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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
#include "rgw_compression.h"
#define dout_subsys ceph_subsys_rgw
using namespace std;
int rgw_compression_info_from_attr(const bufferlist& attr,
bool& need_decompress,
RGWCompressionInfo& cs_info)
{
auto bliter = attr.cbegin();
try {
decode(cs_info, bliter);
} catch (buffer::error& err) {
return -EIO;
}
if (cs_info.blocks.size() == 0) {
return -EIO;
}
if (cs_info.compression_type != "none")
need_decompress = true;
else
need_decompress = false;
return 0;
}
int rgw_compression_info_from_attrset(const map<string, bufferlist>& attrs,
bool& need_decompress,
RGWCompressionInfo& cs_info)
{
auto value = attrs.find(RGW_ATTR_COMPRESSION);
if (value == attrs.end()) {
need_decompress = false;
return 0;
}
return rgw_compression_info_from_attr(value->second, need_decompress, cs_info);
}
//------------RGWPutObj_Compress---------------
int RGWPutObj_Compress::process(bufferlist&& in, uint64_t logical_offset)
{
bufferlist out;
compressed_ofs = logical_offset;
if (in.length() > 0) {
// compression stuff
if ((logical_offset > 0 && compressed) || // if previous part was compressed
(logical_offset == 0)) { // or it's the first part
ldout(cct, 10) << "Compression for rgw is enabled, compress part " << in.length() << dendl;
int cr = compressor->compress(in, out, compressor_message);
if (cr < 0) {
if (logical_offset > 0) {
lderr(cct) << "Compression failed with exit code " << cr
<< " for next part, compression process failed" << dendl;
return -EIO;
}
compressed = false;
ldout(cct, 5) << "Compression failed with exit code " << cr
<< " for first part, storing uncompressed" << dendl;
out = std::move(in);
} else {
compressed = true;
compression_block newbl;
size_t bs = blocks.size();
newbl.old_ofs = logical_offset;
newbl.new_ofs = bs > 0 ? blocks[bs-1].len + blocks[bs-1].new_ofs : 0;
newbl.len = out.length();
blocks.push_back(newbl);
compressed_ofs = newbl.new_ofs;
}
} else {
compressed = false;
out = std::move(in);
}
// end of compression stuff
} else {
size_t bs = blocks.size();
compressed_ofs = bs > 0 ? blocks[bs-1].len + blocks[bs-1].new_ofs : logical_offset;
}
return Pipe::process(std::move(out), compressed_ofs);
}
//----------------RGWGetObj_Decompress---------------------
RGWGetObj_Decompress::RGWGetObj_Decompress(CephContext* cct_,
RGWCompressionInfo* cs_info_,
bool partial_content_,
RGWGetObj_Filter* next): RGWGetObj_Filter(next),
cct(cct_),
cs_info(cs_info_),
partial_content(partial_content_),
q_ofs(0),
q_len(0),
cur_ofs(0)
{
compressor = Compressor::create(cct, cs_info->compression_type);
if (!compressor.get())
lderr(cct) << "Cannot load compressor of type " << cs_info->compression_type << dendl;
}
int RGWGetObj_Decompress::handle_data(bufferlist& bl, off_t bl_ofs, off_t bl_len)
{
ldout(cct, 10) << "Compression for rgw is enabled, decompress part "
<< "bl_ofs=" << bl_ofs << ", bl_len=" << bl_len << dendl;
if (!compressor.get()) {
// if compressor isn't available - error, because cannot return decompressed data?
lderr(cct) << "Cannot load compressor of type " << cs_info->compression_type << dendl;
return -EIO;
}
bufferlist out_bl, in_bl, temp_in_bl;
bl.begin(bl_ofs).copy(bl_len, temp_in_bl);
bl_ofs = 0;
int r = 0;
if (waiting.length() != 0) {
in_bl.append(waiting);
in_bl.append(temp_in_bl);
waiting.clear();
} else {
in_bl = std::move(temp_in_bl);
}
bl_len = in_bl.length();
auto iter_in_bl = in_bl.cbegin();
while (first_block <= last_block) {
bufferlist tmp;
off_t ofs_in_bl = first_block->new_ofs - cur_ofs;
if (ofs_in_bl + (off_t)first_block->len > bl_len) {
// not complete block, put it to waiting
unsigned tail = bl_len - ofs_in_bl;
if (iter_in_bl.get_off() != ofs_in_bl) {
iter_in_bl.seek(ofs_in_bl);
}
iter_in_bl.copy(tail, waiting);
cur_ofs -= tail;
break;
}
if (iter_in_bl.get_off() != ofs_in_bl) {
iter_in_bl.seek(ofs_in_bl);
}
iter_in_bl.copy(first_block->len, tmp);
int cr = compressor->decompress(tmp, out_bl, cs_info->compressor_message);
if (cr < 0) {
lderr(cct) << "Decompression failed with exit code " << cr << dendl;
return cr;
}
++first_block;
while (out_bl.length() - q_ofs >=
static_cast<off_t>(cct->_conf->rgw_max_chunk_size)) {
off_t ch_len = std::min<off_t>(cct->_conf->rgw_max_chunk_size, q_len);
q_len -= ch_len;
r = next->handle_data(out_bl, q_ofs, ch_len);
if (r < 0) {
lsubdout(cct, rgw, 0) << "handle_data failed with exit code " << r << dendl;
return r;
}
out_bl.splice(0, q_ofs + ch_len);
q_ofs = 0;
}
}
cur_ofs += bl_len;
off_t ch_len = std::min<off_t>(out_bl.length() - q_ofs, q_len);
if (ch_len > 0) {
r = next->handle_data(out_bl, q_ofs, ch_len);
if (r < 0) {
lsubdout(cct, rgw, 0) << "handle_data failed with exit code " << r << dendl;
return r;
}
out_bl.splice(0, q_ofs + ch_len);
q_len -= ch_len;
q_ofs = 0;
}
return r;
}
int RGWGetObj_Decompress::fixup_range(off_t& ofs, off_t& end)
{
if (partial_content) {
// if user set range, we need to calculate it in decompressed data
first_block = cs_info->blocks.begin(); last_block = cs_info->blocks.begin();
if (cs_info->blocks.size() > 1) {
vector<compression_block>::iterator fb, lb;
// not bad to use auto for lambda, I think
auto cmp_u = [] (off_t ofs, const compression_block& e) { return (uint64_t)ofs < e.old_ofs; };
auto cmp_l = [] (const compression_block& e, off_t ofs) { return e.old_ofs <= (uint64_t)ofs; };
fb = upper_bound(cs_info->blocks.begin()+1,
cs_info->blocks.end(),
ofs,
cmp_u);
first_block = fb - 1;
lb = lower_bound(fb,
cs_info->blocks.end(),
end,
cmp_l);
last_block = lb - 1;
}
} else {
first_block = cs_info->blocks.begin(); last_block = cs_info->blocks.end() - 1;
}
q_ofs = ofs - first_block->old_ofs;
q_len = end + 1 - ofs;
ofs = first_block->new_ofs;
end = last_block->new_ofs + last_block->len - 1;
cur_ofs = ofs;
waiting.clear();
return next->fixup_range(ofs, end);
}
void compression_block::dump(Formatter *f) const
{
f->dump_unsigned("old_ofs", old_ofs);
f->dump_unsigned("new_ofs", new_ofs);
f->dump_unsigned("len", len);
}
void RGWCompressionInfo::dump(Formatter *f) const
{
f->dump_string("compression_type", compression_type);
f->dump_unsigned("orig_size", orig_size);
if (compressor_message) {
f->dump_int("compressor_message", *compressor_message);
}
::encode_json("blocks", blocks, f);
}
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