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