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feat(abigen): extend ethevent trait methods and decoding (#239) 

* feat: extend EthEvent with decode_log method and support indexed proc
macro attributes

* test: check that ethevent proc macro attributes compile

* docs: document EthEvent proc macro attributes and add example

* refactor: change decode_log to take a reference

* refactor: use ethers as fully qualified path

* feat: add events enum generation

* feat: introduce EthLogDecode trait

* feat: generate EthLogDecode implementations

* refactor: use fully qualified syntax during abigen

* fix: switch to new Event builder

* fix: make test compile again

* test: update failing tests

* refactor: rename event function

* chore(clippy): make clippy happy

* fix: rename the event correctly

* fix: add missing indexed attribute

* Revert "fix: rename the event correctly"

This reverts commit 03eabc3ead.

* fix: make indexed names optional

* fix: dsproxy name

* fix: rename ethers top level module imports
This commit is contained in:
Matthias Seitz 2021-03-19 16:44:59 +01:00 committed by GitHub
parent 021f79cb77
commit 816c5fc071
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
15 changed files with 808 additions and 198 deletions
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7
ethers-contract/ethers-contract-abigen/src/contract.rs
View File

@ -79,15 +79,14 @@ impl Context {
#[allow(clippy::too_many_arguments)]
mod #name_mod {
#imports
#struct_decl
impl<'a, M: Middleware> #name<M> {
impl<'a, M: ethers_providers::Middleware> #name<M> {
/// Creates a new contract instance with the specified `ethers`
/// client at the given `Address`. The contract derefs to a `ethers::Contract`
/// object
pub fn new<T: Into<Address>>(address: T, client: Arc<M>) -> Self {
let contract = Contract::new(address.into(), #abi_name.clone(), client);
pub fn new<T: Into<ethers_core::types::Address>>(address: T, client: ::std::sync::Arc<M>) -> Self {
let contract = ethers_contract::Contract::new(address.into(), #abi_name.clone(), client);
Self(contract)
}

15
ethers-contract/ethers-contract-abigen/src/contract/common.rs
View File

@ -15,11 +15,12 @@ pub(crate) fn imports(name: &str) -> TokenStream {
use std::sync::Arc;
use ethers::{
core::{
self as ethers_core,
abi::{Abi, Token, Detokenize, InvalidOutputType, Tokenizable},
types::*, // import all the types so that we can codegen for everything
},
contract::{Contract, builders::{ContractCall, Event}, Lazy},
providers::Middleware,
contract::{self as ethers_contract, Contract, builders::{ContractCall, Event}, Lazy},
providers::{self as ethers_providers,Middleware},
};
}
}
@ -31,12 +32,12 @@ pub(crate) fn struct_declaration(cx: &Context, abi_name: &proc_macro2::Ident) ->
let abi_parse = if !cx.human_readable {
quote! {
pub static #abi_name: Lazy<Abi> = Lazy::new(|| serde_json::from_str(#abi)
pub static #abi_name: ethers_contract::Lazy<ethers_core::abi::Abi> = ethers_contract::Lazy::new(|| serde_json::from_str(#abi)
.expect("invalid abi"));
}
} else {
quote! {
pub static #abi_name: Lazy<Abi> = Lazy::new(|| ethers::core::abi::parse_abi_str(#abi)
pub static #abi_name: ethers_contract::Lazy<ethers_core::abi::Abi> = ethers_contract::Lazy::new(|| ethers::core::abi::parse_abi_str(#abi)
.expect("invalid abi"));
}
};
@ -47,17 +48,17 @@ pub(crate) fn struct_declaration(cx: &Context, abi_name: &proc_macro2::Ident) ->
// Struct declaration
#[derive(Clone)]
pub struct #name<M>(Contract<M>);
pub struct #name<M>(ethers_contract::Contract<M>);
// Deref to the inner contract in order to access more specific functions functions
impl<M> std::ops::Deref for #name<M> {
type Target = Contract<M>;
type Target = ethers_contract::Contract<M>;
fn deref(&self) -> &Self::Target { &self.0 }
}
impl<M: Middleware> std::fmt::Debug for #name<M> {
impl<M: ethers_providers::Middleware> std::fmt::Debug for #name<M> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
f.debug_tuple(stringify!(#name))
.field(&self.address())

146
ethers-contract/ethers-contract-abigen/src/contract/events.rs
View File

@ -2,7 +2,7 @@ use super::{types, util, Context};
use anyhow::Result;
use ethers_core::abi::{Event, EventExt, EventParam, Hash, ParamType, SolStruct};
use inflector::Inflector;
use proc_macro2::{Literal, TokenStream};
use proc_macro2::{Ident, Literal, TokenStream};
use quote::quote;
use std::collections::BTreeMap;
use syn::Path;
@ -17,33 +17,123 @@ impl Context {
.map(|event| self.expand_event(event))
.collect::<Result<Vec<_>>>()?;
if data_types.is_empty() {
return Ok(quote! {});
}
// only expand enums when multiple events are present
let events_enum_decl = if sorted_events.values().flatten().count() > 1 {
self.expand_events_enum()
} else {
quote! {}
};
Ok(quote! {
#( #data_types )*
#events_enum_decl
})
}
/// Generate the event filter methods for the contract
pub fn event_methods(&self) -> Result<TokenStream> {
let sorted_events: BTreeMap<_, _> = self.abi.events.clone().into_iter().collect();
let data_types = sorted_events
let filter_methods = sorted_events
.values()
.flatten()
.map(|event| self.expand_filter(event))
.collect::<Vec<_>>();
if data_types.is_empty() {
return Ok(quote! {});
}
let events_method = self.expand_events_method();
Ok(quote! {
#( #data_types )*
#( #filter_methods )*
#events_method
})
}
/// Generate an enum with a variant for each event
fn expand_events_enum(&self) -> TokenStream {
let sorted_events: BTreeMap<_, _> = self.abi.events.clone().into_iter().collect();
let variants = sorted_events
.values()
.flatten()
.map(expand_struct_name)
.collect::<Vec<_>>();
let enum_name = self.expand_event_enum_name();
quote! {
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum #enum_name {
#(#variants(#variants)),*
}
impl ethers_core::abi::Tokenizable for #enum_name {
fn from_token(token: ethers_core::abi::Token) -> Result<Self, ethers_core::abi::InvalidOutputType> where
Self: Sized {
#(
if let Ok(decoded) = #variants::from_token(token.clone()) {
return Ok(#enum_name::#variants(decoded))
}
)*
Err(ethers_core::abi::InvalidOutputType("Failed to decode all event variants".to_string()))
}
fn into_token(self) -> ethers_core::abi::Token {
match self {
#(
#enum_name::#variants(element) => element.into_token()
),*
}
}
}
impl ethers_core::abi::TokenizableItem for #enum_name { }
impl ethers_contract::EthLogDecode for #enum_name {
fn decode_log(log: &ethers_core::abi::RawLog) -> Result<Self, ethers_core::abi::Error>
where
Self: Sized,
{
#(
if let Ok(decoded) = #variants::decode_log(log) {
return Ok(#enum_name::#variants(decoded))
}
)*
Err(ethers_core::abi::Error::InvalidData)
}
}
}
}
/// The name ident of the events enum
fn expand_event_enum_name(&self) -> Ident {
util::ident(&format!("{}Events", self.contract_name.to_string()))
}
/// Expands the `events` function that bundles all declared events of this contract
fn expand_events_method(&self) -> TokenStream {
let sorted_events: BTreeMap<_, _> = self.abi.events.clone().into_iter().collect();
let mut iter = sorted_events.values().flatten();
if let Some(event) = iter.next() {
let ty = if iter.next().is_some() {
self.expand_event_enum_name()
} else {
expand_struct_name(event)
};
quote! {
/// Returns an [`Event`](ethers_contract::builders::Event) builder for all events of this contract
pub fn events(&self) -> ethers_contract::builders::Event<M, #ty> {
self.0.event_with_filter(Default::default())
}
}
} else {
quote! {}
}
}
/// Expands an event property type.
///
/// Note that this is slightly different than an expanding a Solidity type as
@ -66,7 +156,7 @@ impl Context {
return Ok(quote! {::std::vec::Vec<#ty>});
}
}
quote! { H256 }
quote! { ethers_core::types::H256 }
}
(ParamType::FixedArray(ty, size), true) => {
if let ParamType::Tuple(..) = **ty {
@ -82,7 +172,7 @@ impl Context {
return Ok(quote! {[#ty; #size]});
}
}
quote! { H256 }
quote! { ethers_core::types::H256 }
}
(ParamType::Tuple(..), true) => {
// represents an struct
@ -95,11 +185,11 @@ impl Context {
{
quote! {#ty}
} else {
quote! { H256 }
quote! { ethers_core::types::H256 }
}
}
(ParamType::Bytes, true) | (ParamType::String, true) => {
quote! { H256 }
quote! { ethers_core::types::H256 }
}
(kind, _) => types::expand(kind)?,
})
@ -128,13 +218,12 @@ impl Context {
let name = util::safe_ident(&format!("{}_filter", event.name.to_snake_case()));
// let result = util::ident(&event.name.to_pascal_case());
let result = expand_struct_name(event);
let ev_name = Literal::string(&event.name);
let doc = util::expand_doc(&format!("Gets the contract's `{}` event", event.name));
quote! {
#doc
pub fn #name(&self) -> Event<M, #result> {
self.0.event(#ev_name).expect("event not found (this should never happen)")
pub fn #name(&self) -> ethers_contract::builders::Event<M, #result> {
self.0.event()
}
}
}
@ -159,7 +248,7 @@ impl Context {
let event_abi_name = &event.name;
Ok(quote! {
#[derive(Clone, Debug, Default, Eq, PartialEq, ethers::contract::EthEvent, #derives)]
#[derive(Clone, Debug, Default, Eq, PartialEq, ethers_contract::EthEvent, #derives)]
#[ethevent( name = #event_abi_name, abi = #abi_signature )]
pub #data_type_definition
})
@ -210,17 +299,16 @@ impl Context {
}
/// Expands an ABI event into an identifier for its event data type.
fn expand_struct_name(event: &Event) -> TokenStream {
fn expand_struct_name(event: &Event) -> Ident {
// TODO: get rid of `Filter` suffix?
let name = format!("{}Filter", event.name.to_pascal_case());
let event_name = util::ident(&name);
quote! { #event_name }
util::ident(&name)
}
/// Expands an event data structure from its name-type parameter pairs. Returns
/// a tuple with the type definition (i.e. the struct declaration) and
/// construction (i.e. code for creating an instance of the event data).
fn expand_data_struct(name: &TokenStream, params: &[(TokenStream, TokenStream)]) -> TokenStream {
fn expand_data_struct(name: &Ident, params: &[(TokenStream, TokenStream)]) -> TokenStream {
let fields = params
.iter()
.map(|(name, ty)| quote! { pub #name: #ty })
@ -231,7 +319,7 @@ fn expand_data_struct(name: &TokenStream, params: &[(TokenStream, TokenStream)])
/// Expands an event data named tuple from its name-type parameter pairs.
/// Returns a tuple with the type definition and construction.
fn expand_data_tuple(name: &TokenStream, params: &[(TokenStream, TokenStream)]) -> TokenStream {
fn expand_data_tuple(name: &Ident, params: &[(TokenStream, TokenStream)]) -> TokenStream {
let fields = params
.iter()
.map(|(_, ty)| quote! { pub #ty })
@ -256,7 +344,7 @@ fn expand_hash(hash: Hash) -> TokenStream {
let bytes = hash.as_bytes().iter().copied().map(Literal::u8_unsuffixed);
quote! {
H256([#( #bytes ),*])
ethers_core::types::H256([#( #bytes ),*])
}
}
@ -296,10 +384,8 @@ mod tests {
let cx = test_context();
assert_quote!(cx.expand_filter(&event), {
#[doc = "Gets the contract's `Transfer` event"]
pub fn transfer_filter(&self) -> Event<M, TransferFilter> {
self.0
.event("Transfer")
.expect("event not found (this should never happen)")
pub fn transfer_filter(&self) -> ethers_contract::builders::Event<M, TransferFilter> {
self.0.event()
}
});
}
@ -331,7 +417,7 @@ mod tests {
assert_quote!(definition, {
struct FooFilter {
pub a: bool,
pub p1: Address,
pub p1: ethers_core::types::Address,
}
});
}
@ -361,7 +447,7 @@ mod tests {
let definition = expand_data_tuple(&name, &params);
assert_quote!(definition, {
struct FooFilter(pub bool, pub Address);
struct FooFilter(pub bool, pub ethers_core::types::Address);
});
}
@ -373,7 +459,7 @@ mod tests {
"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f".parse().unwrap()
),
{
H256([
ethers_core::types::H256([
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
])

6
ethers-contract/ethers-contract-abigen/src/contract/methods.rs
View File

@ -39,7 +39,7 @@ fn expand_function(function: &Function, alias: Option<Ident>) -> Result<TokenStr
let outputs = expand_fn_outputs(&function.outputs)?;
let result = quote! { ContractCall<M, #outputs> };
let result = quote! { ethers_contract::builders::ContractCall<M, #outputs> };
let arg = expand_inputs_call_arg(&function.inputs);
let doc = util::expand_doc(&format!(
@ -179,7 +179,7 @@ mod tests {
],
)
.unwrap(),
{ , a: bool, b: Address },
{ , a: bool, b: ethers_core::types::Address },
);
}
@ -214,7 +214,7 @@ mod tests {
},
],)
.unwrap(),
{ (bool, Address) },
{ (bool, ethers_core::types::Address) },
);
}
}

4
ethers-contract/ethers-contract-abigen/src/contract/types.rs
View File

@ -5,7 +5,7 @@ use quote::quote;
pub(crate) fn expand(kind: &ParamType) -> Result<TokenStream> {
match kind {
ParamType::Address => Ok(quote! { Address }),
ParamType::Address => Ok(quote! { ethers_core::types::Address }),
ParamType::Bytes => Ok(quote! { Vec<u8> }),
ParamType::Int(n) => match n / 8 {
1 => Ok(quote! { i8 }),
@ -22,7 +22,7 @@ pub(crate) fn expand(kind: &ParamType) -> Result<TokenStream> {
3..=4 => Ok(quote! { u32 }),
5..=8 => Ok(quote! { u64 }),
9..=16 => Ok(quote! { u128 }),
17..=32 => Ok(quote! { U256 }),
17..=32 => Ok(quote! { ethers_core::types::U256 }),
_ => Err(anyhow!("unsupported solidity type uint{}", n)),
},
ParamType::Bool => Ok(quote! { bool }),

449
ethers-contract/ethers-contract-derive/src/lib.rs
View File

@ -8,8 +8,8 @@ use proc_macro2::{Literal, Span};
use quote::{quote, quote_spanned};
use syn::spanned::Spanned as _;
use syn::{
parse::Error, parse_macro_input, AttrStyle, Data, DeriveInput, Expr, Fields, GenericArgument,
Lit, Meta, NestedMeta, PathArguments, Type,
parse::Error, parse_macro_input, AttrStyle, Data, DeriveInput, Expr, Field, Fields,
GenericArgument, Lit, Meta, NestedMeta, PathArguments, Type,
};
use abigen::{expand, ContractArgs};
@ -79,6 +79,8 @@ pub fn abigen(input: TokenStream) -> TokenStream {
///
/// Additional arguments can be specified using the `#[ethevent(...)]` attribute:
///
/// For the struct:
///
/// - `name`, `name = "..."`: Overrides the generated `EthEvent` name, default is the
/// struct's name.
/// - `signature`, `signature = "..."`: The signature as hex string to override the
@ -86,9 +88,17 @@ pub fn abigen(input: TokenStream) -> TokenStream {
/// - `abi`, `abi = "..."`: The ABI signature for the event this event's data corresponds to.
/// The `abi` should be solidity event definition or a tuple of the event's types in case the
/// event has non elementary (other `EthAbiType`) types as members
/// - `anonymous`: A flag to mark this as an anonymous event
///
/// For fields:
///
/// - `indexed`: flag to mark a field as an indexed event input
/// - `name`: override the name of an indexed event input, default is the rust field name
///
/// # Example
/// ```ignore
/// # use ethers_core::types::Address;
///
/// #[derive(Debug, EthAbiType)]
/// struct Inner {
/// inner: Address,
@ -98,8 +108,10 @@ pub fn abigen(input: TokenStream) -> TokenStream {
/// #[derive(Debug, EthEvent)]
/// #[ethevent(abi = "ValueChangedEvent((address,string),string)")]
/// struct ValueChangedEvent {
/// inner: Inner,
/// #[ethevent(indexed, name = "_target")]
/// target: Address,
/// msg: String,
/// inner: Inner,
/// }
/// ```
#[proc_macro_derive(EthEvent, attributes(ethevent))]
@ -113,14 +125,13 @@ pub fn derive_abi_event(input: TokenStream) -> TokenStream {
let event_name = attributes
.name
.map(|(n, _)| n)
.map(|(s, _)| s)
.unwrap_or_else(|| input.ident.to_string());
let (abi, hash) = if let Some((src, span)) = attributes.abi {
let mut event = if let Some((src, span)) = attributes.abi {
// try to parse as solidity event
if let Ok(mut event) = parse_event(&src) {
event.name = event_name.clone();
(event.abi_signature(), event.signature())
if let Ok(event) = parse_event(&src) {
event
} else {
// try as tuple
if let Some(inputs) = Reader::read(
@ -142,12 +153,11 @@ pub fn derive_abi_event(input: TokenStream) -> TokenStream {
),
_ => None,
}) {
let event = Event {
Event {
name: event_name.clone(),
inputs,
anonymous: false,
};
(event.abi_signature(), event.signature())
}
} else {
match src.parse::<Source>().and_then(|s| s.get()) {
Ok(abi) => {
@ -157,10 +167,7 @@ pub fn derive_abi_event(input: TokenStream) -> TokenStream {
// this could be mitigated by getting the ABI of each non elementary type at runtime
// and computing the the signature as `static Lazy::...`
match parse_event(&abi) {
Ok(mut event) => {
event.name = event_name.clone();
(event.abi_signature(), event.signature())
}
Ok(event) => event,
Err(err) => {
return TokenStream::from(Error::new(span, err).to_compile_error())
}
@ -173,20 +180,31 @@ pub fn derive_abi_event(input: TokenStream) -> TokenStream {
} else {
// try to determine the abi from the fields
match derive_abi_event_from_fields(&input) {
Ok(mut event) => {
event.name = event_name.clone();
(event.abi_signature(), event.signature())
}
Ok(event) => event,
Err(err) => return TokenStream::from(err.to_compile_error()),
}
};
event.name = event_name.clone();
if let Some((anon, _)) = attributes.anonymous.as_ref() {
event.anonymous = *anon;
}
let decode_log_impl = match derive_decode_from_log_impl(&input, &event) {
Ok(log) => log,
Err(err) => return TokenStream::from(err.to_compile_error()),
};
let (abi, hash) = (event.abi_signature(), event.signature());
let signature = if let Some((hash, _)) = attributes.signature_hash {
signature(&hash)
} else {
signature(hash.as_bytes())
};
let anon = attributes.anonymous.map(|(b, _)| b).unwrap_or_default();
let ethevent_impl = quote! {
impl ethers_contract::EthEvent for #name {
@ -201,6 +219,14 @@ pub fn derive_abi_event(input: TokenStream) -> TokenStream {
fn abi_signature() -> ::std::borrow::Cow<'static, str> {
#abi.into()
}
fn decode_log(log: &ethers_core::abi::RawLog) -> Result<Self, ethers_core::abi::Error> where Self: Sized {
#decode_log_impl
}
fn is_anonymous() -> bool {
#anon
}
}
};
@ -213,11 +239,259 @@ pub fn derive_abi_event(input: TokenStream) -> TokenStream {
})
}
fn derive_abi_event_from_fields(input: &DeriveInput) -> Result<Event, Error> {
let types: Vec<_> = match input.data {
struct EventField {
topic_name: Option<String>,
index: usize,
param: EventParam,
}
impl EventField {
fn is_indexed(&self) -> bool {
self.topic_name.is_some()
}
}
// Converts param types for indexed parameters to bytes32 where appropriate
// This applies to strings, arrays, structs and bytes to follow the encoding of
// these indexed param types according to
// https://solidity.readthedocs.io/en/develop/abi-spec.html#encoding-of-indexed-event-parameters
fn topic_param_type_quote(kind: &ParamType) -> proc_macro2::TokenStream {
match kind {
ParamType::String
| ParamType::Bytes
| ParamType::Array(_)
| ParamType::FixedArray(_, _)
| ParamType::Tuple(_) => quote! {ethers_core::abi::ParamType::FixedBytes(32)},
ty => param_type_quote(ty),
}
}
fn param_type_quote(kind: &ParamType) -> proc_macro2::TokenStream {
match kind {
ParamType::Address => {
quote! {ethers_core::abi::ParamType::Address}
}
ParamType::Bytes => {
quote! {ethers_core::abi::ParamType::Bytes}
}
ParamType::Int(size) => {
let size = Literal::usize_suffixed(*size);
quote! {ethers_core::abi::ParamType::Int(#size)}
}
ParamType::Uint(size) => {
let size = Literal::usize_suffixed(*size);
quote! {ethers_core::abi::ParamType::Uint(#size)}
}
ParamType::Bool => {
quote! {ethers_core::abi::ParamType::Bool}
}
ParamType::String => {
quote! {ethers_core::abi::ParamType::String}
}
ParamType::Array(ty) => {
let ty = param_type_quote(&*ty);
quote! {ethers_core::abi::ParamType::Array(Box::new(#ty))}
}
ParamType::FixedBytes(size) => {
let size = Literal::usize_suffixed(*size);
quote! {ethers_core::abi::ParamType::FixedBytes(#size)}
}
ParamType::FixedArray(ty, size) => {
let ty = param_type_quote(&*ty);
let size = Literal::usize_suffixed(*size);
quote! {ethers_core::abi::ParamType::FixedArray(Box::new(#ty),#size)}
}
ParamType::Tuple(tuple) => {
let elements = tuple.iter().map(param_type_quote);
quote! {
ethers_core::abi::ParamType::Tuple(
vec![
#( #elements ),*
]
)
}
}
}
}
fn derive_decode_from_log_impl(
input: &DeriveInput,
event: &Event,
) -> Result<proc_macro2::TokenStream, Error> {
let fields: Vec<_> = match input.data {
Data::Struct(ref data) => match data.fields {
Fields::Named(ref fields) => fields.named.iter().map(|f| &f.ty).collect(),
Fields::Unnamed(ref fields) => fields.unnamed.iter().map(|f| &f.ty).collect(),
Fields::Named(ref fields) => {
if fields.named.len() != event.inputs.len() {
return Err(Error::new(
fields.span(),
format!(
"EthEvent {}'s fields length don't match with signature inputs {}",
event.name,
event.abi_signature()
),
));
}
fields.named.iter().collect()
}
Fields::Unnamed(ref fields) => {
if fields.unnamed.len() != event.inputs.len() {
return Err(Error::new(
fields.span(),
format!(
"EthEvent {}'s fields length don't match with signature inputs {}",
event.name,
event.abi_signature()
),
));
}
fields.unnamed.iter().collect()
}
Fields::Unit => {
return Err(Error::new(
input.span(),
"EthEvent cannot be derived for empty structs and unit",
));
}
},
Data::Enum(_) => {
return Err(Error::new(
input.span(),
"EthEvent cannot be derived for enums",
));
}
Data::Union(_) => {
return Err(Error::new(
input.span(),
"EthEvent cannot be derived for unions",
));
}
};
let mut event_fields = Vec::with_capacity(fields.len());
for (index, field) in fields.iter().enumerate() {
let mut param = event.inputs[index].clone();
let (topic_name, indexed) = parse_field_attributes(field)?;
if indexed {
param.indexed = true;
}
let topic_name = if param.indexed {
if topic_name.is_none() {
Some(param.name.clone())
} else {
topic_name
}
} else {
None
};
event_fields.push(EventField {
topic_name,
index,
param,
});
}
// convert fields to params list
let topic_types = event_fields
.iter()
.filter(|f| f.is_indexed())
.map(|f| topic_param_type_quote(&f.param.kind));
let topic_types_init = quote! {let topic_types = vec![#( #topic_types ),*];};
let data_types = event_fields
.iter()
.filter(|f| !f.is_indexed())
.map(|f| param_type_quote(&f.param.kind));
let data_types_init = quote! {let data_types = vec![#( #data_types ),*];};
// decode
let (signature_check, flat_topics_init, topic_tokens_len_check) = if event.anonymous {
(
quote! {},
quote! {
let flat_topics = topics.iter().flat_map(|t| t.as_ref().to_vec()).collect::<Vec<u8>>();
},
quote! {
if topic_tokens.len() != topics.len() {
return Err(ethers_core::abi::Error::InvalidData);
}
},
)
} else {
(
quote! {
let event_signature = topics.get(0).ok_or(ethers_core::abi::Error::InvalidData)?;
if event_signature != &Self::signature() {
return Err(ethers_core::abi::Error::InvalidData);
}
},
quote! {
let flat_topics = topics.iter().skip(1).flat_map(|t| t.as_ref().to_vec()).collect::<Vec<u8>>();
},
quote! {
if topic_tokens.is_empty() || topic_tokens.len() != topics.len() - 1 {
return Err(ethers_core::abi::Error::InvalidData);
}
},
)
};
// check if indexed are sorted
let tokens_init = if event_fields
.iter()
.filter(|f| f.is_indexed())
.enumerate()
.all(|(idx, f)| f.index == idx)
{
quote! {
let topic_tokens = ethers_core::abi::decode(&topic_types, &flat_topics)?;
#topic_tokens_len_check
let data_tokens = ethers_core::abi::decode(&data_types, &data)?;
let tokens:Vec<_> = topic_tokens.into_iter().chain(data_tokens.into_iter()).collect();
}
} else {
let swap_tokens = event_fields.iter().map(|field| {
if field.is_indexed() {
quote! { topic_tokens.remove(0) }
} else {
quote! { data_tokens.remove(0) }
}
});
quote! {
let mut topic_tokens = ethers_core::abi::decode(&topic_types, &flat_topics)?;
#topic_tokens_len_check
let mut data_tokens = ethers_core::abi::decode(&data_types, &data)?;
let mut tokens = Vec::with_capacity(topics.len() + data_tokens.len());
#( tokens.push(#swap_tokens); )*
}
};
Ok(quote! {
let ethers_core::abi::RawLog {data, topics} = log;
#signature_check
#topic_types_init
#data_types_init
#flat_topics_init
#tokens_init
ethers_core::abi::Detokenize::from_tokens(tokens).map_err(|_|ethers_core::abi::Error::InvalidData)
})
}
fn derive_abi_event_from_fields(input: &DeriveInput) -> Result<Event, Error> {
let fields: Vec<_> = match input.data {
Data::Struct(ref data) => match data.fields {
Fields::Named(ref fields) => fields.named.iter().collect(),
Fields::Unnamed(ref fields) => fields.unnamed.iter().collect(),
Fields::Unit => {
return Err(Error::new(
input.span(),
@ -239,17 +513,24 @@ fn derive_abi_event_from_fields(input: &DeriveInput) -> Result<Event, Error> {
}
};
let inputs = types
let inputs = fields
.iter()
.map(|ty| find_parameter_type(ty))
.map(|f| {
let name = f
.ident
.as_ref()
.map(|name| name.to_string())
.unwrap_or_else(|| "".to_string());
find_parameter_type(&f.ty).map(|ty| (name, ty))
})
.collect::<Result<Vec<_>, _>>()?;
let event = Event {
name: "".to_string(),
inputs: inputs
.into_iter()
.map(|kind| EventParam {
name: "".to_string(),
.map(|(name, kind)| EventParam {
name,
kind,
indexed: false,
})
@ -259,6 +540,55 @@ fn derive_abi_event_from_fields(input: &DeriveInput) -> Result<Event, Error> {
Ok(event)
}
fn parse_field_attributes(field: &Field) -> Result<(Option<String>, bool), Error> {
let mut indexed = false;
let mut topic_name = None;
for a in field.attrs.iter() {
if let AttrStyle::Outer = a.style {
if let Ok(Meta::List(meta)) = a.parse_meta() {
if meta.path.is_ident("ethevent") {
for n in meta.nested.iter() {
if let NestedMeta::Meta(meta) = n {
match meta {
Meta::Path(path) => {
if path.is_ident("indexed") {
indexed = true;
} else {
return Err(Error::new(
path.span(),
"unrecognized ethevent parameter",
));
}
}
Meta::List(meta) => {
return Err(Error::new(
meta.path.span(),
"unrecognized ethevent parameter",
));
}
Meta::NameValue(meta) => {
if meta.path.is_ident("name") {
if let Lit::Str(ref lit_str) = meta.lit {
topic_name = Some(lit_str.value());
} else {
return Err(Error::new(
meta.span(),
"name attribute must be a string",
));
}
}
}
}
}
}
}
}
}
}
Ok((topic_name, indexed))
}
fn find_parameter_type(ty: &Type) -> Result<ParamType, Error> {
match ty {
Type::Array(ty) => {
@ -315,13 +645,10 @@ fn find_parameter_type(ty: &Type) -> Result<ParamType, Error> {
.collect::<Result<Vec<_>, _>>()?;
Ok(ParamType::Tuple(params))
}
_ => {
eprintln!("Found other types");
Err(Error::new(
ty.span(),
"Failed to derive proper ABI from fields",
))
}
_ => Err(Error::new(
ty.span(),
"Failed to derive proper ABI from fields",
)),
}
}
@ -496,23 +823,21 @@ fn derive_tokenizeable_impl(input: &DeriveInput) -> proc_macro2::TokenStream {
)
}
}
impl<#generic_params> ethers_core::abi::TokenizableItem for #name<#generic_args>
where
#generic_predicates
#tokenize_predicates
{ }
}
}
#[derive(Default)]
struct Attributes {
name: Option<(String, Span)>,
abi: Option<(String, Span)>,
signature_hash: Option<(Vec<u8>, Span)>,
}
impl Default for Attributes {
fn default() -> Self {
Self {
name: None,
abi: None,
signature_hash: None,
}
}
anonymous: Option<(bool, Span)>,
}
fn parse_attributes(input: &DeriveInput) -> Result<Attributes, proc_macro2::TokenStream> {
@ -525,6 +850,20 @@ fn parse_attributes(input: &DeriveInput) -> Result<Attributes, proc_macro2::Toke
if let NestedMeta::Meta(meta) = n {
match meta {
Meta::Path(path) => {
if let Some(name) = path.get_ident() {
if &*name.to_string() == "anonymous" {
if result.anonymous.is_none() {
result.anonymous = Some((true, name.span()));
continue;
} else {
return Err(Error::new(
name.span(),
"anonymous already specified",
)
.to_compile_error());
}
}
}
return Err(Error::new(
path.span(),
"unrecognized ethevent parameter",
@ -532,7 +871,6 @@ fn parse_attributes(input: &DeriveInput) -> Result<Attributes, proc_macro2::Toke
.to_compile_error());
}
Meta::List(meta) => {
// TODO support raw list
return Err(Error::new(
meta.path.span(),
"unrecognized ethevent parameter",
@ -540,7 +878,26 @@ fn parse_attributes(input: &DeriveInput) -> Result<Attributes, proc_macro2::Toke
.to_compile_error());
}
Meta::NameValue(meta) => {
if meta.path.is_ident("name") {
if meta.path.is_ident("anonymous") {
if let Lit::Bool(ref bool_lit) = meta.lit {
if result.anonymous.is_none() {
result.anonymous =
Some((bool_lit.value, bool_lit.span()));
} else {
return Err(Error::new(
meta.span(),
"anonymous already specified",
)
.to_compile_error());
}
} else {
return Err(Error::new(
meta.span(),
"name must be a string",
)
.to_compile_error());
}
} else if meta.path.is_ident("name") {
if let Lit::Str(ref lit_str) = meta.lit {
if result.name.is_none() {
result.name =

55
ethers-contract/src/contract.rs
View File

@ -1,7 +1,8 @@
use super::{
use crate::{
base::{encode_function_data, AbiError, BaseContract},
call::ContractCall,
event::Event,
event::{EthEvent, Event},
EthLogDecode,
};
use ethers_core::{
@ -108,7 +109,7 @@ use std::{fmt::Debug, marker::PhantomData, sync::Arc};
/// ```no_run
/// # async fn foo() -> Result<(), Box<dyn std::error::Error>> {
/// use ethers_core::{abi::Abi, types::Address};
/// use ethers_contract::Contract;
/// use ethers_contract::{Contract, EthEvent};
/// use ethers_providers::{Provider, Http, Middleware};
/// use ethers_signers::Wallet;
/// use std::convert::TryFrom;
@ -119,7 +120,7 @@ use std::{fmt::Debug, marker::PhantomData, sync::Arc};
/// # let client = Provider::<Http>::try_from("http://localhost:8545").unwrap();
/// # let contract = Contract::new(address, abi, client);
///
/// #[derive(Clone, Debug)]
/// #[derive(Clone, Debug, EthEvent)]
/// struct ValueChanged {
/// old_author: Address,
/// new_author: Address,
@ -127,25 +128,8 @@ use std::{fmt::Debug, marker::PhantomData, sync::Arc};
/// new_value: String,
/// }
///
/// impl Detokenize for ValueChanged {
/// fn from_tokens(tokens: Vec<Token>) -> Result<ValueChanged, InvalidOutputType> {
/// let old_author: Address = tokens[1].clone().into_address().unwrap();
/// let new_author: Address = tokens[1].clone().into_address().unwrap();
/// let old_value = tokens[2].clone().into_string().unwrap();
/// let new_value = tokens[3].clone().into_string().unwrap();
///
/// Ok(Self {
/// old_author,
/// new_author,
/// old_value,
/// new_value,
/// })
/// }
/// }
///
///
/// let logs: Vec<ValueChanged> = contract
/// .event("ValueChanged")?
/// .event()
/// .from_block(0u64)
/// .query()
/// .await?;
@ -179,18 +163,25 @@ impl<M: Middleware> Contract<M> {
}
}
/// Returns an [`Event`](crate::builders::Event) builder for the provided event name.
pub fn event<D: Detokenize>(&self, name: &str) -> Result<Event<M, D>, Error> {
/// Returns an [`Event`](crate::builders::Event) builder for the provided event.
pub fn event<D: EthEvent>(&self) -> Event<M, D> {
self.event_with_filter(Filter::new().event(&D::abi_signature()))
}
/// Returns an [`Event`](crate::builders::Event) builder with the provided filter.
pub fn event_with_filter<D: EthLogDecode>(&self, filter: Filter) -> Event<M, D> {
Event {
provider: &self.client,
filter: filter.address(self.address),
datatype: PhantomData,
}
}
/// Returns an [`Event`](crate::builders::Event) builder with the provided name.
pub fn event_for_name<D: EthLogDecode>(&self, name: &str) -> Result<Event<M, D>, Error> {
// get the event's full name
let event = self.base_contract.abi.event(name)?;
Ok(Event {
provider: &self.client,
filter: Filter::new()
.event(&event.abi_signature())
.address(self.address),
event: &event,
datatype: PhantomData,
})
Ok(self.event_with_filter(Filter::new().event(&event.abi_signature())))
}
/// Returns a transaction builder for the provided function name. If there are

60
ethers-contract/src/event.rs
View File

@ -1,7 +1,7 @@
use crate::{base::decode_event, stream::EventStream, ContractError};
use crate::{stream::EventStream, ContractError, EthLogDecode};
use ethers_core::{
abi::{Detokenize, Event as AbiEvent},
abi::{Detokenize, RawLog},
types::{BlockNumber, Filter, Log, TxHash, ValueOrArray, H256, U64},
};
use ethers_providers::{FilterWatcher, Middleware, PubsubClient, SubscriptionStream};
@ -21,22 +21,52 @@ pub trait EthEvent: Detokenize {
/// Retrieves the ABI signature for the event this data corresponds
/// to.
fn abi_signature() -> Cow<'static, str>;
/// Decodes an Ethereum `RawLog` into an instance of the type.
fn decode_log(log: &RawLog) -> Result<Self, ethers_core::abi::Error>
where
Self: Sized;
/// Returns true if this is an anonymous event
fn is_anonymous() -> bool;
/// Returns an Event builder for the ethereum event represented by this types ABI signature.
fn new<M: Middleware>(filter: Filter, provider: &M) -> Event<M, Self>
where
Self: Sized,
{
let filter = filter.event(&Self::abi_signature());
Event {
filter,
provider,
datatype: PhantomData,
}
}
}
// Convenience implementation
impl<T: EthEvent> EthLogDecode for T {
fn decode_log(log: &RawLog) -> Result<Self, ethers_core::abi::Error>
where
Self: Sized,
{
T::decode_log(log)
}
}
/// Helper for managing the event filter before querying or streaming its logs
#[derive(Debug)]
#[must_use = "event filters do nothing unless you `query` or `stream` them"]
pub struct Event<'a: 'b, 'b, M, D> {
pub struct Event<'a, M, D> {
/// The event filter's state
pub filter: Filter,
/// The ABI of the event which is being filtered
pub event: &'b AbiEvent,
pub(crate) provider: &'a M,
/// Stores the event datatype
pub(crate) datatype: PhantomData<D>,
}
// TODO: Improve these functions
impl<M, D: Detokenize> Event<'_, '_, M, D> {
impl<M, D: EthLogDecode> Event<'_, M, D> {
/// Sets the filter's `from` block
#[allow(clippy::wrong_self_convention)]
pub fn from_block<T: Into<BlockNumber>>(mut self, block: T) -> Self {
@ -84,10 +114,10 @@ impl<M, D: Detokenize> Event<'_, '_, M, D> {
}
}
impl<'a, 'b, M, D> Event<'a, 'b, M, D>
impl<'a, M, D> Event<'a, M, D>
where
M: Middleware,
D: 'b + Detokenize + Clone,
D: EthLogDecode,
{
/// Returns a stream for the event
pub async fn stream(
@ -110,11 +140,11 @@ where
}
}
impl<'a, 'b, M, D> Event<'a, 'b, M, D>
impl<'a, M, D> Event<'a, M, D>
where
M: Middleware,
<M as Middleware>::Provider: PubsubClient,
D: 'b + Detokenize + Clone,
D: EthLogDecode,
{
/// Returns a subscription for the event
pub async fn subscribe(
@ -137,10 +167,10 @@ where
}
}
impl<M, D> Event<'_, '_, M, D>
impl<M, D> Event<'_, M, D>
where
M: Middleware,
D: Detokenize + Clone,
D: EthLogDecode,
{
/// Queries the blockchain for the selected filter and returns a vector of matching
/// event logs
@ -177,7 +207,11 @@ where
}
fn parse_log(&self, log: Log) -> Result<D, ContractError<M>> {
Ok(decode_event(self.event, log.topics, log.data)?)
D::decode_log(&RawLog {
topics: log.topics,
data: log.data.to_vec(),
})
.map_err(From::from)
}
}

3
ethers-contract/src/lib.rs
View File

@ -28,6 +28,9 @@ pub use factory::ContractFactory;
mod event;
pub use event::EthEvent;
mod log;
pub use log::{decode_logs, EthLogDecode};
mod stream;
mod multicall;

16
ethers-contract/src/log.rs Normal file
View File

@ -0,0 +1,16 @@
//! Mod of types for ethereum logs
use ethers_core::abi::Error;
use ethers_core::abi::RawLog;
/// A trait for types (events) that can be decoded from a `RawLog`
pub trait EthLogDecode {
/// decode from a `RawLog`
fn decode_log(log: &RawLog) -> Result<Self, Error>
where
Self: Sized;
}
/// Decodes a series of logs into a vector
pub fn decode_logs<T: EthLogDecode>(logs: &[RawLog]) -> Result<Vec<T>, Error> {
logs.iter().map(T::decode_log).collect()
}

43
ethers-contract/tests/common/derive.rs
View File

@ -1,5 +1,5 @@
use ethers::core::types::{H160, H256, I256, U128, U256};
use ethers_contract::{EthAbiType, EthEvent};
use ethers_contract::{abigen, EthAbiType, EthEvent};
use ethers_core::abi::Tokenizable;
use ethers_core::types::Address;
@ -195,3 +195,44 @@ fn can_set_eth_abi_attribute() {
ValueChangedEvent2::abi_signature()
);
}
#[test]
fn can_derive_indexed_and_anonymous_attribute() {
#[derive(Debug, PartialEq, EthEvent)]
#[ethevent(anonymous)]
struct ValueChangedEvent {
old_author: Address,
#[ethevent(indexed, name = "newAuthor")]
new_author: Address,
old_value: String,
new_value: String,
}
assert_eq!(
"ValueChangedEvent(address,address,string,string) anonymous",
ValueChangedEvent::abi_signature()
);
}
#[test]
fn can_generate_ethevent_from_json() {
abigen!(DsProxyFactory,
"ethers-middleware/contracts/DsProxyFactory.json",
methods {
build(address) as build_with_owner;
}
);
assert_eq!(
"Created(address,address,address,address)",
CreatedFilter::abi_signature()
);
assert_eq!(
H256([
37, 155, 48, 202, 57, 136, 92, 109, 128, 26, 11, 93, 188, 152, 134, 64, 243, 194, 94,
47, 55, 83, 31, 225, 56, 197, 197, 175, 137, 85, 212, 27,
]),
CreatedFilter::signature()
);
}

8
ethers-contract/tests/common/mod.rs
View File

@ -4,18 +4,20 @@ use ethers_core::{
types::{Address, Bytes},
};
use ethers_contract::{Contract, ContractFactory, EthAbiType};
use ethers_contract::{Contract, ContractFactory, EthEvent};
use ethers_core::utils::{GanacheInstance, Solc};
use ethers_middleware::signer::SignerMiddleware;
use ethers_providers::{Http, Middleware, Provider};
use ethers_signers::LocalWallet;
use std::{convert::TryFrom, sync::Arc, time::Duration};
// Note: The `EthAbiType` derive macro implements the necessary conversion between `Tokens` and
// Note: The `EthEvent` derive macro implements the necessary conversion between `Tokens` and
// the struct
#[derive(Clone, Debug, EthAbiType)]
#[derive(Clone, Debug, EthEvent)]
pub struct ValueChanged {
#[ethevent(indexed)]
pub old_author: Address,
#[ethevent(indexed)]
pub new_author: Address,
pub old_value: String,
pub new_value: String,

10
ethers-contract/tests/contract.rs
View File

@ -109,8 +109,7 @@ mod eth_tests {
// and we can fetch the events
let logs: Vec<ValueChanged> = contract
.event("ValueChanged")
.unwrap()
.event()
.from_block(0u64)
.topic1(client.address()) // Corresponds to the first indexed parameter
.query()
@ -123,8 +122,7 @@ mod eth_tests {
// and we can fetch the events at a block hash
let hash = client.get_block(1).await.unwrap().unwrap().hash.unwrap();
let logs: Vec<ValueChanged> = contract
.event("ValueChanged")
.unwrap()
.event()
.at_block_hash(hash)
.topic1(client.address()) // Corresponds to the first indexed parameter
.query()
@ -256,14 +254,14 @@ mod eth_tests {
let contract = deploy(client, abi.clone(), bytecode).await;
// We spawn the event listener:
let event = contract.event::<ValueChanged>("ValueChanged").unwrap();
let event = contract.event::<ValueChanged>();
let mut stream = event.stream().await.unwrap();
assert_eq!(stream.id, 1.into());
// Also set up a subscription for the same thing
let ws = Provider::connect(ganache.ws_endpoint()).await.unwrap();
let contract2 = ethers_contract::Contract::new(contract.address(), abi, ws);
let event2 = contract2.event::<ValueChanged>("ValueChanged").unwrap();
let event2 = contract2.event::<ValueChanged>();
let mut subscription = event2.subscribe().await.unwrap();
assert_eq!(subscription.id, 2.into());

95
ethers-middleware/contracts/DsProxyFactory.json Normal file
View File

@ -0,0 +1,95 @@
[
{
"constant": true,
"inputs": [
{
"name": "",
"type": "address"
}
],
"name": "isProxy",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "cache",
"outputs": [
{
"name": "",
"type": "address"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "build",
"outputs": [
{
"name": "proxy",
"type": "address"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "owner",
"type": "address"
}
],
"name": "build",
"outputs": [
{
"name": "proxy",
"type": "address"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "sender",
"type": "address"
},
{
"indexed": true,
"name": "owner",
"type": "address"
},
{
"indexed": false,
"name": "proxy",
"type": "address"
},
{
"indexed": false,
"name": "cache",
"type": "address"
}
],
"name": "Created",
"type": "event"
}
]

89
ethers-middleware/src/transformer/ds_proxy/factory.rs
View File

@ -15,6 +15,18 @@ pub static ADDRESS_BOOK: Lazy<HashMap<U256, Address>> = Lazy::new(|| {
m
});
///
/// Generated with
/// ```ignore
/// # use ethers_contract::abigen;
/// abigen!(DsProxyFactory,
/// "ethers-middleware/contracts/DsProxyFactory.json",
/// methods {
/// build() as build_with_sender;
/// }
/// );
/// ```
///
// Auto-generated type-safe bindings
pub use dsproxyfactory_mod::*;
#[allow(clippy::too_many_arguments)]
@ -23,7 +35,7 @@ mod dsproxyfactory_mod {
#![allow(unused_imports)]
use ethers_contract::{
builders::{ContractCall, Event},
Contract, Lazy,
Contract, EthEvent, Lazy,
};
use ethers_core::{
abi::{parse_abi, Abi, Detokenize, InvalidOutputType, Token, Tokenizable},
@ -64,8 +76,19 @@ mod dsproxyfactory_mod {
.method_hash([41, 113, 3, 136], p0)
.expect("method not found (this should never happen)")
}
#[doc = "Calls the contract's `build` (0xf3701da2) function"]
pub fn build(&self, owner: Address) -> ContractCall<M, Address> {
///Calls the contract's `build` (0x8e1a55fc) function
pub fn build_with_sender(
&self,
) -> ethers_contract::builders::ContractCall<M, ethers_core::types::Address> {
self.0
.method_hash([142, 26, 85, 252], ())
.expect("method not found (this should never happen)")
}
///Calls the contract's `build` (0xf3701da2) function
pub fn build(
&self,
owner: ethers_core::types::Address,
) -> ethers_contract::builders::ContractCall<M, ethers_core::types::Address> {
self.0
.method_hash([243, 112, 29, 162], owner)
.expect("method not found (this should never happen)")
@ -76,60 +99,24 @@ mod dsproxyfactory_mod {
.method_hash([96, 199, 210, 149], ())
.expect("method not found (this should never happen)")
}
#[doc = "Gets the contract's `Created` event"]
pub fn created_filter(&self) -> Event<M, CreatedFilter> {
self.0
.event("Created")
.expect("event not found (this should never happen)")
///Gets the contract's `Created` event
pub fn created_filter(&self) -> ethers_contract::builders::Event<M, CreatedFilter> {
self.0.event()
}
/// Returns an [`Event`](ethers_contract::builders::Event) builder for all events of this contract
pub fn events(&self) -> ethers_contract::builders::Event<M, CreatedFilter> {
self.0.event_with_filter(Default::default())
}
}
#[derive(Clone, Debug, Default, Eq, PartialEq)]
#[derive(Clone, Debug, Default, Eq, PartialEq, EthEvent)]
#[ethevent(name = "Created")]
pub struct CreatedFilter {
#[ethevent(indexed)]
pub sender: Address,
#[ethevent(indexed)]
pub owner: Address,
pub proxy: Address,
pub cache: Address,
}
impl CreatedFilter {
#[doc = r" Retrieves the signature for the event this data corresponds to."]
#[doc = r" This signature is the Keccak-256 hash of the ABI signature of"]
#[doc = r" this event."]
pub const fn signature() -> H256 {
H256([
37, 155, 48, 202, 57, 136, 92, 109, 128, 26, 11, 93, 188, 152, 134, 64, 243, 194,
94, 47, 55, 83, 31, 225, 56, 197, 197, 175, 137, 85, 212, 27,
])
}
#[doc = r" Retrieves the ABI signature for the event this data corresponds"]
#[doc = r" to. For this event the value should always be:"]
#[doc = r""]
#[doc = "`Created(address,address,address,address)`"]
pub const fn abi_signature() -> &'static str {
"Created(address,address,address,address)"
}
}
impl Detokenize for CreatedFilter {
fn from_tokens(tokens: Vec<Token>) -> Result<Self, InvalidOutputType> {
if tokens.len() != 4 {
return Err(InvalidOutputType(format!(
"Expected {} tokens, got {}: {:?}",
4,
tokens.len(),
tokens
)));
}
#[allow(unused_mut)]
let mut tokens = tokens.into_iter();
let sender = Tokenizable::from_token(tokens.next().expect("this should never happen"))?;
let owner = Tokenizable::from_token(tokens.next().expect("this should never happen"))?;
let proxy = Tokenizable::from_token(tokens.next().expect("this should never happen"))?;
let cache = Tokenizable::from_token(tokens.next().expect("this should never happen"))?;
Ok(CreatedFilter {
sender,
owner,
proxy,
cache,
})
}
}
}