Add rustfmt and Github CI

.github/workflows/build.yml

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+name: Continuous Integration Checks
+
+on: [ push, pull_request ]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        toolchain: [ stable, beta ]
+        include:
+          - toolchain: stable
+            check-fmt: true
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v3
+      - name: Install Protobuf compiler (protoc)
+        run: sudo apt-get update && sudo apt-get -y install protobuf-compiler
+      - name: Install Rust ${{ matrix.toolchain }} toolchain
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile=minimal --default-toolchain ${{ matrix.toolchain }}
+          rustup override set ${{ matrix.toolchain }}
+      - name: Build on Rust ${{ matrix.toolchain }}
+        run: cargo build --verbose --color always
+      - name: Check formatting
+        if: matrix.check-fmt
+        run: rustup component add rustfmt && cargo fmt --all -- --check
+      - name: Test on Rust ${{ matrix.toolchain }}
+        run: cargo test
+      - name: Cargo check release on Rust ${{ matrix.toolchain }}
+        run: cargo check --release
+      - name: Cargo check doc on Rust ${{ matrix.toolchain }}
+        run: cargo doc --release

.gitignore

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+/target
+/vss-accessor/src/proto/

Cargo.toml

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+[workspace]
+members = [
+    "vss-accessor",
+]

rustfmt.toml

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+hard_tabs = true # use tab characters for indentation, spaces for alignment
+use_field_init_shorthand = true
+max_width = 120
+use_small_heuristics = "Max"
+chain_width = 80
+fn_args_layout = "Compressed"

vss-accessor/Cargo.toml

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+[package]
+name = "vss-accessor"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+
+[dependencies]
+
+[dev-dependencies]
+
+[build-dependencies]
+prost-build = { version = "0.11.3" }
+reqwest =  { version = "0.11.13", features = ["blocking"] }
+
+[features]
+genproto = []

vss-accessor/build.rs

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+extern crate prost_build;
+
+use std::fs::File;
+use std::path::Path;
+use std::{env, fs};
+
+/// To generate updated proto objects:
+/// 1. Place `vss.proto` file in `src/proto/`
+/// 2. run `cargo build --features=genproto`
+fn main() {
+	#[cfg(feature = "genproto")]
+	generate_protos();
+}
+
+#[cfg(feature = "genproto")]
+fn generate_protos() {
+	download_file(
+				"https://raw.githubusercontent.com/lightningdevkit/vss-server/ff4b5fc6a079ed8719eb8be7ec35ca1d01c1cc55/app/src/main/proto/vss.proto",
+				"src/proto/vss.proto",
+		).unwrap();
+
+	prost_build::compile_protos(&["src/proto/vss.proto"], &["src/"]).unwrap();
+	let from_path = Path::new(&env::var("OUT_DIR").unwrap()).join("org.vss.rs");
+	fs::copy(from_path, "src/generated-src/org.vss.rs").unwrap();
+}
+
+#[cfg(feature = "genproto")]
+fn download_file(url: &str, save_to: &str) -> Result<(), Box<dyn std::error::Error>> {
+	let mut response = reqwest::blocking::get(url)?;
+	fs::create_dir_all(Path::new(save_to).parent().unwrap())?;
+	let mut out_file = File::create(save_to)?;
+	response.copy_to(&mut out_file)?;
+	Ok(())
+}

vss-accessor/src/generated-src/org.vss.rs

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+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct GetObjectRequest {
+    /// store_id is a keyspace identifier.
+    /// Ref: <https://en.wikipedia.org/wiki/Keyspace_(distributed_data_store>)
+    /// All APIs operate within a single store_id.
+    /// It is up to clients to use single or multiple stores for their use-case.
+    /// This can be used for client-isolation/ rate-limiting / throttling on the server-side.
+    /// Authorization and billing can also be performed at the store_id level.
+    #[prost(string, tag = "1")]
+    pub store_id: ::prost::alloc::string::String,
+    /// Key for which the value is to be fetched.
+    ///
+    /// Consistency Guarantee:
+    /// Get(read) operations against a key are consistent reads and will reflect all previous writes,
+    /// since Put/Write provides read-after-write and read-after-update consistency guarantees.
+    ///
+    /// Read Isolation:
+    /// Get/Read operations against a key are ensured to have read-committed isolation.
+    /// Ref: <https://en.wikipedia.org/wiki/Isolation_(database_systems>)#Read_committed
+    #[prost(string, tag = "2")]
+    pub key: ::prost::alloc::string::String,
+}
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct GetObjectResponse {
+    /// Fetched value and version along with the corresponding key in the request.
+    #[prost(message, optional, tag = "2")]
+    pub value: ::core::option::Option<KeyValue>,
+}
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct PutObjectRequest {
+    /// store_id is a keyspace identifier.
+    /// Ref: <https://en.wikipedia.org/wiki/Keyspace_(distributed_data_store>)
+    /// All APIs operate within a single store_id.
+    /// It is up to clients to use single or multiple stores for their use-case.
+    /// This can be used for client-isolation/ rate-limiting / throttling on the server-side.
+    /// Authorization and billing can also be performed at the store_id level.
+    #[prost(string, tag = "1")]
+    pub store_id: ::prost::alloc::string::String,
+    /// global_version is a sequence-number/version of the whole store. This can be used for versioning
+    /// and ensures that multiple updates in case of multiple devices can only be done linearly, even
+    /// if those updates did not directly conflict with each other based on keys/transaction_items.
+    ///
+    /// If present, the write will only succeed if the current server-side global_version against
+    /// the store_id is same as in the request.
+    /// Clients are expected to store (client-side) the global version against store_id.
+    /// The request must contain their client-side value of global_version if global versioning and
+    /// conflict detection is desired.
+    ///
+    /// For the first write of the store, global version should be '0'. If the write succeeds, clients
+    /// must increment their global version (client-side) by 1.
+    /// The server increments global_version (server-side) for every successful write, hence this
+    /// client-side increment is required to ensure matching versions. This updated global version
+    /// should be used in subsequent PutObjectRequests for the store.
+    ///
+    /// Requests with a conflicting version will fail with `CONFLICT_EXCEPTION` as ErrorCode.
+    #[prost(int64, optional, tag = "2")]
+    pub global_version: ::core::option::Option<i64>,
+    /// Items to be written as a result of this PutObjectRequest.
+    ///
+    /// In an item, each key is supplied with its corresponding value and version.
+    /// Clients can choose to encrypt the keys client-side in order to obfuscate their usage patterns.
+    /// If the write is successful, the previous value corresponding to the key will be overwritten.
+    ///
+    /// Multiple items in transaction_items of a single PutObjectRequest are written in
+    /// a database-transaction in an all-or-nothing fashion.
+    /// Items in a single PutObjectRequest must have distinct keys.
+    ///
+    /// Clients are expected to store a version against every key.
+    /// The write will succeed if the current DB version against the key is the same as in the request.
+    /// When initiating a PutObjectRequest, the request should contain their client-side version for
+    /// that key-value.
+    ///
+    /// For the first write of any key, the version should be '0'. If the write succeeds, the client
+    /// must increment their corresponding key versions (client-side) by 1.
+    /// The server increments key versions (server-side) for every successful write, hence this
+    /// client-side increment is required to ensure matching versions. These updated key versions should
+    /// be used in subsequent PutObjectRequests for the keys.
+    ///
+    /// Requests with a conflicting version will fail with `CONFLICT_EXCEPTION` as ErrorCode.
+    ///
+    /// Considerations for transactions:
+    /// Transaction writes of multiple items have a performance overhead, hence it is recommended to use
+    /// them only if required by the client application to ensure logic/code correctness.
+    /// That is, transaction_items are not a substitute for batch-write of multiple unrelated items.
+    /// When a write of multiple unrelated items is desired, it is recommended to use separate
+    /// PutObjectRequests.
+    ///
+    /// Consistency guarantee:
+    /// All PutObjectRequests are strongly consistent i.e. they provide read-after-write and
+    /// read-after-update consistency guarantees.
+    #[prost(message, repeated, tag = "3")]
+    pub transaction_items: ::prost::alloc::vec::Vec<KeyValue>,
+}
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct PutObjectResponse {}
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ListKeyVersionsRequest {
+    /// store_id is a keyspace identifier.
+    /// Ref: <https://en.wikipedia.org/wiki/Keyspace_(distributed_data_store>)
+    /// All APIs operate within a single store_id.
+    /// It is up to clients to use single or multiple stores for their use-case.
+    /// This can be used for client-isolation/ rate-limiting / throttling on the server-side.
+    /// Authorization and billing can also be performed at the store_id level.
+    #[prost(string, tag = "1")]
+    pub store_id: ::prost::alloc::string::String,
+    /// A key_prefix is a string of characters at the beginning of the key. Prefixes can be used as
+    /// a way to organize key-values in a similar way to directories.
+    ///
+    /// If key_prefix is specified, the response results will be limited to those keys that begin with
+    /// the specified prefix.
+    ///
+    /// If no key_prefix is specified or it is empty (""), all the keys are eligible to be returned in
+    /// the response.
+    #[prost(string, optional, tag = "2")]
+    pub key_prefix: ::core::option::Option<::prost::alloc::string::String>,
+    /// page_size is used by clients to specify the maximum number of results that can be returned by
+    /// the server.
+    /// The server may further constrain the maximum number of results returned in a single page.
+    /// If the page_size is 0 or not set, the server will decide the number of results to be returned.
+    #[prost(int32, optional, tag = "3")]
+    pub page_size: ::core::option::Option<i32>,
+    /// page_token is a pagination token.
+    ///
+    /// To query for the first page of ListKeyVersions, page_token must not be specified.
+    ///
+    /// For subsequent pages, use the value that was returned as `next_page_token` in the previous
+    /// page's ListKeyVersionsResponse.
+    #[prost(string, optional, tag = "4")]
+    pub page_token: ::core::option::Option<::prost::alloc::string::String>,
+}
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ListKeyVersionsResponse {
+    /// Fetched keys and versions.
+    /// Even though this API reuses KeyValue struct, the value sub-field will not be set by the server.
+    #[prost(message, repeated, tag = "1")]
+    pub key_versions: ::prost::alloc::vec::Vec<KeyValue>,
+    /// next_page_token is a pagination token, used to retrieve the next page of results.
+    /// Use this value to query for next_page of paginated ListKeyVersions operation, by specifying
+    /// this value as the `page_token` in the next request.
+    ///
+    /// If next_page_token is empty (""), then the "last page" of results has been processed and
+    /// there is no more data to be retrieved.
+    ///
+    /// If next_page_token is not empty, it does not necessarily mean that there is more data in the
+    /// result set. The only way to know when you have reached the end of the result set is when
+    /// next_page_token is empty.
+    ///
+    /// Caution: Clients must not assume a specific number of key_versions to be present in a page for
+    /// paginated response.
+    #[prost(string, optional, tag = "2")]
+    pub next_page_token: ::core::option::Option<::prost::alloc::string::String>,
+    /// global_version is a sequence-number/version of the whole store.
+    ///
+    /// global_version is only returned in response for the first page of the ListKeyVersionsResponse
+    /// and is guaranteed to be read before reading any key-versions.
+    ///
+    /// In case of refreshing the complete key-version view on the client-side, correct usage for
+    /// the returned global_version is as following:
+    ///    1. Read global_version from the first page of paginated response and save it as local variable.
+    ///    2. Update all the key_versions on client-side from all the pages of paginated response.
+    ///    3. Update global_version on client_side from the local variable saved in step-1.
+    /// This ensures that on client-side, all current key_versions were stored at global_version or later.
+    /// This guarantee is helpful for ensuring the versioning correctness if using the global_version
+    /// in PutObject API and can help avoid the race conditions related to it.
+    #[prost(int64, optional, tag = "3")]
+    pub global_version: ::core::option::Option<i64>,
+}
+/// When HttpStatusCode is not ok (200), the response `content` contains a serialized ErrorResponse
+/// with the relevant ErrorCode and message
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ErrorResponse {
+    /// The error code uniquely identifying an error condition.
+    /// It is meant to be read and understood programmatically by code that detects/handles errors by
+    /// type.
+    #[prost(enumeration = "ErrorCode", tag = "1")]
+    pub error_code: i32,
+    /// The error message containing a generic description of the error condition in English.
+    /// It is intended for a human audience only and should not be parsed to extract any information
+    /// programmatically. Client-side code may use it for logging only.
+    #[prost(string, tag = "2")]
+    pub message: ::prost::alloc::string::String,
+}
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct KeyValue {
+    /// Key against which the value is stored.
+    #[prost(string, tag = "1")]
+    pub key: ::prost::alloc::string::String,
+    /// Version field is used for key-level versioning.
+    /// For first write of key, version should be '0'. If the write succeeds, clients must increment
+    /// their corresponding key version (client-side) by 1.
+    /// The server increments key version (server-side) for every successful write, hence this
+    /// client-side increment is required to ensure matching versions. These updated key versions should
+    /// be used in subsequent PutObjectRequests for the keys.
+    #[prost(int64, tag = "2")]
+    pub version: i64,
+    /// Object value in bytes which is stored (in put) and fetched (in get).
+    /// Clients must encrypt this blob client-side before sending it over the wire to server in order
+    /// to preserve privacy and security.
+    #[prost(bytes = "vec", tag = "3")]
+    pub value: ::prost::alloc::vec::Vec<u8>,
+}
+/// ErrorCodes to be used in ErrorResponse
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, ::prost::Enumeration)]
+#[repr(i32)]
+pub enum ErrorCode {
+    /// Default protobuf Enum value. Will not be used as ErrorCode by server.
+    Unknown = 0,
+    /// CONFLICT_EXCEPTION is used when the request contains mismatched version (either key or global)
+    /// in PutObjectRequest. For more info refer PutObjectRequest.
+    ConflictException = 1,
+    /// INVALID_REQUEST_EXCEPTION is used in the following cases:
+    ///    - The request was missing a required argument.
+    ///    - The specified argument was invalid, incomplete or in the wrong format.
+    ///    - The request body of api cannot be deserialized into corresponding protobuf object.
+    InvalidRequestException = 2,
+    /// An internal server error occurred, client is probably at no fault and can safely retry this
+    /// error with exponential backoff.
+    InternalServerException = 3,
+}
+impl ErrorCode {
+    /// String value of the enum field names used in the ProtoBuf definition.
+    ///
+    /// The values are not transformed in any way and thus are considered stable
+    /// (if the ProtoBuf definition does not change) and safe for programmatic use.
+    pub fn as_str_name(&self) -> &'static str {
+        match self {
+            ErrorCode::Unknown => "UNKNOWN",
+            ErrorCode::ConflictException => "CONFLICT_EXCEPTION",
+            ErrorCode::InvalidRequestException => "INVALID_REQUEST_EXCEPTION",
+            ErrorCode::InternalServerException => "INTERNAL_SERVER_EXCEPTION",
+        }
+    }
+    /// Creates an enum from field names used in the ProtoBuf definition.
+    pub fn from_str_name(value: &str) -> ::core::option::Option<Self> {
+        match value {
+            "UNKNOWN" => Some(Self::Unknown),
+            "CONFLICT_EXCEPTION" => Some(Self::ConflictException),
+            "INVALID_REQUEST_EXCEPTION" => Some(Self::InvalidRequestException),
+            "INTERNAL_SERVER_EXCEPTION" => Some(Self::InternalServerException),
+            _ => None,
+        }
+    }
+}

vss-accessor/src/lib.rs

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+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]