Decode native-program and sysvar accounts (#11463)

* Pass pubkey in to account-decoder for sysvars

* Decode sysvar accounts

* Decode config accounts; move validator-info lower

* Decode stake accounts

* Review comments

* Stringify any account lamports and epochs that can be set to u64::MAX

account-decoder/src/parse_stake.rs

@@ -0,0 +1,235 @@
+use crate::{
+    parse_account_data::{ParsableAccount, ParseAccountError},
+    StringAmount,
+};
+use bincode::deserialize;
+use solana_sdk::clock::{Epoch, UnixTimestamp};
+use solana_stake_program::stake_state::{Authorized, Delegation, Lockup, Meta, Stake, StakeState};
+
+pub fn parse_stake(data: &[u8]) -> Result<StakeAccountType, ParseAccountError> {
+    let stake_state: StakeState = deserialize(data)
+        .map_err(|_| ParseAccountError::AccountNotParsable(ParsableAccount::Stake))?;
+    let parsed_account = match stake_state {
+        StakeState::Uninitialized => StakeAccountType::Uninitialized,
+        StakeState::Initialized(meta) => StakeAccountType::Initialized(UiStakeAccount {
+            meta: meta.into(),
+            stake: None,
+        }),
+        StakeState::Stake(meta, stake) => StakeAccountType::Delegated(UiStakeAccount {
+            meta: meta.into(),
+            stake: Some(stake.into()),
+        }),
+        StakeState::RewardsPool => StakeAccountType::RewardsPool,
+    };
+    Ok(parsed_account)
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase", tag = "type", content = "info")]
+pub enum StakeAccountType {
+    Uninitialized,
+    Initialized(UiStakeAccount),
+    Delegated(UiStakeAccount),
+    RewardsPool,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiStakeAccount {
+    pub meta: UiMeta,
+    pub stake: Option<UiStake>,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiMeta {
+    pub rent_exempt_reserve: StringAmount,
+    pub authorized: UiAuthorized,
+    pub lockup: UiLockup,
+}
+
+impl From<Meta> for UiMeta {
+    fn from(meta: Meta) -> Self {
+        Self {
+            rent_exempt_reserve: meta.rent_exempt_reserve.to_string(),
+            authorized: meta.authorized.into(),
+            lockup: meta.lockup.into(),
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiLockup {
+    pub unix_timestamp: UnixTimestamp,
+    pub epoch: Epoch,
+    pub custodian: String,
+}
+
+impl From<Lockup> for UiLockup {
+    fn from(lockup: Lockup) -> Self {
+        Self {
+            unix_timestamp: lockup.unix_timestamp,
+            epoch: lockup.epoch,
+            custodian: lockup.custodian.to_string(),
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiAuthorized {
+    pub staker: String,
+    pub withdrawer: String,
+}
+
+impl From<Authorized> for UiAuthorized {
+    fn from(authorized: Authorized) -> Self {
+        Self {
+            staker: authorized.staker.to_string(),
+            withdrawer: authorized.withdrawer.to_string(),
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiStake {
+    pub delegation: UiDelegation,
+    pub credits_observed: u64,
+}
+
+impl From<Stake> for UiStake {
+    fn from(stake: Stake) -> Self {
+        Self {
+            delegation: stake.delegation.into(),
+            credits_observed: stake.credits_observed,
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiDelegation {
+    pub voter: String,
+    pub stake: StringAmount,
+    pub activation_epoch: StringAmount,
+    pub deactivation_epoch: StringAmount,
+    pub warmup_cooldown_rate: f64,
+}
+
+impl From<Delegation> for UiDelegation {
+    fn from(delegation: Delegation) -> Self {
+        Self {
+            voter: delegation.voter_pubkey.to_string(),
+            stake: delegation.stake.to_string(),
+            activation_epoch: delegation.activation_epoch.to_string(),
+            deactivation_epoch: delegation.deactivation_epoch.to_string(),
+            warmup_cooldown_rate: delegation.warmup_cooldown_rate,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use bincode::serialize;
+    use solana_sdk::pubkey::Pubkey;
+
+    #[test]
+    fn test_parse_stake() {
+        let stake_state = StakeState::Uninitialized;
+        let stake_data = serialize(&stake_state).unwrap();
+        assert_eq!(
+            parse_stake(&stake_data).unwrap(),
+            StakeAccountType::Uninitialized
+        );
+
+        let pubkey = Pubkey::new_rand();
+        let custodian = Pubkey::new_rand();
+        let authorized = Authorized::auto(&pubkey);
+        let lockup = Lockup {
+            unix_timestamp: 0,
+            epoch: 1,
+            custodian,
+        };
+        let meta = Meta {
+            rent_exempt_reserve: 42,
+            authorized,
+            lockup,
+        };
+
+        let stake_state = StakeState::Initialized(meta);
+        let stake_data = serialize(&stake_state).unwrap();
+        assert_eq!(
+            parse_stake(&stake_data).unwrap(),
+            StakeAccountType::Initialized(UiStakeAccount {
+                meta: UiMeta {
+                    rent_exempt_reserve: 42.to_string(),
+                    authorized: UiAuthorized {
+                        staker: pubkey.to_string(),
+                        withdrawer: pubkey.to_string(),
+                    },
+                    lockup: UiLockup {
+                        unix_timestamp: 0,
+                        epoch: 1,
+                        custodian: custodian.to_string(),
+                    }
+                },
+                stake: None,
+            })
+        );
+
+        let voter_pubkey = Pubkey::new_rand();
+        let stake = Stake {
+            delegation: Delegation {
+                voter_pubkey,
+                stake: 20,
+                activation_epoch: 2,
+                deactivation_epoch: std::u64::MAX,
+                warmup_cooldown_rate: 0.25,
+            },
+            credits_observed: 10,
+        };
+
+        let stake_state = StakeState::Stake(meta, stake);
+        let stake_data = serialize(&stake_state).unwrap();
+        assert_eq!(
+            parse_stake(&stake_data).unwrap(),
+            StakeAccountType::Delegated(UiStakeAccount {
+                meta: UiMeta {
+                    rent_exempt_reserve: 42.to_string(),
+                    authorized: UiAuthorized {
+                        staker: pubkey.to_string(),
+                        withdrawer: pubkey.to_string(),
+                    },
+                    lockup: UiLockup {
+                        unix_timestamp: 0,
+                        epoch: 1,
+                        custodian: custodian.to_string(),
+                    }
+                },
+                stake: Some(UiStake {
+                    delegation: UiDelegation {
+                        voter: voter_pubkey.to_string(),
+                        stake: 20.to_string(),
+                        activation_epoch: 2.to_string(),
+                        deactivation_epoch: std::u64::MAX.to_string(),
+                        warmup_cooldown_rate: 0.25,
+                    },
+                    credits_observed: 10,
+                })
+            })
+        );
+
+        let stake_state = StakeState::RewardsPool;
+        let stake_data = serialize(&stake_state).unwrap();
+        assert_eq!(
+            parse_stake(&stake_data).unwrap(),
+            StakeAccountType::RewardsPool
+        );
+
+        let bad_data = vec![1, 2, 3, 4];
+        assert!(parse_stake(&bad_data).is_err());
+    }
+}