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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,9 +1,7 @@ | ||
| language: node_js | ||
| node_js: | ||
| - "0.10" | ||
| - "0.12" | ||
| - "4.2" | ||
| - "6" | ||
| - "7" | ||
| - "8" | ||
| env: | ||
| - PGUSER=postgres PGDATABASE=postgres |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,69 +1,63 @@ | ||
| 'use strict'; | ||
| var util = require('util') | ||
| var Cursor = require('pg-cursor') | ||
| var Readable = require('readable-stream').Readable | ||
| var Readable = require('stream').Readable | ||
|
|
||
| var QueryStream = module.exports = function(text, values, options) { | ||
| var self = this | ||
| this._reading = false | ||
| this._closing = false | ||
| options = options || { } | ||
| Cursor.call(this, text, values) | ||
| Readable.call(this, { | ||
| objectMode: true, | ||
| highWaterMark: options.highWaterMark || 1000 | ||
| }) | ||
| this.batchSize = options.batchSize || 100 | ||
| this.once('end', function() { | ||
| process.nextTick(function() { | ||
| self.emit('close') | ||
| }) | ||
| }) | ||
| } | ||
| class PgQueryStream extends Readable { | ||
| constructor(text, values, options) { | ||
| super(Object.assign({ objectMode: true }, options)) | ||
| this.cursor = new Cursor(text, values) | ||
| this._reading = false | ||
| this._closed = false | ||
| this.batchSize = (options || { }).batchSize || 100 | ||
|
|
||
| util.inherits(QueryStream, Readable) | ||
| // delegate Submittable callbacks to cursor | ||
| this.handleRowDescription = this.cursor.handleRowDescription.bind(this.cursor) | ||
| this.handleDataRow = this.cursor.handleDataRow.bind(this.cursor) | ||
| this.handlePortalSuspended = this.cursor.handlePortalSuspended.bind(this.cursor) | ||
| this.handleCommandComplete = this.cursor.handleCommandComplete.bind(this.cursor) | ||
| this.handleReadyForQuery = this.cursor.handleReadyForQuery.bind(this.cursor) | ||
| this.handleError = this.cursor.handleError.bind(this.cursor) | ||
| } | ||
|
|
||
| //copy cursor prototype to QueryStream | ||
| //so we can handle all the events emitted by the connection | ||
| for(var key in Cursor.prototype) { | ||
| if(key == 'read') { | ||
| QueryStream.prototype._fetch = Cursor.prototype.read | ||
| } else { | ||
| QueryStream.prototype[key] = Cursor.prototype[key] | ||
| submit(connection) { | ||
| this.cursor.submit(connection) | ||
| return this | ||
| } | ||
| } | ||
|
|
||
| QueryStream.prototype.close = function(cb) { | ||
| this._closing = true | ||
| var self = this | ||
| Cursor.prototype.close.call(this, function(err) { | ||
| if (cb) { cb(err); } | ||
| if(err) return self.emit('error', err) | ||
| process.nextTick(function() { | ||
| self.push(null) | ||
| }) | ||
| }) | ||
| } | ||
| close(callback) { | ||
| this._closed = true | ||
| const cb = callback || (() => this.emit('close')) | ||
| this.cursor.close(cb) | ||
| } | ||
|
|
||
| QueryStream.prototype._read = function(n) { | ||
| if(this._reading || this._closing) return false | ||
| this._reading = true | ||
| var self = this | ||
| this._fetch(this.batchSize, function(err, rows) { | ||
| if(err) { | ||
| return self.emit('error', err) | ||
| _read(size) { | ||
| if (this._reading || this._closed) { | ||
| return false | ||
| } | ||
| this._reading = true | ||
| const readAmount = Math.max(size, this.batchSize) | ||
| this.cursor.read(readAmount, (err, rows) => { | ||
| if (this._closed) { | ||
| return | ||
| } | ||
| if (err) { | ||
| return this.emit('error', err) | ||
| } | ||
| // if we get a 0 length array we've read to the end of the cursor | ||
| if (!rows.length) { | ||
| this._closed = true | ||
| setImmediate(() => this.emit('close')) | ||
| return this.push(null) | ||
| } | ||
|
|
||
| if (self._closing) { return; } | ||
|
|
||
| if(!rows.length) { | ||
| process.nextTick(function() { | ||
| self.push(null) | ||
| }) | ||
| return | ||
| } | ||
| self._reading = false | ||
| for(var i = 0; i < rows.length; i++) { | ||
| self.push(rows[i]) | ||
| } | ||
| }) | ||
| // push each row into the stream | ||
| this._reading = false | ||
| for(var i = 0; i < rows.length; i++) { | ||
| this.push(rows[i]) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| module.exports = PgQueryStream |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,2 @@ | ||
| --no-exit | ||
| --bail |
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