Add time since genesis to sysvar::clock (#7289)

* genesis timestamp

* remove clock::create_account()

* ..

* add configure-able creation time

* dividing by 1T, should be dividing by 1B

sdk/src/clock.rs

@@ -108,6 +108,9 @@ pub struct Clock {
     /// the future Epoch for which the leader schedule has
     ///  most recently been calculated
     pub leader_schedule_epoch: Epoch,
+    /// computed from genesis creation time and network time
+    ///  in slots, drifts!
+    pub unix_timestamp: UnixTimestamp,
 }
 
 #[cfg(test)]

sdk/src/genesis_config.rs

@@ -2,7 +2,7 @@
 
 use crate::{
     account::Account,
-    clock::{DEFAULT_SLOTS_PER_SEGMENT, DEFAULT_TICKS_PER_SLOT},
+    clock::{UnixTimestamp, DEFAULT_SLOTS_PER_SEGMENT, DEFAULT_TICKS_PER_SLOT},
     epoch_schedule::EpochSchedule,
     fee_calculator::FeeCalculator,
     hash::{hash, Hash},
@@ -21,6 +21,7 @@ use std::{
     fs::{File, OpenOptions},
     io::Write,
     path::{Path, PathBuf},
+    time::{SystemTime, UNIX_EPOCH},
 };
 
 #[derive(Serialize, Deserialize, Debug, Clone, Copy)]
@@ -31,16 +32,27 @@ pub enum OperatingMode {
 
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct GenesisConfig {
+    /// when the network (bootstrap leader) was started relative to the UNIX Epoch
+    pub creation_time: UnixTimestamp,
+    /// initial accounts
     pub accounts: BTreeMap<Pubkey, Account>,
+    /// built-in programs
     pub native_instruction_processors: Vec<(String, Pubkey)>,
+    /// accounts for network rewards, these do not count towards capitalization
     pub rewards_pools: BTreeMap<Pubkey, Account>,
     pub ticks_per_slot: u64,
     pub slots_per_segment: u64,
+    /// network speed configuration
     pub poh_config: PohConfig,
+    /// transaction fee config
     pub fee_calculator: FeeCalculator,
+    /// rent config
     pub rent: Rent,
+    /// inflation config
     pub inflation: Inflation,
+    /// how slots map to epochs
     pub epoch_schedule: EpochSchedule,
+    /// network runlevel
     pub operating_mode: OperatingMode,
 }
 
@@ -62,6 +74,10 @@ pub fn create_genesis_config(lamports: u64) -> (GenesisConfig, Keypair) {
 impl Default for GenesisConfig {
     fn default() -> Self {
         Self {
+            creation_time: SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .unwrap()
+                .as_secs() as UnixTimestamp,
             accounts: BTreeMap::default(),
             native_instruction_processors: Vec::default(),
             rewards_pools: BTreeMap::default(),

sdk/src/sysvar/clock.rs

@@ -2,40 +2,8 @@
 //!
 pub use crate::clock::Clock;
 
-use crate::{
-    account::Account,
-    clock::{Epoch, Segment, Slot},
-    sysvar::Sysvar,
-};
+use crate::sysvar::Sysvar;
 
 crate::declare_sysvar_id!("SysvarC1ock11111111111111111111111111111111", Clock);
 
 impl Sysvar for Clock {}
-
-pub fn create_account(
-    lamports: u64,
-    slot: Slot,
-    segment: Segment,
-    epoch: Epoch,
-    leader_schedule_epoch: Epoch,
-) -> Account {
-    Clock {
-        slot,
-        segment,
-        epoch,
-        leader_schedule_epoch,
-    }
-    .create_account(lamports)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_new() {
-        let account = create_account(1, 0, 0, 0, 0);
-        let clock = Clock::from_account(&account).unwrap();
-        assert_eq!(clock, Clock::default());
-    }
-}