McMsgRef McReplyBase::releasedMsg(mc_op_t op) const {
if (msg_.get() != nullptr &&
msg_->op == op &&
msg_->result == result_ &&
msg_->flags == flags_ &&
msg_->lease_id == leaseToken_ &&
msg_->delta == delta_ &&
msg_->err_code == errCode_ &&
hasSameMemoryRegion(value(), to<folly::StringPiece>(msg_->value))) {
return msg_.clone();
} else {
auto len = value().computeChainDataLength();
auto toRelease = createMcMsgRef(len + 1);
if (msg_.get() != nullptr) {
mc_msg_shallow_copy(toRelease.get(), msg_.get());
// TODO: fbtrace?
}
toRelease->key.str = nullptr;
toRelease->key.len = 0;
toRelease->value.str =
static_cast<char*>(static_cast<void*>(toRelease.get() + 1));
copyInto(toRelease->value.str, value());
toRelease->value.len = len;
toRelease->op = op;
toRelease->result = result_;
toRelease->flags = flags_;
toRelease->lease_id = leaseToken_;
toRelease->delta = delta_;
toRelease->cas = cas_;
toRelease->err_code = errCode_;
return std::move(toRelease);
}
}
void McRequest::dependentHelper(mc_op_t op, folly::StringPiece key,
folly::StringPiece value,
MutableMcMsgRef& into) const {
if (msg_.get()) {
mc_msg_shallow_copy(into.get(), msg_.get());
}
into->op = op;
into->exptime = exptime_;
into->flags = flags_;
into->delta = delta_;
into->lease_id = leaseToken_;
into->cas = cas_;
#ifndef LIBMC_FBTRACE_DISABLE
into->fbtrace_info = fbtraceInfo_.clone().release();
#endif
into->key = to<nstring_t>(key);
into->value = to<nstring_t>(value);
}
void McReplyBase::dependentMsg(mc_op_t op, mc_msg_t* out) const {
if (msg_.get() != nullptr) {
mc_msg_shallow_copy(out, msg_.get());
}
auto value = valueRangeSlow();
out->key.str = nullptr;
out->key.len = 0;
out->value.str = const_cast<char*>(value.begin());
out->value.len = value.size();
out->op = op;
out->result = result_;
out->flags = flags_;
out->lease_id = leaseToken_;
out->delta = delta_;
out->cas = cas_;
}
mc_msg_t* mc_msg_dup_append_key_full(const mc_msg_t *msg,
const char* key_append,
size_t nkey_append) {
FBI_ASSERT(msg);
FBI_ASSERT(msg->_refcount > 0 || msg->_refcount == MSG_NOT_REFCOUNTED);
FBI_ASSERT(key_append);
// Stats are not supported.
if (msg->stats) {
return NULL;
}
if (!nkey_append) {
return mc_msg_dup(msg);
}
size_t new_extra_size = msg->_extra_size + nkey_append;
if (!_in_msg(msg, msg->key.str, msg->key.len)) {
new_extra_size += msg->key.len + 1; // +1 for null terminator
}
mc_msg_t* const msg_copy = mc_msg_new(new_extra_size);
if (msg_copy == NULL) {
return NULL;
}
mc_msg_shallow_copy(msg_copy, msg);
// The new message's key is always embedded.
msg_copy->key.len = msg->key.len + nkey_append;
msg_copy->key.str = (void*) msg_copy + sizeof(*msg_copy);
memcpy(msg_copy->key.str, msg->key.str, msg->key.len);
memcpy(msg_copy->key.str + msg->key.len, key_append, nkey_append);
msg_copy->key.str[msg_copy->key.len] = 0;
if (_in_msg(msg, msg->value.str, msg->value.len)) {
// The value starts after the key, including the null terminator.
msg_copy->value.str = msg_copy->key.str + msg_copy->key.len + 1;
memcpy(msg_copy->value.str, msg->value.str, msg_copy->value.len);
}
return msg_copy;
}