@lodestar/prover/lib/cli/applyPreset.js

A Typescript implementation of the Ethereum Consensus light client

// MUST import this file first before anything and not import any Lodestar code.
import { setHasher } from "@chainsafe/persistent-merkle-tree";
import { hasher as asSha256Hasher } from "@chainsafe/persistent-merkle-tree/hasher/as-sha256";
import { hasher as hashtreeHasher } from "@chainsafe/persistent-merkle-tree/hasher/hashtree";
import CpuFeatures from "cpu-features";
// without setting this first, persistent-merkle-tree will use noble instead
const cpuFeatures = CpuFeatures();
if (cpuFeatures.arch === "x86" &&
    !((cpuFeatures.flags.avx512f && cpuFeatures.flags.avx512vl) ||
        (cpuFeatures.flags.avx2 && cpuFeatures.flags.bmi2) ||
        (cpuFeatures.flags.avx && cpuFeatures.flags.sha))) {
    setHasher(asSha256Hasher);
}
else {
    setHasher(hashtreeHasher);
}
//
// ## Rationale
//
// Lodestar implemented PRESET / CONFIG separation to allow importing types and preset constants directly
// see https://github.com/ChainSafe/lodestar/pull/2585
//
// However this prevents dynamic configuration changes which is exactly what the CLI required before.
// - The dev command can't apply the minimal preset dynamically
// - `--network gnosis` can't apply a different preset dynamically
// - `--network chiado` can't apply a different preset dynamically
//
// Running this file allows us to keep a static export strategy while NOT requiring users to
// set LODESTAR_PRESET manually every time.
// IMPORTANT: only import Lodestar code here which does not import any other Lodestar libraries
import { PresetName, presetFromJson, setActivePreset } from "@lodestar/params/setPreset";
import { readFile } from "../utils/file.js";
const network = valueOfArg("network");
const preset = valueOfArg("preset");
const presetFile = valueOfArg("presetFile");
// Apply preset flag if present
if (preset) {
    process.env.LODESTAR_PRESET = preset;
}
// If ENV is set overrides, network (otherwise can not override network --dev in mainnet mode)
else if (process.env.LODESTAR_PRESET) {
    // break
}
// Translate network to preset
else if (network) {
    if (network === "dev") {
        process.env.LODESTAR_PRESET = "minimal";
        // the kzg library has hardcoded the mainnet value, do not use presets
        setActivePreset(PresetName.minimal, { FIELD_ELEMENTS_PER_BLOB: 4096 });
    }
    else if (network === "gnosis" || network === "chiado") {
        process.env.LODESTAR_PRESET = "gnosis";
    }
}
if (presetFile) {
    // Override the active preset with custom values from file
    // Do not modify the preset to use as a base by passing null
    setActivePreset(null, presetFromJson(readFile(presetFile) ?? {}));
}
/**
 * Valid syntax
 * - `--preset minimal`
 * - `--preset=minimal`
 */
function valueOfArg(argName) {
    // Syntax `--preset minimal`
    // process.argv = ["--preset", "minimal"];
    {
        const index = process.argv.indexOf(`--${argName}`);
        if (index > -1) {
            return process.argv[index + 1] ?? "";
        }
    }
    // Syntax `--preset=minimal`
    {
        const prefix = `--${argName}=`;
        const item = process.argv.find((arg) => arg.startsWith(prefix));
        if (item) {
            return item.slice(prefix.length);
        }
    }
    return null;
}
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