Storage chains part 1 (#7868)

* CLI options and DB upgrade

* Transaction storage

* Block pruning

* Block pruning test

* Style

* Naming

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Style

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/client/cli/src/params/pruning_params.rs

@@ -17,7 +17,7 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 use crate::error;
-use sc_service::{PruningMode, Role};
+use sc_service::{PruningMode, Role, KeepBlocks};
 use structopt::StructOpt;
 
 /// Parameters to define the pruning mode
@@ -30,11 +30,16 @@ pub struct PruningParams {
 	/// 256 blocks.
 	#[structopt(long = "pruning", value_name = "PRUNING_MODE")]
 	pub pruning: Option<String>,
+	/// Specify the number of finalized blocks to keep in the database.
+	///
+	/// Default is to keep all blocks.
+	#[structopt(long, value_name = "COUNT")]
+	pub keep_blocks: Option<u32>,
 }
 
 impl PruningParams {
 	/// Get the pruning value from the parameters
-	pub fn pruning(&self, unsafe_pruning: bool, role: &Role) -> error::Result<PruningMode> {
+	pub fn state_pruning(&self, unsafe_pruning: bool, role: &Role) -> error::Result<PruningMode> {
 		// by default we disable pruning if the node is an authority (i.e.
 		// `ArchiveAll`), otherwise we keep state for the last 256 blocks. if the
 		// node is an authority and pruning is enabled explicitly, then we error
@@ -58,4 +63,12 @@ impl PruningParams {
 			}
 		})
 	}
+
+	/// Get the block pruning value from the parameters
+	pub fn keep_blocks(&self) -> error::Result<KeepBlocks> {
+		Ok(match self.keep_blocks {
+			Some(n) => KeepBlocks::Some(n),
+			None => KeepBlocks::All,
+		})
+	}
 }