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runner.js
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runner.js
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var Promise = require('./promise')
import {assign, isArray} from 'lodash'
var PassThrough;
// The "Runner" constructor takes a "builder" (query, schema, or raw)
// and runs through each of the query statements, calling any additional
// "output" method provided alongside the query and bindings.
function Runner(client, builder) {
this.client = client
this.builder = builder
this.queries = []
// The "connection" object is set on the runner when
// "run" is called.
this.connection = void 0
}
assign(Runner.prototype, {
// "Run" the target, calling "toSQL" on the builder, returning
// an object or array of queries to run, each of which are run on
// a single connection.
run: function() {
var runner = this
return Promise.using(this.ensureConnection(), function(connection) {
runner.connection = connection;
runner.client.emit('start', runner.builder)
runner.builder.emit('start', runner.builder)
var sql = runner.builder.toSQL();
if (runner.builder._debug) {
console.log(sql)
}
if (isArray(sql)) {
return runner.queryArray(sql);
}
return runner.query(sql);
})
// If there are any "error" listeners, we fire an error event
// and then re-throw the error to be eventually handled by
// the promise chain. Useful if you're wrapping in a custom `Promise`.
.catch(function(err) {
if (runner.builder._events && runner.builder._events.error) {
runner.builder.emit('error', err);
}
throw err;
})
// Fire a single "end" event on the builder when
// all queries have successfully completed.
.tap(function() {
runner.builder.emit('end');
})
},
// Stream the result set, by passing through to the dialect's streaming
// capabilities. If the options are
stream: function(options, handler) {
// If we specify stream(handler).then(...
if (arguments.length === 1) {
if (typeof options === 'function') {
handler = options;
options = {};
}
}
// Determines whether we emit an error or throw here.
var hasHandler = typeof handler === 'function';
// Lazy-load the "PassThrough" dependency.
PassThrough = PassThrough || require('readable-stream').PassThrough;
var runner = this;
var stream = new PassThrough({objectMode: true});
var promise = Promise.using(this.ensureConnection(), function(connection) {
runner.connection = connection;
var sql = runner.builder.toSQL()
var err = new Error('The stream may only be used with a single query statement.');
if (isArray(sql)) {
if (hasHandler) throw err;
stream.emit('error', err);
}
return runner.client.stream(runner.connection, sql, stream, options);
})
// If a function is passed to handle the stream, send the stream
// there and return the promise, otherwise just return the stream
// and the promise will take care of itsself.
if (hasHandler) {
handler(stream);
return promise;
}
return stream;
},
// Allow you to pipe the stream to a writable stream.
pipe: function(writable, options) {
return this.stream(options).pipe(writable);
},
// "Runs" a query, returning a promise. All queries specified by the builder are guaranteed
// to run in sequence, and on the same connection, especially helpful when schema building
// and dealing with foreign key constraints, etc.
query: Promise.method(function(obj) {
this.builder.emit('query', assign({__knexUid: this.connection.__knexUid}, obj))
var runner = this
var queryPromise = this.client.query(this.connection, obj)
if(obj.timeout) {
queryPromise = queryPromise.timeout(obj.timeout)
}
return queryPromise
.then((resp) => {
var processedResponse = this.client.processResponse(resp, runner);
this.builder.emit('query-response', processedResponse, assign({__knexUid: this.connection.__knexUid}, obj), this.builder)
this.client.emit('query-response', processedResponse, assign({__knexUid: this.connection.__knexUid}, obj), this.builder)
return processedResponse;
}).catch(Promise.TimeoutError, error => {
throw assign(error, {
message: `Defined query timeout of ${obj.timeout}ms exceeded when running query.`,
sql: obj.sql,
bindings: obj.bindings,
timeout: obj.timeout
});
})
.catch((error) => {
this.builder.emit('query-error', error, assign({__knexUid: this.connection.__knexUid}, obj))
throw error;
});
}),
// In the case of the "schema builder" we call `queryArray`, which runs each
// of the queries in sequence.
queryArray: function(queries) {
return queries.length === 1 ? this.query(queries[0]) : Promise.bind(this)
.return(queries)
.reduce(function(memo, query) {
return this.query(query).then(function(resp) {
memo.push(resp)
return memo;
});
}, [])
},
// Check whether there's a transaction flag, and that it has a connection.
ensureConnection: function() {
var runner = this
var acquireConnectionTimeout = runner.client.config.acquireConnectionTimeout || 60000
return Promise.try(function() {
return runner.connection || new Promise((resolver, rejecter) => {
runner.client.acquireConnection()
.timeout(acquireConnectionTimeout)
.then(resolver)
.catch(Promise.TimeoutError, (error) => {
var timeoutError = new Error('Knex: Timeout acquiring a connection. The pool is probably full. Are you missing a .transacting(trx) call?')
var additionalErrorInformation = {
timeoutStack: error.stack
}
if(runner.builder) {
additionalErrorInformation.sql = runner.builder.sql
additionalErrorInformation.bindings = runner.builder.bindings
}
assign(timeoutError, additionalErrorInformation)
rejecter(timeoutError)
})
.catch(rejecter)
})
}).disposer(function() {
if (runner.connection.__knex__disposed) return
runner.client.releaseConnection(runner.connection)
})
}
})
module.exports = Runner;