From dc52650018a2b7f95d15058eefe380b403218663 Mon Sep 17 00:00:00 2001
From: Matthias Seitz <matthias.seitz@outlook.de>
Date: Tue, 25 Jul 2023 15:49:41 +0200
Subject: [PATCH] chore: add eip4844 constants (#3906)

---
 crates/primitives/src/constants/eip4844.rs    | 25 +++++++++++++++++++
 .../src/{constants.rs => constants/mod.rs}    |  3 +++
 2 files changed, 28 insertions(+)
 create mode 100644 crates/primitives/src/constants/eip4844.rs
 rename crates/primitives/src/{constants.rs => constants/mod.rs} (98%)

diff --git a/crates/primitives/src/constants/eip4844.rs b/crates/primitives/src/constants/eip4844.rs
new file mode 100644
index 0000000000..edeb3eee5d
--- /dev/null
+++ b/crates/primitives/src/constants/eip4844.rs
@@ -0,0 +1,25 @@
+//! [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844#parameters) protocol constants for shard Blob Transactions.
+
+/// Size a single field element in bytes.
+pub const FIELD_ELEMENT_BYTES: u64 = 32;
+
+/// How many field elements are stored in a single data blob.
+pub const FIELD_ELEMENTS_PER_BLOB: u64 = 4096;
+
+/// Gas consumption of a single data blob.
+pub const DATA_GAS_PER_BLOB: u64 = 131_072u64; // 32*4096 = 131072 == 2^17 == 0x20000
+
+/// Maximum data gas for data blobs in a single block.
+pub const MAX_DATA_GAS_PER_BLOCK: u64 = 786_432u64; // 0xC0000
+
+/// Target data gas for data blobs in a single block.
+pub const TARGET_DATA_GAS_PER_BLOCK: u64 = 393_216u64; // 0x60000
+
+/// Maximum number of data blobs in a single block.
+pub const MAX_BLOBS_PER_BLOCK: u64 = MAX_DATA_GAS_PER_BLOCK / DATA_GAS_PER_BLOB; // 786432 / 131072  = 6
+
+/// Target number of data blobs in a single block.
+pub const TARGET_BLOBS_PER_BLOCK: u64 = TARGET_DATA_GAS_PER_BLOCK / DATA_GAS_PER_BLOB; // 393216 / 131072 = 3
+
+/// Used to determine the price for next data blob
+pub const BLOB_GASPRICE_UPDATE_FRACTION: u64 = 3_338_477u64; // 3338477
diff --git a/crates/primitives/src/constants.rs b/crates/primitives/src/constants/mod.rs
similarity index 98%
rename from crates/primitives/src/constants.rs
rename to crates/primitives/src/constants/mod.rs
index c592204827..96c55cbbe1 100644
--- a/crates/primitives/src/constants.rs
+++ b/crates/primitives/src/constants/mod.rs
@@ -4,6 +4,9 @@ use crate::{H256, U256};
 use hex_literal::hex;
 use std::time::Duration;
 
+/// [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844#parameters) constants.
+pub mod eip4844;
+
 /// The client version: `reth/v{major}.{minor}.{patch}`
 pub const RETH_CLIENT_VERSION: &str = concat!("reth/v", env!("CARGO_PKG_VERSION"));