Add epoch subcommand (#9249)

automerge

cli/src/cluster_query.rs

@@ -117,6 +117,17 @@ impl ClusterQuerySubCommands for App<'_, '_> {
                     ),
             ),
         )
+        .subcommand(
+            SubCommand::with_name("epoch").about("Get current epoch")
+            .arg(
+                Arg::with_name("confirmed")
+                    .long("confirmed")
+                    .takes_value(false)
+                    .help(
+                        "Return epoch at maximum-lockout commitment level",
+                    ),
+            ),
+        )
         .subcommand(
             SubCommand::with_name("total-supply").about("Get total number of SOL")
             .arg(
@@ -334,6 +345,18 @@ pub fn parse_get_slot(matches: &ArgMatches<'_>) -> Result<CliCommandInfo, CliErr
     })
 }
 
+pub fn parse_get_epoch(matches: &ArgMatches<'_>) -> Result<CliCommandInfo, CliError> {
+    let commitment_config = if matches.is_present("confirmed") {
+        CommitmentConfig::default()
+    } else {
+        CommitmentConfig::recent()
+    };
+    Ok(CliCommandInfo {
+        command: CliCommand::GetEpoch { commitment_config },
+        signers: vec![],
+    })
+}
+
 pub fn parse_total_supply(matches: &ArgMatches<'_>) -> Result<CliCommandInfo, CliError> {
     let commitment_config = if matches.is_present("confirmed") {
         CommitmentConfig::default()
@@ -613,6 +636,14 @@ pub fn process_get_slot(
     Ok(slot.to_string())
 }
 
+pub fn process_get_epoch(
+    rpc_client: &RpcClient,
+    commitment_config: CommitmentConfig,
+) -> ProcessResult {
+    let epoch_info = rpc_client.get_epoch_info_with_commitment(commitment_config.clone())?;
+    Ok(epoch_info.epoch.to_string())
+}
+
 pub fn parse_show_block_production(matches: &ArgMatches<'_>) -> Result<CliCommandInfo, CliError> {
     let epoch = value_t!(matches, "epoch", Epoch).ok();
     let slot_limit = value_t!(matches, "slot_limit", u64).ok();
@@ -1326,6 +1357,19 @@ mod tests {
             }
         );
 
+        let test_get_epoch = test_commands
+            .clone()
+            .get_matches_from(vec!["test", "epoch"]);
+        assert_eq!(
+            parse_command(&test_get_epoch, &default_keypair_file, None).unwrap(),
+            CliCommandInfo {
+                command: CliCommand::GetEpoch {
+                    commitment_config: CommitmentConfig::recent(),
+                },
+                signers: vec![],
+            }
+        );
+
         let test_total_supply = test_commands
             .clone()
             .get_matches_from(vec!["test", "total-supply"]);