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storage_contract.func
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#include "stdlib.func";
#include "constants.func";
const CHUNK_SIZE = 64;
const fee::receipt_value = 20000000;
const fee::storage = 10000000;
{-
storage#_ active:Bool
balance:Coins provider:MsgAddress
merkle_hash:uint256 file_size:uint64 next_proof_byte:uint64
rate_per_mb_day:Coins
max_span:uint32 last_proof_time:uint32
^[client:MsgAddress torrent_hash:uint256] = Storage;
-}
(slice, int) begin_parse_special(cell c) asm "x{D739} s,";
int check_proof(int merkle_hash, int byte_to_proof, int file_size, cell file_dict_proof) {
(slice cs, int special) = file_dict_proof.begin_parse_special();
if (~ special) {
return false;
}
if (cs~load_uint(8) != 3) { ;; Merkle proof
return false;
}
if (cs~load_uint(256) != merkle_hash) {
return false;
}
cell file_dict = cs~load_ref();
int key_len = 0;
while ((CHUNK_SIZE << key_len) < file_size) {
key_len += 1;
}
(slice data, int found?) = file_dict.udict_get?(key_len, byte_to_proof / CHUNK_SIZE);
if(found?) {
return true;
}
return false;
}
() add_to_balance(int amount) impure inline_ref {
var ds = get_data().begin_parse();
var ( active, balance, residue ) = (ds~load_int(1), ds~load_grams(), ds);
balance += amount;
begin_cell()
.store_int(active, 1)
.store_coins(balance)
.store_slice(residue)
.end_cell().set_data();
}
(slice, int) get_client_data(ds) {
ds = ds.preload_ref().begin_parse();
return (ds~load_msg_addr(), ds~load_uint(256));
}
() recv_internal(int msg_value, cell in_msg_full, slice in_msg_body) impure {
slice cs = in_msg_full.begin_parse();
int flags = cs~load_uint(4);
if (flags & 1) { ;; ignore all bounced messages
return ();
}
slice sender_address = cs~load_msg_addr();
int op = in_msg_body~load_uint(32);
int query_id = in_msg_body~load_uint(64);
if(op == op::new_storage_contract) {
add_to_balance(msg_value - 2 * fee::receipt_value);
var (client, torrent_hash) = get_client_data(get_data().begin_parse());
var msg = begin_cell()
.store_uint(0x18, 6)
.store_slice(client)
.store_coins(fee::receipt_value)
.store_uint(0, 1 + 4 + 4 + 64 + 32 + 1 + 1)
.store_uint(op::contract_registered, 32)
.store_uint(query_id, 64)
.store_uint(torrent_hash, 256)
.end_cell();
send_raw_message(msg, 0);
}
if (op == op::accept_contract) {
var ds = get_data().begin_parse();
(int active, int balance, slice provider, slice rest) =
(ds~load_int(1), ds~load_coins(), ds~load_msg_addr(), ds);
throw_unless(error::contract_already_active, ~ active);
throw_unless(error::unauthorized, equal_slice_bits(sender_address, provider));
begin_cell()
.store_int(true, 1)
.store_coins(balance)
.store_slice(provider)
.store_slice(rest)
.end_cell().set_data();
var (client, torrent_hash) = get_client_data(rest);
var msg = begin_cell()
.store_uint(0x18, 6)
.store_slice(client)
.store_coins(fee::receipt_value)
.store_uint(0, 1 + 4 + 4 + 64 + 32 + 1 + 1)
.store_uint(op::contract_accepted, 32)
.store_uint(cur_lt(), 64)
.store_uint(torrent_hash, 256)
.end_cell();
send_raw_message(msg, 0);
}
if (op == op::topup_balance) {
return add_to_balance(msg_value);
}
if (op == op::close_contract) {
var ds = get_data().begin_parse();
(int active, int balance, slice provider, slice rest) =
(ds~load_int(1), ds~load_coins(), ds~load_msg_addr(), ds);
var (client, torrent_hash) = get_client_data(rest);
throw_unless(error::unauthorized, equal_slice_bits(sender_address, provider));
var client_msg = begin_cell()
.store_uint(0x18, 6)
.store_slice(client)
.store_coins(balance)
.store_uint(0, 1 + 4 + 4 + 64 + 32 + 1 + 1)
.store_uint(op::storage_contract_destruction, 32)
.store_uint(cur_lt(), 64)
.store_uint(torrent_hash, 256)
.end_cell();
if(~ active) {
return send_raw_message(client_msg, 128 + 32);
}
send_raw_message(client_msg, 64);
var provider_msg = begin_cell()
.store_uint(0x18, 6)
.store_slice(provider)
.store_coins(0)
.store_uint(0, 1 + 4 + 4 + 64 + 32 + 1 + 1)
.store_uint(op::storage_contract_destruction, 32)
.store_uint(cur_lt(), 64)
.store_uint(torrent_hash, 256)
.end_cell();
return send_raw_message(provider_msg, 128 + 32);
}
if (op == op::withdraw) {
var ds = get_data().begin_parse();
(int active, int balance, slice provider) = (ds~load_int(1), ds~load_coins(), ds~load_msg_addr());
throw_unless(error::contract_not_active, active);
throw_unless(error::unauthorized, equal_slice_bits(sender_address, provider));
if(balance > 0) {
raw_reserve(balance + fee::storage, 2);
}
var msg = begin_cell()
.store_uint(0x18, 6)
.store_slice(provider)
.store_coins(fee::receipt_value)
.store_uint(0, 1 + 4 + 4 + 64 + 32 + 1 + 1)
.store_uint(op::bounty, 32)
.store_uint(query_id, 64)
.end_cell();
send_raw_message(msg, 128 + 32);
}
if (op == op::proof_storage) {
cell file_dict_proof = in_msg_body~load_ref();
var ds = get_data().begin_parse();
var ( active,
balance,
provider,
merkle_hash,
file_size,
next_proof,
rate_per_mb_day,
max_span,
last_proof_time,
client_data) = (ds~load_int(1),
ds~load_coins(),
ds~load_msg_addr(),
ds~load_uint(256),
ds~load_uint(64),
ds~load_uint(64),
ds~load_coins(),
ds~load_uint(32),
ds~load_uint(32),
ds~load_ref());
throw_unless(error::contract_not_active, active);
throw_unless(error::unauthorized, equal_slice_bits(sender_address, provider));
throw_unless(error::wrong_proof, check_proof(merkle_hash, next_proof, file_size, file_dict_proof));
next_proof = rand(file_size);
int actual_span = min(now() - last_proof_time, max_span);
int bounty = muldiv(file_size * rate_per_mb_day, actual_span, 24 * 60 * 60 * 1024 * 1024);
balance = max(0, balance - bounty);
last_proof_time = now();
begin_cell()
.store_int(true, 1)
.store_coins(balance)
.store_slice(provider)
.store_uint(merkle_hash, 256)
.store_uint(file_size, 64)
.store_uint(next_proof, 64)
.store_coins(rate_per_mb_day)
.store_uint(max_span, 32)
.store_uint(last_proof_time, 32)
.store_ref(client_data)
.end_cell().set_data();
;; Send remaining balance back
cell msg = begin_cell()
.store_uint(0x18, 6)
.store_slice(sender_address)
.store_uint(0, 4 + 1 + 4 + 4 + 64 + 32 + 1 + 1)
.end_cell();
send_raw_message(msg, 64 + 2);
}
}
_ get_contract_data() method_id {
var ds = get_data().begin_parse();
var ( active,
balance,
provider,
merkle_hash,
file_size,
next_proof,
rate_per_mb_day,
max_span,
last_proof_time,
rest) = (ds~load_int(1),
ds~load_coins(),
ds~load_msg_addr(),
ds~load_uint(256),
ds~load_uint(64),
ds~load_uint(64),
ds~load_coins(),
ds~load_uint(32),
ds~load_uint(32),
ds);
var (client, torrent_hash) = get_client_data(rest);
return (active, balance, provider, merkle_hash, file_size,
next_proof, rate_per_mb_day, max_span, last_proof_time,
client, torrent_hash);
}
_ get_torrent_hash() method_id {
var (active, balance, provider, merkle_hash, file_size,
next_proof, rate_per_mb_day, max_span, last_proof_time,
client, torrent_hash) = get_contract_data();
return torrent_hash;
}
_ is_active() method_id {
return get_data().begin_parse().preload_int(1);
}
;; next_proof, last_proof_time, max_span
_ get_next_proof_info() method_id {
var (active, balance, provider, merkle_hash, file_size,
next_proof, rate_per_mb_day, max_span, last_proof_time,
client, torrent_hash) = get_contract_data();
return (next_proof, last_proof_time, max_span);
}