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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172

use clockwork_utils::{anchor_sighash, AccountMetaData, InstructionData};

use {
    crate::{errors::*, objects::*},
    anchor_lang::prelude::*,
    anchor_spl::token::{transfer, Token, TokenAccount, Transfer},
    clockwork_utils::CrankResponse,
};

#[derive(Accounts)]
pub struct UnstakeProcess<'info> {
    #[account()]
    pub authority: SystemAccount<'info>,

    #[account(
        mut,
        associated_token::authority = delegation.authority,
        associated_token::mint = config.mint,
    )]
    pub authority_tokens: Box<Account<'info, TokenAccount>>,

    #[account(address = Config::pubkey())]
    pub config: Box<Account<'info, Config>>,

    #[account(
        mut,
        seeds = [
            SEED_DELEGATION,
            delegation.worker.as_ref(),
            delegation.id.to_be_bytes().as_ref(),
        ],
        bump,
        has_one = authority,
        has_one = worker,
    )]
    pub delegation: Box<Account<'info, Delegation>>,

    #[account(address = config.epoch_queue)]
    pub queue: Signer<'info>,

    #[account(
        mut,
        seeds = [SEED_REGISTRY],
        bump,
    )]
    pub registry: Box<Account<'info, Registry>>,

    #[account(address = anchor_spl::token::ID)]
    pub token_program: Program<'info, Token>,

    #[account(
        mut,
        seeds = [
            SEED_UNSTAKE,
            unstake.id.to_be_bytes().as_ref(),
        ],
        bump,
        has_one = authority,
        has_one = delegation
    )]
    pub unstake: Box<Account<'info, Unstake>>,

    #[account(address = worker.pubkey())]
    pub worker: Account<'info, Worker>,

    #[account(
        mut,
        associated_token::authority = worker,
        associated_token::mint = config.mint,
    )]
    pub worker_tokens: Box<Account<'info, TokenAccount>>,
}

pub fn handler(ctx: Context<UnstakeProcess>) -> Result<CrankResponse> {
    // Get accounts.
    let authority = &ctx.accounts.authority;
    let authority_tokens = &ctx.accounts.authority_tokens;
    let config = &ctx.accounts.config;
    let delegation = &mut ctx.accounts.delegation;
    let queue = &ctx.accounts.queue;
    let registry = &mut ctx.accounts.registry;
    let token_program = &ctx.accounts.token_program;
    let unstake = &ctx.accounts.unstake;
    let worker = &ctx.accounts.worker;
    let worker_tokens = &ctx.accounts.worker_tokens;

    // Verify the unstake amount is valid.
    require!(
        unstake.amount.le(&delegation.stake_amount),
        ClockworkError::InvalidUnstakeAmount
    );

    // Transfer tokens from the worker to the authority.
    transfer(
        CpiContext::new_with_signer(
            token_program.to_account_info(),
            Transfer {
                from: worker_tokens.to_account_info(),
                to: authority_tokens.to_account_info(),
                authority: worker.to_account_info(),
            },
            &[&[SEED_WORKER, worker.id.to_be_bytes().as_ref()]],
        ),
        unstake.amount,
    )?;

    // Decrement the delegations locked stake balacne by the requested unstake amount.
    delegation.stake_amount = delegation.stake_amount.checked_sub(unstake.amount).unwrap();

    // Close the unstake account by transfering all lamports to the authority.
    let balance = unstake.to_account_info().lamports();
    **unstake.to_account_info().try_borrow_mut_lamports()? = unstake
        .to_account_info()
        .lamports()
        .checked_sub(balance)
        .unwrap();
    **authority.to_account_info().try_borrow_mut_lamports()? = authority
        .to_account_info()
        .lamports()
        .checked_add(balance)
        .unwrap();

    // If this is the last unstake, then reset the registry's unstake counter.
    if unstake
        .id
        .checked_add(1)
        .unwrap()
        .eq(&registry.total_unstakes)
    {
        registry.total_unstakes = 0;
    }

    // Build next instruction for the queue.
    let next_instruction = if unstake
        .id
        .checked_add(1)
        .unwrap()
        .lt(&registry.total_unstakes)
    {
        let next_unstake_pubkey = Unstake::pubkey(unstake.id.checked_add(1).unwrap());
        Some(InstructionData {
            program_id: crate::ID,
            accounts: vec![
                AccountMetaData::new_readonly(config.key(), false),
                AccountMetaData::new_readonly(queue.key(), true),
                AccountMetaData::new_readonly(registry.key(), false),
                AccountMetaData::new_readonly(next_unstake_pubkey, false),
            ],
            data: anchor_sighash("unstake_preprocess").to_vec(),
        })
    } else {
        // This is the last unstake. Reset the registry's unstake counter.
        registry.total_unstakes = 0;

        // Move on to staking delegations.
        Some(InstructionData {
            program_id: crate::ID,
            accounts: vec![
                AccountMetaData::new_readonly(config.key(), false),
                AccountMetaData::new_readonly(queue.key(), true),
                AccountMetaData::new_readonly(registry.key(), false),
                AccountMetaData::new_readonly(Worker::pubkey(0), false),
            ],
            data: anchor_sighash("worker_delegations_stake").to_vec(),
        })
    };

    Ok(CrankResponse {
        next_instruction,
        ..CrankResponse::default()
    })
}