From 90b31ca06ca7add7f3648f673853b2ff78e0b45c Mon Sep 17 00:00:00 2001
From: Martin Minkov <minkovlmartin@gmail.com>
Date: Tue, 15 Aug 2023 17:11:01 -0700
Subject: [PATCH] feat(consensus): add new config.ts file to handle consensus
 configuration

This new file includes a Config type and a readConfig function to read and parse the configuration from a file. It also includes helper functions to extract values from the configuration file and to generate the grace period end value. This change allows for more flexible and maintainable configuration handling.
---
 src/consensus/config.ts | 51 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/consensus/config.ts

diff --git a/src/consensus/config.ts b/src/consensus/config.ts
new file mode 100644
index 0000000..9eb46ce
--- /dev/null
+++ b/src/consensus/config.ts
@@ -0,0 +1,51 @@
+import fs from 'fs';
+export { Config, readConfig };
+
+type Config = {
+  k: number;
+  delta: number;
+  slotsPerEpoch: number;
+  slotsPerSubWindow: number;
+  subWindowsPerWindow: number;
+  blockWindowDuration: number;
+  gracePeriodEnd: number;
+};
+
+function extractValue(contents: string, key: string): number {
+  const regex = new RegExp(`\\[%%define ${key} (?:")?(\\d+)(?:")?\\]`);
+  const match = contents.match(regex);
+  if (!match) {
+    throw new Error(`Key ${key} not found in config file.`);
+  }
+  return parseInt(match[1], 10);
+}
+
+function genGracePeriodEnd(
+  slotsPerEpoch: number,
+  blockWindowDuration: number
+): number {
+  const numDays = 3;
+  const gracePeriodEnd = Math.min(
+    (numDays * 24 * 60 * 60 * 1000) / blockWindowDuration,
+    slotsPerEpoch
+  );
+  return gracePeriodEnd;
+}
+
+function readConfig(path: string): Config {
+  const contents = fs.readFileSync(path, 'utf8');
+
+  const blockWindowDuration = extractValue(contents, 'block_window_duration');
+  const slotsPerEpoch = extractValue(contents, 'slots_per_epoch');
+  const gracePeriodEnd = genGracePeriodEnd(slotsPerEpoch, blockWindowDuration);
+
+  return {
+    k: extractValue(contents, 'k'),
+    delta: extractValue(contents, 'delta'),
+    slotsPerEpoch,
+    slotsPerSubWindow: extractValue(contents, 'slots_per_sub_window'),
+    subWindowsPerWindow: extractValue(contents, 'sub_windows_per_window'),
+    blockWindowDuration,
+    gracePeriodEnd,
+  };
+}