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import * as _ from 'lodash';
import { AsyncMethod, ContractWrappersError, SyncMethod } from '../types';
import { constants } from './constants';
type ErrorTransformer = (err: Error) => Error;
const contractCallErrorTransformer = (error: Error) => {
if (_.includes(error.message, constants.INVALID_JUMP_PATTERN)) {
return new Error(ContractWrappersError.InvalidJump);
}
if (_.includes(error.message, constants.OUT_OF_GAS_PATTERN)) {
return new Error(ContractWrappersError.OutOfGas);
}
if (_.includes(error.message, constants.REVERT)) {
const revertReason = error.message.split(constants.REVERT)[1].trim();
return new Error(revertReason);
}
return error;
};
const schemaErrorTransformer = (error: Error) => {
if (_.includes(error.message, constants.INVALID_TAKER_FORMAT)) {
const errMsg =
'Order taker must be of type string. If you want anyone to be able to fill an order - pass NULL_ADDRESS';
return new Error(errMsg);
}
return error;
};
const signatureRequestErrorTransformer = (error: Error) => {
if (_.includes(error.message, constants.USER_DENIED_SIGNATURE_PATTERN)) {
const errMsg = ContractWrappersError.SignatureRequestDenied;
return new Error(errMsg);
}
return error;
};
/**
* Source: https://stackoverflow.com/a/29837695/3546986
*/
const asyncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
const asyncErrorHandlingDecorator = (
_target: object,
_key: string | symbol,
descriptor: TypedPropertyDescriptor<AsyncMethod>,
) => {
const originalMethod = descriptor.value as AsyncMethod;
// Do not use arrow syntax here. Use a function expression in
// order to use the correct value of `this` in this method
// tslint:disable-next-line:only-arrow-functions
descriptor.value = async function(...args: any[]): Promise<any> {
try {
const result = await originalMethod.apply(this, args); // tslint:disable-line:no-invalid-this
return result;
} catch (error) {
const transformedError = errorTransformer(error);
throw transformedError;
}
};
return descriptor;
};
return asyncErrorHandlingDecorator;
};
const syncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
const syncErrorHandlingDecorator = (
_target: object,
_key: string | symbol,
descriptor: TypedPropertyDescriptor<SyncMethod>,
) => {
const originalMethod = descriptor.value as SyncMethod;
// Do not use arrow syntax here. Use a function expression in
// order to use the correct value of `this` in this method
// tslint:disable-next-line:only-arrow-functions
descriptor.value = function(...args: any[]): any {
try {
const result = originalMethod.apply(this, args); // tslint:disable-line:no-invalid-this
return result;
} catch (error) {
const transformedError = errorTransformer(error);
throw transformedError;
}
};
return descriptor;
};
return syncErrorHandlingDecorator;
};
// _.flow(f, g) = f ∘ g
const zeroExErrorTransformer = _.flow(
schemaErrorTransformer,
contractCallErrorTransformer,
signatureRequestErrorTransformer,
);
export const decorators = {
asyncZeroExErrorHandler: asyncErrorHandlerFactory(zeroExErrorTransformer),
syncZeroExErrorHandler: syncErrorHandlerFactory(zeroExErrorTransformer),
};
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