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XChainBridge: Introduce sidechain support (XLS-38): (#4292)

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A bridge connects two blockchains: a locking chain and an issuing
chain (also called a mainchain and a sidechain). Both are independent
ledgers, with their own validators and potentially their own custom
transactions. Importantly, there is a way to move assets from the
locking chain to the issuing chain and a way to return those assets from
the issuing chain back to the locking chain: the bridge. This key
operation is called a cross-chain transfer. A cross-chain transfer is
not a single transaction. It happens on two chains, requires multiple
transactions, and involves an additional server type called a "witness".

A bridge does not exchange assets between two ledgers. Instead, it locks
assets on one ledger (the "locking chain") and represents those assets
with wrapped assets on another chain (the "issuing chain"). A good model
to keep in mind is a box with an infinite supply of wrapped assets.
Putting an asset from the locking chain into the box will release a
wrapped asset onto the issuing chain. Putting a wrapped asset from the
issuing chain back into the box will release one of the existing locking
chain assets back onto the locking chain. There is no other way to get
assets into or out of the box. Note that there is no way for the box to
"run out of" wrapped assets - it has an infinite supply.

Co-authored-by: Gregory Popovitch <greg7mdp@gmail.com>
This commit is contained in:
Scott Determan
2023-09-14 16:08:41 -04:00
committed by GitHub
parent 7fae1c1262
commit 649c11a78e
59 changed files with 12142 additions and 174 deletions
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146
src/test/rpc/AccountObjects_test.cpp
View File

@@ -23,6 +23,7 @@
#include <ripple/protocol/jss.h>
#include <test/jtx.h>
#include <test/jtx/AMM.h>
#include <test/jtx/xchain_bridge.h>
#include <boost/utility/string_ref.hpp>
@@ -550,7 +551,9 @@ public:
Account const gw{"gateway"};
auto const USD = gw["USD"];
Env env(*this);
auto const features =
supported_amendments() | FeatureBitset{featureXChainBridge};
Env env(*this, features);
// Make a lambda we can use to get "account_objects" easily.
auto acct_objs = [&env](
@@ -676,6 +679,142 @@ public:
BEAST_EXPECT(escrow[sfDestination.jsonName] == gw.human());
BEAST_EXPECT(escrow[sfAmount.jsonName].asUInt() == 100'000'000);
}
{
// Create a bridge
test::jtx::XChainBridgeObjects x;
Env scEnv(*this, envconfig(port_increment, 3), features);
x.createScBridgeObjects(scEnv);
auto scenv_acct_objs = [&](Account const& acct, char const* type) {
Json::Value params;
params[jss::account] = acct.human();
params[jss::type] = type;
params[jss::ledger_index] = "validated";
return scEnv.rpc("json", "account_objects", to_string(params));
};
Json::Value const resp =
scenv_acct_objs(Account::master, jss::bridge);
BEAST_EXPECT(acct_objs_is_size(resp, 1));
auto const& acct_bridge =
resp[jss::result][jss::account_objects][0u];
BEAST_EXPECT(
acct_bridge[sfAccount.jsonName] == Account::master.human());
BEAST_EXPECT(
acct_bridge[sfLedgerEntryType.getJsonName()] == "Bridge");
BEAST_EXPECT(
acct_bridge[sfXChainClaimID.getJsonName()].asUInt() == 0);
BEAST_EXPECT(
acct_bridge[sfXChainAccountClaimCount.getJsonName()].asUInt() ==
0);
BEAST_EXPECT(
acct_bridge[sfXChainAccountCreateCount.getJsonName()]
.asUInt() == 0);
BEAST_EXPECT(
acct_bridge[sfMinAccountCreateAmount.getJsonName()].asUInt() ==
20000000);
BEAST_EXPECT(
acct_bridge[sfSignatureReward.getJsonName()].asUInt() ==
1000000);
BEAST_EXPECT(acct_bridge[sfXChainBridge.getJsonName()] == x.jvb);
}
{
// Alice and Bob create a xchain sequence number that we can look
// for in the ledger.
test::jtx::XChainBridgeObjects x;
Env scEnv(*this, envconfig(port_increment, 3), features);
x.createScBridgeObjects(scEnv);
scEnv(
xchain_create_claim_id(x.scAlice, x.jvb, x.reward, x.mcAlice));
scEnv.close();
scEnv(xchain_create_claim_id(x.scBob, x.jvb, x.reward, x.mcBob));
scEnv.close();
auto scenv_acct_objs = [&](Account const& acct, char const* type) {
Json::Value params;
params[jss::account] = acct.human();
params[jss::type] = type;
params[jss::ledger_index] = "validated";
return scEnv.rpc("json", "account_objects", to_string(params));
};
{
// Find the xchain sequence number for Andrea.
Json::Value const resp =
scenv_acct_objs(x.scAlice, jss::xchain_owned_claim_id);
BEAST_EXPECT(acct_objs_is_size(resp, 1));
auto const& xchain_seq =
resp[jss::result][jss::account_objects][0u];
BEAST_EXPECT(
xchain_seq[sfAccount.jsonName] == x.scAlice.human());
BEAST_EXPECT(
xchain_seq[sfXChainClaimID.getJsonName()].asUInt() == 1);
}
{
// and the one for Bob
Json::Value const resp =
scenv_acct_objs(x.scBob, jss::xchain_owned_claim_id);
BEAST_EXPECT(acct_objs_is_size(resp, 1));
auto const& xchain_seq =
resp[jss::result][jss::account_objects][0u];
BEAST_EXPECT(xchain_seq[sfAccount.jsonName] == x.scBob.human());
BEAST_EXPECT(
xchain_seq[sfXChainClaimID.getJsonName()].asUInt() == 2);
}
}
{
test::jtx::XChainBridgeObjects x;
Env scEnv(*this, envconfig(port_increment, 3), features);
x.createScBridgeObjects(scEnv);
auto const amt = XRP(1000);
// send first batch of account create attestations, so the
// xchain_create_account_claim_id should be present on the door
// account (Account::master) to collect the signatures until a
// quorum is reached
scEnv(test::jtx::create_account_attestation(
x.scAttester,
x.jvb,
x.mcCarol,
amt,
x.reward,
x.payees[0],
true,
1,
x.scuAlice,
x.signers[0]));
scEnv.close();
auto scenv_acct_objs = [&](Account const& acct, char const* type) {
Json::Value params;
params[jss::account] = acct.human();
params[jss::type] = type;
params[jss::ledger_index] = "validated";
return scEnv.rpc("json", "account_objects", to_string(params));
};
{
// Find the xchain_create_account_claim_id
Json::Value const resp = scenv_acct_objs(
Account::master, jss::xchain_owned_create_account_claim_id);
BEAST_EXPECT(acct_objs_is_size(resp, 1));
auto const& xchain_create_account_claim_id =
resp[jss::result][jss::account_objects][0u];
BEAST_EXPECT(
xchain_create_account_claim_id[sfAccount.jsonName] ==
Account::master.human());
BEAST_EXPECT(
xchain_create_account_claim_id[sfXChainAccountCreateCount
.getJsonName()]
.asUInt() == 1);
}
}
// gw creates an offer that we can look for in the ledger.
env(offer(gw, USD(7), XRP(14)));
env.close();
@@ -690,7 +829,8 @@ public:
BEAST_EXPECT(offer[sfTakerPays.jsonName][jss::value].asUInt() == 7);
}
{
// Create a payment channel from qw to alice that we can look for.
// Create a payment channel from qw to alice that we can look
// for.
Json::Value jvPayChan;
jvPayChan[jss::TransactionType] = jss::PaymentChannelCreate;
jvPayChan[jss::Flags] = tfUniversal;
@@ -715,7 +855,7 @@ public:
payChan[sfSettleDelay.jsonName].asUInt() == 24 * 60 * 60);
}
// Make gw multisigning by adding a signerList.
env(signers(gw, 6, {{alice, 7}}));
env(jtx::signers(gw, 6, {{alice, 7}}));
env.close();
{
// Find the signer list.