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f4f1506df0
Can be useful for end point logging.
57 lines
3.2 KiB
C++
57 lines
3.2 KiB
C++
#pragma once
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#include <vector>
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#include "connections.h"
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namespace lokimq {
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class LokiMQ;
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/// Encapsulates an incoming message from a remote connection with message details plus extra
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/// info need to send a reply back through the proxy thread via the `reply()` method. Note that
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/// this object gets reused: callbacks should use but not store any reference beyond the callback.
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class Message {
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public:
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LokiMQ& lokimq; ///< The owning LokiMQ object
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std::vector<string_view> data; ///< The provided command data parts, if any.
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ConnectionID conn; ///< The connection info for routing a reply; also contains the pubkey/sn status.
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std::string reply_tag; ///< If the invoked command is a request command this is the required reply tag that will be prepended by `send_reply()`.
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Access access; ///< The access level of the invoker. This can be higher than the access level of the command, for example for an admin invoking a basic command.
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std::string remote; ///< Some sort of remote address from which the request came. Often "IP" for TCP connections and "localhost:UID:GID:PID" for UDP connections.
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/// Constructor
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Message(LokiMQ& lmq, ConnectionID cid, Access access, std::string remote)
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: lokimq{lmq}, conn{std::move(cid)}, access{std::move(access)}, remote{std::move(remote)} {}
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// Non-copyable
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Message(const Message&) = delete;
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Message& operator=(const Message&) = delete;
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/// Sends a command back to whomever sent this message. Arguments are forwarded to send() but
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/// with send_option::optional{} added if the originator is not a SN. For SN messages (i.e.
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/// where `sn` is true) this is a "strong" reply by default in that the proxy will attempt to
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/// establish a new connection to the SN if no longer connected. For non-SN messages the reply
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/// will be attempted using the available routing information, but if the connection has already
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/// been closed the reply will be dropped.
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///
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/// If you want to send a non-strong reply even when the remote is a service node then add
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/// an explicit `send_option::optional()` argument.
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template <typename... Args>
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void send_back(string_view, Args&&... args);
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/// Sends a reply to a request. This takes no command: the command is always the built-in
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/// "REPLY" command, followed by the unique reply tag, then any reply data parts. All other
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/// arguments are as in `send_back()`. You should only send one reply for a command expecting
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/// replies, though this is not enforced: attempting to send multiple replies will simply be
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/// dropped when received by the remote. (Note, however, that it is possible to send multiple
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/// messages -- e.g. you could send a reply and then also call send_back() and/or send_request()
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/// to send more requests back to the sender).
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template <typename... Args>
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void send_reply(Args&&... args);
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/// Sends a request back to whomever sent this message. This is effectively a wrapper around
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/// lmq.request() that takes care of setting up the recipient arguments.
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template <typename ReplyCallback, typename... Args>
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void send_request(string_view cmd, ReplyCallback&& callback, Args&&... args);
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};
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}
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