PaperTiger.Store.Topups (PaperTiger v1.5.1)

ETS-backed storage for Top-up resources.

Uses the shared store pattern via use PaperTiger.Store which provides:

GenServer wraps ETS table
Reads go directly to ETS (concurrent, fast)
Writes go through GenServer (serialized, safe)

Architecture

ETS Table: :paper_tiger_topups (public, read_concurrency: true)
GenServer: Serializes writes, handles initialization
Shared Implementation: All CRUD operations via PaperTiger.Store

Examples

# Direct read (no GenServer bottleneck)
{:ok, topup} = PaperTiger.Store.Topups.get("tu_123")

# Serialized write
topup = %{id: "tu_123", status: "pending", ...}
{:ok, topup} = PaperTiger.Store.Topups.insert(topup)

# Query helpers (direct ETS access)
topups = PaperTiger.Store.Topups.find_by(:status, "succeeded")

Summary

Functions

child_spec(init_arg)

Returns a specification to start this module under a supervisor.

clear()

Clears all topups from the store (all namespaces).

clear_namespace(namespace)

Clears all topups for a specific namespace.

count()

Counts total topups in current namespace.

delete(id)

Deletes a topup from the store.

find_by(field, value)

Finds all topups in the current namespace whose field equals value.

find_by_status(value) deprecated

get(id)

Retrieves a topup by ID.

get_owned(id, owner_field, owner_id)

Retrieves a topup only when it belongs to the given owner.

insert(item)

Inserts a topup into the store.

list(opts \\ %{})

Lists all topups with optional pagination.

list_namespace(namespace)

Returns all items in a specific namespace.

mutate_owned(owner_field, owner_id, operations)

Validates and applies child-resource mutations in one serialized store call.

namespaces()

Lists every storage namespace that currently holds topups.

prefix()

Returns the ID prefix for this resource.

start_link(opts \\ [])

Starts the topup store GenServer.

table_name()

Returns the ETS table name for this store.

update(item)

Updates a topup in the store.

Functions

child_spec(init_arg)

Returns a specification to start this module under a supervisor.

See Supervisor.

clear()

@spec clear() :: :ok

Clears all topups from the store (all namespaces).

Serialized write - goes through GenServer.

Useful for test cleanup. Note: This clears ALL data, not just the current namespace. For namespace-specific cleanup, use clear_namespace/1.

clear_namespace(namespace)

@spec clear_namespace(pid() | :global | {pid() | :global, String.t()}) :: :ok

Clears all topups for a specific namespace.

Used by PaperTiger.Test to clean up after each test.

count()

@spec count() :: non_neg_integer()

Counts total topups in current namespace.

Direct ETS access - does not go through GenServer.

delete(id)

@spec delete(String.t()) :: :ok

Deletes a topup from the store.

Serialized write - goes through GenServer. Data is scoped to the current test namespace.

find_by(field, value)

@spec find_by(atom(), term()) :: [map()]

Finds all topups in the current namespace whose field equals value.

Direct ETS access - does not go through GenServer. Returns an empty list when value is nil, since a nil reference never identifies a parent resource.

Examples

find_by(:customer, "cus_123")
find_by(:status, "active")

find_by_status(value)

This function is deprecated. Use find_by/2.

get(id)

@spec get(String.t()) :: {:ok, map()} | {:error, :not_found}

Retrieves a topup by ID.

Direct ETS access - does not go through GenServer. Data is scoped to the current test namespace.

get_owned(id, owner_field, owner_id)

@spec get_owned(String.t(), atom(), term()) :: {:ok, map()} | {:error, :not_found}

Retrieves a topup only when it belongs to the given owner.

Missing resources and resources owned by a different parent both return {:error, :not_found} so nested endpoints do not disclose foreign IDs.

insert(item)

@spec insert(map()) :: {:ok, map()}

Inserts a topup into the store.

Serialized write - goes through GenServer to prevent race conditions. Data is scoped to the current test namespace.

list(opts \\ %{})

@spec list(keyword() | map()) :: PaperTiger.List.t()

Lists all topups with optional pagination.

Direct ETS access - does not go through GenServer. Data is scoped to the current test namespace.

Options

:limit - Number of items (default: 10, max: 100)
:starting_after - Cursor for pagination
:ending_before - Reverse cursor

list_namespace(namespace)

@spec list_namespace(pid() | :global | {pid() | :global, String.t()}) :: [map()]

Returns all items in a specific namespace.

Useful for debugging test isolation.

mutate_owned(owner_field, owner_id, operations)

@spec mutate_owned(atom(), term(), [
  {:insert | :update, map()} | {:delete, String.t()}
]) ::
  :ok
  | {:error,
     {:already_exists | :duplicate_operation | :not_found | :not_owned,
      String.t()}}

Validates and applies child-resource mutations in one serialized store call.

Every operation is checked before any write occurs. Inserts must use new IDs, updates and deletes must target existing resources owned by owner_id, and an ID may appear only once in the batch.

namespaces()

@spec namespaces() :: [PaperTiger.Connect.storage_namespace()]

Lists every storage namespace that currently holds topups.

Direct ETS access - does not go through GenServer.

prefix()

@spec prefix() :: String.t() | nil

Returns the ID prefix for this resource.

start_link(opts \\ [])

@spec start_link(keyword()) :: GenServer.on_start()

Starts the topup store GenServer.

table_name()

@spec table_name() :: atom()

Returns the ETS table name for this store.

update(item)

@spec update(map()) :: {:ok, map()}

Updates a topup in the store.

Serialized write - goes through GenServer. Data is scoped to the current test namespace.