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| platform. One simple way is to write Python scripts and register them as functions, |
| and the scripts will be executed by the <em>MesaPy executor</em>. Another way is to add native |
| functions as built-in functions, and they will be managed by the <em>Built-in executor</em>. |
| Compared to Python scripts, native built-in functions implemented in Rust are |
| memory-safe, have better performance, support more third-party libraries and |
| can be remotely attested as well. In this document, we will guide you through |
| how to add a built-in function to Teaclave step by step with a "private join and |
| compute" example.</p> <p>In this example, consider several banks have names and balance of their clients. |
| These banks want to compute the total balance of common clients in their private |
| data set without leaking the raw sensitive data to other parties. This is |
| a perfect usage scenario of the Teaclave platform, and we will provide a |
| solution by implementing a built-in function in Teaclave.</p> <h2 id="implement-built-in-functions-in-rust"><a href="#implement-built-in-functions-in-rust" class="header-anchor">#</a> Implement Built-in Functions in Rust</h2> <p>All built-in functions are implemented in the <code>teaclave_function</code> crate and can |
| be selectively compiled using feature gates. Basically, one built-in function |
| needs two things: a name and a function implementation. Follow the convention of |
| other built-in function implementations, we define our "private join and |
| compute" function like this:</p> <div class="language-rust extra-class"><pre class="language-text"><code>#[derive(Default)] |
| pub struct PrivateJoinAndCompute; |
| |
| impl PrivateJoinAndCompute { |
| pub const NAME: &'static str = "builtin-private-join-and-compute"; |
| pub fn new() -> Self { |
| Default::default() |
| } |
| pub fn run( |
| &self, |
| arguments: FunctionArguments, |
| runtime: FunctionRuntime, |
| ) -> Result<String> { |
| ... |
| Ok(summary) |
| } |
| </code></pre></div><p>The <code>NAME</code> is the identifier of a function, which is used for creating tasks. |
| Usually, the name of a built-in function starts with the <code>built-in</code> prefix. In |
| addition, we need to define an entry point of the function, which is the <code>run</code> |
| function. The <code>run</code> function can take arguments (in the <code>FunctionAruguments</code> |
| type) and runtime (in the <code>FunctionRuntime</code> type) for interacting with external |
| resources (e.g., reading/writing input/output files). Also, the <code>run</code> function |
| can return a summary of the function execution.</p> <p>Since the function arguments is in the JSON object format and can be easily |
| deserialized to a Rust struct with <code>serde_json</code>. Therefore, we define a struct |
| <code>PrivateJoinAndComputeArguments</code> which derive the <code>serde::Deserialize</code> trait for |
| the conversion. Then we implement <code>TryFrom</code> trait for the struct to convert the |
| <code>FunctionArguments</code> type to the actual <code>PrivateJoinAndComputeArguments</code> type.</p> <div class="language-rust extra-class"><pre class="language-text"><code>#[derive(serde::Deserialize)] |
| struct PrivateJoinAndComputeArguments { |
| num_user: usize, // Number of users in the multiple party computation |
| } |
| |
| impl TryFrom<FunctionArguments> for PrivateJoinAndComputeArguments { |
| type Error = anyhow::Error; |
| |
| fn try_from(arguments: FunctionArguments) -> Result<Self, Self::Error> { |
| use anyhow::Context; |
| serde_json::from_str(&arguments.into_string()).context("Cannot deserialize arguments") |
| } |
| } |
| |
| </code></pre></div><p>When executing the function, a <code>runtime</code> object will be passed to the function. |
| We can read or write files with the <code>runtime</code> with the <code>open_input</code> and |
| <code>create_output</code> functions.</p> <div class="language-rust extra-class"><pre class="language-text"><code>// Read data from a file |
| let mut input_io = runtime.open_input(&input_file_name)?; |
| input_io.read_to_end(&mut data)?; |
| ... |
| // Write data into a file |
| let mut output = runtime.create_output(&output_file_name)?; |
| output.write_all(&output_bytes)?; |
| </code></pre></div><h2 id="register-functions-in-the-executor"><a href="#register-functions-in-the-executor" class="header-anchor">#</a> Register Functions in the Executor</h2> <p>To use the function, we need to register it to the built-in executor. Please also |
| put a <code>cfg</code> attribute to make sure developers can conditionally build functions |
| into the executor.</p> <div class="language-rust extra-class"><pre class="language-text"><code>impl TeaclaveExecutor for BuiltinFunctionExecutor { |
| fn execute( |
| &self, |
| name: String, |
| arguments: FunctionArguments, |
| _payload: String, |
| runtime: FunctionRuntime, |
| ) -> Result<String> { |
| match name.as_str() { |
| ... |
| #[cfg(feature = "builtin_private_join_and_compute")] |
| PrivateJoinAndCompute::NAME => PrivateJoinAndCompute::new().run(arguments, runtime), |
| ... |
| } |
| } |
| } |
| </code></pre></div><h2 id="invoke-functions-with-the-client-sdk"><a href="#invoke-functions-with-the-client-sdk" class="header-anchor">#</a> Invoke Functions with the Client SDK</h2> <p>Finally, we can invoke the function with the client SDK. In our example, we use |
| the Python client SDK. Basically, this process includes registering input/output |
| files, creating tasks, approving tasks, invoking tasks and getting execution |
| results. You can see more details in the <code>examples/python</code> directory.</p></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">6/19/2020, 10:13:12 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev"> |
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| Apache Teaclave (incubating) is an effort undergoing incubation at The Apache |
| Software Foundation (ASF), sponsored by the Apache Incubator. |
| Incubation is required of all newly accepted projects until a further review |
| indicates that the infrastructure, communications, and decision making process |
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| incubation status is not necessarily a reflection of the completeness or |
| stability of the code, it does indicate that the project has yet to be fully |
| endorsed by the ASF. |
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