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ircd:Ⓜ️:fed: Improve observer interface; employ opts; document/comments.

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This commit is contained in:
Jason Volk 2020-10-14 21:56:28 -07:00
parent 3f6d90c7a8
commit 7bac03372d
1 changed files with 52 additions and 23 deletions
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75
matrix/fed.cc
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@ -1546,88 +1546,117 @@ namespace ircd::m::fed
template<class closure>
static decltype(auto)
with_server(const string_view &,
const well_known::opts &,
closure &&);
}
template<class closure>
decltype(auto)
ircd::m::fed::with_server(const string_view &origin,
ircd::m::fed::with_server(const string_view &name,
const well_known::opts &opts,
closure&& c)
{
char buf[rfc3986::DOMAIN_BUFSIZE];
const auto remote
{
server(buf, origin)
server(buf, name, opts)
};
return c(remote);
}
/// Manually force the clearing of cached errors for remote server to
/// allow another attempt. Note that not all possible cached errors may
/// be cleared by this.
bool
ircd::m::fed::clear_error(const string_view &origin)
ircd::m::fed::clear_error(const string_view &name)
{
return with_server(origin, []
well_known::opts opts;
opts.request = false;
opts.expired = true;
return with_server(name, opts, []
(const auto &remote)
{
return server::errclear(remote);
});
}
/// avail() reports that a remote server is resolved and ready to take
/// requests; a network connection is just not established.
bool
ircd::m::fed::avail(const string_view &origin)
ircd::m::fed::avail(const string_view &name)
{
return with_server(origin, []
well_known::opts opts;
opts.request = false;
opts.expired = true;
return with_server(name, opts, []
(const auto &remote)
{
return server::avail(remote);
});
}
/// linked() reports that we are actively and currently engaged with the remote
/// server over the network; requests are likely to succeed.
bool
ircd::m::fed::exists(const string_view &origin)
ircd::m::fed::linked(const string_view &name)
{
return with_server(origin, []
(const auto &remote)
{
return server::exists(remote);
});
}
bool
ircd::m::fed::linked(const string_view &origin)
{
return with_server(origin, []
well_known::opts opts;
opts.request = false;
opts.expired = true;
return with_server(name, opts, []
(const auto &remote)
{
return server::linked(remote);
});
}
/// errant() reports that contacting the remote server is known to not work.
/// False during nominal operation, including before any contact has been
/// attempted or after all cached errors have expired.
bool
ircd::m::fed::errant(const string_view &origin)
ircd::m::fed::errant(const string_view &name)
{
return with_server(origin, []
well_known::opts opts;
opts.request = false;
opts.expired = true;
return with_server(name, opts, []
(const auto &remote)
{
return server::errant(remote);
});
}
/// exists() reports that contact has been made with the remote server. This
/// does not indicate success or failure for prior or active engagements.
bool
ircd::m::fed::exists(const string_view &name)
{
well_known::opts opts;
opts.request = false;
opts.expired = true;
return with_server(name, opts, []
(const auto &remote)
{
return server::exists(remote);
});
}
ircd::string_view
ircd::m::fed::server(const mutable_buffer &buf,
const string_view &origin,
const string_view &name,
const well_known::opts &opts)
{
net::hostport remote
{
origin
name
};
string_view target
{
!port(remote)?
well_known::get(buf, host(remote), opts):
origin
name
};
remote = target;