diff options
Diffstat (limited to 'src/rgw/rgw_compression.cc')
| -rw-r--r-- | src/rgw/rgw_compression.cc | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/src/rgw/rgw_compression.cc b/src/rgw/rgw_compression.cc new file mode 100644 index 00000000..b70f51ad --- /dev/null +++ b/src/rgw/rgw_compression.cc @@ -0,0 +1,201 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#include "rgw_compression.h" + +#define dout_subsys ceph_subsys_rgw + +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; + 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); + 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.claim(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); + } + } else { + compressed = false; + out.claim(in); + } + // end of compression stuff + } + return Pipe::process(std::move(out), logical_offset); +} + +//----------------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 << 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.copy(bl_ofs, 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.claim(temp_in_bl); + } + bl_len = in_bl.length(); + + 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; + in_bl.copy(ofs_in_bl, tail, waiting); + cur_ofs -= tail; + break; + } + in_bl.copy(ofs_in_bl, first_block->len, tmp); + int cr = compressor->decompress(tmp, out_bl); + if (cr < 0) { + lderr(cct) << "Decompression failed with exit code " << cr << dendl; + return cr; + } + ++first_block; + while (out_bl.length() - q_ofs >= 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) { + lderr(cct) << "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) { + lderr(cct) << "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); +} |