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Merge pull request #229 from 107-systems/port-id-config-reg
[example/host] Port ID shall be configurable via register.
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87 changes: 87 additions & 0 deletions
87
examples/host-example-01-opencyphal-basic-node/kv_host.cpp
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,87 @@ | ||
| /** | ||
| * This software is distributed under the terms of the MIT License. | ||
| * Copyright (c) 2023 LXRobotics. | ||
| * Author: Alexander Entinger <[email protected]> | ||
| * Contributors: https://github.com/107-systems/107-Arduino-Cyphal-Support/graphs/contributors. | ||
| */ | ||
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| /************************************************************************************** | ||
| * INCLUDE | ||
| **************************************************************************************/ | ||
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| #include "kv_host.h" | ||
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| #if !defined(__GNUC__) || (__GNUC__ >= 11) | ||
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| #include <cstdio> | ||
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| #include <sstream> | ||
| #include <fstream> | ||
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| /************************************************************************************** | ||
| * NAMESPACE | ||
| **************************************************************************************/ | ||
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| namespace cyphal::support::platform::storage::host | ||
| { | ||
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| /************************************************************************************** | ||
| * PRIVATE FREE FUNCTIONS | ||
| **************************************************************************************/ | ||
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| [[nodiscard]] static inline std::string toFilename(std::string_view const key) | ||
| { | ||
| auto const key_hash = std::hash<std::string_view>{}(key); | ||
| std::stringstream key_filename; | ||
| key_filename << key_hash; | ||
| return key_filename.str(); | ||
| } | ||
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| /************************************************************************************** | ||
| * PUBLIC MEMBER FUNCTIONS | ||
| **************************************************************************************/ | ||
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| auto KeyValueStorage::get(const std::string_view key, const std::size_t size, void* const data) const | ||
| -> std::variant<Error, std::size_t> | ||
| { | ||
| std::ifstream in(toFilename(key), std::ifstream::in | std::ifstream::binary); | ||
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| if (!in.good()) | ||
| return Error::Existence; | ||
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| in.read(static_cast<char *>(data), size); | ||
| size_t const bytes_read = in ? size : in.gcount(); | ||
| in.close(); | ||
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| return bytes_read; | ||
| } | ||
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| auto KeyValueStorage::put(const std::string_view key, const std::size_t size, const void* const data) | ||
| -> std::optional<Error> | ||
| { | ||
| std::ofstream out(toFilename(key), std::ofstream::in | std::ofstream::binary | std::ofstream::trunc); | ||
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| if (!out.good()) | ||
| return Error::Existence; | ||
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| out.write(static_cast<const char *>(data), size); | ||
| out.close(); | ||
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| return std::nullopt; | ||
| } | ||
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| auto KeyValueStorage::drop(const std::string_view key) -> std::optional<Error> | ||
| { | ||
| if (std::remove(toFilename(key).c_str())) | ||
| return Error::IO; | ||
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| return std::nullopt; | ||
| } | ||
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| /************************************************************************************** | ||
| * NAMESPACE | ||
| **************************************************************************************/ | ||
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| } /* cyphal::support::platform::storage::host */ | ||
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| #endif /* !defined(__GNUC__) || (__GNUC__ >= 11) */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /** | ||
| * This software is distributed under the terms of the MIT License. | ||
| * Copyright (c) 2023 LXRobotics. | ||
| * Author: Alexander Entinger <[email protected]> | ||
| * Contributors: https://github.com/107-systems/107-Arduino-Cyphal-Support/graphs/contributors. | ||
| */ | ||
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| #pragma once | ||
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| /************************************************************************************** | ||
| * INCLUDE | ||
| **************************************************************************************/ | ||
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| #include <107-Arduino-Cyphal.h> | ||
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| #if !defined(__GNUC__) || (__GNUC__ >= 11) | ||
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| /************************************************************************************** | ||
| * NAMESPACE | ||
| **************************************************************************************/ | ||
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| namespace cyphal::support::platform::storage::host | ||
| { | ||
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| /************************************************************************************** | ||
| * CLASS DECLARATION | ||
| **************************************************************************************/ | ||
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| class KeyValueStorage final : public interface::KeyValueStorage | ||
| { | ||
| public: | ||
| KeyValueStorage() { } | ||
| virtual ~KeyValueStorage() { } | ||
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| /// The return value is the number of bytes read into the buffer or the error. | ||
| [[nodiscard]] virtual auto get(const std::string_view key, const std::size_t size, void* const data) const | ||
| -> std::variant<Error, std::size_t> override; | ||
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| /// Existing data, if any, is replaced entirely. New file and its parent directories created implicitly. | ||
| /// Either all or none of the data bytes are written. | ||
| [[nodiscard]] virtual auto put(const std::string_view key, const std::size_t size, const void* const data) | ||
| -> std::optional<Error> override; | ||
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| /// Remove key. If the key does not exist, the existence error is returned. | ||
| [[nodiscard]] virtual auto drop(const std::string_view key) -> std::optional<Error> override; | ||
| }; | ||
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| /************************************************************************************** | ||
| * NAMESPACE | ||
| **************************************************************************************/ | ||
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| } /* cyphal::support::platform::storage::host */ | ||
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| #endif /* !defined(__GNUC__) || (__GNUC__ >= 11) */ |