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construct/matrix/txn.cc
2022-07-07 16:47:55 -07:00

139 lines
3.1 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
/// Returns the serial size of the JSON this txn would consume. Note: this
/// creates a json::iov involving a timestamp to figure out the total size
/// of the txn. When the user creates the actual txn a different timestamp
/// is created which may be a different size. Consider using the lower-level
/// create(closure) or add some pad to be sure.
///
size_t
ircd::m::txn::serialized(const array &pdu,
const array &edu,
const array &pdu_failure)
{
size_t ret;
const auto closure{[&ret]
(const json::iov &iov)
{
ret = json::serialized(iov);
}};
create(closure, pdu, edu, pdu_failure);
return ret;
}
/// Stringifies a txn from the inputs into the returned std::string
///
std::string
ircd::m::txn::create(const array &pdu,
const array &edu,
const array &pdu_failure)
{
std::string ret;
const auto closure{[&ret]
(const json::iov &iov)
{
ret = json::strung(iov);
}};
create(closure, pdu, edu, pdu_failure);
return ret;
}
/// Stringifies a txn from the inputs into the buffer
///
ircd::string_view
ircd::m::txn::create(const mutable_buffer &buf,
const array &pdu,
const array &edu,
const array &pdu_failure)
{
string_view ret;
const auto closure{[&buf, &ret]
(const json::iov &iov)
{
ret = json::stringify(mutable_buffer{buf}, iov);
}};
create(closure, pdu, edu, pdu_failure);
return ret;
}
/// Forms a txn from the inputs into a json::iov and presents that iov
/// to the user's closure.
///
void
ircd::m::txn::create(const closure &closure,
const array &pdu,
const array &edu,
const array &pdu_failure)
{
using ircd::size;
json::iov iov;
const json::iov::push push[]
{
{ iov, { "origin", my_host() }},
{ iov, { "origin_server_ts", ircd::time<milliseconds>() }},
};
const json::iov::add _pdus
{
iov, !empty(pdu),
{
"pdus", [&pdu]() noexcept -> json::value
{
return { data(pdu), size(pdu) };
}
}
};
const json::iov::add _edus
{
iov, !empty(edu),
{
"edus", [&edu]() noexcept -> json::value
{
return { data(edu), size(edu) };
}
}
};
const json::iov::add _pdu_failures
{
iov, !empty(pdu_failure),
{
"pdu_failures", [&pdu_failure]() noexcept -> json::value
{
return { data(pdu_failure), size(pdu_failure) };
}
}
};
closure(iov);
}
ircd::string_view
ircd::m::txn::create_id(const mutable_buffer &out,
const string_view &txn)
{
const sha256::buf hash
{
sha256{txn}
};
const string_view txnid
{
b58::encode(out, hash)
};
return txnid;
}