Source file shared_stake.ml
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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
type shared = {baker_part : Tez_repr.t; stakers_part : Tez_repr.t}
let share ~adaptive_issuance_global_limit_of_staking_over_baking
(delegate_parameters : Staking_parameters_repr.t) ~rounding
~full_staking_balance amount =
let open Result_syntax in
let num, den =
Full_staking_balance_repr.own_ratio
~adaptive_issuance_global_limit_of_staking_over_baking
~delegate_limit_of_staking_over_baking_millionth:
delegate_parameters.limit_of_staking_over_baking_millionth
full_staking_balance
in
let* baker_part =
let rounding =
match rounding with `Towards_stakers -> `Down | `Towards_baker -> `Up
in
Tez_repr.mul_ratio ~rounding amount ~num ~den
in
let* stakers_part = Tez_repr.(amount -? baker_part) in
return {baker_part; stakers_part}
type reward_distrib = {
to_baker_from_staking : Tez_repr.t;
to_baker_from_edge_over_stakers : Tez_repr.t;
to_stakers : Tez_repr.t;
to_spendable : Tez_repr.t;
}
(** Compute the reward distribution between frozen and spendable according to:
- the [full_staking_balance] of the delegate composed of the [own_frozen]
and [staked_frozen] parts (the delegated part is ignored).
- the [stake] of the delegate composed of the [frozen] deposits and the
[weighted_delegated] tokens.
- the [edge_of_baking_over_staking_billionth] parameter set by the baker in 1_000_000_000th
- the [rewards] to be distributed
Preconditions:
- 0 <= [edge_of_baking_over_staking_billionth] <= 1_000_000_000
Rounding favors:
- staking over delegation
- baking over staking
In case the delegate's stake is zero, everything goes to the spendable balance.
*)
let compute_reward_distrib
~adaptive_issuance_global_limit_of_staking_over_baking delegate_parameters
~full_staking_balance ~stake ~(rewards : Tez_repr.t) =
let open Result_syntax in
let ({frozen; weighted_delegated} : Stake_repr.t) = stake in
let* total_stake = Tez_repr.(frozen +? weighted_delegated) in
if Tez_repr.(total_stake <= zero) then
return
{
to_spendable = rewards;
to_baker_from_staking = Tez_repr.zero;
to_baker_from_edge_over_stakers = Tez_repr.zero;
to_stakers = Tez_repr.zero;
}
else
let* to_spendable =
Tez_repr.mul_ratio
~rounding:`Down
rewards
~num:(Tez_repr.to_mutez weighted_delegated)
~den:(Tez_repr.to_mutez total_stake)
in
let* to_frozen = Tez_repr.(rewards -? to_spendable) in
let* {baker_part; stakers_part} =
share
~adaptive_issuance_global_limit_of_staking_over_baking
delegate_parameters
~rounding:`Towards_baker
~full_staking_balance
to_frozen
in
let to_baker_from_staking = baker_part in
let* to_baker_from_edge_over_stakers =
Tez_repr.mul_ratio
~rounding:`Up
stakers_part
~num:
(Int64.of_int32
delegate_parameters.edge_of_baking_over_staking_billionth)
~den:1_000_000_000L
in
let* to_stakers =
Tez_repr.(stakers_part -? to_baker_from_edge_over_stakers)
in
return
{
to_baker_from_staking;
to_baker_from_edge_over_stakers;
to_stakers;
to_spendable;
}
let share ~rounding ctxt delegate amount =
let open Lwt_result_syntax in
let* delegate_parameters =
Delegate_staking_parameters.of_delegate ctxt delegate
in
let* full_staking_balance =
Stake_storage.get_full_staking_balance ctxt delegate
in
Lwt.return
(share
~adaptive_issuance_global_limit_of_staking_over_baking:
(Constants_storage
.adaptive_issuance_global_limit_of_staking_over_baking
ctxt)
delegate_parameters
~rounding
~full_staking_balance
amount)
let compute_reward_distrib ctxt delegate stake rewards =
let open Lwt_result_syntax in
let* (delegate_parameters : Staking_parameters_repr.t) =
Delegate_staking_parameters.of_delegate ctxt delegate
in
let* full_staking_balance =
Stake_storage.get_full_staking_balance ctxt delegate
in
Lwt.return
@@ compute_reward_distrib
~adaptive_issuance_global_limit_of_staking_over_baking:
(Constants_storage
.adaptive_issuance_global_limit_of_staking_over_baking
ctxt)
delegate_parameters
~full_staking_balance
~stake
~rewards
let pay_rewards ctxt ?active_stake ~source ~delegate rewards =
let open Lwt_result_syntax in
let* active_stake =
match active_stake with
| Some active_stake -> return active_stake
| None ->
let*? stake_distrib =
Raw_context.stake_distribution_for_current_cycle ctxt
in
return
(Option.value
(Signature.Public_key_hash.Map.find delegate stake_distrib)
~default:Stake_repr.zero)
in
let* {
to_baker_from_staking;
to_baker_from_edge_over_stakers;
to_stakers;
to_spendable;
} =
compute_reward_distrib ctxt delegate active_stake rewards
in
let* ctxt, balance_updates_frozen_rewards_baker =
Token.transfer
ctxt
source
(`Frozen_deposits (Frozen_staker_repr.baker delegate))
to_baker_from_staking
in
let* ctxt, balance_updates_frozen_rewards_baker_edge =
Token.transfer
ctxt
source
(`Frozen_deposits (Frozen_staker_repr.baker_edge delegate))
to_baker_from_edge_over_stakers
in
let* ctxt, balance_updates_frozen_rewards_stakers =
Token.transfer
ctxt
source
(`Frozen_deposits (Frozen_staker_repr.shared_between_stakers ~delegate))
to_stakers
in
let+ ctxt, balance_updates_spendable_rewards =
Token.transfer
ctxt
source
(`Contract (Contract_repr.Implicit delegate))
to_spendable
in
( ctxt,
balance_updates_frozen_rewards_baker
@ balance_updates_frozen_rewards_baker_edge
@ balance_updates_frozen_rewards_stakers @ balance_updates_spendable_rewards
)