From 9aa284536652612e3db74d16dc69d241791bc6ea Mon Sep 17 00:00:00 2001
From: Mike Dilger <mike@mikedilger.com>
Date: Fri, 30 Dec 2022 07:56:59 +1300
Subject: [PATCH] POW setting for your posts [This currently blocks the
 overlord while it's computing PoW]

---
 src/overlord/mod.rs |  8 ++++++--
 src/settings.rs     | 10 ++++++++--
 src/signer.rs       |  7 +++++--
 src/ui/settings.rs  | 12 ++++++++++++
 4 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/src/overlord/mod.rs b/src/overlord/mod.rs
index 5a819760..17db4787 100644
--- a/src/overlord/mod.rs
+++ b/src/overlord/mod.rs
@@ -668,7 +668,9 @@ impl Overlord {
                 ots: None,
             };
 
-            GLOBALS.signer.read().await.sign_preevent(pre_event)?
+            let powint = GLOBALS.settings.read().await.pow;
+            let pow = if powint > 0 { Some(powint) } else { None };
+            GLOBALS.signer.read().await.sign_preevent(pre_event, pow)?
         };
 
         let relays: Vec<DbRelay> = GLOBALS
@@ -724,7 +726,9 @@ impl Overlord {
                 ots: None,
             };
 
-            GLOBALS.signer.read().await.sign_preevent(pre_event)?
+            let powint = GLOBALS.settings.read().await.pow;
+            let pow = if powint > 0 { Some(powint) } else { None };
+            GLOBALS.signer.read().await.sign_preevent(pre_event, pow)?
         };
 
         let relays: Vec<DbRelay> = GLOBALS
diff --git a/src/settings.rs b/src/settings.rs
index e4c440eb..90b186ba 100644
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -14,6 +14,7 @@ pub const DEFAULT_NUM_RELAYS_PER_PERSON: u8 = 2;
 pub const DEFAULT_MAX_RELAYS: u8 = 15;
 pub const DEFAULT_MAX_FPS: u32 = 60;
 pub const DEFAULT_FEED_RECOMPUTE_INTERVAL_MS: u32 = 1000;
+pub const DEFAULT_POW: u8 = 0;
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Settings {
@@ -29,6 +30,7 @@ pub struct Settings {
     pub encrypted_private_key: Option<EncryptedPrivateKey>,
     pub max_fps: u32,
     pub feed_recompute_interval_ms: u32,
+    pub pow: u8,
 }
 
 impl Default for Settings {
@@ -46,6 +48,7 @@ impl Default for Settings {
             encrypted_private_key: None,
             max_fps: DEFAULT_MAX_FPS,
             feed_recompute_interval_ms: DEFAULT_FEED_RECOMPUTE_INTERVAL_MS,
+            pow: DEFAULT_POW,
         }
     }
 }
@@ -102,6 +105,7 @@ impl Settings {
                         .parse::<u32>()
                         .unwrap_or(DEFAULT_FEED_RECOMPUTE_INTERVAL_MS)
                 }
+                "pow" => settings.pow = row.1.parse::<u8>().unwrap_or(DEFAULT_POW),
                 _ => {}
             }
         }
@@ -117,8 +121,9 @@ impl Settings {
             "REPLACE INTO settings (key, value) VALUES \
                                    ('feed_chunk', ?),('overlap', ?),('autofollow', ?),\
                                    ('view_posts_referred_to', ?),('view_posts_referring_to', ?),\
-                                   ('view_threaded', ?),('num_relays_per_person', ?), \
-                                   ('max_relays', ?),('max_fps', ?),('feed_recompute_interval_ms', ?)",
+                                   ('view_threaded', ?),('num_relays_per_person', ?),\
+                                   ('max_relays', ?),('max_fps', ?),('feed_recompute_interval_ms', ?),\
+                                   ('pow', ?)",
         )?;
         stmt.execute((
             self.feed_chunk,
@@ -139,6 +144,7 @@ impl Settings {
             self.max_relays,
             self.max_fps,
             self.feed_recompute_interval_ms,
+            self.pow,
         ))?;
 
         // Save private key identity
diff --git a/src/signer.rs b/src/signer.rs
index 65b52710..5889f6f2 100644
--- a/src/signer.rs
+++ b/src/signer.rs
@@ -58,9 +58,12 @@ impl Signer {
     }
 
     #[allow(dead_code)]
-    pub fn sign_preevent(&self, preevent: PreEvent) -> Result<Event, Error> {
+    pub fn sign_preevent(&self, preevent: PreEvent, pow: Option<u8>) -> Result<Event, Error> {
         match self {
-            Signer::Ready(pk) => Ok(Event::new(preevent, pk)?),
+            Signer::Ready(pk) => match pow {
+                Some(pow) => Ok(Event::new_with_pow(preevent, pk, pow)?),
+                None => Ok(Event::new(preevent, pk)?),
+            },
             _ => Err(Error::NoPrivateKey),
         }
     }
diff --git a/src/ui/settings.rs b/src/ui/settings.rs
index 454b9c85..b6013934 100644
--- a/src/ui/settings.rs
+++ b/src/ui/settings.rs
@@ -90,6 +90,18 @@ pub(super) fn update(
     ui.separator();
     ui.add_space(12.0);
 
+    ui.heading("Posting");
+
+    ui.horizontal(|ui| {
+        ui.label("Proof of Work: ")
+            .on_hover_text("The larger the number, the longer it takes.");
+        ui.add(Slider::new(&mut app.settings.pow, 0..=40).text("leading zeroes"));
+    });
+
+    ui.add_space(12.0);
+    ui.separator();
+    ui.add_space(12.0);
+
     ui.heading("User Interface");
 
     ui.horizontal(|ui| {