feat: add solana target chain example (#1446)

* feat: add send usd example for solana

* fix: rust fmt

* fix: remove unused dependency ahash

* fix: imports

* refactor: use get_price_no_older_than

* fix: package name

* fix: fix naming conventions

* feat: add workspace members in Anchor.toml

* fix: set maximum age to 1 hour

* fix: use public crates for send usd example

Author: keyvankhademi

target_chains/solana/Anchor.toml

@@ -1,3 +1,10 @@
+[workspace]
+members = [
+    "programs/pyth-push-oracle",
+    "programs/pyth-solana-receiver",
+    "examples/send_usd",
+]
+
 [features]
 seeds = false
 skip-lint = false

target_chains/solana/Cargo.lock

@@ -4,7 +4,8 @@ members = [
     "cli/",
     "program_simulator/",
     "pyth_solana_receiver_sdk/",
-    "common_test_utils"
+    "common_test_utils",
+    "examples/send_usd"
 ]
 
 [profile.release]

target_chains/solana/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "send-usd"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "send_usd"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.28.0"
+solana-program = "1.16.20"
+pyth-solana-receiver-sdk = "0.1.0"

target_chains/solana/examples/send_usd/Cargo.toml

@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

target_chains/solana/examples/send_usd/Xargo.toml

@@ -0,0 +1,67 @@
+use {
+    anchor_lang::{
+        prelude::*,
+        solana_program::{
+            native_token::LAMPORTS_PER_SOL,
+            system_instruction,
+        },
+    },
+    pyth_solana_receiver_sdk::price_update::{
+        get_feed_id_from_hex,
+        PriceUpdateV2,
+    },
+};
+
+declare_id!("2e5gZD3suxgJgkCg4pkoogxDKszy1SAwokz8mNeZUj4M");
+
+pub const MAXIMUM_AGE: u64 = 3600; // 1 hour
+pub const FEED_ID: &str = "0xef0d8b6fda2ceba41da15d4095d1da392a0d2f8ed0c6c7bc0f4cfac8c280b56d";
+
+#[program]
+pub mod send_usd {
+    use super::*;
+
+    pub fn send(ctx: Context<Send>, amount_in_usd: u64) -> Result<()> {
+        let price_update = &mut ctx.accounts.price_update;
+        let price = price_update.get_price_no_older_than(
+            &Clock::get()?,
+            MAXIMUM_AGE,
+            &get_feed_id_from_hex(FEED_ID)?,
+        )?;
+
+        let amount_in_lamports = LAMPORTS_PER_SOL
+            .checked_mul(10_u64.pow(price.exponent.abs().try_into().unwrap()))
+            .unwrap()
+            .checked_mul(amount_in_usd)
+            .unwrap()
+            .checked_div(price.price.try_into().unwrap())
+            .unwrap();
+
+        let transfer_instruction = system_instruction::transfer(
+            ctx.accounts.payer.key,
+            ctx.accounts.destination.key,
+            amount_in_lamports,
+        );
+        anchor_lang::solana_program::program::invoke(
+            &transfer_instruction,
+            &[
+                ctx.accounts.payer.to_account_info(),
+                ctx.accounts.destination.to_account_info(),
+            ],
+        )?;
+
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+#[instruction(amount_in_usd : u64)]
+pub struct Send<'info> {
+    #[account(mut)]
+    pub payer:          Signer<'info>,
+    #[account(mut)]
+    /// CHECK : Just a destination
+    pub destination:    AccountInfo<'info>,
+    pub price_update:   Account<'info, PriceUpdateV2>,
+    pub system_program: Program<'info, System>,
+}