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construct/matrix/event_get.cc

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2019-09-27 03:36:03 +02:00
// 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.
///////////////////////////////////////////////////////////////////////////////
//
// event/get.h
//
std::string
ircd::m::get(const event::id &event_id,
const string_view &key)
{
std::string ret;
get(event_id, key, [&ret]
(const string_view &value)
{
ret = value;
});
return ret;
}
std::string
ircd::m::get(const event::idx &event_idx,
const string_view &key)
{
std::string ret;
get(event_idx, key, [&ret]
(const string_view &value)
{
ret = value;
});
return ret;
}
std::string
ircd::m::get(std::nothrow_t,
const event::id &event_id,
const string_view &key)
{
std::string ret;
get(std::nothrow, event_id, key, [&ret]
(const string_view &value)
{
ret = value;
});
return ret;
}
std::string
ircd::m::get(std::nothrow_t,
const event::idx &event_idx,
const string_view &key)
{
std::string ret;
get(std::nothrow, event_idx, key, [&ret]
(const string_view &value)
{
ret = value;
});
return ret;
}
ircd::const_buffer
ircd::m::get(const event::id &event_id,
const string_view &key,
const mutable_buffer &out)
{
const auto &ret
{
get(std::nothrow, index(event_id), key, out)
};
if(!ret)
throw m::NOT_FOUND
{
"%s for %s not found in database",
key,
string_view{event_id}
};
return ret;
}
ircd::const_buffer
ircd::m::get(const event::idx &event_idx,
const string_view &key,
const mutable_buffer &out)
{
const const_buffer ret
{
get(std::nothrow, event_idx, key, out)
};
if(!ret)
throw m::NOT_FOUND
{
"%s for event_idx[%lu] not found in database",
key,
event_idx
};
return ret;
}
ircd::const_buffer
ircd::m::get(std::nothrow_t,
const event::id &event_id,
const string_view &key,
const mutable_buffer &buf)
{
return get(std::nothrow, index(std::nothrow, event_id), key, buf);
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}
ircd::const_buffer
ircd::m::get(std::nothrow_t,
const event::idx &event_idx,
const string_view &key,
const mutable_buffer &buf)
{
const_buffer ret;
get(std::nothrow, event_idx, key, [&buf, &ret]
(const string_view &value)
{
ret = { data(buf), copy(buf, value) };
});
return ret;
}
void
ircd::m::get(const event::id &event_id,
const string_view &key,
const event::fetch::view_closure &closure)
{
if(!get(std::nothrow, index(event_id), key, closure))
throw m::NOT_FOUND
{
"%s for %s not found in database",
key,
string_view{event_id}
};
}
void
ircd::m::get(const event::idx &event_idx,
const string_view &key,
const event::fetch::view_closure &closure)
{
if(!get(std::nothrow, event_idx, key, closure))
throw m::NOT_FOUND
{
"%s for event_idx[%lu] not found in database",
key,
event_idx
};
}
bool
ircd::m::get(std::nothrow_t,
const event::id &event_id,
const string_view &key,
const event::fetch::view_closure &closure)
{
return get(std::nothrow, index(std::nothrow, event_id), key, closure);
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}
bool
ircd::m::get(std::nothrow_t,
const event::idx &event_idx,
const string_view &key,
const event::fetch::view_closure &closure)
{
if(!event_idx)
return false;
const auto &column_idx
{
json::indexof<event>(key)
};
auto &column
{
dbs::event_column.at(column_idx)
};
const string_view &column_key
{
byte_view<string_view>{event_idx}
};
if(column)
return column(column_key, std::nothrow, closure);
// If the event property being sought doesn't have its own column we
// fall back to fetching the full JSON and closing over the property.
bool ret{false};
dbs::event_json(column_key, std::nothrow, [&closure, &key, &ret]
(const json::object &event)
{
string_view value
{
event[key]
};
if(!value)
return;
// The user expects an unquoted string to their closure, the same as
// if this value was found in its own column.
if(json::type(value, json::STRING))
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value = json::string(value);
ret = true;
closure(value);
});
return ret;
}
void
ircd::m::get(const vector_view<const event::idx> &event_idx,
const string_view &key,
const event::fetch::views_closure &closure)
{
const auto mask
{
get(std::nothrow, event_idx, key, closure)
};
const auto found
{
__builtin_popcountl(mask)
};
if(unlikely(size_t(found) < event_idx.size()))
throw m::NOT_FOUND
{
"Only %zu/%zu for %s found in database",
found,
event_idx.size(),
key,
};
}
uint64_t
ircd::m::get(std::nothrow_t,
const vector_view<const event::idx> &event_idx,
const string_view &key,
const event::fetch::views_closure &closure)
{
const auto &column_idx
{
json::indexof<event>(key)
};
auto &column
{
dbs::event_column.at(column_idx)
};
if(unlikely(!column))
throw panic
{
"Parallel fetch not yet supported for key '%s'",
key,
};
if(!event_idx.size())
return 0;
static const auto MAX {64UL};
const auto &num
{
std::min(event_idx.size(), MAX)
};
string_view column_key[num];
for(uint i(0); i < num; ++i)
column_key[i] = byte_view<string_view>
{
event_idx[i]
};
const vector_view<const string_view> keys
{
column_key, num
};
return column(keys, std::nothrow, [&closure]
(const vector_view<const string_view> &res)
{
closure(res);
});
}