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var assert = require('assert');
var hpack = require('../');
var fixtures = require('./fixtures');
describe('hpack/compressor', function() {
var comp;
beforeEach(function() {
comp = hpack.compressor.create({
table: {
maxSize: 1024
}
});
});
function expect(arr, enc) {
function isNumber(num) {
return typeof num === 'number';
}
var out = comp.read().toString('hex');
if (Array.isArray(arr) && !arr.every(isNumber)) {
arr = arr.map(function(item) {
return new Buffer(item, enc);
});
arr = Buffer.concat(arr);
} else {
arr = new Buffer(arr, enc);
}
var actual = arr.toString('hex');
assert.equal(out, actual);
}
describe('indexed field', function() {
it('should lookup entry from static table', function() {
comp.write([{ name: ':method', value: 'GET' }]);
expect([ 0b10000000 | 2 ]);
});
it('should fetch entry from the end of the static table', function() {
comp.write([{ name: 'www-authenticate', value: '' }]);
expect([ 0b10000000 | 61 ]);
});
});
describe('literal field', function() {
it('should lookup name in the table (incremental)', function() {
comp.write([{ name: 'host', value: 'localhost' }]);
expect('6686a0e41d139d09', 'hex');
comp.write([{ name: 'host', value: 'localhost' }]);
expect([ 0b10000000 | 62 ]);
});
it('should lookup name in the table (not-incremental)', function() {
comp.write([{ name: 'host', value: 'localhost', incremental: false }]);
expect('0f1786a0e41d139d09', 'hex');
// Should not use the table
comp.write([{ name: 'host', value: 'localhost' }]);
expect('6686a0e41d139d09', 'hex');
});
it('should evict header field from the table', function() {
for (var i = 0; i < 1000; i++) {
comp.write([{ name: 'host', value: 'localhost' + i }]);
comp.read();
}
assert(comp._table.size < comp._table.maxSize);
assert.equal(comp._table.dynamic.length, 21);
});
});
describe('update size', function() {
it('should evict header field from the table', function() {
comp.write([{ name: 'host', value: 'localhost' }]);
expect('6686a0e41d139d09', 'hex');
comp.reset();
// update=0, update=maxSize
expect('203fe107', 'hex');
comp.write([{ name: 'host', value: 'localhost' }]);
expect('6686a0e41d139d09', 'hex');
});
it('should send dynamic update if size >= protocolMaxSize', function() {
comp.updateTableSize(Infinity);
// update=maxSize
expect('3fe107', 'hex');
});
});
describe('spec examples', function() {
beforeEach(function() {
comp = hpack.compressor.create({
table: {
maxSize: 256
}
});
});
var tests = fixtures.specExamples;
tests.forEach(function(test, i) {
var prev = tests[i - 1];
it('should give expected output on ' + test.id, function() {
var startFrom = test.continuation ? prev.comp : comp;
if (!startFrom)
throw new Error('Previous test failed');
comp = startFrom;
comp.write(test.output.map(function(pair) {
return { name: pair[0], value: pair[1], huffman: test.huffman };
}));
expect(test.input.replace(/ /g, ''), 'hex');
// Verify table contents
assert.deepEqual(comp._table.dynamic.map(function(header) {
return [ header.name, header.value, header.totalSize ];
}).reverse(), test.table);
// Verify table size
var expectedSize = test.table.reduce(function(acc, item) {
return acc + item[2];
}, 0);
assert.equal(comp._table.size, expectedSize);
test.comp = comp;
});
});
});
});