log price update

Author: DaSichuan

token-lending/program/src/lib.rs

@@ -5,6 +5,7 @@
 pub mod entrypoint;
 pub mod error;
 pub mod instruction;
+pub mod logs;
 pub mod math;
 pub mod processor;
 pub mod pyth;

token-lending/program/src/logs.rs

@@ -0,0 +1,73 @@
+#![allow(missing_docs)]
+use solana_program::{
+    msg,
+    pubkey::Pubkey,
+};
+use std::{fmt};
+use crate::{
+    pyth,
+    math::{Decimal},
+};
+
+
+#[derive(Debug)]
+enum LogEventType {
+    PythOraclePriceUpdateType,
+    SwitchboardV1OraclePriceUpdateType,
+}
+
+impl fmt::Display for LogEventType{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}
+
+pub fn emit_log_event(e: &dyn LogEvent) {
+    msg!("Solend Log Event");
+    msg!(&e.to_string());
+}
+
+
+pub trait LogEvent {
+    fn to_string(&self) -> String;
+}
+
+pub struct PythOraclePriceUpdate {
+    oracle_pubkey: Pubkey,
+    price: i64,
+    conf: u64,
+    status: pyth::PriceStatus,
+    published_slot: u64,
+}
+
+impl LogEvent for PythOraclePriceUpdate {
+    fn to_string(&self) -> String {
+        return format!(
+            "{},{},{},{},{},{}", 
+            LogEventType::PythOraclePriceUpdateType.to_string(),
+            self.oracle_pubkey.to_string(),
+            self.price.to_string(),
+            self.conf.to_string(),
+            self.status.to_string(),
+            self.published_slot,
+        );
+    }
+}
+
+pub struct SwitchboardV1OraclePriceUpdate {
+    oracle_pubkey: Pubkey,
+    price: Decimal,
+    published_slot: u64,
+}
+
+impl LogEvent for SwitchboardV1OraclePriceUpdate {
+    fn to_string(&self) -> String {
+        return format!(
+            "{},{},{},{}", 
+            LogEventType::SwitchboardV1OraclePriceUpdateType.to_string(),
+            self.oracle_pubkey.to_string(),
+            self.price.to_string(),
+            self.published_slot,
+        );
+    }
+}

token-lending/program/src/processor.rs

@@ -4,6 +4,7 @@ use crate::{
     self as spl_token_lending,
     error::LendingError,
     instruction::LendingInstruction,
+    logs::{emit_log_event},
     math::{Decimal, Rate, TryAdd, TryDiv, TryMul, TrySub, WAD},
     pyth,
     state::{

token-lending/program/src/pyth.rs

@@ -4,7 +4,10 @@ use bytemuck::{
     cast_slice, cast_slice_mut, from_bytes, from_bytes_mut, try_cast_slice, try_cast_slice_mut,
     Pod, PodCastError, Zeroable,
 };
-use std::mem::size_of;
+use std::{
+    mem::size_of,
+    fmt,
+};
 
 pub const MAGIC: u32 = 0xa1b2c3d4;
 pub const VERSION_2: u32 = 2;
@@ -29,7 +32,7 @@ pub enum AccountType {
     Price,
 }
 
-#[derive(PartialEq, Copy, Clone)]
+#[derive(PartialEq, Copy, Clone, Debug)]
 #[repr(C)]
 pub enum PriceStatus {
     Unknown,
@@ -38,6 +41,13 @@ pub enum PriceStatus {
     Auction,
 }
 
+impl fmt::Display for PriceStatus{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}
+
+
 #[derive(PartialEq, Copy, Clone)]
 #[repr(C)]
 pub enum CorpAction {