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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/tasks/init.ex
defmodule EventStore.Tasks.Init do
@moduledoc """
Task to initalize the EventStore database
"""
import EventStore.Tasks.Output
alias EventStore.Storage.Initializer
@is_events_table_exists """
SELECT EXISTS (
SELECT 1
FROM information_schema.tables
WHERE table_schema = 'public'
AND table_name = 'events'
)
"""
@doc """
Runs task
## Parameters
- config: the parsed EventStore config
## Opts
- is_mix: set to `true` if running as part of a Mix task
- quiet: set to `true` to silence output
"""
def exec(event_store, config, opts) do
opts = Keyword.merge([is_mix: false, quiet: false], opts)
{:ok, conn} = Postgrex.start_link(config)
case run_query!(conn, @is_events_table_exists) do
%{rows: [[true]]} ->
write_info("The EventStore database has already been initialized.", opts)
%{rows: [[false]]} ->
Initializer.run!(event_store, config, conn)
write_info("The EventStore database has been initialized.", opts)
end
true = Process.unlink(conn)
true = Process.exit(conn, :shutdown)
:ok
end
defp run_query!(conn, query) do
Postgrex.query!(conn, query, [])
end
end