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transaction hook #340

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72 changes: 72 additions & 0 deletions hooks/sequelize-transaction-hook.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,72 @@
const debug = require("debug")("feathers-sequelize-transaction");

/* eslint-disable require-atomic-updates */
const start = (options = {}) => {
return async hook => {
if (
hook.params.transaction ||
(hook.params.sequelize && options.params.sequelize.transaction)
) {
// already in transaction probably in diffrent hook or service
// so we dont create or commit the transaction in this service
return hook;
}

const sequelize = hook.app.get("sequelizeClient");
const transaction = await sequelize.transaction();
transaction.owner = hook.path;

hook.params.transaction = transaction;
hook.params.sequelize = hook.params.sequelize || {};
hook.params.sequelize.transaction = transaction;

return hook;
};
};

const end = () => {
return async hook => {
const trx = hook.params.sequelize.transaction || hook.params.transaction;

if (!trx || !trx.owner || trx.owner !== hook.path) {
// transaction probably from diffrent hook or service
// so we dont commit or rollback the transaction in this service
return hook;
}
await trx.commit().then(() => {
delete hook.params.sequelize.transaction;
delete hook.params.transaction;
});
return hook;
};
};

const rollback = () => {
return async hook => {
const trx = hook.params.sequelize.transaction || hook.params.transaction;

if (!trx || !trx.owner || trx.owner !== hook.path) {
// transaction probably from diffrent hook or service
// so we dont commit or rollback the transaction in this service
return hook;
}

try {
await trx.rollback();
delete hook.params.sequelize.transaction;
delete hook.params.transaction;
} catch (err) {
debug(err);
}

return hook;
};
};

module.exports = {
transaction: {
start,
end,
rollback
}
};