Add event source (#809)

Author: sunce86

ethcontract-mock/src/details/mod.rs

@@ -64,6 +64,7 @@ struct MockTransportState {
     receipts: HashMap<H256, TransactionReceipt>,
 }
 
+#[allow(clippy::type_complexity)]
 impl MockTransport {
     /// Creates a new transport.
     pub fn new(chain_id: u64) -> Self {
@@ -1007,7 +1008,7 @@ impl<P: Tokenize + Send + 'static, R: Tokenize + Send + 'static> ExpectationApi
     }
 }
 
-#[allow(clippy::enum_variant_names)]
+#[allow(clippy::enum_variant_names, clippy::type_complexity)]
 enum Predicate<P: Tokenize + Send + 'static> {
     None,
     Predicate(Box<dyn predicates::Predicate<P> + Send>),
@@ -1026,6 +1027,7 @@ impl<P: Tokenize + Send + 'static> Predicate<P> {
     }
 }
 
+#[allow(clippy::type_complexity)]
 enum Returns<P: Tokenize + Send + 'static, R: Tokenize + Send + 'static> {
     Default,
     Error(String),

ethcontract/src/contract/event/data.rs

@@ -1,7 +1,7 @@
 //! Module contains code for parsing and manipulating event data.
 use crate::{errors::ExecutionError, tokens::Tokenize};
 use ethcontract_common::abi::{Event as AbiEvent, RawLog as AbiRawLog, Token};
-use web3::types::{Log, H256};
+use web3::types::{Log, H160, H256};
 
 /// A contract event
 #[derive(Clone, Debug, Eq, PartialEq)]
@@ -125,6 +125,8 @@ impl<T> Event<EventStatus<T>> {
 /// Additional metadata from the log for the event.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct EventMetadata {
+    /// From which this event originated from
+    pub address: H160,
     /// The hash of the block where the log was produced.
     pub block_hash: H256,
     /// The number of the block where the log was produced.
@@ -146,6 +148,7 @@ pub struct EventMetadata {
 impl EventMetadata {
     fn from_log(log: &Log) -> Option<Self> {
         Some(EventMetadata {
+            address: log.address,
             block_hash: log.block_hash?,
             block_number: log.block_number?.as_u64(),
             transaction_hash: log.transaction_hash?,