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cf-op-generator.ts
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cf-op-generator.ts
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import * as ethers from "ethers";
import { Instruction } from "../../instructions";
import { CfState, Context } from "../../state";
import {
ActionName,
Address,
CanonicalPeerBalance,
H256,
InternalMessage,
PeerBalance
} from "../../types";
import { CfOpGenerator, getFirstResult } from "../middleware";
import { CfOpInstall } from "./cf-op-install";
import { CfOpSetState } from "./cf-op-setstate";
import { CfOpSetup } from "./cf-op-setup";
import { CfOpUninstall } from "./cf-op-uninstall";
import {
CfAppInterface,
CfFreeBalance,
CfOperation,
CfStateChannel,
Terms
} from "./types";
/**
* Middleware to be used and registered with the VM on OP_GENERATE instructions
* to generate CfOperations. When combined with signatures from all parties
* in the state channel, the CfOperation transitions the state to that
* yielded by STATE_TRANSITION_PROPOSE.
*/
export class EthCfOpGenerator extends CfOpGenerator {
public generate(
message: InternalMessage,
next: Function,
context: Context,
cfState: CfState
): CfOperation {
const proposedState = getFirstResult(
Instruction.STATE_TRANSITION_PROPOSE,
context.results
).value;
let op;
if (message.actionName === ActionName.UPDATE) {
op = this.update(message, context, cfState, proposedState.state);
} else if (message.actionName === ActionName.SETUP) {
op = this.setup(message, context, cfState, proposedState.state);
} else if (message.actionName === ActionName.INSTALL) {
op = this.install(
message,
context,
cfState,
proposedState.state,
proposedState.cfAddr
);
} else if (message.actionName === ActionName.UNINSTALL) {
op = this.uninstall(message, context, cfState, proposedState.state);
}
return op;
}
public update(
message: InternalMessage,
context: Context,
cfState: CfState,
proposedUpdate: any
): CfOperation {
const multisig: Address = message.clientMessage.multisigAddress;
if (message.clientMessage.appId === undefined) {
// FIXME: handle more gracefully
throw Error("update message must have appId set");
}
const appChannel =
proposedUpdate[multisig].appChannels[message.clientMessage.appId];
// TODO: ensure these members are typed instead of having to reconstruct
// class instances
appChannel.cfApp = new CfAppInterface(
appChannel.cfApp.address,
appChannel.cfApp.applyAction,
appChannel.cfApp.resolve,
appChannel.cfApp.getTurnTaker,
appChannel.cfApp.isStateTerminal,
appChannel.cfApp.abiEncoding
);
appChannel.terms = new Terms(
appChannel.terms.assetType,
appChannel.terms.limit,
appChannel.terms.token
);
const signingKeys = [
message.clientMessage.fromAddress,
message.clientMessage.toAddress
];
signingKeys.sort((addrA: Address, addrB: Address) => {
return new ethers.utils.BigNumber(addrA).lt(addrB) ? -1 : 1;
});
return new CfOpSetState(
cfState.networkContext,
multisig,
// FIXME: signing keys should be app-specific ephemeral keys
signingKeys,
appChannel.appStateHash,
appChannel.uniqueId,
appChannel.terms,
appChannel.cfApp,
appChannel.localNonce,
appChannel.timeout
);
}
public setup(
message: InternalMessage,
context: Context,
cfState: CfState,
proposedSetup: any
): CfOperation {
const multisig: Address = message.clientMessage.multisigAddress;
const freeBalance: CfFreeBalance = proposedSetup[multisig].freeBalance;
const nonce = freeBalance.dependencyNonce;
const cfFreeBalance = new CfFreeBalance(
freeBalance.alice,
freeBalance.aliceBalance,
freeBalance.bob,
freeBalance.bobBalance,
freeBalance.uniqueId,
freeBalance.localNonce,
freeBalance.timeout,
freeBalance.dependencyNonce
);
const canon = CanonicalPeerBalance.canonicalize(
new PeerBalance(message.clientMessage.fromAddress, 0),
new PeerBalance(message.clientMessage.toAddress, 0)
);
const signingKeys = [canon.peerA.address, canon.peerB.address];
const cfStateChannel = new CfStateChannel(
cfState.networkContext,
multisig,
signingKeys,
CfFreeBalance.contractInterface(cfState.networkContext),
CfFreeBalance.terms(),
freeBalance.timeout,
freeBalance.uniqueId
);
return new CfOpSetup(
cfState.networkContext,
multisig,
cfStateChannel,
cfFreeBalance,
nonce
);
}
public install(
message: InternalMessage,
context: Context,
cfState: CfState,
proposedInstall: any,
cfAddr: H256
) {
const channel = proposedInstall[message.clientMessage.multisigAddress];
const freeBalance = channel.freeBalance;
const multisig: Address = message.clientMessage.multisigAddress;
const appChannel = channel.appChannels[cfAddr];
const signingKeys = [appChannel.keyA, appChannel.keyB];
const app = new CfStateChannel(
cfState.networkContext,
multisig,
signingKeys,
appChannel.cfApp,
appChannel.terms,
appChannel.timeout,
appChannel.uniqueId
);
const cfFreeBalance = new CfFreeBalance(
freeBalance.alice,
freeBalance.aliceBalance,
freeBalance.bob,
freeBalance.bobBalance,
freeBalance.uniqueId,
freeBalance.localNonce,
freeBalance.timeout,
freeBalance.nonce
);
const op = new CfOpInstall(
cfState.networkContext,
multisig,
app,
cfFreeBalance,
appChannel.dependencyNonce
);
return op;
}
public uninstall(
message: InternalMessage,
context: Context,
cfState: CfState,
proposedUninstall: any
): CfOperation {
const multisig: Address = message.clientMessage.multisigAddress;
const cfAddr = message.clientMessage.appId;
if (cfAddr === undefined) {
throw new Error("update message must have appId set");
}
const freeBalance = proposedUninstall[multisig].freeBalance;
const appChannel = proposedUninstall[multisig].appChannels[cfAddr];
const cfFreeBalance = new CfFreeBalance(
freeBalance.alice,
freeBalance.aliceBalance,
freeBalance.bob,
freeBalance.bobBalance,
freeBalance.uniqueId,
freeBalance.localNonce,
freeBalance.timeout,
freeBalance.nonce
);
const op = new CfOpUninstall(
cfState.networkContext,
multisig,
cfFreeBalance,
appChannel.dependencyNonce
);
return op;
}
}