45 lines
1.8 KiB
C++
45 lines
1.8 KiB
C++
#pragma once
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#include "fgc/IControlChannel.h"
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#include <string>
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namespace fgc {
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// Topic names and payload encoding for the control channel, kept here rather
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// than inside MqttControlChannel so the null channel produces byte-identical
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// output (its history has to show what WOULD have been sent, not an
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// approximation) and so the JSON is unit-testable without a broker.
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//
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// Scheme: GGS/FWT/<tower>/<leaf> — see docs/mqtt-api.md.
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// Leaf names, so the two channels and the UI agree on spelling.
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inline constexpr const char* kTopicTargetHdg = "target_HDG";
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inline constexpr const char* kTopicControlCode = "ControlCode";
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inline constexpr const char* kTopicStatusCode = "StatusCode";
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inline constexpr const char* kTopicCamEvent = "CamEvent";
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// Any console command, in; its answer, out. See docs/mqtt-api.md.
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inline constexpr const char* kTopicCommand = "Command";
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inline constexpr const char* kTopicCommandReply = "CommandReply";
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std::string towerTopic(const std::string& tower, const std::string& leaf);
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// Payload builders. One definition each, used by both channels.
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std::string camEventJson(const CamEvent& e);
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// A Command payload: {"id":"...","cmd":"..."} (a flat JSON object of strings;
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// other keys ignored), or a bare command line with no id - for testing from a
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// shell. On a payload that is neither, `error` says why.
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RemoteCommand parseCommandPayload(const std::string& payload);
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// A CommandReply payload. Caps the lines at kReplyMaxLines / kReplyMaxBytes and
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// sets `truncated` when it had to cut.
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inline constexpr size_t kReplyMaxLines = 200;
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inline constexpr size_t kReplyMaxBytes = 16 * 1024;
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std::string commandReplyJson(const CommandReply& r);
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// A JSON string literal, quotes included, with the escapes JSON requires.
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std::string jsonString(const std::string& s);
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} // namespace fgc
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