mirror of
https://github.com/matrix-construct/construct
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110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_M_FEDS_H
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/// Concurrent federation request interface. This fronts several of the m::v1
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/// requests and conducts them to all servers in a room (e.g. m::room::origins)
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/// at the same time. The hybrid control flow of this interface is best suited
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/// to the real-world uses of these operations.
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///
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/// Each call in this interface is synchronous and will block the ircd::ctx
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/// until it returns. The return value is the for_each-protocol result based on your
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/// closure (if the closure ever returns false, the function also returns false).
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///
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/// The closure is invoked asynchronously as results come in. If the closure
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/// returns false, the interface function will return immediately and all
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/// pending requests will go out of scope and may be cancelled as per
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/// ircd::server decides.
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namespace ircd::m::feds
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{
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enum class op :uint8_t;
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struct opts;
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struct result;
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struct acquire;
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using closure = std::function<bool (const result &)>;
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};
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struct ircd::m::feds::acquire
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{
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acquire(const vector_view<const opts> &, const closure &);
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acquire(const opts &, const closure &);
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};
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struct ircd::m::feds::result
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{
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const opts *request;
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string_view origin;
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std::exception_ptr eptr;
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json::object object;
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json::array array;
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};
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struct ircd::m::feds::opts
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{
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/// Operation type
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enum op op {(enum op)0};
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/// Timeout for this operation. For a batch of operations, this system
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/// may attempt -- but does not guarantee -- to cancel timed-out requests
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/// before the highest timeout value in the batch.
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milliseconds timeout {20000L};
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/// Apropos room_id: this is almost always required for this interface
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/// because the servers in the room is used for the request target set.
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m::room::id room_id;
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/// Apropos event_id for several operations.
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m::event::id event_id;
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/// Apropos user_id for several operations.
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m::user::id user_id;
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/// Misc string argument registers. These convey values for special
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/// features in individual operations.
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string_view arg[4]; // misc argv
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/// Misc integer argument registers. These convey values for special
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/// features in individual operations.
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uint64_t argi[4]; // misc integer argv
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/// Whether exceptions from the supplied result closure are propagated.
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bool nothrow_closure {false};
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/// When nothrow_closure is true, this determines whether or not to
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/// continue receiving results or to break and return. True to continue.
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bool nothrow_closure_retval {true};
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/// Whether to call the user's result closure for error results, which
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/// would have the eptr set. When this is false, the closure is never
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/// invoked with eptr set and nothrow_closure_retval is used to continue.
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bool closure_errors {true};
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/// Whether to call the user's result closure with a cached error result
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/// before the request is even made to the remote. If false (the default)
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/// the user's closure is never invoked and no request is made if a remote
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/// has a cached error.
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bool closure_cached_errors {false};
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};
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enum class ircd::m::feds::op
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:uint8_t
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{
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noop,
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head,
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auth ,
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event,
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state,
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backfill,
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version,
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keys,
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send,
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};
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