Introduce state to track sync stages (#1210) (#1211)

* A new sync status enum encapsulated in a state struct allows tracking of where sync is at. Leveraging it in the TUI to provide more helpful messages.
* Percentage progression for most sync steps

src/bin/tui/status.rs

@@ -23,6 +23,7 @@ use cursive::views::{BoxView, LinearLayout, TextView};
 use tui::constants::VIEW_BASIC_STATUS;
 use tui::types::TUIStatusListener;
 
+use servers::common::types::SyncStatus;
 use servers::ServerStats;
 
 pub struct TUIStatusView;
@@ -76,14 +77,63 @@ impl TUIStatusListener for TUIStatusView {
 	fn update(c: &mut Cursive, stats: &ServerStats) {
 		//find and update here as needed
 		let basic_status = {
-			if stats.is_syncing {
-				if stats.awaiting_peers {
-					"Waiting for peers".to_string()
-				} else {
-					format!("Syncing - Latest header: {}", stats.header_head.height).to_string()
-				}
+			if stats.awaiting_peers {
+				"Waiting for peers".to_string()
 			} else {
-				"Running".to_string()
+				match stats.sync_status {
+					SyncStatus::NoSync => "Running".to_string(),
+					SyncStatus::HeaderSync {
+						current_height,
+						highest_height,
+					} => {
+						let percent = if highest_height == 0 {
+							0
+						} else {
+							current_height * 100 / highest_height
+						};
+						format!("Downloading headers: {}%, step 1/4", percent)
+					}
+					SyncStatus::TxHashsetDownload => {
+						"Downloading chain state for fast sync, step 2/4".to_string()
+					}
+					SyncStatus::TxHashsetSetup => {
+						"Preparing chain state for validation, step 3/4".to_string()
+					}
+					SyncStatus::TxHashsetValidation {
+						kernels,
+						kernel_total,
+						rproofs,
+						rproof_total,
+					} => {
+						// 10% of overall progress is attributed to kernel validation
+						// 90% to range proofs (which are much longer)
+						let mut percent = if kernel_total > 0 {
+							kernels * 10 / kernel_total
+						} else {
+							0
+						};
+						percent += if rproof_total > 0 {
+							rproofs * 90 / rproof_total
+						} else {
+							0
+						};
+						format!("Validating chain state: {}%, step 3/4", percent)
+					}
+					SyncStatus::TxHashsetSave => {
+						"Finalizing chain state for fast sync, step 3/4".to_string()
+					}
+					SyncStatus::BodySync {
+						current_height,
+						highest_height,
+					} => {
+						let percent = if highest_height == 0 {
+							0
+						} else {
+							current_height * 100 / highest_height
+						};
+						format!("Downloading blocks: {}%, step 4/4", percent)
+					}
+				}
 			}
 		};
 		/*let basic_mining_config_status = {