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Dual license under MIT/Apache 2 (#28) 

* fix: dual license MIT / Apache 2

* provider: add missing license
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Copyright (c) 2020 Georgios Konstantopoulos
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Copyright (c) 2020 Georgios Konstantopoulos
Permission is hereby granted, free of charge, to any
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IN CONNECTION WITH THE SOFTWARE O THE USE OR OTHER
DEALINGS IN THE SOFTWARE.R

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ethers-contract/Cargo.toml
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[package]
name = "ethers-contract"
license = "MIT OR Apache-2.0"
version = "0.1.0"
authors = ["Georgios Konstantopoulos <me@gakonst.com>"]
edition = "2018"

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ethers-core/Cargo.toml
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[package]
name = "ethers-core"
license = "MIT OR Apache-2.0"
version = "0.1.0"
authors = ["Georgios Konstantopoulos <me@gakonst.com>"]
edition = "2018"

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ethers-providers/Cargo.toml
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[package]
name = "ethers-providers"
license = "MIT OR Apache-2.0"
version = "0.1.0"
authors = ["Georgios Konstantopoulos <me@gakonst.com>"]
edition = "2018"

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use crate::{provider::ProviderError, JsonRpcClient};
use async_trait::async_trait;
use reqwest::{Client, Error as ReqwestError};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use std::{
fmt,
str::FromStr,
sync::atomic::{AtomicU64, Ordering},
};
use thiserror::Error;
use url::Url;
/// A low-level JSON-RPC Client over HTTP.
///
/// # Example
///
/// ```no_run
/// use ethers::{types::U64, providers::{JsonRpcClient, Http}};
/// use std::str::FromStr;
///
/// # async fn foo() -> Result<(), Box<dyn std::error::Error>> {
/// let provider = Http::from_str("http://localhost:8545")?;
/// let block_number: U64 = provider.request("eth_blockNumber", None::<()>).await?;
/// # Ok(())
/// # }
/// ```
#[derive(Debug)]
pub struct Provider {
id: AtomicU64,
client: Client,
url: Url,
}
#[derive(Error, Debug)]
/// Error thrown when sending an HTTP request
pub enum WsError {
/// Thrown if the request failed
#[error(transparent)]
ReqwestError(#[from] ReqwestError),
#[error(transparent)]
/// Thrown if the response could not be parsed
JsonRpcError(#[from] errors::JsonRpcError),
}
impl From<ClientError> for ProviderError {
fn from(src: ClientError) -> Self {
ProviderError::JsonRpcClientError(Box::new(src))
}
}
#[async_trait]
impl JsonRpcClient for Provider {
type Error = ClientError;
/// Sends a POST request with the provided method and the params serialized as JSON
/// over HTTP
async fn request<T: Serialize + Send + Sync, R: for<'a> Deserialize<'a>>(
&self,
method: &str,
params: T,
) -> Result<R, ClientError> {
let next_id = self.id.load(Ordering::SeqCst) + 1;
self.id.store(next_id, Ordering::SeqCst);
let payload = Request::new(next_id, method, params);
let res = self
.client
.post(self.url.as_ref())
.json(&payload)
.send()
.await?;
let res = res.json::<Response<R>>().await?;
Ok(res.data.into_result()?)
}
}
impl Provider {
/// Initializes a new HTTP Client
///
/// # Example
///
/// ```
/// use ethers::providers::Http;
/// use url::Url;
///
/// let url = Url::parse("http://localhost:8545").unwrap();
/// let provider = Http::new(url);
/// ```
pub fn new(url: impl Into<Url>) -> Self {
Self {
id: AtomicU64::new(0),
client: Client::new(),
url: url.into(),
}
}
}
impl FromStr for Provider {
type Err = url::ParseError;
fn from_str(src: &str) -> Result<Self, Self::Err> {
let url = Url::parse(src)?;
Ok(Provider::new(url))
}
}
impl Clone for Provider {
fn clone(&self) -> Self {
Self {
id: AtomicU64::new(0),
client: self.client.clone(),
url: self.url.clone(),
}
}
}
// leak private type w/o exposing it
mod errors {
use super::*;
#[derive(Serialize, Deserialize, Debug, Clone, Error)]
/// A JSON-RPC 2.0 error
pub struct JsonRpcError {
/// The error code
pub code: i64,
/// The error message
pub message: String,
/// Additional data
pub data: Option<Value>,
}
impl fmt::Display for JsonRpcError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"(code: {}, message: {}, data: {:?})",
self.code, self.message, self.data
)
}
}
}
#[derive(Serialize, Deserialize, Debug)]
/// A JSON-RPC request
struct Request<'a, T> {
id: u64,
jsonrpc: &'a str,
method: &'a str,
params: T,
}
impl<'a, T> Request<'a, T> {
/// Creates a new JSON RPC request
fn new(id: u64, method: &'a str, params: T) -> Self {
Self {
id,
jsonrpc: "2.0",
method,
params,
}
}
}
#[derive(Serialize, Deserialize, Debug, Clone)]
struct Response<T> {
id: u64,
jsonrpc: String,
#[serde(flatten)]
data: ResponseData<T>,
}
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(untagged)]
enum ResponseData<R> {
Error { error: errors::JsonRpcError },
Success { result: R },
}
impl<R> ResponseData<R> {
/// Consume response and return value
fn into_result(self) -> Result<R, errors::JsonRpcError> {
match self {
ResponseData::Success { result } => Ok(result),
ResponseData::Error { error } => Err(error),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn response() {
let response: Response<u64> =
serde_json::from_str(r#"{"jsonrpc": "2.0", "result": 19, "id": 1}"#).unwrap();
assert_eq!(response.id, 1);
assert_eq!(response.data.into_result().unwrap(), 19);
}
}

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ethers-signers/Cargo.toml
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[package]
name = "ethers-signers"
license = "MIT OR Apache-2.0"
version = "0.1.0"
authors = ["Georgios Konstantopoulos <me@gakonst.com>"]
edition = "2018"

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ethers/Cargo.toml
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name = "ethers"
version = "0.1.0"
authors = ["Georgios Konstantopoulos <me@gakonst.com>"]
license = "MIT OR Apache-2.0"
edition = "2018"
readme = "README.md"
documentation = "https://docs.rs/ethers"