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_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());
+    }
+}