diff options
Diffstat (limited to 'packages/pipeline/src/utils/transformers')
3 files changed, 45 insertions, 0 deletions
diff --git a/packages/pipeline/src/utils/transformers/big_number.ts b/packages/pipeline/src/utils/transformers/big_number.ts new file mode 100644 index 000000000..a0471a5e3 --- /dev/null +++ b/packages/pipeline/src/utils/transformers/big_number.ts @@ -0,0 +1,16 @@ +import { BigNumber } from '@0x/utils'; +import { ValueTransformer } from 'typeorm/decorator/options/ValueTransformer'; + +export class BigNumberTransformer implements ValueTransformer { + // tslint:disable-next-line:prefer-function-over-method + public to(value: BigNumber): string { + return value.toString(); + } + + // tslint:disable-next-line:prefer-function-over-method + public from(value: string): BigNumber { + return new BigNumber(value); + } +} + +export const bigNumberTransformer = new BigNumberTransformer(); diff --git a/packages/pipeline/src/utils/transformers/index.ts b/packages/pipeline/src/utils/transformers/index.ts new file mode 100644 index 000000000..232c1c5de --- /dev/null +++ b/packages/pipeline/src/utils/transformers/index.ts @@ -0,0 +1,2 @@ +export * from './big_number'; +export * from './number_to_bigint'; diff --git a/packages/pipeline/src/utils/transformers/number_to_bigint.ts b/packages/pipeline/src/utils/transformers/number_to_bigint.ts new file mode 100644 index 000000000..85560c1f0 --- /dev/null +++ b/packages/pipeline/src/utils/transformers/number_to_bigint.ts @@ -0,0 +1,27 @@ +import { BigNumber } from '@0x/utils'; +import { ValueTransformer } from 'typeorm/decorator/options/ValueTransformer'; + +const decimalRadix = 10; + +// Can be used to convert a JavaScript number type to a Postgres bigint type and +// vice versa. By default TypeORM will silently convert number types to string +// if the corresponding Postgres type is bigint. See +// https://github.com/typeorm/typeorm/issues/2400 for more information. +export class NumberToBigIntTransformer implements ValueTransformer { + // tslint:disable-next-line:prefer-function-over-method + public to(value: number): string { + return value.toString(); + } + + // tslint:disable-next-line:prefer-function-over-method + public from(value: string): number { + if (new BigNumber(value).greaterThan(Number.MAX_SAFE_INTEGER)) { + throw new Error( + `Attempted to convert PostgreSQL bigint value (${value}) to JavaScript number type but it is too big to safely convert`, + ); + } + return Number.parseInt(value, decimalRadix); + } +} + +export const numberToBigIntTransformer = new NumberToBigIntTransformer(); |