Implemented tracking of the height during committing of the changes.

The `Database` is responsible for its updating and tracking.

benches/benches/block_target_gas.rs

@@ -256,7 +256,7 @@ fn service_with_many_contracts(
         .build()
         .unwrap();
     let _drop = rt.enter();
-    let mut database = Database::rocksdb();
+    let mut database = Database::rocksdb_temp();
     let mut config = Config::local_node();
     config
         .chain_conf

crates/database/src/lib.rs

@@ -21,12 +21,6 @@ pub enum Error {
     /// Error occurred during serialization or deserialization of the entity.
     #[display(fmt = "error performing serialization or deserialization")]
     Codec,
-    /// Chain can be initialized once.
-    #[display(fmt = "Failed to initialize chain")]
-    ChainAlreadyInitialized,
-    /// Chain should be initialized before usage.
-    #[display(fmt = "Chain is not yet initialized")]
-    ChainUninitialized,
     /// The version of database or data is invalid (possibly not migrated).
     #[display(
         fmt = "Invalid database version, expected {expected:#x}, found {found:#x}"
@@ -37,6 +31,33 @@ pub enum Error {
         /// the database version expected by this build of fuel-core
         expected: u32,
     },
+    /// Multiple heights found in the commit to teh database.
+    #[display(fmt = "Multiple heights found in the commit {heights:?}")]
+    MultipleHeightsInCommit {
+        /// List of heights found in the commit.
+        heights: Vec<u64>,
+    },
+    /// Failed to advance the height.
+    #[display(fmt = "Failed to advance the height")]
+    FailedToAdvanceHeight,
+    /// The new and old heights are not linked.
+    #[display(
+        fmt = "New and old heights are not linked: prev_height: {prev_height:#x}, new_height: {new_height:#x}"
+    )]
+    HeightsAreNotLinked {
+        /// The old height.
+        prev_height: u64,
+        /// The new height.
+        new_height: u64,
+    },
+    /// The new height is not found, but the old height is set.
+    #[display(
+        fmt = "The new height is not found, but the old height is set: prev_height: {prev_height:#x}"
+    )]
+    NewHeightIsNotSet {
+        /// The old height known by the database.
+        prev_height: u64,
+    },
 
     /// Not related to database error.
     #[from]

crates/fuel-core/src/combined_database.rs

@@ -7,10 +7,6 @@ use crate::database::{
     Database,
 };
 use fuel_core_storage::Result as StorageResult;
-use fuel_core_types::{
-    blockchain::primitives::DaBlockHeight,
-    fuel_types::BlockHeight,
-};
 
 /// A database that combines the on-chain, off-chain and relayer databases into one entity.
 #[derive(Default, Clone)]
@@ -57,14 +53,10 @@ impl CombinedDatabase {
         )
     }
 
-    pub fn init(
-        &mut self,
-        block_height: &BlockHeight,
-        da_block_height: &DaBlockHeight,
-    ) -> StorageResult<()> {
-        self.on_chain.init(block_height)?;
-        self.off_chain.init(block_height)?;
-        self.relayer.init(da_block_height)?;
+    pub fn check_version(&self) -> StorageResult<()> {
+        self.on_chain.check_version()?;
+        self.off_chain.check_version()?;
+        self.relayer.check_version()?;
         Ok(())
     }