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Original file line number | Diff line number | Diff line change |
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defmodule LambdaEthereumConsensus.Store.Blocks do | ||
@moduledoc false | ||
alias LambdaEthereumConsensus.Store.BlockStore | ||
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use GenServer | ||
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@ets_block_by_hash __MODULE__ | ||
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########################## | ||
### Public API | ||
########################## | ||
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def start_link(_opts) do | ||
GenServer.start_link(__MODULE__, [], name: __MODULE__) | ||
end | ||
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def store_block(block_root, signed_block) do | ||
cache_block(block_root, signed_block) | ||
GenServer.cast(__MODULE__, {:store_block, block_root, signed_block}) | ||
end | ||
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def get_block(block_root), do: lookup(block_root) | ||
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@spec clear() :: any() | ||
def clear, do: :ets.delete_all_objects(@ets_block_by_hash) | ||
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########################## | ||
### GenServer Callbacks | ||
########################## | ||
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@impl GenServer | ||
def init(_) do | ||
:ets.new(@ets_block_by_hash, [:set, :public, :named_table]) | ||
{:ok, nil} | ||
end | ||
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@impl GenServer | ||
def handle_cast({:store_block, block_root, signed_block}, state) do | ||
BlockStore.store_block(signed_block, block_root) | ||
# TODO: remove old blocks from cache | ||
{:noreply, state} | ||
end | ||
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########################## | ||
### Private Functions | ||
########################## | ||
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defp lookup(block_root) do | ||
case :ets.lookup_element(@ets_block_by_hash, block_root, 2, nil) do | ||
nil -> cache_miss(block_root) | ||
block -> block | ||
end | ||
end | ||
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defp cache_miss(block_root) do | ||
case fetch_block(block_root) do | ||
nil -> nil | ||
block -> cache_block(block_root, block) | ||
end | ||
end | ||
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defp fetch_block(block_root) do | ||
case BlockStore.get_block(block_root) do | ||
{:ok, signed_block} -> signed_block | ||
:not_found -> nil | ||
# TODO: handle this somehow? | ||
{:error, error} -> raise "database error #{inspect(error)}" | ||
end | ||
end | ||
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defp cache_block(block_root, signed_block) do | ||
:ets.insert_new(@ets_block_by_hash, {block_root, signed_block}) | ||
signed_block | ||
end | ||
end |
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