseError) no function clause matching in Bank.Account.apply_event/2
    (elixir_cqrs_es) lib/bank/account.ex:116: Bank.Account.apply_event({:transaction_date, {{2016, 6, 11}, {13, 15, 36}}}, %Bank.Account.State{balance: 0, changes: [], date_created: nil, id: nil})
    (elixir_cqrs_es) lib/bank/account.ex:140: Bank.Account.apply_many_events/2
    (elixir_cqrs_es) lib/bank/account.ex:70: Bank.Account.loop/1

[homanchou]

Erlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Interactive Elixir (1.2.4) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :os.system_time(:milli_seconds)
1465676397801
iex(2)> Bank.open
{:ok, #PID<0.88.0>}
iex(3)> Bnak.create "w"
** (UndefinedFunctionError) undefined function Bnak.create/1 (module Bnak is not available)
    Bnak.create("w")
iex(3)> Bank.create "w"
Command Sent
Command Handler: Create Account
:ok
Event Store Published Event
Event Published
Event Handler: Account Created
Account Created
iex(4)> :os.system_time(:milli_seconds)
1465676423151
iex(5)> Bank.deposit "w", 5
Command Sent
Command Handler: Deposit Money
:ok
iex(6)>
13:24:13.825 [error] Process #PID<0.99.0> raised an exception
** (FunctionClauseError) no function clause matching in Bank.Account.apply_event/2
    (elixir_cqrs_es) lib/bank/account.ex:116: Bank.Account.apply_event({:id, "w"}, %Bank.Account.State{balance: 0, changes: [], date_created: nil, id: nil})
    (elixir_cqrs_es) lib/bank/account.ex:140: Bank.Account.apply_many_events/2
    (elixir_cqrs_es) lib/bank/account.ex:70: Bank.Account.loop/1

nil
iex(7)> :os.system_time(:milli_seconds)
1465676657263
iex(8)>

[jfis]

in case anyone runs into this...

in Event Store

def append_events(key, events) do
  stored_events = get_raw_events(key)
  new_events = :lists.reverse(events)
  combined_events = new_events ++ stored_events

  :ets.insert(@table_id, {key, combined_events})

  for e <- new_events do
    IO.puts "Event Store Published Event"
    EventBus.publish_event(e)
  end
end

[homanchou]

I think the culprit is that when a bank account is opened it spawns a new process that executes a loop in account.ex. But this loop has a timeout after 10 seconds and it isn't monitored.