Some cleanup on the index page

I hardly believe it myself, but this "just werkded" (TM) the first time

src/lib.rs

@@ -1,9 +1,10 @@
-use chrono::prelude::*;
+use chrono::{prelude::*, TimeDelta};
 use lazy_static::lazy_static;
 use rocket::serde::Serialize;
 use std::convert::Into;
 use std::sync::RwLock;
 use serde_with::{serde_as, DisplayFromStr};
+use std::str::FromStr;
 
 pub enum BlockchainSupported {
     BTC,
@@ -12,6 +13,19 @@ pub enum BlockchainSupported {
     ETH,
 }
 
+impl FromStr for BlockchainSupported {
+    type Err = String;
+    fn from_str(val: &str) -> Result<Self, Self::Err> {
+        match val {
+            "BTC" => Ok(BlockchainSupported::BTC),
+            "BSV" => Ok(BlockchainSupported::BSV),
+            "XMR" => Ok(BlockchainSupported::XMR),
+            "ETH" => Ok(BlockchainSupported::ETH),
+            _ => Err("You picked an unsupported blockchain type! Create a patch and I'll probably accept it!".to_string())
+        }
+    }
+}
+
 type BlockHeight = i64;
 
 #[serde_as]
@@ -71,6 +85,18 @@ pub fn time_to_blockheight(time: DateTime<Utc>, bi: BlockchainInfo) -> BlockHeig
     num_blocks + bi.latest_block_height
 }
 
+pub fn blockheight_specific_chain_to_time(height: BlockHeight, blockchain: BlockchainSupported) -> DateTime<Utc> {
+    let bi: BlockchainInfo = blockchain.into();
+    blockheight_to_time(height, bi)
+}
+
+#[deprecated = "The output of this function (Date & Time) will eventually be redundant, please look to change your own time keeping system to the superior blocktime as set out in this repository"]
+pub fn blockheight_to_time(height: BlockHeight, bi: BlockchainInfo) -> DateTime<Utc> {
+    // TODO check the + and - are the right way around
+    let diff_seconds = (height - bi.latest_block_height) * bi.block_period as i64;
+    bi.latest_block_time + TimeDelta::seconds(diff_seconds)
+}
+
 // I know there's code duplication... I _could_ abstract it out.
 // I think it's probably very YAGNI
 
@@ -170,8 +196,9 @@ pub fn update_all_blockheights() {
 
 #[cfg(test)]
 mod tests {
+    use chrono::TimeDelta;
+
     use super::*;
-    use chrono::Duration;
 
     #[test]
     #[ignore]
@@ -230,6 +257,22 @@ mod tests {
         assert_eq!(result, 1001);
     }
 
+    #[test]
+    fn back_and_forth() {
+        let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 10, 0).unwrap();
+        let wanted_future_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 20, 1).unwrap();
+        let blockchain_info = BlockchainInfo {
+            block_period: 60 * 10, // 10 minutes
+            latest_block_height: 1000,
+            latest_block_time,
+        };
+        let result = time_to_blockheight(wanted_future_block_time, blockchain_info);
+        assert_eq!(result, 1001);
+        let future_time = blockheight_to_time(1001, blockchain_info);
+        assert_eq!(future_time, Utc.with_ymd_and_hms(2024, 10, 10, 10, 20, 0).unwrap());
+        // ignore the missing second... that second will not be needed in the future
+    }
+
     #[test]
     fn one_block_time_previous() {
         let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 20, 1).unwrap();
@@ -261,23 +304,23 @@ mod tests {
         // Doesn't feel like an overly good test - but I can't think of anyother way that's "dynamic"
         // to me manually updating the times above
         let bi: BlockchainInfo = BlockchainSupported::BTC.into();
-        let wanted_time = bi.latest_block_time + Duration::seconds(bi.block_period as i64 + 1);
+        let wanted_time = bi.latest_block_time + TimeDelta::seconds(bi.block_period as i64 + 1);
         let bh = time_to_blockheight_specific_chain(wanted_time, BlockchainSupported::BTC);
         assert_eq!(bh, bi.latest_block_height + 1);
         let bi: BlockchainInfo = BlockchainSupported::BSV.into();
-        let wanted_time = bi.latest_block_time + Duration::seconds(bi.block_period as i64 + 2);
+        let wanted_time = bi.latest_block_time + TimeDelta::seconds(bi.block_period as i64 + 2);
         let bh = time_to_blockheight_specific_chain(wanted_time, BlockchainSupported::BSV);
         assert_eq!(bh, bi.latest_block_height + 1);
         let bi: BlockchainInfo = BlockchainSupported::XMR.into();
-        let wanted_time = bi.latest_block_time + Duration::seconds(bi.block_period as i64 + 3);
+        let wanted_time = bi.latest_block_time + TimeDelta::seconds(bi.block_period as i64 + 3);
         let bh = time_to_blockheight_specific_chain(wanted_time, BlockchainSupported::XMR);
         assert_eq!(bh, bi.latest_block_height + 1);
         let bi: BlockchainInfo = BlockchainSupported::ETH.into();
-        let wanted_time = bi.latest_block_time + Duration::seconds(bi.block_period as i64 + 4);
+        let wanted_time = bi.latest_block_time + TimeDelta::seconds(bi.block_period as i64 + 4);
         let bh = time_to_blockheight_specific_chain(wanted_time, BlockchainSupported::ETH);
         assert_eq!(bh, bi.latest_block_height + 1);
         let bi: BlockchainInfo = BlockchainSupported::ETH.into();
-        let wanted_time = bi.latest_block_time + Duration::seconds(bi.block_period as i64 + 5);
+        let wanted_time = bi.latest_block_time + TimeDelta::seconds(bi.block_period as i64 + 5);
         let bh = time_to_blockheight_specific_chain(wanted_time, BlockchainSupported::XMR);
         assert_ne!(bh, bi.latest_block_height + 1);
     }

src/main.rs

@@ -1,6 +1,6 @@
 #[macro_use] extern crate rocket;
 use rocket_dyn_templates::{context, Template};
-use blockchain_time::{BlockchainInfo, BlockchainSupported, update_all_blockheights, time_to_blockheight_specific_chain};
+use blockchain_time::{BlockchainInfo, BlockchainSupported, update_all_blockheights, time_to_blockheight_specific_chain, blockheight_specific_chain_to_time};
 use chrono::prelude::*;
 
 #[get("/")]
@@ -32,8 +32,8 @@ fn to_blockchain_time(input_datetime: &str) -> Template {
             dt.and_utc()
         },
         Err(e) => {
-            println!("error: {}", e);
-            panic!();
+            let err_string = format!{"{}", e};
+            return Template::render("error", context!{ error: err_string });
         }
     };
     let blocktimes = vec!{
@@ -45,12 +45,26 @@ fn to_blockchain_time(input_datetime: &str) -> Template {
     let context = context!{
         blocktimes
     };
-    println!("{:?}", context);
     Template::render("blockchain_time_results", context)
 }
 
+#[get("/to_obsolete_time?<blockheight>&<blockchain>")]
+fn to_obsolete_time(blockheight: i64, blockchain: &str) -> Template {
+    let blockchain: Result<BlockchainSupported, String> = blockchain.parse();
+    let blockchain = match blockchain {
+        Ok(bl) => bl,
+        Err(err) => {
+            return Template::render("error", context!{ error: err });
+        }
+    };
+    let context = context! {
+        time: blockheight_specific_chain_to_time(blockheight, blockchain)
+    };
+    Template::render("obsolete_time", context)
+}
+
 #[launch]
 fn rocket() -> _ {
-    rocket::build().mount("/", routes![index, update_blockchains, to_blockchain_time])
+    rocket::build().mount("/", routes![index, update_blockchains, to_blockchain_time, to_obsolete_time])
         .attach(Template::fairing())
 }

templates/error.html.tera

@@ -0,0 +1,11 @@
+{% extends "base" %}
+{% block content %}
+<h1>Error!</h1>
+<p>Error: <span class="result">{{ error }}</span></p>
+
+<p>I don't know what you did</p>
+<p>Maybe that error above will make sense to you, maybe not</p>
+<p>It's probably because you up a wrong DateTime in</p>
+<p>Don't forget to put a time in - I don't know how to enforce this with HTML</p>
+<p><a href="/">Please try again</a></p>
+{% endblock content %}

templates/index.html.tera

@@ -3,16 +3,26 @@
     <h1>Welcome to Blockchain Time</h1><p>A.K.A. Big Tim</p>
     <div>
       <h2>Convert to Blockchain Time</h2>
-      <form id="form" method="GET" action="to_blockchain_time">
+      <form id="to_blocktmie" method="GET" action="to_blockchain_time">
         <label for="input_datetime">Input DateTime (in UTC only currently)</label>
         <input type="datetime-local" id="input_datetime" name="input_datetime">
         <input type="submit" value="Submit">
       </form>
     </div>
     <div>
-      <h2>Convert from Blockchain Time</h2>
-      <p><b>Booo</b> why are you going this way??? Don't you know your blocktimes??</p>
-      <p><b><i><a href="#">UNIMPLEMENTED</a></i></b></p>
+      <h2 title="Boooooooo">Convert from Blockchain Time</h2>
+      <form id="to_obsolete_time" method="GET" action="to_obsolete_time">
+        <label for="blockheight">Input Block Height</label>
+        <input type="int" id="blockheight" name="blockheight" value="{{blockchain_infos[0][1].latest_block_height}}">
+        <label for="blockchain">Blockchain</label>
+        <select if="blockchain" name="blockchain">
+          <option value="BSV">BSV</option>
+          <option value="BTC">BTC</option>
+          <option value="XMR">XMR</option>
+          <option value="ETH">ETH</option>
+        </select>
+        <input type="submit" value="I'm a weenie that doesn't know my blocktimes">
+      </form>
     </div>
     <div class="cur_blocks">
       <h2>Latest Block Heights and Times Cached</h2>

templates/obsolete_time.html.tera

@@ -0,0 +1,7 @@
+{% extends "base" %}
+{% block content %}
+<h1>BOOOOOOOOOOOOOOOOOOO</h1>
+<h6>here's your obsolete time, in UTC, because timezones are boring to get correct, and no longer needed in the new blocktime order</h6>
+<p class="result">{{time}}</p>
+<p>Why don't you go back <a href="/">home</a> and try another thing</p>
+{% endblock content %}