McRequest umbrellaParseRequest(const folly::IOBuf& source,
const uint8_t* header, size_t nheader,
const uint8_t* body, size_t nbody,
mc_op_t& opOut, uint64_t& reqidOut) {
McRequest req;
opOut = mc_op_unknown;
reqidOut = 0;
auto msg = reinterpret_cast<const entry_list_msg_t*>(header);
size_t nentries = folly::Endian::big((uint16_t)msg->nentries);
if (reinterpret_cast<const uint8_t*>(&msg->entries[nentries])
!= header + nheader) {
throw std::runtime_error("Invalid number of entries");
}
for (size_t i = 0; i < nentries; ++i) {
auto& entry = msg->entries[i];
size_t tag = folly::Endian::big((uint16_t)entry.tag);
size_t val = folly::Endian::big((uint64_t)entry.data.val);
switch (tag) {
case msg_op:
if (val >= UM_NOPS) {
throw std::runtime_error("op out of range");
}
opOut = static_cast<mc_op_t>(umbrella_op_to_mc[val]);
break;
case msg_reqid:
if (val == 0) {
throw std::runtime_error("invalid reqid");
}
reqidOut = val;
break;
case msg_flags:
req.setFlags(val);
break;
case msg_exptime:
req.setExptime(val);
break;
case msg_delta:
req.setDelta(val);
break;
case msg_cas:
req.setCas(val);
break;
case msg_lease_id:
req.setLeaseToken(val);
break;
case msg_key:
if (!req.setKeyFrom(
source, body +
folly::Endian::big((uint32_t)entry.data.str.offset),
folly::Endian::big((uint32_t)entry.data.str.len) - 1)) {
throw std::runtime_error("Key: invalid offset/length");
}
break;
case msg_value:
if (!req.setValueFrom(
source, body +
folly::Endian::big((uint32_t)entry.data.str.offset),
folly::Endian::big((uint32_t)entry.data.str.len) - 1)) {
throw std::runtime_error("Value: invalid offset/length");
}
break;
#ifndef LIBMC_FBTRACE_DISABLE
case msg_fbtrace:
{
auto off = folly::Endian::big((uint32_t)entry.data.str.offset);
auto len = folly::Endian::big((uint32_t)entry.data.str.len) - 1;
if (len > FBTRACE_METADATA_SZ) {
throw std::runtime_error("Fbtrace metadata too large");
}
if (off + len > nbody || off + len < off) {
throw std::runtime_error("Fbtrace metadata field invalid");
}
auto fbtraceInfo = new_mc_fbtrace_info(0);
memcpy(fbtraceInfo->metadata, body + off, len);
req.setFbtraceInfo(fbtraceInfo);
break;
}
#endif
default:
/* Ignore unknown tags silently */
break;
}
}
if (opOut == mc_op_unknown) {
throw std::runtime_error("Request missing operation");
}
if (!reqidOut) {
throw std::runtime_error("Request missing reqid");
}
return req;
}
