cerc-io/lighthouse
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Allow specifying alternative url for deposit_contract (#2295)

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## Issue Addressed

None

## Proposed Changes

Adds support for downloading the deposit contract from a different location
by setting the environement variables `LIGHTHOUSE_DEPOSIT_CONTRACT_SPEC_URL`
and `LIGHTHOUSE_DEPOSIT_CONTRACT_TESTNET_URL`.

It also adds support to fetch the content from a local file:// URL.

This allows pre fetching to build in an environment without network access.

## Additional Info

Being able to build without network access is required to package the application for https://nixos.org/. But I imagine it might be useful for other distributions too.
This commit is contained in:
Pascal Bach 2021-04-16 06:47:34 +00:00
parent 2992ca66cd
commit c646d2f7a3
1 changed files with 56 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

91
common/deposit_contract/build.rs
View File

@ -3,6 +3,7 @@
//!
//! These files are required for some `include_bytes` calls used in this crate.
use reqwest::Url;
use serde_json::Value;
use sha2::{Digest, Sha256};
use std::env;
@ -26,10 +27,41 @@ const TESTNET_BYTECODE_CHECKSUM: &str =
"2b054e7d134e2d66566ba074c8a18a3a67841d67c8ef6175fc95f1639ee73a89";
fn spec_url() -> String {
format!("https://raw.githubusercontent.com/ethereum/eth2.0-specs/{}/deposit_contract/contracts/validator_registration.json", TAG)
env::var("LIGHTHOUSE_DEPOSIT_CONTRACT_SPEC_URL")
.unwrap_or(format!("https://raw.githubusercontent.com/ethereum/eth2.0-specs/{}/deposit_contract/contracts/validator_registration.json", TAG))
}
fn testnet_url() -> String {
format!("https://raw.githubusercontent.com/sigp/unsafe-eth2-deposit-contract/{}/unsafe_validator_registration.json", UNSAFE_TAG)
env::var("LIGHTHOUSE_DEPOSIT_CONTRACT_TESTNET_URL")
.unwrap_or(format!("https://raw.githubusercontent.com/sigp/unsafe-eth2-deposit-contract/{}/unsafe_validator_registration.json", UNSAFE_TAG))
}
fn read_contract_file_from_url(url: Url) -> Result<Value, String> {
if url.scheme() == "file" {
let path = url
.to_file_path()
.map_err(|e| format!("Unable to get file path from url: {:?}", e))?;
let file = File::open(path).map_err(|e| format!("Unable to open json file: {:?}", e))?;
let contract: Value = serde_json::from_reader(file)
.map_err(|e| format!("Unable to read from jeson file: {:?}", e))?;
Ok(contract)
} else {
match reqwest::blocking::get(url) {
Ok(response) => {
let contract: Value = response
.json()
.map_err(|e| format!("Respsonse is not a valid json {:?}", e))?;
Ok(contract)
}
Err(e) => {
return Err(format!(
"No abi file found. Failed to download from github: {:?}",
e
))
}
}
}
}
fn main() {
@ -69,50 +101,39 @@ pub fn download_deposit_contract(
) -> Result<(), String> {
let abi_file = abi_dir().join(format!("{}_{}", TAG, abi_file));
let bytecode_file = abi_dir().join(format!("{}_{}", TAG, bytecode_file));
let url = reqwest::Url::parse(url).map_err(|e| format!("Unable to parse url: {}", e))?;
if abi_file.exists() {
// Nothing to do.
} else {
match reqwest::blocking::get(url) {
Ok(response) => {
let mut abi_file = File::create(abi_file)
.map_err(|e| format!("Failed to create local abi file: {:?}", e))?;
let mut bytecode_file = File::create(bytecode_file)
.map_err(|e| format!("Failed to create local bytecode file: {:?}", e))?;
let contract = read_contract_file_from_url(url)?;
let contract: Value = response
.json()
.map_err(|e| format!("Respsonse is not a valid json {:?}", e))?;
let mut abi_file = File::create(abi_file)
.map_err(|e| format!("Failed to create local abi file: {:?}", e))?;
let mut bytecode_file = File::create(bytecode_file)
.map_err(|e| format!("Failed to create local bytecode file: {:?}", e))?;
let abi = contract
.get("abi")
.ok_or("Response does not contain key: abi")?
.to_string();
let abi = contract
.get("abi")
.ok_or("Response does not contain key: abi")?
.to_string();
verify_checksum(abi.as_bytes(), abi_checksum);
verify_checksum(abi.as_bytes(), abi_checksum);
abi_file
.write(abi.as_bytes())
.map_err(|e| format!("Failed to write http response to abi file: {:?}", e))?;
abi_file
.write(abi.as_bytes())
.map_err(|e| format!("Failed to write http response to abi file: {:?}", e))?;
let bytecode = contract
.get("bytecode")
.ok_or("Response does not contain key: bytecode")?
.to_string();
let bytecode = contract
.get("bytecode")
.ok_or("Response does not contain key: bytecode")?
.to_string();
verify_checksum(bytecode.as_bytes(), bytecode_checksum);
verify_checksum(bytecode.as_bytes(), bytecode_checksum);
bytecode_file.write(bytecode.as_bytes()).map_err(|e| {
format!("Failed to write http response to bytecode file: {:?}", e)
})?;
}
Err(e) => {
return Err(format!(
"No abi file found. Failed to download from github: {:?}",
e
))
}
}
bytecode_file
.write(bytecode.as_bytes())
.map_err(|e| format!("Failed to write http response to bytecode file: {:?}", e))?;
}
Ok(())