Log block import source (#5738)

* the default target peers is 100

* add some comments

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into track-block-import-source

* add block import source

* revert

* update logging text

* fix tests

* lint

* use % instaed of to_string

consensus/types/src/beacon_block.rs

@@ -4,6 +4,7 @@ use derivative::Derivative;
 use serde::{Deserialize, Serialize};
 use ssz::{Decode, DecodeError};
 use ssz_derive::{Decode, Encode};
+use std::fmt;
 use std::marker::PhantomData;
 use superstruct::superstruct;
 use test_random_derive::TestRandom;
@@ -836,6 +837,23 @@ impl<E: EthSpec, Payload: AbstractExecPayload<E>> ForkVersionDeserialize
         ))
     }
 }
+pub enum BlockImportSource {
+    Gossip,
+    Lookup,
+    RangeSync,
+    HttpApi,
+}
+
+impl fmt::Display for BlockImportSource {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            BlockImportSource::Gossip => write!(f, "gossip"),
+            BlockImportSource::Lookup => write!(f, "lookup"),
+            BlockImportSource::RangeSync => write!(f, "range_sync"),
+            BlockImportSource::HttpApi => write!(f, "http_api"),
+        }
+    }
+}
 
 #[cfg(test)]
 mod tests {

consensus/types/src/lib.rs

@@ -122,7 +122,7 @@ pub use crate::attester_slashing::AttesterSlashing;
 pub use crate::beacon_block::{
     BeaconBlock, BeaconBlockAltair, BeaconBlockBase, BeaconBlockBellatrix, BeaconBlockCapella,
     BeaconBlockDeneb, BeaconBlockElectra, BeaconBlockRef, BeaconBlockRefMut, BlindedBeaconBlock,
-    EmptyBlock,
+    BlockImportSource, EmptyBlock,
 };
 pub use crate::beacon_block_body::{
     BeaconBlockBody, BeaconBlockBodyAltair, BeaconBlockBodyBase, BeaconBlockBodyBellatrix,