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var common = require('../common');
var assert = require('assert');
// This test verifies that:
// 1. unshift() does not cause colliding _read() calls.
// 2. unshift() after the 'end' event is an error, but after the EOF
// signalling null, it is ok, and just creates a new readable chunk.
// 3. push() after the EOF signaling null is an error.
// 4. _read() is not called after pushing the EOF null chunk.
var stream = require('stream');
var hwm = 10;
var r = stream.Readable({ highWaterMark: hwm });
var chunks = 10;
var t = (chunks * 5);
var data = new Buffer(chunks * hwm + Math.ceil(hwm / 2));
for (var i = 0; i < data.length; i++) {
var c = 'asdf'.charCodeAt(i % 4);
data[i] = c;
}
var pos = 0;
var pushedNull = false;
r._read = function(n) {
assert(!pushedNull, '_read after null push');
// every third chunk is fast
push(!(chunks % 3));
function push(fast) {
assert(!pushedNull, 'push() after null push');
var c = pos >= data.length ? null : data.slice(pos, pos + n);
pushedNull = c === null;
if (fast) {
pos += n;
r.push(c);
if (c === null) pushError();
} else {
setTimeout(function() {
pos += n;
r.push(c);
if (c === null) pushError();
});
}
}
};
function pushError() {
assert.throws(function() {
r.push(new Buffer(1));
});
}
var w = stream.Writable();
var written = [];
w._write = function(chunk, encoding, cb) {
written.push(chunk.toString());
cb();
};
var ended = false;
r.on('end', function() {
assert(!ended, 'end emitted more than once');
assert.throws(function() {
r.unshift(new Buffer(1));
});
ended = true;
w.end();
});
r.on('readable', function() {
var chunk;
while (null !== (chunk = r.read(10))) {
w.write(chunk);
if (chunk.length > 4)
r.unshift(new Buffer('1234'));
}
});
var finished = false;
w.on('finish', function() {
finished = true;
// each chunk should start with 1234, and then be asfdasdfasdf...
// The first got pulled out before the first unshift('1234'), so it's
// lacking that piece.
assert.equal(written[0], 'asdfasdfas');
var asdf = 'd';
console.error('0: %s', written[0]);
for (var i = 1; i < written.length; i++) {
console.error('%s: %s', i.toString(32), written[i]);
assert.equal(written[i].slice(0, 4), '1234');
for (var j = 4; j < written[i].length; j++) {
var c = written[i].charAt(j);
assert.equal(c, asdf);
switch (asdf) {
case 'a': asdf = 's'; break;
case 's': asdf = 'd'; break;
case 'd': asdf = 'f'; break;
case 'f': asdf = 'a'; break;
}
}
}
});
process.on('exit', function() {
assert.equal(written.length, 18);
assert(ended, 'stream ended');
assert(finished, 'stream finished');
console.log('ok');
});