// Ported from https://github.com/mafintosh/end-of-stream with
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// permission from the author, Mathias Buus (@mafintosh).
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'use strict';
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var ERR_STREAM_PREMATURE_CLOSE = require('../../../errors').codes.ERR_STREAM_PREMATURE_CLOSE;
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function once(callback) {
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var called = false;
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return function () {
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if (called) return;
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called = true;
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for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
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args[_key] = arguments[_key];
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}
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callback.apply(this, args);
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};
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}
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function noop() {}
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function isRequest(stream) {
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return stream.setHeader && typeof stream.abort === 'function';
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}
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function eos(stream, opts, callback) {
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if (typeof opts === 'function') return eos(stream, null, opts);
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if (!opts) opts = {};
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callback = once(callback || noop);
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var readable = opts.readable || opts.readable !== false && stream.readable;
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var writable = opts.writable || opts.writable !== false && stream.writable;
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var onlegacyfinish = function onlegacyfinish() {
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if (!stream.writable) onfinish();
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};
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var writableEnded = stream._writableState && stream._writableState.finished;
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var onfinish = function onfinish() {
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writable = false;
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writableEnded = true;
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if (!readable) callback.call(stream);
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};
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var readableEnded = stream._readableState && stream._readableState.endEmitted;
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var onend = function onend() {
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readable = false;
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readableEnded = true;
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if (!writable) callback.call(stream);
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};
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var onerror = function onerror(err) {
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callback.call(stream, err);
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};
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var onclose = function onclose() {
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var err;
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if (readable && !readableEnded) {
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if (!stream._readableState || !stream._readableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
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return callback.call(stream, err);
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}
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if (writable && !writableEnded) {
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if (!stream._writableState || !stream._writableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
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return callback.call(stream, err);
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}
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};
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var onrequest = function onrequest() {
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stream.req.on('finish', onfinish);
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};
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if (isRequest(stream)) {
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stream.on('complete', onfinish);
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stream.on('abort', onclose);
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if (stream.req) onrequest();else stream.on('request', onrequest);
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} else if (writable && !stream._writableState) {
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// legacy streams
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stream.on('end', onlegacyfinish);
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stream.on('close', onlegacyfinish);
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}
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stream.on('end', onend);
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stream.on('finish', onfinish);
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if (opts.error !== false) stream.on('error', onerror);
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stream.on('close', onclose);
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return function () {
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stream.removeListener('complete', onfinish);
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stream.removeListener('abort', onclose);
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stream.removeListener('request', onrequest);
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if (stream.req) stream.req.removeListener('finish', onfinish);
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stream.removeListener('end', onlegacyfinish);
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stream.removeListener('close', onlegacyfinish);
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stream.removeListener('finish', onfinish);
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stream.removeListener('end', onend);
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stream.removeListener('error', onerror);
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stream.removeListener('close', onclose);
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};
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}
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module.exports = eos;
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