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| import { head } from "fp-ts/lib/Array";
import { either, fromPredicate, right } from "fp-ts/lib/Either";
import { constant, identity, or, Predicate } from "fp-ts/lib/function";
import { NonEmptyArray } from "fp-ts/lib/NonEmptyArray";
import { Option, option } from "fp-ts/lib/Option";
import { ask, fromTaskEither, ReaderTaskEither } from "fp-ts/lib/ReaderTaskEither";
import { fromEither } from "fp-ts/lib/TaskEither";
import { sequence } from "fp-ts/lib/Traversable";
import * as t from "io-ts";
import { QueryConfig } from "pg";
import {
makeRowValidationError,
PgDriverQueryError,
PgRowCountError,
PgRowValidationError,
} from "./errors";
import {
ConnectedEnvironment,
Connection,
connectionLens,
QueryResult,
RowTransformer,
} from "./types";
import { defaultCamelCaser } from "./utils/camelify";
const executeQuery = (query: QueryConfig, context: t.mixed) => (connection: Connection) =>
connection.query(query, context);
const isNoneResult: Predicate<QueryResult> = ({ rows }) => rows.length === 0;
const isNonEmptyResult: Predicate<QueryResult> = ({ rows }) => rows.length > 0;
const isOneResult: Predicate<QueryResult> = ({ rows }) => rows.length === 1;
const isOneOrNoneResult: Predicate<QueryResult> = or(isNoneResult, isOneResult);
const expectedAtLeastOneErrorFailure = (query: QueryConfig, context: t.mixed) =>
new PgRowCountError(query, ">= 1", "0", context);
const expectedNoneFoundSomeErrorFailure = (query: QueryConfig, context: t.mixed) =>
new PgRowCountError(query, "0", ">= 1", context);
const expectedOneFoundManyErrorFailure = (query: QueryConfig, context: t.mixed) =>
new PgRowCountError(query, "1", "> 1", context);
const expectedOneFoundNoneErrorFailure = (query: QueryConfig, context: t.mixed) =>
new PgRowCountError(query, "1", "0", context);
const expectedOneOrNoneErrorFailure = (query: QueryConfig, context: t.mixed) =>
new PgRowCountError(query, "0 or 1", "> 1", context);
export type QueryAnyError = PgDriverQueryError | PgRowValidationError;
export type QueryNoneError = PgDriverQueryError | PgRowCountError;
export type QueryOneError = PgDriverQueryError | PgRowValidationError | PgRowCountError;
export type QueryOneOrMoreError = PgDriverQueryError | PgRowValidationError | PgRowCountError;
export type QueryOneOrNoneError = PgDriverQueryError | PgRowValidationError | PgRowCountError;
const sequenceEO = sequence(either, option);
const queryAny = (transformer: RowTransformer = identity) => <A = any>(
type: t.Type<A, any, t.mixed>,
query: QueryConfig,
context?: t.mixed,
): ReaderTaskEither<ConnectedEnvironment, QueryAnyError, A[]> =>
ask<ConnectedEnvironment, QueryAnyError>().chain(environment => {
const connection = connectionLens.get(environment);
const queryResultTE = executeQuery(query, context)(connection).mapLeft<QueryAnyError>(identity);
const decodedQueryResultTE = queryResultTE.chain(({ rows }) => {
const transformedRows = transformer(rows);
return fromEither(
t
.array(type)
.decode(transformedRows)
.mapLeft(makeRowValidationError(type, transformedRows, context)),
);
});
return fromTaskEither(decodedQueryResultTE);
});
const queryNone = (
query: QueryConfig,
context?: t.mixed,
): ReaderTaskEither<ConnectedEnvironment, QueryNoneError, void> =>
ask<ConnectedEnvironment, QueryNoneError>().chain(environment => {
const connection = connectionLens.get(environment);
const queryResultTE = executeQuery(query, context)(connection).mapLeft<QueryNoneError>(
identity,
);
const decodedQueryResultTE = queryResultTE.chain(result =>
fromEither(
fromPredicate(isNoneResult, constant(expectedNoneFoundSomeErrorFailure(query, context)))(
result,
).map<void>(() => void 0),
),
);
return fromTaskEither(decodedQueryResultTE);
});
const queryOne = (transformer: RowTransformer = identity) => <A = any>(
type: t.Type<A, any, t.mixed>,
query: QueryConfig,
context?: t.mixed,
): ReaderTaskEither<ConnectedEnvironment, QueryOneError, A> =>
ask<ConnectedEnvironment, QueryOneError>().chain(environment => {
const connection = connectionLens.get(environment);
const queryResultTE = executeQuery(query, context)(connection).mapLeft<QueryOneError>(identity);
const decodedQueryResultTE = queryResultTE.chain(result =>
fromEither(
fromPredicate(isOneResult, r =>
fromPredicate(isNoneResult, identity)(r).fold(
constant(expectedOneFoundManyErrorFailure(query, context)),
constant(expectedOneFoundNoneErrorFailure(query, context)),
),
)(result)
.map(({ rows }) => transformer(rows)[0])
.mapLeft<QueryOneError>(identity)
.chain(row => type.decode(row).mapLeft(makeRowValidationError(type, row, context))),
),
);
return fromTaskEither(decodedQueryResultTE);
});
const queryOneOrMore = (transformer: RowTransformer = identity) => <A = any>(
type: t.Type<A, any, t.mixed>,
query: QueryConfig,
context?: t.mixed,
): ReaderTaskEither<ConnectedEnvironment, QueryOneOrMoreError, NonEmptyArray<A>> =>
ask<ConnectedEnvironment, QueryOneOrMoreError>().chain(environment => {
const connection = connectionLens.get(environment);
const queryResultTE = executeQuery(query, context)(connection).mapLeft<QueryOneOrMoreError>(
identity,
);
const decodedQueryResultTE = queryResultTE.chain(result =>
fromEither(
fromPredicate(isNonEmptyResult, constant(expectedAtLeastOneErrorFailure(query, context)))(
result,
)
.map(({ rows }) => transformer(rows))
.mapLeft<QueryOneOrMoreError>(identity)
.chain(rows =>
t
.array(type)
.decode(rows)
.mapLeft(makeRowValidationError(type, rows, context)),
)
.map(rows => new NonEmptyArray(rows[0], rows.slice(1))),
),
);
return fromTaskEither(decodedQueryResultTE);
});
const queryOneOrNone = (transformer: RowTransformer = identity) => <A = any>(
type: t.Type<A, any, t.mixed>,
query: QueryConfig,
context?: t.mixed,
): ReaderTaskEither<ConnectedEnvironment, QueryOneOrNoneError, Option<A>> =>
ask<ConnectedEnvironment, QueryOneOrNoneError>().chain(environment => {
const connection = connectionLens.get(environment);
const queryResultTE = executeQuery(query, context)(connection).mapLeft<QueryOneOrNoneError>(
identity,
);
const decodedQueryResultTE = queryResultTE.chain(result =>
fromEither(
fromPredicate(isOneOrNoneResult, constant(expectedOneOrNoneErrorFailure(query, context)))(
result,
)
.mapLeft<QueryOneOrNoneError>(identity)
.map(({ rows }) => transformer(rows))
.chain(rows =>
right<t.Errors, Option<t.mixed>>(head(rows))
.chain(rowO => sequenceEO(rowO.map(row => type.decode(row))))
.mapLeft(makeRowValidationError(type, rows, context)),
),
),
);
return fromTaskEither(decodedQueryResultTE);
});
export const configurableQueries = {
queryAny,
queryNone,
queryOne,
queryOneOrMore,
queryOneOrNone,
};
export const camelCasedQueries = {
queryAny: queryAny(defaultCamelCaser),
queryNone,
queryOne: queryOne(defaultCamelCaser),
queryOneOrMore: queryOneOrMore(defaultCamelCaser),
queryOneOrNone: queryOneOrNone(defaultCamelCaser),
};
|