feature: txhashset downloading progress display on tui (#1729)

src/bin/tui/status.rs

@@ -14,6 +14,7 @@
 
 //! Basic status view definition
 
+use chrono::prelude::Utc;
 use cursive::direction::Orientation;
 use cursive::traits::Identifiable;
 use cursive::view::View;
@@ -26,6 +27,8 @@ use tui::types::TUIStatusListener;
 use servers::common::types::SyncStatus;
 use servers::ServerStats;
 
+const NANO_TO_MILLIS: f64 = 1.0 / 1_000_000.0;
+
 pub struct TUIStatusView;
 
 impl TUIStatusListener for TUIStatusView {
@@ -101,8 +104,35 @@ impl TUIStatusListener for TUIStatusView {
 						};
 						format!("Downloading headers: {}%, step 1/4", percent)
 					}
-					SyncStatus::TxHashsetDownload => {
-						"Downloading chain state for fast sync, step 2/4".to_string()
+					SyncStatus::TxHashsetDownload {
+						start_time,
+						downloaded_size,
+						total_size,
+					} => {
+						if total_size > 0 {
+							let percent = if total_size > 0 {
+								downloaded_size * 100 / total_size
+							} else {
+								0
+							};
+							let start = start_time.timestamp_nanos();
+							let fin = Utc::now().timestamp_nanos();
+							let dur_ms = (fin - start) as f64 * NANO_TO_MILLIS;
+
+							format!("Downloading {}(MB) chain state for fast sync: {}% at {:.1?}(kB/s), step 2/4",
+									total_size / 1_000_000,
+									percent,
+									if dur_ms > 1.0f64 { downloaded_size as f64 / dur_ms as f64 } else { 0f64 },
+							)
+						} else {
+							let start = start_time.timestamp_millis();
+							let fin = Utc::now().timestamp_millis();
+							let dur_secs = (fin - start) / 1000;
+
+							format!("Downloading chain state for fast sync. Waiting remote peer to start: {}s, step 2/4",
+									dur_secs,
+							)
+						}
 					}
 					SyncStatus::TxHashsetSetup => {
 						"Preparing chain state for validation, step 3/4".to_string()