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defmodule Plausible.Release do
@moduledoc """
Utility functions used by release scripts for routine tasks,
like migrations.
"""
use Plausible
use Plausible.Repo
@app :plausible
@start_apps [
:ssl,
:postgrex,
:ch,
:ecto
]
def should_be_first_launch? do
on_ee do
always(false)
else
not (_has_users? = Repo.exists?(Plausible.Auth.User))
end
end
@doc """
`interweave_migrate/0` is a migration function that:
- Lists all pending migrations across multiple repositories.
- Sorts these migrations into a single list.
- Groups consecutive migrations by repository into "streaks".
- Executes the migrations in the correct order by processing each streak sequentially.
### Why Use This Approach?
This function resolves dependencies between migrations that span across different repositories.
The default `migrate/0` function migrates each repository independently, which may result in
migrations running in the wrong order when there are cross-repository dependencies.
Consider the following example (adapted from reality, not 100% accurate):
- **Migration 1**: The PostgreSQL (PG) repository creates a table named `site_imports`.
- **Migration 2**: The ClickHouse (CH) repository creates `import_id` columns in `imported_*` tables.
- **Migration 3**: The PG repository runs a data migration that utilizes both PG and CH databases,
reading from the `import_id` column in `imported_*` tables.
The default `migrate/0` would execute these migrations by repository, resulting in the following order:
1. Migration 1 (PG)
2. Migration 3 (PG)
3. Migration 2 (CH)
This sequence would fail at Migration 3, as the `import_id` columns in the CH repository have not been created yet.
`interweave_migrate/0` addresses this issue by consolidating all pending migrations into a single, ordered queue:
1. Migration 1 (PG)
2. Migration 2 (CH)
3. Migration 3 (PG)
This ensures all dependencies are resolved in the correct order.
"""
def interweave_migrate(repos \\ repos()) do
prepare()
pending = all_pending_migrations(repos)
streaks = migration_streaks(pending)
Enum.each(streaks, fn {repo, up_to_version} ->
{:ok, _, _} =
Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :up, to: up_to_version),
log: :notice
)
end)
end
defp migration_streaks(pending_migrations) do
sorted_migrations =
pending_migrations
|> Enum.map(fn {repo, version, _name} -> {repo, version} end)
|> Enum.sort_by(fn {_repo, version} -> version end, :asc)
streaks_reversed =
Enum.reduce(sorted_migrations, [], fn {repo, _version} = latest_migration, streaks_acc ->
case streaks_acc do
# start the streak for repo
[] -> [latest_migration]
# extend the streak
[{^repo, _prev_version} | rest] -> [latest_migration | rest]
# end the streak for prev_repo, start the streak for repo
[{_prev_repo, _prev_version} | _rest] -> [latest_migration | streaks_acc]
end
end)
:lists.reverse(streaks_reversed)
end
@spec all_pending_migrations([Ecto.Repo.t()]) :: [{Ecto.Repo.t(), integer, String.t()}]
defp all_pending_migrations(repos) do
Enum.flat_map(repos, fn repo ->
# credo:disable-for-lines:6 Credo.Check.Refactor.Nesting
{:ok, pending, _started} =
Ecto.Migrator.with_repo(repo, fn repo ->
Ecto.Migrator.migrations(repo)
|> Enum.filter(fn {status, _version, _name} -> status == :down end)
|> Enum.map(fn {_status, version, name} -> {repo, version, name} end)
end)
pending
end)
end
def pending_streaks(repos \\ repos()) do
prepare()
IO.puts("Collecting pending migrations..")
pending = all_pending_migrations(repos)
if pending == [] do
IO.puts("No pending migrations!")
else
streaks = migration_streaks(pending)
print_migration_streaks(streaks, pending)
end
end
defp print_migration_streaks([{repo, up_to_version} | streaks], pending) do
{streak, pending} =
Enum.split_with(pending, fn {pending_repo, version, _name} ->
pending_repo == repo and version <= up_to_version
end)
IO.puts(
"\n#{inspect(repo)} [#{Path.relative_to_cwd(Ecto.Migrator.migrations_path(repo))}] streak up to version #{up_to_version}:"
)
Enum.each(streak, fn {_repo, version, name} -> IO.puts(" * #{version}_#{name}") end)
print_migration_streaks(streaks, pending)
end
defp print_migration_streaks([], []), do: :ok
def seed do
prepare()
# Run seed script
Enum.each(repos(), &run_seeds_for/1)
# Signal shutdown
IO.puts("Success!")
end
def createdb(repos \\ repos()) do
prepare()
for repo <- repos do
:ok = ensure_repo_created(repo)
end
IO.puts("Creation of Db successful!")
end
def rollback do
prepare()
get_step =
IO.gets("Enter the number of steps: ")
|> String.trim()
|> Integer.parse()
case get_step do
{int, _trailing} ->
Enum.each(repos(), fn repo -> run_rollbacks_for(repo, int) end)
IO.puts("Rollback successful!")
:error ->
IO.puts("Invalid integer")
end
end
def configure_ref_inspector() do
priv_dir = Application.app_dir(:plausible, "priv/ref_inspector")
Application.put_env(:ref_inspector, :database_path, priv_dir)
end
def configure_ua_inspector() do
priv_dir = Application.app_dir(:plausible, "priv/ua_inspector")
Application.put_env(:ua_inspector, :database_path, priv_dir)
end
def dump_plans() do
prepare()
Repo.delete_all("plans")
plans =
Plausible.Billing.Plans.all()
|> Plausible.Billing.Plans.with_prices()
|> Enum.map(fn plan ->
plan = Map.from_struct(plan)
monthly_cost = plan.monthly_cost && Money.to_decimal(plan.monthly_cost)
yearly_cost = plan.yearly_cost && Money.to_decimal(plan.yearly_cost)
features =
Enum.map(plan.features, fn f ->
{:ok, feat} = Plausible.Billing.Ecto.Feature.dump(f)
feat
end)
{:ok, team_member_limit} = Plausible.Billing.Ecto.Limit.dump(plan.team_member_limit)
plan
|> Map.drop([:id])
|> Map.put(:kind, Atom.to_string(plan.kind))
|> Map.put(:monthly_cost, monthly_cost)
|> Map.put(:yearly_cost, yearly_cost)
|> Map.put(:features, features)
|> Map.put(:team_member_limit, team_member_limit)
end)
{count, _} = Repo.insert_all("plans", plans)
IO.puts("Inserted #{count} plans")
end
##############################
defp repos do
Application.fetch_env!(@app, :ecto_repos)
end
defp run_seeds_for(repo) do
# Run the seed script if it exists
seed_script = seeds_path(repo)
if File.exists?(seed_script) do
IO.puts("Running seed script..")
Code.eval_file(seed_script)
end
end
defp ensure_repo_created(repo) do
config = repo.config()
adapter = repo.__adapter__()
case adapter.storage_status(config) do
:up ->
IO.puts("#{inspect(repo)} database already exists")
:ok
:down ->
IO.puts("Creating #{inspect(repo)} database..")
case adapter.storage_up(config) do
:ok -> :ok
{:error, :already_up} -> :ok
{:error, _reason} = error -> error
end
{:error, _reason} = error ->
error
end
end
defp run_rollbacks_for(repo, step) do
app = Keyword.get(repo.config(), :otp_app)
IO.puts("Running rollbacks for #{app} (STEP=#{step})")
{:ok, _, _} =
Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, all: false, step: step))
end
defp prepare do
IO.puts("Loading #{@app}..")
# Load the code for myapp, but don't start it
:ok = Application.ensure_loaded(@app)
IO.puts("Starting dependencies..")
# Start apps necessary for executing migrations
Enum.each(@start_apps, &Application.ensure_all_started/1)
# Start the Repo(s) for myapp
IO.puts("Starting repos..")
Enum.each(repos(), & &1.start_link(pool_size: 2))
end
defp seeds_path(repo), do: priv_path_for(repo, "seeds.exs")
defp priv_path_for(repo, filename) do
app = Keyword.get(repo.config(), :otp_app)
IO.puts("App: #{app}")
repo_underscore = repo |> Module.split() |> List.last() |> Macro.underscore()
Path.join([priv_dir(app), repo_underscore, filename])
end
defp priv_dir(app), do: "#{:code.priv_dir(app)}"
end