ethers-rs/crates/ethers-contract/ethers-contract-abigen/src/util.rs

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2020-05-26 18:57:59 +00:00
use ethers_types::Address;
2020-05-26 09:37:31 +00:00
use anyhow::{anyhow, Result};
use curl::easy::Easy;
use inflector::Inflector;
use proc_macro2::{Ident, Literal, Span, TokenStream};
use quote::quote;
use syn::Ident as SynIdent;
/// Expands a identifier string into an token.
pub fn ident(name: &str) -> Ident {
Ident::new(name, Span::call_site())
}
/// Expands an identifier string into a token and appending `_` if the
/// identifier is for a reserved keyword.
///
/// Parsing keywords like `self` can fail, in this case we add an underscore.
pub fn safe_ident(name: &str) -> Ident {
syn::parse_str::<SynIdent>(name).unwrap_or_else(|_| ident(&format!("{}_", name)))
}
/// Expands a positional identifier string that may be empty.
///
/// Note that this expands the parameter name with `safe_ident`, meaning that
/// identifiers that are reserved keywords get `_` appended to them.
pub fn expand_input_name(index: usize, name: &str) -> TokenStream {
let name_str = match name {
"" => format!("p{}", index),
n => n.to_snake_case(),
};
let name = safe_ident(&name_str);
quote! { #name }
}
/// Expands a doc string into an attribute token stream.
pub fn expand_doc(s: &str) -> TokenStream {
let doc = Literal::string(s);
quote! {
#[doc = #doc]
}
}
/// Parses the given address string
pub fn parse_address<S>(address_str: S) -> Result<Address>
where
S: AsRef<str>,
{
let address_str = address_str.as_ref();
if !address_str.starts_with("0x") {
return Err(anyhow!("address must start with '0x'"));
}
Ok(address_str[2..].parse()?)
}
/// Perform an HTTP GET request and return the contents of the response.
pub fn http_get(url: &str) -> Result<String> {
let mut buffer = Vec::new();
let mut handle = Easy::new();
handle.url(url)?;
{
let mut transfer = handle.transfer();
transfer.write_function(|data| {
buffer.extend_from_slice(data);
Ok(data.len())
})?;
transfer.perform()?;
}
let buffer = String::from_utf8(buffer)?;
Ok(buffer)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn input_name_to_ident_empty() {
assert_quote!(expand_input_name(0, ""), { p0 });
}
#[test]
fn input_name_to_ident_keyword() {
assert_quote!(expand_input_name(0, "self"), { self_ });
}
#[test]
fn input_name_to_ident_snake_case() {
assert_quote!(expand_input_name(0, "CamelCase1"), { camel_case_1 });
}
#[test]
fn parse_address_missing_prefix() {
if parse_address("0000000000000000000000000000000000000000").is_ok() {
panic!("parsing address not starting with 0x should fail");
}
}
#[test]
fn parse_address_address_too_short() {
if parse_address("0x00000000000000").is_ok() {
panic!("parsing address not starting with 0x should fail");
}
}
#[test]
fn parse_address_ok() {
let expected = Address::from([
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
]);
assert_eq!(
parse_address("0x000102030405060708090a0b0c0d0e0f10111213").unwrap(),
expected
);
}
}