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pezkuwi-subxt/polkadot/node/service/Cargo.toml
T
Gavin Wood fd5f9292f5 FRAME: Create TransactionExtension as a replacement for SignedExtension (#2280)
Closes #2160

First part of [Extrinsic
Horizon](https://github.com/paritytech/polkadot-sdk/issues/2415)

Introduces a new trait `TransactionExtension` to replace
`SignedExtension`. Introduce the idea of transactions which obey the
runtime's extensions and have according Extension data (né Extra data)
yet do not have hard-coded signatures.

Deprecate the terminology of "Unsigned" when used for
transactions/extrinsics owing to there now being "proper" unsigned
transactions which obey the extension framework and "old-style" unsigned
which do not. Instead we have __*General*__ for the former and
__*Bare*__ for the latter. (Ultimately, the latter will be phased out as
a type of transaction, and Bare will only be used for Inherents.)

Types of extrinsic are now therefore:
- Bare (no hardcoded signature, no Extra data; used to be known as
"Unsigned")
- Bare transactions (deprecated): Gossiped, validated with
`ValidateUnsigned` (deprecated) and the `_bare_compat` bits of
`TransactionExtension` (deprecated).
  - Inherents: Not gossiped, validated with `ProvideInherent`.
- Extended (Extra data): Gossiped, validated via `TransactionExtension`.
  - Signed transactions (with a hardcoded signature).
  - General transactions (without a hardcoded signature).

`TransactionExtension` differs from `SignedExtension` because:
- A signature on the underlying transaction may validly not be present.
- It may alter the origin during validation.
- `pre_dispatch` is renamed to `prepare` and need not contain the checks
present in `validate`.
- `validate` and `prepare` is passed an `Origin` rather than a
`AccountId`.
- `validate` may pass arbitrary information into `prepare` via a new
user-specifiable type `Val`.
- `AdditionalSigned`/`additional_signed` is renamed to
`Implicit`/`implicit`. It is encoded *for the entire transaction* and
passed in to each extension as a new argument to `validate`. This
facilitates the ability of extensions to acts as underlying crypto.

There is a new `DispatchTransaction` trait which contains only default
function impls and is impl'ed for any `TransactionExtension` impler. It
provides several utility functions which reduce some of the tedium from
using `TransactionExtension` (indeed, none of its regular functions
should now need to be called directly).

Three transaction version discriminator ("versions") are now
permissible:
- 0b000000100: Bare (used to be called "Unsigned"): contains Signature
or Extra (extension data). After bare transactions are no longer
supported, this will strictly identify an Inherents only.
- 0b100000100: Old-school "Signed" Transaction: contains Signature and
Extra (extension data).
- 0b010000100: New-school "General" Transaction: contains Extra
(extension data), but no Signature.

For the New-school General Transaction, it becomes trivial for authors
to publish extensions to the mechanism for authorizing an Origin, e.g.
through new kinds of key-signing schemes, ZK proofs, pallet state,
mutations over pre-authenticated origins or any combination of the
above.

## Code Migration

### NOW: Getting it to build

Wrap your `SignedExtension`s in `AsTransactionExtension`. This should be
accompanied by renaming your aggregate type in line with the new
terminology. E.g. Before:

```rust
/// The SignedExtension to the basic transaction logic.
pub type SignedExtra = (
	/* snip */
	MySpecialSignedExtension,
);
/// Unchecked extrinsic type as expected by this runtime.
pub type UncheckedExtrinsic =
	generic::UncheckedExtrinsic<Address, RuntimeCall, Signature, SignedExtra>;
```

After:

```rust
/// The extension to the basic transaction logic.
pub type TxExtension = (
	/* snip */
	AsTransactionExtension<MySpecialSignedExtension>,
);
/// Unchecked extrinsic type as expected by this runtime.
pub type UncheckedExtrinsic =
	generic::UncheckedExtrinsic<Address, RuntimeCall, Signature, TxExtension>;
```

You'll also need to alter any transaction building logic to add a
`.into()` to make the conversion happen. E.g. Before:

```rust
fn construct_extrinsic(
		/* snip */
) -> UncheckedExtrinsic {
	let extra: SignedExtra = (
		/* snip */
		MySpecialSignedExtension::new(/* snip */),
	);
	let payload = SignedPayload::new(call.clone(), extra.clone()).unwrap();
	let signature = payload.using_encoded(|e| sender.sign(e));
	UncheckedExtrinsic::new_signed(
		/* snip */
		Signature::Sr25519(signature),
		extra,
	)
}
```

After:

```rust
fn construct_extrinsic(
		/* snip */
) -> UncheckedExtrinsic {
	let tx_ext: TxExtension = (
		/* snip */
		MySpecialSignedExtension::new(/* snip */).into(),
	);
	let payload = SignedPayload::new(call.clone(), tx_ext.clone()).unwrap();
	let signature = payload.using_encoded(|e| sender.sign(e));
	UncheckedExtrinsic::new_signed(
		/* snip */
		Signature::Sr25519(signature),
		tx_ext,
	)
}
```

### SOON: Migrating to `TransactionExtension`

Most `SignedExtension`s can be trivially converted to become a
`TransactionExtension`. There are a few things to know.

- Instead of a single trait like `SignedExtension`, you should now
implement two traits individually: `TransactionExtensionBase` and
`TransactionExtension`.
- Weights are now a thing and must be provided via the new function `fn
weight`.

#### `TransactionExtensionBase`

This trait takes care of anything which is not dependent on types
specific to your runtime, most notably `Call`.

- `AdditionalSigned`/`additional_signed` is renamed to
`Implicit`/`implicit`.
- Weight must be returned by implementing the `weight` function. If your
extension is associated with a pallet, you'll probably want to do this
via the pallet's existing benchmarking infrastructure.

#### `TransactionExtension`

Generally:
- `pre_dispatch` is now `prepare` and you *should not reexecute the
`validate` functionality in there*!
- You don't get an account ID any more; you get an origin instead. If
you need to presume an account ID, then you can use the trait function
`AsSystemOriginSigner::as_system_origin_signer`.
- You get an additional ticket, similar to `Pre`, called `Val`. This
defines data which is passed from `validate` into `prepare`. This is
important since you should not be duplicating logic from `validate` to
`prepare`, you need a way of passing your working from the former into
the latter. This is it.
- This trait takes two type parameters: `Call` and `Context`. `Call` is
the runtime call type which used to be an associated type; you can just
move it to become a type parameter for your trait impl. `Context` is not
currently used and you can safely implement over it as an unbounded
type.
- There's no `AccountId` associated type any more. Just remove it.

Regarding `validate`:
- You get three new parameters in `validate`; all can be ignored when
migrating from `SignedExtension`.
- `validate` returns a tuple on success; the second item in the tuple is
the new ticket type `Self::Val` which gets passed in to `prepare`. If
you use any information extracted during `validate` (off-chain and
on-chain, non-mutating) in `prepare` (on-chain, mutating) then you can
pass it through with this. For the tuple's last item, just return the
`origin` argument.

Regarding `prepare`:
- This is renamed from `pre_dispatch`, but there is one change:
- FUNCTIONALITY TO VALIDATE THE TRANSACTION NEED NOT BE DUPLICATED FROM
`validate`!!
- (This is different to `SignedExtension` which was required to run the
same checks in `pre_dispatch` as in `validate`.)

Regarding `post_dispatch`:
- Since there are no unsigned transactions handled by
`TransactionExtension`, `Pre` is always defined, so the first parameter
is `Self::Pre` rather than `Option<Self::Pre>`.

If you make use of `SignedExtension::validate_unsigned` or
`SignedExtension::pre_dispatch_unsigned`, then:
- Just use the regular versions of these functions instead.
- Have your logic execute in the case that the `origin` is `None`.
- Ensure your transaction creation logic creates a General Transaction
rather than a Bare Transaction; this means having to include all
`TransactionExtension`s' data.
- `ValidateUnsigned` can still be used (for now) if you need to be able
to construct transactions which contain none of the extension data,
however these will be phased out in stage 2 of the Transactions Horizon,
so you should consider moving to an extension-centric design.

## TODO

- [x] Introduce `CheckSignature` impl of `TransactionExtension` to
ensure it's possible to have crypto be done wholly in a
`TransactionExtension`.
- [x] Deprecate `SignedExtension` and move all uses in codebase to
`TransactionExtension`.
  - [x] `ChargeTransactionPayment`
  - [x] `DummyExtension`
  - [x] `ChargeAssetTxPayment` (asset-tx-payment)
  - [x] `ChargeAssetTxPayment` (asset-conversion-tx-payment)
  - [x] `CheckWeight`
  - [x] `CheckTxVersion`
  - [x] `CheckSpecVersion`
  - [x] `CheckNonce`
  - [x] `CheckNonZeroSender`
  - [x] `CheckMortality`
  - [x] `CheckGenesis`
  - [x] `CheckOnlySudoAccount`
  - [x] `WatchDummy`
  - [x] `PrevalidateAttests`
  - [x] `GenericSignedExtension`
  - [x] `SignedExtension` (chain-polkadot-bulletin)
  - [x] `RefundSignedExtensionAdapter`
- [x] Implement `fn weight` across the board.
- [ ] Go through all pre-existing extensions which assume an account
signer and explicitly handle the possibility of another kind of origin.
- [x] `CheckNonce` should probably succeed in the case of a non-account
origin.
- [x] `CheckNonZeroSender` should succeed in the case of a non-account
origin.
- [x] `ChargeTransactionPayment` and family should fail in the case of a
non-account origin.
  - [ ] 
- [x] Fix any broken tests.

---------

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[package]
name = "polkadot-service"
rust-version = "1.60"
version = "7.0.0"
authors.workspace = true
edition.workspace = true
license.workspace = true
description = "Utils to tie different Polkadot components together and allow instantiation of a node."
[lints]
workspace = true
[dependencies]
# Substrate Client
sc-authority-discovery = { path = "../../../substrate/client/authority-discovery" }
babe = { package = "sc-consensus-babe", path = "../../../substrate/client/consensus/babe" }
beefy = { package = "sc-consensus-beefy", path = "../../../substrate/client/consensus/beefy" }
grandpa = { package = "sc-consensus-grandpa", path = "../../../substrate/client/consensus/grandpa" }
mmr-gadget = { path = "../../../substrate/client/merkle-mountain-range" }
sp-mmr-primitives = { path = "../../../substrate/primitives/merkle-mountain-range" }
sc-block-builder = { path = "../../../substrate/client/block-builder" }
sc-chain-spec = { path = "../../../substrate/client/chain-spec" }
sc-client-api = { path = "../../../substrate/client/api" }
sc-client-db = { path = "../../../substrate/client/db" }
sc-consensus = { path = "../../../substrate/client/consensus/common" }
sc-consensus-slots = { path = "../../../substrate/client/consensus/slots" }
sc-executor = { path = "../../../substrate/client/executor" }
sc-network = { path = "../../../substrate/client/network" }
sc-network-common = { path = "../../../substrate/client/network/common" }
sc-network-sync = { path = "../../../substrate/client/network/sync" }
sc-transaction-pool = { path = "../../../substrate/client/transaction-pool" }
sc-transaction-pool-api = { path = "../../../substrate/client/transaction-pool/api" }
sc-sync-state-rpc = { path = "../../../substrate/client/sync-state-rpc" }
sc-keystore = { path = "../../../substrate/client/keystore" }
sc-basic-authorship = { path = "../../../substrate/client/basic-authorship" }
sc-offchain = { path = "../../../substrate/client/offchain" }
sc-sysinfo = { path = "../../../substrate/client/sysinfo" }
service = { package = "sc-service", path = "../../../substrate/client/service", default-features = false }
telemetry = { package = "sc-telemetry", path = "../../../substrate/client/telemetry" }
# Substrate Primitives
sp-authority-discovery = { path = "../../../substrate/primitives/authority-discovery" }
consensus_common = { package = "sp-consensus", path = "../../../substrate/primitives/consensus/common" }
beefy-primitives = { package = "sp-consensus-beefy", path = "../../../substrate/primitives/consensus/beefy" }
grandpa_primitives = { package = "sp-consensus-grandpa", path = "../../../substrate/primitives/consensus/grandpa" }
sp-inherents = { path = "../../../substrate/primitives/inherents" }
sp-keyring = { path = "../../../substrate/primitives/keyring" }
sp-api = { path = "../../../substrate/primitives/api" }
sp-block-builder = { path = "../../../substrate/primitives/block-builder" }
sp-blockchain = { path = "../../../substrate/primitives/blockchain" }
sp-core = { path = "../../../substrate/primitives/core" }
sp-io = { path = "../../../substrate/primitives/io" }
sp-keystore = { path = "../../../substrate/primitives/keystore" }
sp-offchain = { package = "sp-offchain", path = "../../../substrate/primitives/offchain" }
sp-runtime = { path = "../../../substrate/primitives/runtime" }
sp-session = { path = "../../../substrate/primitives/session" }
sp-storage = { path = "../../../substrate/primitives/storage" }
sp-transaction-pool = { path = "../../../substrate/primitives/transaction-pool" }
pallet-transaction-payment = { path = "../../../substrate/frame/transaction-payment" }
sp-timestamp = { path = "../../../substrate/primitives/timestamp" }
sp-consensus-babe = { path = "../../../substrate/primitives/consensus/babe" }
sp-state-machine = { path = "../../../substrate/primitives/state-machine" }
sp-weights = { path = "../../../substrate/primitives/weights" }
sp-version = { path = "../../../substrate/primitives/version" }
# Substrate Pallets
pallet-babe = { path = "../../../substrate/frame/babe" }
pallet-im-online = { path = "../../../substrate/frame/im-online" }
pallet-staking = { path = "../../../substrate/frame/staking" }
pallet-transaction-payment-rpc-runtime-api = { path = "../../../substrate/frame/transaction-payment/rpc/runtime-api" }
frame-system = { path = "../../../substrate/frame/system" }
# Substrate Other
frame-system-rpc-runtime-api = { path = "../../../substrate/frame/system/rpc/runtime-api" }
prometheus-endpoint = { package = "substrate-prometheus-endpoint", path = "../../../substrate/utils/prometheus" }
frame-support = { path = "../../../substrate/frame/support" }
frame-benchmarking-cli = { path = "../../../substrate/utils/frame/benchmarking-cli" }
frame-benchmarking = { path = "../../../substrate/frame/benchmarking" }
# External Crates
async-trait = "0.1.74"
futures = "0.3.21"
hex-literal = "0.4.1"
is_executable = "1.0.1"
gum = { package = "tracing-gum", path = "../gum" }
log = { workspace = true, default-features = true }
schnellru = "0.2.1"
serde = { features = ["derive"], workspace = true, default-features = true }
serde_json = { workspace = true, default-features = true }
thiserror = { workspace = true }
kvdb = "0.13.0"
kvdb-rocksdb = { version = "0.19.0", optional = true }
parity-db = { version = "0.4.12", optional = true }
codec = { package = "parity-scale-codec", version = "3.6.1" }
parking_lot = "0.12.1"
bitvec = { version = "1.0.1", optional = true }
# Polkadot
polkadot-core-primitives = { path = "../../core-primitives" }
polkadot-node-core-parachains-inherent = { path = "../core/parachains-inherent" }
polkadot-overseer = { path = "../overseer" }
polkadot-parachain-primitives = { path = "../../parachain" }
polkadot-primitives = { path = "../../primitives" }
polkadot-node-primitives = { path = "../primitives" }
polkadot-rpc = { path = "../../rpc" }
polkadot-node-subsystem = { path = "../subsystem" }
polkadot-node-subsystem-util = { path = "../subsystem-util" }
polkadot-node-subsystem-types = { path = "../subsystem-types" }
polkadot-runtime-parachains = { path = "../../runtime/parachains" }
polkadot-node-network-protocol = { path = "../network/protocol" }
# Polkadot Runtime Constants
rococo-runtime-constants = { path = "../../runtime/rococo/constants", optional = true }
westend-runtime-constants = { path = "../../runtime/westend/constants", optional = true }
# Polkadot Runtimes
westend-runtime = { path = "../../runtime/westend", optional = true }
rococo-runtime = { path = "../../runtime/rococo", optional = true }
# Polkadot Subsystems
polkadot-approval-distribution = { path = "../network/approval-distribution", optional = true }
polkadot-availability-bitfield-distribution = { path = "../network/bitfield-distribution", optional = true }
polkadot-availability-distribution = { path = "../network/availability-distribution", optional = true }
polkadot-availability-recovery = { path = "../network/availability-recovery", optional = true }
polkadot-collator-protocol = { path = "../network/collator-protocol", optional = true }
polkadot-dispute-distribution = { path = "../network/dispute-distribution", optional = true }
polkadot-gossip-support = { path = "../network/gossip-support", optional = true }
polkadot-network-bridge = { path = "../network/bridge", optional = true }
polkadot-node-collation-generation = { path = "../collation-generation", optional = true }
polkadot-node-core-approval-voting = { path = "../core/approval-voting", optional = true }
polkadot-node-core-av-store = { path = "../core/av-store", optional = true }
polkadot-node-core-backing = { path = "../core/backing", optional = true }
polkadot-node-core-bitfield-signing = { path = "../core/bitfield-signing", optional = true }
polkadot-node-core-candidate-validation = { path = "../core/candidate-validation", optional = true }
polkadot-node-core-chain-api = { path = "../core/chain-api", optional = true }
polkadot-node-core-chain-selection = { path = "../core/chain-selection", optional = true }
polkadot-node-core-dispute-coordinator = { path = "../core/dispute-coordinator", optional = true }
polkadot-node-core-prospective-parachains = { path = "../core/prospective-parachains", optional = true }
polkadot-node-core-provisioner = { path = "../core/provisioner", optional = true }
polkadot-node-core-pvf = { path = "../core/pvf", optional = true }
polkadot-node-core-pvf-checker = { path = "../core/pvf-checker", optional = true }
polkadot-node-core-runtime-api = { path = "../core/runtime-api", optional = true }
polkadot-statement-distribution = { path = "../network/statement-distribution", optional = true }
[dev-dependencies]
polkadot-test-client = { path = "../test/client" }
polkadot-node-subsystem-test-helpers = { path = "../subsystem-test-helpers" }
test-helpers = { package = "polkadot-primitives-test-helpers", path = "../../primitives/test-helpers" }
env_logger = "0.9.0"
assert_matches = "1.5.0"
serial_test = "2.0.0"
tempfile = "3.2"
[features]
default = ["db", "full-node"]
db = ["service/rocksdb"]
full-node = [
"kvdb-rocksdb",
"parity-db",
"polkadot-approval-distribution",
"polkadot-availability-bitfield-distribution",
"polkadot-availability-distribution",
"polkadot-availability-recovery",
"polkadot-collator-protocol",
"polkadot-dispute-distribution",
"polkadot-gossip-support",
"polkadot-network-bridge",
"polkadot-node-collation-generation",
"polkadot-node-core-approval-voting",
"polkadot-node-core-av-store",
"polkadot-node-core-backing",
"polkadot-node-core-bitfield-signing",
"polkadot-node-core-candidate-validation",
"polkadot-node-core-chain-api",
"polkadot-node-core-chain-selection",
"polkadot-node-core-dispute-coordinator",
"polkadot-node-core-prospective-parachains",
"polkadot-node-core-provisioner",
"polkadot-node-core-pvf",
"polkadot-node-core-pvf-checker",
"polkadot-node-core-runtime-api",
"polkadot-statement-distribution",
]
# Configure the native runtimes to use.
westend-native = ["bitvec", "westend-runtime", "westend-runtime-constants"]
rococo-native = ["bitvec", "rococo-runtime", "rococo-runtime-constants"]
runtime-benchmarks = [
"frame-benchmarking-cli/runtime-benchmarks",
"frame-benchmarking/runtime-benchmarks",
"frame-support/runtime-benchmarks",
"frame-system/runtime-benchmarks",
"pallet-babe/runtime-benchmarks",
"pallet-im-online/runtime-benchmarks",
"pallet-staking/runtime-benchmarks",
"pallet-transaction-payment/runtime-benchmarks",
"polkadot-parachain-primitives/runtime-benchmarks",
"polkadot-primitives/runtime-benchmarks",
"polkadot-runtime-parachains/runtime-benchmarks",
"polkadot-test-client/runtime-benchmarks",
"rococo-runtime?/runtime-benchmarks",
"sc-client-db/runtime-benchmarks",
"service/runtime-benchmarks",
"sp-runtime/runtime-benchmarks",
"westend-runtime?/runtime-benchmarks",
]
try-runtime = [
"frame-support/try-runtime",
"frame-system/try-runtime",
"pallet-babe/try-runtime",
"pallet-im-online/try-runtime",
"pallet-staking/try-runtime",
"pallet-transaction-payment/try-runtime",
"polkadot-runtime-parachains/try-runtime",
"rococo-runtime?/try-runtime",
"sp-runtime/try-runtime",
"westend-runtime?/try-runtime",
]
fast-runtime = [
"rococo-runtime?/fast-runtime",
"westend-runtime?/fast-runtime",
]
malus = ["full-node"]
runtime-metrics = [
"polkadot-runtime-parachains/runtime-metrics",
"rococo-runtime?/runtime-metrics",
"westend-runtime?/runtime-metrics",
]