1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110

//! RPC interface for the Redeem Module.

use codec::Codec;
use jsonrpsee::{
    core::{async_trait, Error as JsonRpseeError, RpcResult},
    proc_macros::rpc,
    types::error::{CallError, ErrorCode, ErrorObject},
};
use oracle_rpc_runtime_api::BalanceWrapper;
use sp_api::ProvideRuntimeApi;
use sp_blockchain::HeaderBackend;
use sp_runtime::{
    traits::{Block as BlockT, MaybeDisplay, MaybeFromStr},
    DispatchError,
};
use std::sync::Arc;

pub use redeem_rpc_runtime_api::RedeemApi as RedeemRuntimeApi;

fn handle_response<T, E: std::fmt::Debug>(result: Result<Result<T, DispatchError>, E>, msg: String) -> RpcResult<T> {
    result
        .map_err(|err| internal_err(format!("Runtime error: {:?}: {:?}", msg, err)))?
        .map_err(|err| internal_err(format!("Execution error: {:?}: {:?}", msg, err)))
}

#[rpc(client, server)]
pub trait RedeemApi<BlockHash, VaultId, Balance, AccountId, H256, RedeemRequest>
where
    Balance: Codec + MaybeDisplay + MaybeFromStr,
{
    #[method(name = "redeem_getRedeemRequests")]
    fn get_redeem_requests(&self, account_id: AccountId, at: Option<BlockHash>) -> RpcResult<Vec<H256>>;

    #[method(name = "redeem_getVaultRedeemRequests")]
    fn get_vault_redeem_requests(&self, vault_id: AccountId, at: Option<BlockHash>) -> RpcResult<Vec<H256>>;

    #[method(name = "redeem_getPremiumRedeemVaults", aliases = ["vaultRegistry_getPremiumRedeemVaults"])]
    fn get_premium_redeem_vaults(&self, at: Option<BlockHash>) -> RpcResult<Vec<(VaultId, BalanceWrapper<Balance>)>>;
}

fn internal_err<T: ToString>(message: T) -> JsonRpseeError {
    JsonRpseeError::Call(CallError::Custom(ErrorObject::owned(
        ErrorCode::InternalError.code(),
        message.to_string(),
        None::<()>,
    )))
}

/// A struct that implements the [`RedeemApi`].
pub struct Redeem<C, B> {
    client: Arc<C>,
    _marker: std::marker::PhantomData<B>,
}

impl<C, B> Redeem<C, B> {
    /// Create new `Redeem` with the given reference to the client.
    pub fn new(client: Arc<C>) -> Self {
        Redeem {
            client,
            _marker: Default::default(),
        }
    }
}

#[async_trait]
impl<C, Block, VaultId, Balance, AccountId, H256, RedeemRequest>
    RedeemApiServer<<Block as BlockT>::Hash, VaultId, Balance, AccountId, H256, RedeemRequest> for Redeem<C, Block>
where
    Block: BlockT,
    C: Send + Sync + 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block>,
    C::Api: RedeemRuntimeApi<Block, VaultId, Balance, AccountId, H256, RedeemRequest>,
    VaultId: Codec,
    Balance: Codec + MaybeDisplay + MaybeFromStr,
    AccountId: Codec,
    H256: Codec,
    RedeemRequest: Codec,
{
    fn get_redeem_requests(&self, account_id: AccountId, at: Option<<Block as BlockT>::Hash>) -> RpcResult<Vec<H256>> {
        let api = self.client.runtime_api();
        let at = at.unwrap_or_else(|| self.client.info().best_hash);

        api.get_redeem_requests(at, account_id)
            .map_err(|e| internal_err(format!("Unable to fetch redeem requests: {:?}", e)))
    }

    fn get_vault_redeem_requests(
        &self,
        vault_id: AccountId,
        at: Option<<Block as BlockT>::Hash>,
    ) -> RpcResult<Vec<H256>> {
        let api = self.client.runtime_api();
        let at = at.unwrap_or_else(|| self.client.info().best_hash);

        api.get_vault_redeem_requests(at, vault_id)
            .map_err(|e| internal_err(format!("Unable to fetch redeem requests: {:?}", e)))
    }

    fn get_premium_redeem_vaults(
        &self,
        at: Option<<Block as BlockT>::Hash>,
    ) -> RpcResult<Vec<(VaultId, BalanceWrapper<Balance>)>> {
        let api = self.client.runtime_api();
        let at = at.unwrap_or_else(|| self.client.info().best_hash);

        handle_response(
            api.get_premium_redeem_vaults(at),
            "Unable to find a vault below the premium redeem threshold".into(),
        )
    }
}