expose timestamp on meta block

graph/src/components/store/traits.rs

@@ -405,6 +405,14 @@ pub trait QueryStore: Send + Sync {
 
     fn block_number(&self, block_hash: &BlockHash) -> Result<Option<BlockNumber>, StoreError>;
 
+    /// Returns the blocknumber as well as the timestamp. Timestamp depends on the chain block type
+    /// and can have multiple formats, it can also not be prevent. For now this is only available
+    /// for EVM chains both firehose and rpc.
+    fn block_number_with_timestamp(
+        &self,
+        block_hash: &BlockHash,
+    ) -> Result<Option<(BlockNumber, Option<String>)>, StoreError>;
+
     fn wait_stats(&self) -> Result<PoolWaitStats, StoreError>;
 
     async fn has_deterministic_errors(&self, block: BlockNumber) -> Result<bool, StoreError>;

graphql/src/runner.rs

@@ -159,7 +159,7 @@ where
             let query_res = execute_query(
                 query.clone(),
                 Some(selection_set),
-                resolver.block_ptr.clone(),
+                resolver.block_ptr.as_ref().map(Into::into).clone(),
                 QueryExecutionOptions {
                     resolver,
                     deadline: ENV_VARS.graphql.query_timeout.map(|t| Instant::now() + t),

graphql/src/store/resolver.rs

@@ -25,13 +25,34 @@ pub struct StoreResolver {
     logger: Logger,
     pub(crate) store: Arc<dyn QueryStore>,
     subscription_manager: Arc<dyn SubscriptionManager>,
-    pub(crate) block_ptr: Option<BlockPtr>,
+    pub(crate) block_ptr: Option<BlockPtrTs>,
     deployment: DeploymentHash,
     has_non_fatal_errors: bool,
     error_policy: ErrorPolicy,
     graphql_metrics: Arc<GraphQLMetrics>,
 }
 
+#[derive(Clone, Debug)]
+pub(crate) struct BlockPtrTs {
+    pub ptr: BlockPtr,
+    pub timestamp: Option<String>,
+}
+
+impl From<BlockPtr> for BlockPtrTs {
+    fn from(ptr: BlockPtr) -> Self {
+        Self {
+            ptr,
+            timestamp: None,
+        }
+    }
+}
+
+impl From<&BlockPtrTs> for BlockPtr {
+    fn from(ptr: &BlockPtrTs) -> Self {
+        ptr.ptr.cheap_clone()
+    }
+}
+
 impl CheapClone for StoreResolver {}
 
 impl StoreResolver {
@@ -79,7 +100,7 @@ impl StoreResolver {
         let block_ptr = Self::locate_block(store_clone.as_ref(), bc, state).await?;
 
         let has_non_fatal_errors = store
-            .has_deterministic_errors(block_ptr.block_number())
+            .has_deterministic_errors(block_ptr.ptr.block_number())
             .await?;
 
         let resolver = StoreResolver {
@@ -98,15 +119,16 @@ impl StoreResolver {
     pub fn block_number(&self) -> BlockNumber {
         self.block_ptr
             .as_ref()
-            .map(|ptr| ptr.number as BlockNumber)
+            .map(|ptr| ptr.ptr.number as BlockNumber)
             .unwrap_or(BLOCK_NUMBER_MAX)
     }
 
+    /// locate_block returns the block pointer and it's timestamp when available.
     async fn locate_block(
         store: &dyn QueryStore,
         bc: BlockConstraint,
         state: &DeploymentState,
-    ) -> Result<BlockPtr, QueryExecutionError> {
+    ) -> Result<BlockPtrTs, QueryExecutionError> {
         fn block_queryable(
             state: &DeploymentState,
             block: BlockNumber,
@@ -116,23 +138,39 @@ impl StoreResolver {
                 .map_err(|msg| QueryExecutionError::ValueParseError("block.number".to_owned(), msg))
         }
 
+        fn get_block_ts(
+            store: &dyn QueryStore,
+            ptr: &BlockPtr,
+        ) -> Result<Option<String>, QueryExecutionError> {
+            match store
+                .block_number_with_timestamp(&ptr.hash)
+                .map_err(Into::<QueryExecutionError>::into)?
+            {
+                Some((_, Some(ts))) => Ok(Some(ts)),
+                _ => Ok(None),
+            }
+        }
+
         match bc {
             BlockConstraint::Hash(hash) => {
                 let ptr = store
-                    .block_number(&hash)
+                    .block_number_with_timestamp(&hash)
                     .map_err(Into::into)
-                    .and_then(|number| {
-                        number
+                    .and_then(|result| {
+                        result
                             .ok_or_else(|| {
                                 QueryExecutionError::ValueParseError(
                                     "block.hash".to_owned(),
                                     "no block with that hash found".to_owned(),
                                 )
                             })
-                            .map(|number| BlockPtr::new(hash, number))
+                            .map(|(number, ts)| BlockPtrTs {
+                                ptr: BlockPtr::new(hash, number),
+                                timestamp: ts,
+                            })
                     })?;
 
-                block_queryable(state, ptr.number)?;
+                block_queryable(state, ptr.ptr.number)?;
                 Ok(ptr)
             }
             BlockConstraint::Number(number) => {
@@ -143,7 +181,7 @@ impl StoreResolver {
                 // always return an all zeroes hash when users specify
                 // a block number
                 // See 7a7b9708-adb7-4fc2-acec-88680cb07ec1
-                Ok(BlockPtr::from((web3::types::H256::zero(), number as u64)))
+                Ok(BlockPtr::from((web3::types::H256::zero(), number as u64)).into())
             }
             BlockConstraint::Min(min) => {
                 let ptr = state.latest_block.cheap_clone();
@@ -157,9 +195,18 @@ impl StoreResolver {
                         ),
                     ));
                 }
-                Ok(ptr)
+                let timestamp = get_block_ts(store, &state.latest_block)?;
+
+                Ok(BlockPtrTs { ptr, timestamp })
+            }
+            BlockConstraint::Latest => {
+                let timestamp = get_block_ts(store, &state.latest_block)?;
+
+                Ok(BlockPtrTs {
+                    ptr: state.latest_block.cheap_clone(),
+                    timestamp,
+                })
             }
-            BlockConstraint::Latest => Ok(state.latest_block.cheap_clone()),
         }
     }
 
@@ -180,7 +227,7 @@ impl StoreResolver {
                     // locate_block indicates that we do not have a block hash
                     // by setting the hash to `zero`
                     // See 7a7b9708-adb7-4fc2-acec-88680cb07ec1
-                    let hash_h256 = ptr.hash_as_h256();
+                    let hash_h256 = ptr.ptr.hash_as_h256();
                     if hash_h256 == web3::types::H256::zero() {
                         None
                     } else {
@@ -191,12 +238,21 @@ impl StoreResolver {
             let number = self
                 .block_ptr
                 .as_ref()
-                .map(|ptr| r::Value::Int((ptr.number as i32).into()))
+                .map(|ptr| r::Value::Int((ptr.ptr.number as i32).into()))
                 .unwrap_or(r::Value::Null);
+
+            let timestamp = self.block_ptr.as_ref().map(|ptr| {
+                ptr.timestamp
+                    .clone()
+                    .map(|ts| r::Value::String(ts))
+                    .unwrap_or(r::Value::Null)
+            });
+
             let mut map = BTreeMap::new();
             let block = object! {
                 hash: hash,
                 number: number,
+                timestamp: timestamp,
                 __typename: BLOCK_FIELD_TYPE
             };
             map.insert("prefetch:block".into(), r::Value::List(vec![block]));

graphql/src/subscription/mod.rs

@@ -211,7 +211,7 @@ async fn execute_subscription_event(
         Err(e) => return Arc::new(e.into()),
     };
 
-    let block_ptr = resolver.block_ptr.clone();
+    let block_ptr = resolver.block_ptr.as_ref().map(Into::into);
 
     // Create a fresh execution context with deadline.
     let ctx = Arc::new(ExecutionContext {

store/postgres/src/chain_store.rs

@@ -606,14 +606,14 @@ mod data {
                     b::table
                         .select((b::number, sql(TIMESTAMP_QUERY)))
                         .filter(b::hash.eq(format!("{:x}", hash)))
-                        .first::<(i64, String)>(conn)
+                        .first::<(i64, Option<String>)>(conn)
                         .optional()?
                 }
                 Storage::Private(Schema { blocks, .. }) => blocks
                     .table()
                     .select((blocks.number(), sql(TIMESTAMP_QUERY)))
                     .filter(blocks.hash().eq(hash.as_slice()))
-                    .first::<(i64, String)>(conn)
+                    .first::<(i64, Option<String>)>(conn)
                     .optional()?,
             };
 
@@ -622,7 +622,7 @@ mod data {
                 Some((number, ts)) => {
                     let number = BlockNumber::try_from(number)
                         .map_err(|e| StoreError::QueryExecutionError(e.to_string()))?;
-                    Ok(Some((number, Some(ts))))
+                    Ok(Some((number, ts)))
                 }
             }
         }

store/postgres/src/query_store.rs

@@ -57,8 +57,10 @@ impl QueryStoreTrait for QueryStore {
     async fn block_ptr(&self) -> Result<Option<BlockPtr>, StoreError> {
         self.store.block_ptr(self.site.cheap_clone()).await
     }
-
-    fn block_number(&self, block_hash: &BlockHash) -> Result<Option<BlockNumber>, StoreError> {
+    fn block_number_with_timestamp(
+        &self,
+        block_hash: &BlockHash,
+    ) -> Result<Option<(BlockNumber, Option<String>)>, StoreError> {
         // We should also really check that the block with the given hash is
         // on the chain starting at the subgraph's current head. That check is
         // very expensive though with the data structures we have currently
@@ -68,9 +70,9 @@ impl QueryStoreTrait for QueryStore {
         let subgraph_network = self.network_name();
         self.chain_store
             .block_number(block_hash)?
-            .map(|(network_name, number, _timestamp)| {
+            .map(|(network_name, number, timestamp)| {
                 if network_name == subgraph_network {
-                    Ok(number)
+                    Ok((number, timestamp))
                 } else {
                     Err(StoreError::QueryExecutionError(format!(
                         "subgraph {} belongs to network {} but block {:x} belongs to network {}",
@@ -81,6 +83,11 @@ impl QueryStoreTrait for QueryStore {
             .transpose()
     }
 
+    fn block_number(&self, block_hash: &BlockHash) -> Result<Option<BlockNumber>, StoreError> {
+        self.block_number_with_timestamp(block_hash)
+            .map(|opt| opt.map(|(number, _)| number))
+    }
+
     fn wait_stats(&self) -> Result<PoolWaitStats, StoreError> {
         self.store.wait_stats(self.replica_id)
     }

store/postgres/tests/store.rs

@@ -2015,6 +2015,37 @@ fn parse_timestamp() {
     })
 }
 
+#[test]
+/// checks if retrieving the timestamp from the data blob works.
+/// on ethereum, the block has timestamp as U256 so it will always have a value
+fn parse_null_timestamp() {
+    run_test(|store, _, _| async move {
+        use block_store::*;
+        // The test subgraph is at block 2. Since we don't ever delete
+        // the genesis block, the only block eligible for cleanup is BLOCK_ONE
+        // and the first retained block is block 2.
+        block_store::set_chain(
+            vec![
+                &*GENESIS_BLOCK,
+                &*BLOCK_ONE,
+                &*BLOCK_TWO,
+                &*BLOCK_THREE_NO_TIMESTAMP,
+            ],
+            NETWORK_NAME,
+        );
+        let chain_store = store
+            .block_store()
+            .chain_store(NETWORK_NAME)
+            .expect("fake chain store");
+
+        let (_network, number, timestamp) = chain_store
+            .block_number(&BLOCK_THREE_NO_TIMESTAMP.block_hash())
+            .expect("block_number to return correct number and timestamp")
+            .unwrap();
+        assert_eq!(number, 3);
+        assert_eq!(true, timestamp.is_none());
+    })
+}
 #[test]
 fn reorg_tracking() {
     async fn update_john(

store/test-store/src/block_store.rs

@@ -33,6 +33,9 @@ lazy_static! {
     pub static ref BLOCK_THREE: FakeBlock = BLOCK_TWO.make_child("7347afe69254df06729e123610b00b8b11f15cfae3241f9366fb113aec07489c", None);
     pub static ref BLOCK_THREE_NO_PARENT: FakeBlock = FakeBlock::make_no_parent(3, "fa9ebe3f74de4c56908b49f5c4044e85825f7350f3fa08a19151de82a82a7313");
     pub static ref BLOCK_THREE_TIMESTAMP: FakeBlock = BLOCK_TWO.make_child("6b834521bb753c132fdcf0e1034803ed9068e324112f8750ba93580b393a986b", Some(U256::from(1657712166)));
+    // This block is special and serializes in a slightly different way, this is needed to simulate non-ethereum behaviour at the store level. If you're not sure
+    // what you are doing, don't use this block for other tests.
+    pub static ref BLOCK_THREE_NO_TIMESTAMP: FakeBlock = BLOCK_TWO.make_child("6b834521bb753c132fdcf0e1034803ed9068e324112f8750ba93580b393a986b", None);
     pub static ref BLOCK_FOUR: FakeBlock = BLOCK_THREE.make_child("7cce080f5a49c2997a6cc65fc1cee9910fd8fc3721b7010c0b5d0873e2ac785e", None);
     pub static ref BLOCK_FIVE: FakeBlock = BLOCK_FOUR.make_child("7b0ea919e258eb2b119eb32de56b85d12d50ac6a9f7c5909f843d6172c8ba196", None);
     pub static ref BLOCK_SIX_NO_PARENT: FakeBlock = FakeBlock::make_no_parent(6, "6b834521bb753c132fdcf0e1034803ed9068e324112f8750ba93580b393a986b");
@@ -112,7 +115,23 @@ impl Block for FakeBlock {
     }
 
     fn data(&self) -> Result<serde_json::Value, serde_json::Error> {
-        serde_json::to_value(self.as_ethereum_block())
+        let mut value: serde_json::Value = serde_json::to_value(self.as_ethereum_block())?;
+        if !self.eq(&BLOCK_THREE_NO_TIMESTAMP) {
+            return Ok(value);
+        };
+
+        // Remove the timestamp for block BLOCK_THREE_NO_TIMESTAMP in order to simulate the non EVM behaviour
+        // In these cases timestamp is not there at all but LightEthereumBlock uses U256 as timestamp so it
+        // can never be null and therefore impossible to test without manipulating the JSON blob directly.
+        if let serde_json::Value::Object(ref mut map) = value {
+            map.entry("block").and_modify(|ref mut block| {
+                if let serde_json::Value::Object(ref mut block) = block {
+                    block.remove_entry("timestamp");
+                }
+            });
+        };
+
+        Ok(value)
     }
 }