refactor: use shared aggregator client for signer and aggregrator

internal/mithril-aggregator-client/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mithril-aggregator-client"
-version = "0.1.1"
+version = "0.1.2"
 description = "Client to request data from a Mithril Aggregator"
 authors.workspace = true
 documentation.workspace = true

internal/mithril-aggregator-client/README.md

@@ -1,3 +1,39 @@
 # Mithril-aggregator-client [![CI workflow](https://github.com/input-output-hk/mithril/actions/workflows/ci.yml/badge.svg)](https://github.com/input-output-hk/mithril/actions/workflows/ci.yml) [![License](https://img.shields.io/badge/license-Apache%202.0-blue?style=flat-square)](https://github.com/input-output-hk/mithril/blob/main/LICENSE) [![Discord](https://img.shields.io/discord/500028886025895936.svg?logo=discord&style=flat-square)](https://discord.gg/5kaErDKDRq)
 
-This crate provides a client to request data from a Mithril Aggregator.
+This crate provides a client to request data from a Mithril Aggregator over http.
+
+## Configuration of http features
+
+Reqwest is used as the backend for the http client. Its default features are disabled to let the user control
+which [features to enable](https://docs.rs/reqwest/latest/reqwest/#optional-features).
+
+To enable a reqwest feature, add the following to your `Cargo.toml`:
+
+```toml
+reqwest = { version = "x.yy", features = ["feature_a", "feature_b"] }
+```
+
+for example, if reqwest is a workspace dependency, and you want to enable the `default` feature and the compression features:
+
+```toml
+reqwest = { workspace = true, features = [
+    "default",
+    "gzip",
+    "zstd",
+    "deflate",
+    "brotli"
+] }
+```
+
+### Unused dependency warning
+
+You should add the `reqwest` dependency even if you don't use it directly in your code.
+If you are using [`cargo machete`](https://github.com/bnjbvr/cargo-machete) to track unused dependencies, it will raise a warning.
+
+To avoid this warning, add the following to your `Cargo.toml`:
+
+```toml
+[package.metadata.cargo-machete]
+# reqwest: for features configuration, indirect dependency via `mithril-aggregator-client`
+ignored = ["reqwest"]
+```

internal/mithril-aggregator-client/src/builder.rs

@@ -2,17 +2,18 @@ use anyhow::Context;
 use reqwest::{Client, IntoUrl, Proxy, Url};
 use slog::{Logger, o};
 use std::collections::HashMap;
+use std::sync::Arc;
 use std::time::Duration;
 
 use mithril_common::StdResult;
 use mithril_common::api_version::APIVersionProvider;
 
-use crate::client::AggregatorClient;
+use crate::client::AggregatorHttpClient;
 
-/// A builder of [AggregatorClient]
+/// A builder of [AggregatorHttpClient]
 pub struct AggregatorClientBuilder {
     aggregator_url_result: reqwest::Result<Url>,
-    api_version_provider: Option<APIVersionProvider>,
+    api_version_provider: Option<Arc<APIVersionProvider>>,
     additional_headers: Option<HashMap<String, String>>,
     timeout_duration: Option<Duration>,
     relay_endpoint: Option<String>,
@@ -41,7 +42,10 @@ impl AggregatorClientBuilder {
     }
 
     /// Set the [APIVersionProvider] to use.
-    pub fn with_api_version_provider(mut self, api_version_provider: APIVersionProvider) -> Self {
+    pub fn with_api_version_provider(
+        mut self,
+        api_version_provider: Arc<APIVersionProvider>,
+    ) -> Self {
         self.api_version_provider = Some(api_version_provider);
         self
     }
@@ -59,13 +63,13 @@ impl AggregatorClientBuilder {
     }
 
     /// Set the address of the relay
-    pub fn with_relay_endpoint(mut self, relay_endpoint: String) -> Self {
-        self.relay_endpoint = Some(relay_endpoint);
+    pub fn with_relay_endpoint(mut self, relay_endpoint: Option<String>) -> Self {
+        self.relay_endpoint = relay_endpoint;
         self
     }
 
-    /// Returns an [AggregatorClient] based on the builder configuration
-    pub fn build(self) -> StdResult<AggregatorClient> {
+    /// Returns an [AggregatorHttpClient] based on the builder configuration
+    pub fn build(self) -> StdResult<AggregatorHttpClient> {
         let aggregator_endpoint =
             enforce_trailing_slash(self.aggregator_url_result.with_context(
                 || "Invalid aggregator endpoint, it must be a correctly formed url",
@@ -80,7 +84,7 @@ impl AggregatorClientBuilder {
                 .proxy(Proxy::all(relay_endpoint).with_context(|| "Relay proxy creation failed")?)
         }
 
-        Ok(AggregatorClient {
+        Ok(AggregatorHttpClient {
             aggregator_endpoint,
             api_version_provider,
             additional_headers: (&additional_headers)