memgraph/tests/unit/chunked_encoder.cpp
2016-08-01 22:14:09 +01:00

116 lines
2.2 KiB
C++

#include <iostream>
#include <deque>
#include <cassert>
#include <vector>
#include "bolt/v1/transport/chunked_encoder.hpp"
using byte = unsigned char;
void print_hex(byte x)
{
printf("%02X ", static_cast<byte>(x));
}
class DummyStream
{
public:
void write(const byte* values, size_t n)
{
num_calls++;
data.insert(data.end(), values, values + n);
}
byte pop()
{
auto c = data.front();
data.pop_front();
return c;
}
size_t pop_size()
{
return ((size_t)pop() << 8) | pop();
}
void print()
{
for(size_t i = 0; i < data.size(); ++i)
print_hex(data[i]);
}
std::deque<byte> data;
size_t num_calls {0};
};
using Encoder = bolt::ChunkedEncoder<DummyStream>;
void write_ff(Encoder& encoder, size_t n)
{
std::vector<byte> v;
for(size_t i = 0; i < n; ++i)
v.push_back('\xFF');
encoder.write(v.data(), v.size());
}
void check_ff(DummyStream& stream, size_t n)
{
for(size_t i = 0; i < n; ++i)
assert(stream.pop() == byte('\xFF'));
(void)stream;
}
int main(void)
{
DummyStream stream;
bolt::ChunkedEncoder<DummyStream> encoder(stream);
write_ff(encoder, 10);
write_ff(encoder, 10);
encoder.finish();
write_ff(encoder, 10);
write_ff(encoder, 10);
encoder.finish();
// this should be two chunks, one of size 65533 and the other of size 1467
write_ff(encoder, 67000);
encoder.finish();
for(int i = 0; i < 10000; ++i)
write_ff(encoder, 1500);
encoder.finish();
assert(stream.pop_size() == 20);
check_ff(stream, 20);
assert(stream.pop_size() == 0);
assert(stream.pop_size() == 20);
check_ff(stream, 20);
assert(stream.pop_size() == 0);
assert(stream.pop_size() == encoder.chunk_size);
check_ff(stream, encoder.chunk_size);
assert(stream.pop_size() == 1467);
check_ff(stream, 1467);
assert(stream.pop_size() == 0);
size_t k = 10000 * 1500;
while(k > 0)
{
auto size = k > encoder.chunk_size ? encoder.chunk_size : k;
assert(stream.pop_size() == size);
check_ff(stream, size);
k -= size;
}
assert(stream.pop_size() == 0);
return 0;
}