Add Brotli decompression to Indexer.Fetcher.Optimism.TxnBatch (#10410)

* Add Brotli decompression to Indexer.Fetcher.Optimism.TxnBatch

* Update spelling

---------

Co-authored-by: POA <33550681+poa@users.noreply.github.com>

apps/indexer/lib/indexer/fetcher/optimism/txn_batch.ex

@@ -47,6 +47,8 @@ defmodule Indexer.Fetcher.Optimism.TxnBatch do
   # Optimism chain block time is a constant (2 seconds)
   @op_chain_block_time 2
 
+  @compressor_brotli 1
+
   def child_spec(start_link_arguments) do
     spec = %{
       id: __MODULE__,
@@ -1097,15 +1099,20 @@ defmodule Indexer.Fetcher.Optimism.TxnBatch do
          genesis_block_l2,
          json_rpc_named_arguments_l2
        ) do
-    uncompressed_bytes = zlib_decompress(bytes)
+    uncompressed_bytes =
+      if first_byte(bytes) == @compressor_brotli do
+        {:ok, uncompressed} = :brotli.decode(binary_part(bytes, 1, byte_size(bytes) - 1))
+        uncompressed
+      else
+        zlib_decompress(bytes)
+      end
 
     batches =
       Enum.reduce_while(Stream.iterate(0, &(&1 + 1)), {uncompressed_bytes, []}, fn _i, {remainder, batch_acc} ->
         try do
           {decoded, new_remainder} = ExRLP.decode(remainder, stream: true)
 
-          <<version>> = binary_part(decoded, 0, 1)
+          <<version::size(8), content::binary>> = decoded
-          content = binary_part(decoded, 1, byte_size(decoded) - 1)
 
           new_batch_acc =
             cond do
@@ -1310,7 +1317,6 @@ defmodule Indexer.Fetcher.Optimism.TxnBatch do
         start_block = quantity_to_integer(Enum.at(responses, 0).result)
         "0x000000000000000000000000" <> batch_inbox = Enum.at(responses, 1).result
         "0x000000000000000000000000" <> batch_submitter = Enum.at(responses, 2).result
-
         {start_block, String.downcase("0x" <> batch_inbox), String.downcase("0x" <> batch_submitter)}
 
       _ ->

apps/indexer/mix.exs

@@ -51,6 +51,8 @@ defmodule Indexer.MixProject do
       {:decorator, "~> 1.4"},
       # JSONRPC access to Nethermind for `Explorer.Indexer`
       {:ethereum_jsonrpc, in_umbrella: true},
+      # Brotli compression/decompression
+      {:brotli, "~> 0.3.2"},
       # RLP encoding
       {:ex_rlp, "~> 0.6.0"},
       # Importing to database

cspell.json

@@ -61,6 +61,7 @@
         "blockscoutuser",
         "bools",
         "bridgedtokenlist",
+        "brotli",
         "browserconfig",
         "bsdr",
         "Btvk",

mix.lock

@@ -9,6 +9,7 @@
   "benchee": {:hex, :benchee, "1.3.1", "c786e6a76321121a44229dde3988fc772bca73ea75170a73fd5f4ddf1af95ccf", [:mix], [{:deep_merge, "~> 1.0", [hex: :deep_merge, repo: "hexpm", optional: false]}, {:statistex, "~> 1.0", [hex: :statistex, repo: "hexpm", optional: false]}, {:table, "~> 0.1.0", [hex: :table, repo: "hexpm", optional: true]}], "hexpm", "76224c58ea1d0391c8309a8ecbfe27d71062878f59bd41a390266bf4ac1cc56d"},
   "benchee_csv": {:hex, :benchee_csv, "1.0.0", "0b3b9223290bfcb8003552705bec9bcf1a89b4a83b70bd686e45295c264f3d16", [:mix], [{:benchee, ">= 0.99.0 and < 2.0.0", [hex: :benchee, repo: "hexpm", optional: false]}, {:csv, "~> 2.0", [hex: :csv, repo: "hexpm", optional: false]}], "hexpm", "cdefb804c021dcf7a99199492026584be9b5a21d6644ac0d01c81c5d97c520d5"},
   "briefly": {:git, "https://github.com/CargoSense/briefly.git", "4836ba322ffb504a102a15cc6e35d928ef97120e", []},
+  "brotli": {:hex, :brotli, "0.3.2", "59cf45a399098516f1d34f70d8e010e5c9bf326659d3ef34c7cc56793339002b", [:rebar3], [], "hexpm", "9ec3ef9c753f80d0c657b4905193c55e5198f169fa1d1c044d8601d4d931a2ad"},
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
   "bureaucrat": {:hex, :bureaucrat, "0.2.10", "b0de157dad540e40007b663b683f716ced21f85ff0591093aadb209ad0d967e1", [:mix], [{:inflex, ">= 1.10.0", [hex: :inflex, repo: "hexpm", optional: false]}, {:phoenix, ">= 1.2.0", [hex: :phoenix, repo: "hexpm", optional: true]}, {:plug, ">= 1.0.0", [hex: :plug, repo: "hexpm", optional: false]}, {:poison, "~> 1.5 or ~> 2.0 or ~> 3.0 or ~> 4.0 or ~> 5.0", [hex: :poison, repo: "hexpm", optional: true]}], "hexpm", "bc7e5162b911c29c8ebefee87a2c16fbf13821a58f448a8fd024eb6c17fae15c"},
   "bypass": {:hex, :bypass, "2.1.0", "909782781bf8e20ee86a9cabde36b259d44af8b9f38756173e8f5e2e1fabb9b1", [:mix], [{:plug, "~> 1.7", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.0", [hex: :plug_cowboy, repo: "hexpm", optional: false]}, {:ranch, "~> 1.3", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "d9b5df8fa5b7a6efa08384e9bbecfe4ce61c77d28a4282f79e02f1ef78d96b80"},