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/lib.rs

@@ -4,12 +4,16 @@ extern crate lazy_static;
 extern crate serde_derive;
 
 pub mod parse_account_data;
+pub mod parse_config;
 pub mod parse_nonce;
+pub mod parse_stake;
+pub mod parse_sysvar;
 pub mod parse_token;
 pub mod parse_vote;
+pub mod validator_info;
 
 use crate::parse_account_data::{parse_account_data, AccountAdditionalData, ParsedAccount};
-use solana_sdk::{account::Account, clock::Epoch, pubkey::Pubkey};
+use solana_sdk::{account::Account, clock::Epoch, fee_calculator::FeeCalculator, pubkey::Pubkey};
 use std::str::FromStr;
 
 pub type StringAmount = String;
@@ -49,6 +53,7 @@ pub enum UiAccountEncoding {
 
 impl UiAccount {
     pub fn encode(
+        pubkey: &Pubkey,
         account: Account,
         encoding: UiAccountEncoding,
         additional_data: Option<AccountAdditionalData>,
@@ -58,7 +63,7 @@ impl UiAccount {
             UiAccountEncoding::Binary64 => UiAccountData::Binary64(base64::encode(account.data)),
             UiAccountEncoding::JsonParsed => {
                 if let Ok(parsed_data) =
-                    parse_account_data(&account.owner, &account.data, additional_data)
+                    parse_account_data(pubkey, &account.owner, &account.data, additional_data)
                 {
                     UiAccountData::Json(parsed_data)
                 } else {
@@ -90,3 +95,25 @@ impl UiAccount {
         })
     }
 }
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiFeeCalculator {
+    pub lamports_per_signature: StringAmount,
+}
+
+impl From<FeeCalculator> for UiFeeCalculator {
+    fn from(fee_calculator: FeeCalculator) -> Self {
+        Self {
+            lamports_per_signature: fee_calculator.lamports_per_signature.to_string(),
+        }
+    }
+}
+
+impl Default for UiFeeCalculator {
+    fn default() -> Self {
+        Self {
+            lamports_per_signature: "0".to_string(),
+        }
+    }
+}

account-decoder/src/parse_account_data.rs

@@ -1,22 +1,31 @@
 use crate::{
+    parse_config::parse_config,
     parse_nonce::parse_nonce,
+    parse_stake::parse_stake,
+    parse_sysvar::parse_sysvar,
     parse_token::{parse_token, spl_token_id_v1_0},
     parse_vote::parse_vote,
 };
 use inflector::Inflector;
 use serde_json::Value;
-use solana_sdk::{instruction::InstructionError, pubkey::Pubkey, system_program};
+use solana_sdk::{instruction::InstructionError, pubkey::Pubkey, system_program, sysvar};
 use std::collections::HashMap;
 use thiserror::Error;
 
 lazy_static! {
+    static ref CONFIG_PROGRAM_ID: Pubkey = solana_config_program::id();
+    static ref STAKE_PROGRAM_ID: Pubkey = solana_stake_program::id();
     static ref SYSTEM_PROGRAM_ID: Pubkey = system_program::id();
+    static ref SYSVAR_PROGRAM_ID: Pubkey = sysvar::id();
     static ref TOKEN_PROGRAM_ID: Pubkey = spl_token_id_v1_0();
     static ref VOTE_PROGRAM_ID: Pubkey = solana_vote_program::id();
     pub static ref PARSABLE_PROGRAM_IDS: HashMap<Pubkey, ParsableAccount> = {
         let mut m = HashMap::new();
+        m.insert(*CONFIG_PROGRAM_ID, ParsableAccount::Config);
         m.insert(*SYSTEM_PROGRAM_ID, ParsableAccount::Nonce);
         m.insert(*TOKEN_PROGRAM_ID, ParsableAccount::SplToken);
+        m.insert(*STAKE_PROGRAM_ID, ParsableAccount::Stake);
+        m.insert(*SYSVAR_PROGRAM_ID, ParsableAccount::Sysvar);
         m.insert(*VOTE_PROGRAM_ID, ParsableAccount::Vote);
         m
     };
@@ -50,8 +59,11 @@ pub struct ParsedAccount {
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub enum ParsableAccount {
+    Config,
     Nonce,
     SplToken,
+    Stake,
+    Sysvar,
     Vote,
 }
 
@@ -61,6 +73,7 @@ pub struct AccountAdditionalData {
 }
 
 pub fn parse_account_data(
+    pubkey: &Pubkey,
     program_id: &Pubkey,
     data: &[u8],
     additional_data: Option<AccountAdditionalData>,
@@ -70,10 +83,13 @@ pub fn parse_account_data(
         .ok_or_else(|| ParseAccountError::ProgramNotParsable)?;
     let additional_data = additional_data.unwrap_or_default();
     let parsed_json = match program_name {
+        ParsableAccount::Config => serde_json::to_value(parse_config(data, pubkey)?)?,
         ParsableAccount::Nonce => serde_json::to_value(parse_nonce(data)?)?,
         ParsableAccount::SplToken => {
             serde_json::to_value(parse_token(data, additional_data.spl_token_decimals)?)?
         }
+        ParsableAccount::Stake => serde_json::to_value(parse_stake(data)?)?,
+        ParsableAccount::Sysvar => serde_json::to_value(parse_sysvar(data, pubkey)?)?,
         ParsableAccount::Vote => serde_json::to_value(parse_vote(data)?)?,
     };
     Ok(ParsedAccount {
@@ -93,21 +109,33 @@ mod test {
 
     #[test]
     fn test_parse_account_data() {
+        let account_pubkey = Pubkey::new_rand();
         let other_program = Pubkey::new_rand();
         let data = vec![0; 4];
-        assert!(parse_account_data(&other_program, &data, None).is_err());
+        assert!(parse_account_data(&account_pubkey, &other_program, &data, None).is_err());
 
         let vote_state = VoteState::default();
         let mut vote_account_data: Vec<u8> = vec![0; VoteState::size_of()];
         let versioned = VoteStateVersions::Current(Box::new(vote_state));
         VoteState::serialize(&versioned, &mut vote_account_data).unwrap();
-        let parsed =
-            parse_account_data(&solana_vote_program::id(), &vote_account_data, None).unwrap();
+        let parsed = parse_account_data(
+            &account_pubkey,
+            &solana_vote_program::id(),
+            &vote_account_data,
+            None,
+        )
+        .unwrap();
         assert_eq!(parsed.program, "vote".to_string());
 
         let nonce_data = Versions::new_current(State::Initialized(Data::default()));
         let nonce_account_data = bincode::serialize(&nonce_data).unwrap();
-        let parsed = parse_account_data(&system_program::id(), &nonce_account_data, None).unwrap();
+        let parsed = parse_account_data(
+            &account_pubkey,
+            &system_program::id(),
+            &nonce_account_data,
+            None,
+        )
+        .unwrap();
         assert_eq!(parsed.program, "nonce".to_string());
     }
 }

account-decoder/src/parse_config.rs

@@ -0,0 +1,146 @@
+use crate::{
+    parse_account_data::{ParsableAccount, ParseAccountError},
+    validator_info,
+};
+use bincode::deserialize;
+use serde_json::Value;
+use solana_config_program::{get_config_data, ConfigKeys};
+use solana_sdk::pubkey::Pubkey;
+use solana_stake_program::config::Config as StakeConfig;
+
+pub fn parse_config(data: &[u8], pubkey: &Pubkey) -> Result<ConfigAccountType, ParseAccountError> {
+    let parsed_account = if pubkey == &solana_stake_program::config::id() {
+        get_config_data(data)
+            .ok()
+            .and_then(|data| deserialize::<StakeConfig>(data).ok())
+            .map(|config| ConfigAccountType::StakeConfig(config.into()))
+    } else {
+        deserialize::<ConfigKeys>(data).ok().and_then(|key_list| {
+            if !key_list.keys.is_empty() && key_list.keys[0].0 == validator_info::id() {
+                parse_config_data::<String>(data, key_list.keys).and_then(|validator_info| {
+                    Some(ConfigAccountType::ValidatorInfo(UiConfig {
+                        keys: validator_info.keys,
+                        config_data: serde_json::from_str(&validator_info.config_data).ok()?,
+                    }))
+                })
+            } else {
+                None
+            }
+        })
+    };
+    parsed_account.ok_or(ParseAccountError::AccountNotParsable(
+        ParsableAccount::Config,
+    ))
+}
+
+fn parse_config_data<T>(data: &[u8], keys: Vec<(Pubkey, bool)>) -> Option<UiConfig<T>>
+where
+    T: serde::de::DeserializeOwned,
+{
+    let config_data: T = deserialize(&get_config_data(data).ok()?).ok()?;
+    let keys = keys
+        .iter()
+        .map(|key| UiConfigKey {
+            pubkey: key.0.to_string(),
+            signer: key.1,
+        })
+        .collect();
+    Some(UiConfig { keys, config_data })
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase", tag = "type", content = "info")]
+pub enum ConfigAccountType {
+    StakeConfig(UiStakeConfig),
+    ValidatorInfo(UiConfig<Value>),
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiConfigKey {
+    pub pubkey: String,
+    pub signer: bool,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiStakeConfig {
+    pub warmup_cooldown_rate: f64,
+    pub slash_penalty: u8,
+}
+
+impl From<StakeConfig> for UiStakeConfig {
+    fn from(config: StakeConfig) -> Self {
+        Self {
+            warmup_cooldown_rate: config.warmup_cooldown_rate,
+            slash_penalty: config.slash_penalty,
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiConfig<T> {
+    pub keys: Vec<UiConfigKey>,
+    pub config_data: T,
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::validator_info::ValidatorInfo;
+    use serde_json::json;
+    use solana_config_program::create_config_account;
+
+    #[test]
+    fn test_parse_config() {
+        let stake_config = StakeConfig {
+            warmup_cooldown_rate: 0.25,
+            slash_penalty: 50,
+        };
+        let stake_config_account = create_config_account(vec![], &stake_config, 10);
+        assert_eq!(
+            parse_config(
+                &stake_config_account.data,
+                &solana_stake_program::config::id()
+            )
+            .unwrap(),
+            ConfigAccountType::StakeConfig(UiStakeConfig {
+                warmup_cooldown_rate: 0.25,
+                slash_penalty: 50,
+            }),
+        );
+
+        let validator_info = ValidatorInfo {
+            info: serde_json::to_string(&json!({
+                "name": "Solana",
+            }))
+            .unwrap(),
+        };
+        let info_pubkey = Pubkey::new_rand();
+        let validator_info_config_account = create_config_account(
+            vec![(validator_info::id(), false), (info_pubkey, true)],
+            &validator_info,
+            10,
+        );
+        assert_eq!(
+            parse_config(&validator_info_config_account.data, &info_pubkey).unwrap(),
+            ConfigAccountType::ValidatorInfo(UiConfig {
+                keys: vec![
+                    UiConfigKey {
+                        pubkey: validator_info::id().to_string(),
+                        signer: false,
+                    },
+                    UiConfigKey {
+                        pubkey: info_pubkey.to_string(),
+                        signer: true,
+                    }
+                ],
+                config_data: serde_json::from_str(r#"{"name":"Solana"}"#).unwrap(),
+            }),
+        );
+
+        let bad_data = vec![0; 4];
+        assert!(parse_config(&bad_data, &info_pubkey).is_err());
+    }
+}

account-decoder/src/parse_nonce.rs

@@ -1,6 +1,5 @@
-use crate::parse_account_data::ParseAccountError;
+use crate::{parse_account_data::ParseAccountError, UiFeeCalculator};
 use solana_sdk::{
-    fee_calculator::FeeCalculator,
     instruction::InstructionError,
     nonce::{state::Versions, State},
 };
@@ -14,7 +13,7 @@ pub fn parse_nonce(data: &[u8]) -> Result<UiNonceState, ParseAccountError> {
         State::Initialized(data) => Ok(UiNonceState::Initialized(UiNonceData {
             authority: data.authority.to_string(),
             blockhash: data.blockhash.to_string(),
-            fee_calculator: data.fee_calculator,
+            fee_calculator: data.fee_calculator.into(),
         })),
     }
 }
@@ -32,7 +31,7 @@ pub enum UiNonceState {
 pub struct UiNonceData {
     pub authority: String,
     pub blockhash: String,
-    pub fee_calculator: FeeCalculator,
+    pub fee_calculator: UiFeeCalculator,
 }
 
 #[cfg(test)]
@@ -56,7 +55,9 @@ mod test {
             UiNonceState::Initialized(UiNonceData {
                 authority: Pubkey::default().to_string(),
                 blockhash: Hash::default().to_string(),
-                fee_calculator: FeeCalculator::default(),
+                fee_calculator: UiFeeCalculator {
+                    lamports_per_signature: 0.to_string(),
+                },
             }),
         );
 

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());
+    }
+}

account-decoder/src/parse_sysvar.rs

@@ -0,0 +1,328 @@
+use crate::{
+    parse_account_data::{ParsableAccount, ParseAccountError},
+    StringAmount, UiFeeCalculator,
+};
+use bincode::deserialize;
+use bv::BitVec;
+use solana_sdk::{
+    clock::{Clock, Epoch, Slot, UnixTimestamp},
+    epoch_schedule::EpochSchedule,
+    pubkey::Pubkey,
+    rent::Rent,
+    slot_hashes::SlotHashes,
+    slot_history::{self, SlotHistory},
+    stake_history::{StakeHistory, StakeHistoryEntry},
+    sysvar::{self, fees::Fees, recent_blockhashes::RecentBlockhashes, rewards::Rewards},
+};
+
+pub fn parse_sysvar(data: &[u8], pubkey: &Pubkey) -> Result<SysvarAccountType, ParseAccountError> {
+    let parsed_account = {
+        if pubkey == &sysvar::clock::id() {
+            deserialize::<Clock>(data)
+                .ok()
+                .map(|clock| SysvarAccountType::Clock(clock.into()))
+        } else if pubkey == &sysvar::epoch_schedule::id() {
+            deserialize(data).ok().map(SysvarAccountType::EpochSchedule)
+        } else if pubkey == &sysvar::fees::id() {
+            deserialize::<Fees>(data)
+                .ok()
+                .map(|fees| SysvarAccountType::Fees(fees.into()))
+        } else if pubkey == &sysvar::recent_blockhashes::id() {
+            deserialize::<RecentBlockhashes>(data)
+                .ok()
+                .map(|recent_blockhashes| {
+                    let recent_blockhashes = recent_blockhashes
+                        .iter()
+                        .map(|entry| UiRecentBlockhashesEntry {
+                            blockhash: entry.blockhash.to_string(),
+                            fee_calculator: entry.fee_calculator.clone().into(),
+                        })
+                        .collect();
+                    SysvarAccountType::RecentBlockhashes(recent_blockhashes)
+                })
+        } else if pubkey == &sysvar::rent::id() {
+            deserialize::<Rent>(data)
+                .ok()
+                .map(|rent| SysvarAccountType::Rent(rent.into()))
+        } else if pubkey == &sysvar::rewards::id() {
+            deserialize::<Rewards>(data)
+                .ok()
+                .map(|rewards| SysvarAccountType::Rewards(rewards.into()))
+        } else if pubkey == &sysvar::slot_hashes::id() {
+            deserialize::<SlotHashes>(data).ok().map(|slot_hashes| {
+                let slot_hashes = slot_hashes
+                    .iter()
+                    .map(|slot_hash| UiSlotHashEntry {
+                        slot: slot_hash.0,
+                        hash: slot_hash.1.to_string(),
+                    })
+                    .collect();
+                SysvarAccountType::SlotHashes(slot_hashes)
+            })
+        } else if pubkey == &sysvar::slot_history::id() {
+            deserialize::<SlotHistory>(data).ok().map(|slot_history| {
+                SysvarAccountType::SlotHistory(UiSlotHistory {
+                    next_slot: slot_history.next_slot,
+                    bits: format!("{:?}", SlotHistoryBits(slot_history.bits)),
+                })
+            })
+        } else if pubkey == &sysvar::stake_history::id() {
+            deserialize::<StakeHistory>(data).ok().map(|stake_history| {
+                let stake_history = stake_history
+                    .iter()
+                    .map(|entry| UiStakeHistoryEntry {
+                        epoch: entry.0,
+                        stake_history: entry.1.clone(),
+                    })
+                    .collect();
+                SysvarAccountType::StakeHistory(stake_history)
+            })
+        } else {
+            None
+        }
+    };
+    parsed_account.ok_or(ParseAccountError::AccountNotParsable(
+        ParsableAccount::Sysvar,
+    ))
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase", tag = "type", content = "info")]
+pub enum SysvarAccountType {
+    Clock(UiClock),
+    EpochSchedule(EpochSchedule),
+    Fees(UiFees),
+    RecentBlockhashes(Vec<UiRecentBlockhashesEntry>),
+    Rent(UiRent),
+    Rewards(UiRewards),
+    SlotHashes(Vec<UiSlotHashEntry>),
+    SlotHistory(UiSlotHistory),
+    StakeHistory(Vec<UiStakeHistoryEntry>),
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct UiClock {
+    pub slot: Slot,
+    pub epoch: Epoch,
+    pub leader_schedule_epoch: Epoch,
+    pub unix_timestamp: UnixTimestamp,
+}
+
+impl From<Clock> for UiClock {
+    fn from(clock: Clock) -> Self {
+        Self {
+            slot: clock.slot,
+            epoch: clock.epoch,
+            leader_schedule_epoch: clock.leader_schedule_epoch,
+            unix_timestamp: clock.unix_timestamp,
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct UiFees {
+    pub fee_calculator: UiFeeCalculator,
+}
+impl From<Fees> for UiFees {
+    fn from(fees: Fees) -> Self {
+        Self {
+            fee_calculator: fees.fee_calculator.into(),
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct UiRent {
+    pub lamports_per_byte_year: StringAmount,
+    pub exemption_threshold: f64,
+    pub burn_percent: u8,
+}
+
+impl From<Rent> for UiRent {
+    fn from(rent: Rent) -> Self {
+        Self {
+            lamports_per_byte_year: rent.lamports_per_byte_year.to_string(),
+            exemption_threshold: rent.exemption_threshold,
+            burn_percent: rent.burn_percent,
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct UiRewards {
+    pub validator_point_value: f64,
+}
+
+impl From<Rewards> for UiRewards {
+    fn from(rewards: Rewards) -> Self {
+        Self {
+            validator_point_value: rewards.validator_point_value,
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiRecentBlockhashesEntry {
+    pub blockhash: String,
+    pub fee_calculator: UiFeeCalculator,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiSlotHashEntry {
+    pub slot: Slot,
+    pub hash: String,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiSlotHistory {
+    pub next_slot: Slot,
+    pub bits: String,
+}
+
+struct SlotHistoryBits(BitVec<u64>);
+
+impl std::fmt::Debug for SlotHistoryBits {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        for i in 0..slot_history::MAX_ENTRIES {
+            if self.0.get(i) {
+                write!(f, "1")?;
+            } else {
+                write!(f, "0")?;
+            }
+        }
+        Ok(())
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UiStakeHistoryEntry {
+    pub epoch: Epoch,
+    pub stake_history: StakeHistoryEntry,
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use solana_sdk::{
+        fee_calculator::FeeCalculator,
+        hash::Hash,
+        sysvar::{recent_blockhashes::IterItem, Sysvar},
+    };
+    use std::iter::FromIterator;
+
+    #[test]
+    fn test_parse_sysvars() {
+        let clock_sysvar = Clock::default().create_account(1);
+        assert_eq!(
+            parse_sysvar(&clock_sysvar.data, &sysvar::clock::id()).unwrap(),
+            SysvarAccountType::Clock(UiClock::default()),
+        );
+
+        let epoch_schedule = EpochSchedule {
+            slots_per_epoch: 12,
+            leader_schedule_slot_offset: 0,
+            warmup: false,
+            first_normal_epoch: 1,
+            first_normal_slot: 12,
+        };
+        let epoch_schedule_sysvar = epoch_schedule.create_account(1);
+        assert_eq!(
+            parse_sysvar(&epoch_schedule_sysvar.data, &sysvar::epoch_schedule::id()).unwrap(),
+            SysvarAccountType::EpochSchedule(epoch_schedule),
+        );
+
+        let fees_sysvar = Fees::default().create_account(1);
+        assert_eq!(
+            parse_sysvar(&fees_sysvar.data, &sysvar::fees::id()).unwrap(),
+            SysvarAccountType::Fees(UiFees::default()),
+        );
+
+        let hash = Hash::new(&[1; 32]);
+        let fee_calculator = FeeCalculator {
+            lamports_per_signature: 10,
+        };
+        let recent_blockhashes =
+            RecentBlockhashes::from_iter(vec![IterItem(0, &hash, &fee_calculator)].into_iter());
+        let recent_blockhashes_sysvar = recent_blockhashes.create_account(1);
+        assert_eq!(
+            parse_sysvar(
+                &recent_blockhashes_sysvar.data,
+                &sysvar::recent_blockhashes::id()
+            )
+            .unwrap(),
+            SysvarAccountType::RecentBlockhashes(vec![UiRecentBlockhashesEntry {
+                blockhash: hash.to_string(),
+                fee_calculator: fee_calculator.into(),
+            }]),
+        );
+
+        let rent = Rent {
+            lamports_per_byte_year: 10,
+            exemption_threshold: 2.0,
+            burn_percent: 5,
+        };
+        let rent_sysvar = rent.create_account(1);
+        assert_eq!(
+            parse_sysvar(&rent_sysvar.data, &sysvar::rent::id()).unwrap(),
+            SysvarAccountType::Rent(rent.into()),
+        );
+
+        let rewards_sysvar = Rewards::default().create_account(1);
+        assert_eq!(
+            parse_sysvar(&rewards_sysvar.data, &sysvar::rewards::id()).unwrap(),
+            SysvarAccountType::Rewards(UiRewards::default()),
+        );
+
+        let mut slot_hashes = SlotHashes::default();
+        slot_hashes.add(1, hash);
+        let slot_hashes_sysvar = slot_hashes.create_account(1);
+        assert_eq!(
+            parse_sysvar(&slot_hashes_sysvar.data, &sysvar::slot_hashes::id()).unwrap(),
+            SysvarAccountType::SlotHashes(vec![UiSlotHashEntry {
+                slot: 1,
+                hash: hash.to_string(),
+            }]),
+        );
+
+        let mut slot_history = SlotHistory::default();
+        slot_history.add(42);
+        let slot_history_sysvar = slot_history.create_account(1);
+        assert_eq!(
+            parse_sysvar(&slot_history_sysvar.data, &sysvar::slot_history::id()).unwrap(),
+            SysvarAccountType::SlotHistory(UiSlotHistory {
+                next_slot: slot_history.next_slot,
+                bits: format!("{:?}", SlotHistoryBits(slot_history.bits)),
+            }),
+        );
+
+        let mut stake_history = StakeHistory::default();
+        let stake_history_entry = StakeHistoryEntry {
+            effective: 10,
+            activating: 2,
+            deactivating: 3,
+        };
+        stake_history.add(1, stake_history_entry.clone());
+        let stake_history_sysvar = stake_history.create_account(1);
+        assert_eq!(
+            parse_sysvar(&stake_history_sysvar.data, &sysvar::stake_history::id()).unwrap(),
+            SysvarAccountType::StakeHistory(vec![UiStakeHistoryEntry {
+                epoch: 1,
+                stake_history: stake_history_entry,
+            }]),
+        );
+
+        let bad_pubkey = Pubkey::new_rand();
+        assert!(parse_sysvar(&stake_history_sysvar.data, &bad_pubkey).is_err());
+
+        let bad_data = vec![0; 4];
+        assert!(parse_sysvar(&bad_data, &sysvar::stake_history::id()).is_err());
+    }
+}

account-decoder/src/parse_vote.rs

@@ -1,4 +1,4 @@
-use crate::parse_account_data::ParseAccountError;
+use crate::{parse_account_data::ParseAccountError, StringAmount};
 use solana_sdk::{
     clock::{Epoch, Slot},
     pubkey::Pubkey,
@@ -12,8 +12,8 @@ pub fn parse_vote(data: &[u8]) -> Result<VoteAccountType, ParseAccountError> {
         .iter()
         .map(|(epoch, credits, previous_credits)| UiEpochCredits {
             epoch: *epoch,
-            credits: *credits,
-            previous_credits: *previous_credits,
+            credits: credits.to_string(),
+            previous_credits: previous_credits.to_string(),
         })
         .collect();
     let votes = vote_state
@@ -115,8 +115,8 @@ struct UiPriorVoters {
 #[serde(rename_all = "camelCase")]
 struct UiEpochCredits {
     epoch: Epoch,
-    credits: u64,
-    previous_credits: u64,
+    credits: StringAmount,
+    previous_credits: StringAmount,
 }
 
 #[cfg(test)]

account-decoder/src/validator_info.rs

@@ -0,0 +1,18 @@
+use solana_config_program::ConfigState;
+
+pub const MAX_SHORT_FIELD_LENGTH: usize = 70;
+pub const MAX_LONG_FIELD_LENGTH: usize = 300;
+pub const MAX_VALIDATOR_INFO: u64 = 576;
+
+solana_sdk::declare_id!("Va1idator1nfo111111111111111111111111111111");
+
+#[derive(Debug, Deserialize, PartialEq, Serialize, Default)]
+pub struct ValidatorInfo {
+    pub info: String,
+}
+
+impl ConfigState for ValidatorInfo {
+    fn max_space() -> u64 {
+        MAX_VALIDATOR_INFO
+    }
+}