Initial version of random number server (#1103)

* feat(pyth-rng): first draft of pyth-rng

* adding api

* ok that wasnt so bad

* minor stuff

* add command to get current request

* refactor config

* refactor

* refactor

* ok

* ok

* it works

* blah

* stuff

* stuff

* builds

* builds

* ok it works

* more stuff

* cleanup

* ok stuff

* format

* docs

* ali comments

* correct fee

* warnings

---------

Co-authored-by: Reisen <reisen@morphism.org>

.pre-commit-config.yaml

@@ -65,6 +65,13 @@ repos:
         entry: cargo +nightly-2023-07-23 fmt --manifest-path ./hermes/Cargo.toml --all -- --config-path rustfmt.toml
         pass_filenames: false
         files: hermes
+      # Hooks for pyth-rng
+      - id: cargo-fmt-pyth-rng
+        name: Cargo format for Pyth RNG
+        language: "rust"
+        entry: cargo +nightly-2023-07-23 fmt --manifest-path ./pyth-rng/Cargo.toml --all -- --config-path rustfmt.toml
+        pass_filenames: false
+        files: pyth-rng
       # Hooks for message buffer contract
       - id: cargo-fmt-message-buffer
         name: Cargo format for message buffer contract

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pyth-rng/src/abi.json

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+    "inputs": [],
+    "name": "InsufficientFee",
+    "type": "error"
+  },
+  {
+    "inputs": [],
+    "name": "NoSuchProvider",
+    "type": "error"
+  },
+  {
+    "inputs": [],
+    "name": "OutOfRandomness",
+    "type": "error"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "components": [
+          {
+            "internalType": "uint256",
+            "name": "feeInWei",
+            "type": "uint256"
+          },
+          {
+            "internalType": "uint256",
+            "name": "accruedFeesInWei",
+            "type": "uint256"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "originalCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "originalCommitmentSequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "commitmentMetadata",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "endSequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "uint64",
+            "name": "sequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "currentCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "currentCommitmentSequenceNumber",
+            "type": "uint64"
+          }
+        ],
+        "indexed": false,
+        "internalType": "struct PythRandomStructs.ProviderInfo",
+        "name": "provider",
+        "type": "tuple"
+      }
+    ],
+    "name": "Registered",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "components": [
+          {
+            "internalType": "address",
+            "name": "provider",
+            "type": "address"
+          },
+          {
+            "internalType": "uint64",
+            "name": "sequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "userCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "providerCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "providerCommitmentSequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "providerCommitmentMetadata",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint256",
+            "name": "blockNumber",
+            "type": "uint256"
+          }
+        ],
+        "indexed": false,
+        "internalType": "struct PythRandomStructs.Request",
+        "name": "request",
+        "type": "tuple"
+      }
+    ],
+    "name": "Requested",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "components": [
+          {
+            "internalType": "address",
+            "name": "provider",
+            "type": "address"
+          },
+          {
+            "internalType": "uint64",
+            "name": "sequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "userCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "providerCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "providerCommitmentSequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "providerCommitmentMetadata",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint256",
+            "name": "blockNumber",
+            "type": "uint256"
+          }
+        ],
+        "indexed": false,
+        "internalType": "struct PythRandomStructs.Request",
+        "name": "request",
+        "type": "tuple"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes32",
+        "name": "userRevelation",
+        "type": "bytes32"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes32",
+        "name": "providerRevelation",
+        "type": "bytes32"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes32",
+        "name": "blockHash",
+        "type": "bytes32"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes32",
+        "name": "randomNumber",
+        "type": "bytes32"
+      }
+    ],
+    "name": "Revealed",
+    "type": "event"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "bytes32",
+        "name": "userRandomness",
+        "type": "bytes32"
+      },
+      {
+        "internalType": "bytes32",
+        "name": "providerRandomness",
+        "type": "bytes32"
+      },
+      {
+        "internalType": "bytes32",
+        "name": "blockHash",
+        "type": "bytes32"
+      }
+    ],
+    "name": "combineRandomValues",
+    "outputs": [
+      {
+        "internalType": "bytes32",
+        "name": "combinedRandomness",
+        "type": "bytes32"
+      }
+    ],
+    "stateMutability": "pure",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "bytes32",
+        "name": "userRandomness",
+        "type": "bytes32"
+      }
+    ],
+    "name": "constructUserCommitment",
+    "outputs": [
+      {
+        "internalType": "bytes32",
+        "name": "userCommitment",
+        "type": "bytes32"
+      }
+    ],
+    "stateMutability": "pure",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "getAccruedPythFees",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "accruedPythFeesInWei",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "provider",
+        "type": "address"
+      }
+    ],
+    "name": "getFee",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "feeAmount",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "provider",
+        "type": "address"
+      }
+    ],
+    "name": "getProviderInfo",
+    "outputs": [
+      {
+        "components": [
+          {
+            "internalType": "uint256",
+            "name": "feeInWei",
+            "type": "uint256"
+          },
+          {
+            "internalType": "uint256",
+            "name": "accruedFeesInWei",
+            "type": "uint256"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "originalCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "originalCommitmentSequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "commitmentMetadata",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "endSequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "uint64",
+            "name": "sequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "currentCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "currentCommitmentSequenceNumber",
+            "type": "uint64"
+          }
+        ],
+        "internalType": "struct PythRandomStructs.ProviderInfo",
+        "name": "info",
+        "type": "tuple"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "provider",
+        "type": "address"
+      },
+      {
+        "internalType": "uint64",
+        "name": "sequenceNumber",
+        "type": "uint64"
+      }
+    ],
+    "name": "getRequest",
+    "outputs": [
+      {
+        "components": [
+          {
+            "internalType": "address",
+            "name": "provider",
+            "type": "address"
+          },
+          {
+            "internalType": "uint64",
+            "name": "sequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "userCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "providerCommitment",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint64",
+            "name": "providerCommitmentSequenceNumber",
+            "type": "uint64"
+          },
+          {
+            "internalType": "bytes32",
+            "name": "providerCommitmentMetadata",
+            "type": "bytes32"
+          },
+          {
+            "internalType": "uint256",
+            "name": "blockNumber",
+            "type": "uint256"
+          }
+        ],
+        "internalType": "struct PythRandomStructs.Request",
+        "name": "req",
+        "type": "tuple"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "uint256",
+        "name": "feeInWei",
+        "type": "uint256"
+      },
+      {
+        "internalType": "bytes32",
+        "name": "commitment",
+        "type": "bytes32"
+      },
+      {
+        "internalType": "bytes32",
+        "name": "commitmentMetadata",
+        "type": "bytes32"
+      },
+      {
+        "internalType": "uint64",
+        "name": "chainLength",
+        "type": "uint64"
+      }
+    ],
+    "name": "register",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "provider",
+        "type": "address"
+      },
+      {
+        "internalType": "bytes32",
+        "name": "userCommitment",
+        "type": "bytes32"
+      },
+      {
+        "internalType": "bool",
+        "name": "useBlockHash",
+        "type": "bool"
+      }
+    ],
+    "name": "request",
+    "outputs": [
+      {
+        "internalType": "uint64",
+        "name": "assignedSequenceNumber",
+        "type": "uint64"
+      }
+    ],
+    "stateMutability": "payable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "provider",
+        "type": "address"
+      },
+      {
+        "internalType": "uint64",
+        "name": "sequenceNumber",
+        "type": "uint64"
+      },
+      {
+        "internalType": "bytes32",
+        "name": "userRandomness",
+        "type": "bytes32"
+      },
+      {
+        "internalType": "bytes32",
+        "name": "providerRevelation",
+        "type": "bytes32"
+      }
+    ],
+    "name": "reveal",
+    "outputs": [
+      {
+        "internalType": "bytes32",
+        "name": "randomNumber",
+        "type": "bytes32"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      }
+    ],
+    "name": "withdraw",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  }
+]

pyth-rng/src/api.rs

@@ -0,0 +1,74 @@
+use {
+    crate::{
+        ethereum::PythContract,
+        state::HashChainState,
+    },
+    axum::{
+        http::StatusCode,
+        response::{
+            IntoResponse,
+            Response,
+        },
+    },
+    ethers::core::types::Address,
+    std::sync::Arc,
+};
+pub use {
+    index::*,
+    revelation::*,
+};
+
+mod index;
+mod revelation;
+
+/// The state of the randomness service for a single blockchain.
+#[derive(Clone)]
+pub struct ApiState {
+    /// The hash chain(s) required to serve random numbers for this blockchain
+    pub state:            Arc<HashChainState>,
+    /// The EVM contract where the protocol is running.
+    pub contract:         Arc<PythContract>,
+    /// The EVM address of the provider that this server is operating for.
+    pub provider_address: Address,
+}
+
+
+pub enum RestError {
+    /// The caller passed a sequence number that isn't within the supported range
+    InvalidSequenceNumber,
+    /// The caller requested a random value that can't currently be revealed (because it
+    /// hasn't been committed to on-chain)
+    NoPendingRequest,
+    /// The server cannot currently communicate with the blockchain, so is not able to verify
+    /// which random values have been requested.
+    TemporarilyUnavailable,
+    /// A catch-all error for all other types of errors that could occur during processing.
+    Unknown,
+}
+
+impl IntoResponse for RestError {
+    fn into_response(self) -> Response {
+        match self {
+            RestError::InvalidSequenceNumber => (
+                StatusCode::BAD_REQUEST,
+                "The sequence number is out of the permitted range",
+            )
+                .into_response(),
+            RestError::NoPendingRequest => (
+                StatusCode::FORBIDDEN,
+                "The random value cannot currently be retrieved",
+            )
+                .into_response(),
+            RestError::TemporarilyUnavailable => (
+                StatusCode::SERVICE_UNAVAILABLE,
+                "This service is temporarily unavailable",
+            )
+                .into_response(),
+            RestError::Unknown => (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "An unknown error occurred processing the request",
+            )
+                .into_response(),
+        }
+    }
+}

pyth-rng/src/api/index.rs

@@ -0,0 +1,11 @@
+use axum::{
+    response::IntoResponse,
+    Json,
+};
+
+/// This is the index page for the REST service. It lists all the available endpoints.
+///
+/// TODO: Dynamically generate this list if possible.
+pub async fn index() -> impl IntoResponse {
+    Json(["/v1/revelation"])
+}

pyth-rng/src/api/revelation.rs

@@ -0,0 +1,73 @@
+use {
+    crate::api::RestError,
+    anyhow::Result,
+    axum::{
+        extract::State,
+        Json,
+    },
+    pythnet_sdk::wire::array,
+    serde_qs::axum::QsQuery,
+    utoipa::{
+        IntoParams,
+        ToSchema,
+    },
+};
+
+// TODO: this should probably take path parameters /v1/revelation/<chain_id>/<sequence_number>
+/// Reveal the random value for a given sequence number.
+///
+/// Given a sequence number, retrieve the corresponding random value that this provider has committed to.
+/// This endpoint will not return the random value unless someone has requested the sequence number on-chain.
+#[utoipa::path(
+get,
+path = "/v1/revelation",
+responses(
+(status = 200, description = "Random value successfully retrieved", body = GetRandomValueResponse),
+(status = 403, description = "Random value cannot currently be retrieved", body = String)
+),
+params(
+GetRandomValueQueryParams
+)
+)]
+pub async fn revelation(
+    State(state): State<crate::api::ApiState>,
+    QsQuery(params): QsQuery<GetRandomValueQueryParams>,
+) -> Result<Json<GetRandomValueResponse>, RestError> {
+    let sequence: u64 = params
+        .sequence
+        .try_into()
+        .map_err(|_| RestError::InvalidSequenceNumber)?;
+
+    let r = state
+        .contract
+        .get_request(state.provider_address, sequence)
+        .call()
+        .await
+        .map_err(|_| RestError::TemporarilyUnavailable)?;
+
+    // sequence_number == 0 means the request does not exist.
+    if r.sequence_number != 0 {
+        let value = &state
+            .state
+            .reveal(sequence)
+            .map_err(|_| RestError::Unknown)?;
+        Ok(Json(GetRandomValueResponse {
+            value: (*value).clone(),
+        }))
+    } else {
+        Err(RestError::NoPendingRequest)
+    }
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize, IntoParams)]
+#[into_params(parameter_in=Query)]
+pub struct GetRandomValueQueryParams {
+    pub sequence: u64,
+}
+
+#[derive(Debug, serde::Serialize, serde::Deserialize, ToSchema)]
+pub struct GetRandomValueResponse {
+    // TODO: choose serialization format
+    #[serde(with = "array")]
+    pub value: [u8; 32],
+}

pyth-rng/src/command.rs

@@ -0,0 +1,13 @@
+mod generate;
+mod get_request;
+mod register_provider;
+mod request_randomness;
+mod run;
+
+pub use {
+    generate::generate,
+    get_request::get_request,
+    register_provider::register_provider,
+    request_randomness::request_randomness,
+    run::run,
+};

pyth-rng/src/command/generate.rs

@@ -0,0 +1,60 @@
+use {
+    crate::{
+        api::GetRandomValueResponse,
+        config::GenerateOptions,
+        ethereum::PythContract,
+    },
+    std::{
+        error::Error,
+        sync::Arc,
+    },
+};
+
+/// Run the entire random number generation protocol to produce a random number.
+pub async fn generate(opts: &GenerateOptions) -> Result<(), Box<dyn Error>> {
+    let contract = Arc::new(PythContract::from_opts(&opts.ethereum).await?);
+
+    let user_randomness = rand::random::<[u8; 32]>();
+    let provider = opts.provider;
+
+    // Request a random number on the contract
+    let sequence_number = contract
+        .request_wrapper(&provider, &user_randomness, opts.blockhash)
+        .await?;
+    println!(
+        "Requested the random number with sequence number {:#?}",
+        sequence_number
+    );
+
+    // Get the committed value from the provider
+    let client = reqwest::Client::new();
+    let request_url = client
+        .get(opts.url.join("/v1/revelation")?)
+        .query(&[("sequence", sequence_number)])
+        .build()?;
+    let resp = client
+        .execute(request_url)
+        .await?
+        .json::<GetRandomValueResponse>()
+        .await?;
+
+    println!(
+        "Retrieved the provider's random value. Server response: {:#?}",
+        resp
+    );
+    let provider_randomness = resp.value;
+
+    // Submit the provider's and our values to the contract to reveal the random number.
+    let random_value = contract
+        .reveal_wrapper(
+            &provider,
+            sequence_number,
+            &user_randomness,
+            &provider_randomness,
+        )
+        .await?;
+
+    println!("Generated random number: {:#?}", random_value);
+
+    Ok(())
+}

pyth-rng/src/command/get_request.rs

@@ -0,0 +1,24 @@
+use {
+    crate::{
+        config::GetRequestOptions,
+        ethereum::PythContract,
+    },
+    std::{
+        error::Error,
+        sync::Arc,
+    },
+};
+
+/// Get the on-chain request metadata for a provider and sequence number.
+pub async fn get_request(opts: &GetRequestOptions) -> Result<(), Box<dyn Error>> {
+    // Initialize a Provider to interface with the EVM contract.
+    let contract = Arc::new(PythContract::from_opts(&opts.ethereum).await?);
+
+    let r = contract
+        .get_request(opts.provider, opts.sequence)
+        .call()
+        .await?;
+    println!("Found request: {:?}", r);
+
+    Ok(())
+}

pyth-rng/src/command/register_provider.rs

@@ -0,0 +1,46 @@
+use {
+    crate::{
+        config::RegisterProviderOptions,
+        ethereum::PythContract,
+        state::PebbleHashChain,
+    },
+    std::{
+        error::Error,
+        sync::Arc,
+    },
+};
+
+/// Register as a randomness provider. This method will generate and commit to a new random
+/// hash chain from the configured secret & a newly generated random value.
+pub async fn register_provider(opts: &RegisterProviderOptions) -> Result<(), Box<dyn Error>> {
+    // Initialize a Provider to interface with the EVM contract.
+    let contract = Arc::new(PythContract::from_opts(&opts.ethereum).await?);
+
+    // Create a new random hash chain.
+    let random = rand::random::<[u8; 32]>();
+    let mut chain = PebbleHashChain::from_config(&opts.randomness, random)?;
+
+    // Arguments to the contract to register our new provider.
+    let fee_in_wei = opts.fee;
+    let commitment = chain.reveal()?;
+    // Store the random seed in the metadata field so that we can regenerate the hash chain
+    // at-will. (This is secure because you can't generate the chain unless you also have the secret)
+    let commitment_metadata = random;
+    let commitment_length = opts.randomness.chain_length;
+
+    if let Some(r) = contract
+        .register(
+            fee_in_wei,
+            commitment,
+            commitment_metadata,
+            commitment_length,
+        )
+        .send()
+        .await?
+        .await?
+    {
+        println!("Registered provider: {:?}", r);
+    }
+
+    Ok(())
+}

pyth-rng/src/command/request_randomness.rs

@@ -0,0 +1,23 @@
+use {
+    crate::{
+        config::RequestRandomnessOptions,
+        ethereum::PythContract,
+    },
+    std::{
+        error::Error,
+        sync::Arc,
+    },
+};
+
+pub async fn request_randomness(opts: &RequestRandomnessOptions) -> Result<(), Box<dyn Error>> {
+    let contract = Arc::new(PythContract::from_opts(&opts.ethereum).await?);
+
+    let user_randomness = rand::random::<[u8; 32]>();
+    let sequence_number = contract
+        .request_wrapper(&opts.provider, &user_randomness, false)
+        .await?;
+
+    println!("sequence number: {:#?}", sequence_number);
+
+    Ok(())
+}

pyth-rng/src/command/run.rs

@@ -0,0 +1,95 @@
+use {
+    crate::{
+        api,
+        config::RunOptions,
+        ethereum::PythContract,
+        state::{
+            HashChainState,
+            PebbleHashChain,
+        },
+    },
+    anyhow::{
+        anyhow,
+        Result,
+    },
+    axum::{
+        routing::get,
+        Router,
+    },
+    std::{
+        error::Error,
+        sync::Arc,
+    },
+    tower_http::cors::CorsLayer,
+    utoipa::OpenApi,
+    utoipa_swagger_ui::SwaggerUi,
+};
+
+pub async fn run(opts: &RunOptions) -> Result<(), Box<dyn Error>> {
+    #[derive(OpenApi)]
+    #[openapi(
+    paths(
+    crate::api::revelation,
+    ),
+    components(
+    schemas(
+    crate::api::GetRandomValueResponse
+    )
+    ),
+    tags(
+    (name = "pyth-rng", description = "Pyth Random Number Service")
+    )
+    )]
+    struct ApiDoc;
+
+    let contract = Arc::new(PythContract::from_opts(&opts.ethereum).await?);
+    let provider_info = contract.get_provider_info(opts.provider).call().await?;
+
+    // Reconstruct the hash chain based on the metadata and check that it matches the on-chain commitment.
+    // TODO: we should instantiate the state here with multiple hash chains.
+    // This approach works fine as long as we haven't rotated the commitment (i.e., all user requests
+    // are for the most recent chain).
+    let random: [u8; 32] = provider_info.commitment_metadata;
+    let chain = PebbleHashChain::from_config(&opts.randomness, random)?;
+    let chain_state = HashChainState {
+        offsets:     vec![provider_info
+            .original_commitment_sequence_number
+            .try_into()?],
+        hash_chains: vec![chain],
+    };
+
+    if chain_state.reveal(provider_info.original_commitment_sequence_number)?
+        != provider_info.original_commitment
+    {
+        return Err(anyhow!("The root of the generated hash chain does not match the commitment. Is the secret configured correctly?").into());
+    } else {
+        println!("Root of chain matches commitment");
+    }
+
+    let state = api::ApiState {
+        state: Arc::new(chain_state),
+        contract,
+        provider_address: opts.provider,
+    };
+
+    // Initialize Axum Router. Note the type here is a `Router<State>` due to the use of the
+    // `with_state` method which replaces `Body` with `State` in the type signature.
+    let app = Router::new();
+    let app = app
+        .merge(SwaggerUi::new("/docs").url("/docs/openapi.json", ApiDoc::openapi()))
+        .route("/", get(api::index))
+        .route("/v1/revelation", get(api::revelation))
+        .with_state(state.clone())
+        // Permissive CORS layer to allow all origins
+        .layer(CorsLayer::permissive());
+
+
+    println!("Starting server on: {:?}", &opts.addr);
+    // Binds the axum's server to the configured address and port. This is a blocking call and will
+    // not return until the server is shutdown.
+    axum::Server::try_bind(&opts.addr)?
+        .serve(app.into_make_service())
+        .await?;
+
+    Ok(())
+}

pyth-rng/src/config.rs

@@ -0,0 +1,92 @@
+use {
+    clap::{
+        crate_authors,
+        crate_description,
+        crate_name,
+        crate_version,
+        Args,
+        Parser,
+    },
+    ethers::types::Address,
+};
+
+
+mod generate;
+mod get_request;
+mod register_provider;
+mod request_randomness;
+mod run;
+
+pub use {
+    generate::GenerateOptions,
+    get_request::GetRequestOptions,
+    register_provider::RegisterProviderOptions,
+    request_randomness::RequestRandomnessOptions,
+    run::RunOptions,
+};
+
+const DEFAULT_RPC_ADDR: &str = "127.0.0.1:34000";
+const DEFAULT_HTTP_ADDR: &str = "http://127.0.0.1:34000";
+
+#[derive(Parser, Debug)]
+#[command(name = crate_name!())]
+#[command(author = crate_authors!())]
+#[command(about = crate_description!())]
+#[command(version = crate_version!())]
+#[allow(clippy::large_enum_variant)]
+pub enum Options {
+    /// Run the Randomness Service.
+    Run(run::RunOptions),
+
+    /// Register a new provider with the Pyth Random oracle.
+    RegisterProvider(RegisterProviderOptions),
+
+    /// Request a random number from the contract.
+    RequestRandomness(RequestRandomnessOptions),
+
+    /// Generate a random number by running the entire protocol end-to-end
+    Generate(GenerateOptions),
+
+    GetRequest(GetRequestOptions),
+}
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Ethereum Options")]
+#[group(id = "Ethereum")]
+pub struct EthereumOptions {
+    /// A 20-byte (40 char) hex encoded Ethereum private key.
+    /// This key is required to submit transactions (such as registering with the contract).
+    #[arg(long = "private-key")]
+    #[arg(env = "PRIVATE_KEY")]
+    #[arg(default_value = None)]
+    pub private_key: Option<String>,
+
+    /// URL of a Geth RPC endpoint to use for interacting with the blockchain.
+    #[arg(long = "geth-rpc-addr")]
+    #[arg(env = "GETH_RPC_ADDR")]
+    #[arg(default_value = "https://goerli.optimism.io")]
+    pub geth_rpc_addr: String,
+
+    /// Address of a Pyth Randomness contract to interact with.
+    #[arg(long = "pyth-contract-addr")]
+    #[arg(env = "PYTH_CONTRACT_ADDR")]
+    #[arg(default_value = "0x28F16Af4D87523910b843a801454AEde5F9B0459")]
+    pub contract_addr: Address,
+}
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Randomness Options")]
+#[group(id = "Randomness")]
+pub struct RandomnessOptions {
+    /// A secret used for generating new hash chains. A 64-char hex string.
+    #[arg(long = "secret")]
+    #[arg(env = "PYTH_SECRET")]
+    #[arg(default_value = "0000000000000000000000000000000000000000000000000000000000000000")]
+    pub secret: String,
+
+    /// The length of the hash chain to generate.
+    #[arg(long = "chain-length")]
+    #[arg(env = "PYTH_CHAIN_LENGTH")]
+    #[arg(default_value = "32")]
+    pub chain_length: u64,
+}

pyth-rng/src/config/generate.rs

@@ -0,0 +1,26 @@
+use {
+    crate::config::EthereumOptions,
+    clap::Args,
+    ethers::types::Address,
+    reqwest::Url,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Generate Options")]
+#[group(id = "Generate")]
+pub struct GenerateOptions {
+    #[command(flatten)]
+    pub ethereum: EthereumOptions,
+
+    /// Submit a randomness request to this provider
+    #[arg(long = "provider")]
+    #[arg(default_value = "0x368397bDc956b4F23847bE244f350Bde4615F25E")]
+    pub provider: Address,
+
+    #[arg(long = "url")]
+    #[arg(default_value = super::DEFAULT_HTTP_ADDR)]
+    pub url: Url,
+
+    #[arg(short = 'b')]
+    pub blockhash: bool,
+}

pyth-rng/src/config/get_request.rs

@@ -0,0 +1,25 @@
+use {
+    crate::config::EthereumOptions,
+    clap::Args,
+    ethers::types::Address,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Get Request Options")]
+#[group(id = "GetRequest")]
+pub struct GetRequestOptions {
+    #[command(flatten)]
+    pub ethereum: EthereumOptions,
+
+    /// Retrieve a randomness request to this provider
+    #[arg(long = "provider")]
+    #[arg(env = "PYTH_PROVIDER")]
+    #[arg(default_value = "0x368397bDc956b4F23847bE244f350Bde4615F25E")]
+    pub provider: Address,
+
+    /// The sequence number of the request to retrieve
+    #[arg(long = "sequence")]
+    #[arg(env = "PYTH_SEQUENCE")]
+    #[arg(default_value = "0")]
+    pub sequence: u64,
+}

pyth-rng/src/config/register_provider.rs

@@ -0,0 +1,24 @@
+use {
+    crate::config::{
+        EthereumOptions,
+        RandomnessOptions,
+    },
+    clap::Args,
+    ethers::types::U256,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Register Provider Options")]
+#[group(id = "RegisterProvider")]
+pub struct RegisterProviderOptions {
+    #[command(flatten)]
+    pub ethereum: EthereumOptions,
+
+    #[command(flatten)]
+    pub randomness: RandomnessOptions,
+
+    /// The fee to charge (in wei) for each requested random number
+    #[arg(long = "pyth-contract-fee")]
+    #[arg(default_value = "100")]
+    pub fee: U256,
+}

pyth-rng/src/config/request_randomness.rs

@@ -0,0 +1,25 @@
+use {
+    crate::config::{
+        EthereumOptions,
+        RandomnessOptions,
+    },
+    clap::Args,
+    ethers::types::Address,
+};
+
+#[derive(Args, Clone, Debug)]
+#[command(next_help_heading = "Request Randomness Options")]
+#[group(id = "RequestRandomness")]
+pub struct RequestRandomnessOptions {
+    #[command(flatten)]
+    pub ethereum: EthereumOptions,
+
+    #[command(flatten)]
+    pub randomness: RandomnessOptions,
+
+    /// Submit a randomness request to this provider
+    #[arg(long = "provider")]
+    #[arg(env = "PYTH_PROVIDER")]
+    #[arg(default_value = "0x368397bDc956b4F23847bE244f350Bde4615F25E")]
+    pub provider: Address,
+}

pyth-rng/src/config/run.rs

@@ -0,0 +1,31 @@
+use {
+    crate::config::{
+        EthereumOptions,
+        RandomnessOptions,
+    },
+    clap::Args,
+    ethers::types::Address,
+    std::net::SocketAddr,
+};
+
+/// Run the webservice
+#[derive(Args, Clone, Debug)]
+pub struct RunOptions {
+    #[command(flatten)]
+    pub ethereum: EthereumOptions,
+
+    #[command(flatten)]
+    pub randomness: RandomnessOptions,
+
+    /// Address and port the HTTP server will bind to.
+    #[arg(long = "rpc-listen-addr")]
+    #[arg(default_value = super::DEFAULT_RPC_ADDR)]
+    #[arg(env = "RPC_ADDR")]
+    pub addr: SocketAddr,
+
+    /// The public key of the provider whose requests the server will respond to.
+    #[arg(long = "provider")]
+    #[arg(env = "PYTH_PROVIDER")]
+    #[arg(default_value = "0x368397bDc956b4F23847bE244f350Bde4615F25E")]
+    pub provider: Address,
+}

pyth-rng/src/ethereum.rs

@@ -0,0 +1,123 @@
+use {
+    crate::config::EthereumOptions,
+    anyhow::anyhow,
+    ethers::{
+        abi::RawLog,
+        contract::{
+            abigen,
+            EthLogDecode,
+        },
+        core::types::Address,
+        middleware::SignerMiddleware,
+        providers::{
+            Http,
+            Middleware,
+            Provider,
+        },
+        signers::{
+            LocalWallet,
+            Signer,
+        },
+    },
+    sha3::{
+        Digest,
+        Keccak256,
+    },
+    std::{
+        error::Error,
+        sync::Arc,
+    },
+};
+
+// TODO: Programatically generate this so we don't have to keep committed ABI in sync with the
+// contract in the same repo.
+abigen!(PythRandom, "src/abi.json");
+
+pub type PythContract = PythRandom<SignerMiddleware<Provider<Http>, LocalWallet>>;
+
+impl PythContract {
+    // TODO: this method requires a private key to instantiate the contract. This key
+    // shouldn't be required for read-only uses (e.g., when the server is running).
+    pub async fn from_opts(opts: &EthereumOptions) -> Result<PythContract, Box<dyn Error>> {
+        let provider = Provider::<Http>::try_from(&opts.geth_rpc_addr)?;
+        let chain_id = provider.get_chainid().await?;
+        let wallet__ = opts
+            .private_key
+            .clone()
+            .ok_or(anyhow!("No private key specified"))?
+            .parse::<LocalWallet>()?
+            .with_chain_id(chain_id.as_u64());
+
+        Ok(PythRandom::new(
+            opts.contract_addr,
+            Arc::new(SignerMiddleware::new(provider, wallet__)),
+        ))
+    }
+
+    /// Submit a request for a random number to the contract.
+    ///
+    /// This method is a version of the autogenned `request` method that parses the emitted logs
+    /// to return the sequence number of the created Request.
+    pub async fn request_wrapper(
+        &self,
+        provider: &Address,
+        user_randomness: &[u8; 32],
+        use_blockhash: bool,
+    ) -> Result<u64, Box<dyn Error>> {
+        let fee = self.get_fee(*provider).call().await?;
+
+        let hashed_randomness: [u8; 32] = Keccak256::digest(user_randomness).into();
+
+        if let Some(r) = self
+            .request(*provider, hashed_randomness, use_blockhash)
+            .value(fee)
+            .send()
+            .await?
+            .await?
+        {
+            // Extract Log from TransactionReceipt.
+            let l: RawLog = r.logs[0].clone().into();
+            if let PythRandomEvents::RequestedFilter(r) = PythRandomEvents::decode_log(&l)? {
+                Ok(r.request.sequence_number)
+            } else {
+                Err(anyhow!("No log with sequence number").into())
+            }
+        } else {
+            Err(anyhow!("Request failed").into())
+        }
+    }
+
+    /// Reveal the generated random number to the contract.
+    ///
+    /// This method is a version of the autogenned `reveal` method that parses the emitted logs
+    /// to return the generated random number.
+    pub async fn reveal_wrapper(
+        &self,
+        provider: &Address,
+        sequence_number: u64,
+        user_randomness: &[u8; 32],
+        provider_randomness: &[u8; 32],
+    ) -> Result<[u8; 32], Box<dyn Error>> {
+        if let Some(r) = self
+            .reveal(
+                *provider,
+                sequence_number,
+                *user_randomness,
+                *provider_randomness,
+            )
+            .send()
+            .await?
+            .await?
+        {
+            if let PythRandomEvents::RevealedFilter(r) =
+                PythRandomEvents::decode_log(&r.logs[0].clone().into())?
+            {
+                Ok(r.random_number)
+            } else {
+                Err(anyhow!("No log with randomnumber").into())
+            }
+        } else {
+            Err(anyhow!("Request failed").into())
+        }
+    }
+}

pyth-rng/src/main.rs

@@ -0,0 +1,25 @@
+#![allow(clippy::just_underscores_and_digits)]
+#![feature(slice_flatten)]
+
+use {
+    anyhow::Result,
+    clap::Parser,
+    std::error::Error,
+};
+
+pub mod api;
+pub mod command;
+pub mod config;
+pub mod ethereum;
+pub mod state;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    match config::Options::parse() {
+        config::Options::GetRequest(opts) => command::get_request(&opts).await,
+        config::Options::Generate(opts) => command::generate(&opts).await,
+        config::Options::Run(opts) => command::run(&opts).await,
+        config::Options::RegisterProvider(opts) => command::register_provider(&opts).await,
+        config::Options::RequestRandomness(opts) => command::request_randomness(&opts).await,
+    }
+}

pyth-rng/src/state.rs

@@ -0,0 +1,77 @@
+use {
+    crate::config::RandomnessOptions,
+    anyhow::{
+        ensure,
+        Result,
+    },
+    sha3::{
+        Digest,
+        Keccak256,
+    },
+    std::error::Error,
+};
+
+/// A HashChain.
+pub struct PebbleHashChain {
+    hash: Vec<[u8; 32]>,
+    next: usize,
+}
+
+impl PebbleHashChain {
+    // Given a secret, we hash it with Keccak256 len times to get the final hash, this is an S/KEY
+    // like protocol in which revealing the hashes in reverse proves knowledge.
+    pub fn new(secret: [u8; 32], length: usize) -> Self {
+        let mut hash = Vec::<[u8; 32]>::with_capacity(length);
+        hash.push(Keccak256::digest(secret).into());
+        for _ in 1..length {
+            hash.push(Keccak256::digest(&hash[hash.len() - 1]).into());
+        }
+
+        hash.reverse();
+
+        Self { hash, next: 0 }
+    }
+
+    // TODO: possibly take the chain id here to ensure different hash chains on every blockchain
+    pub fn from_config(opts: &RandomnessOptions, random: [u8; 32]) -> Result<Self, Box<dyn Error>> {
+        let mut secret: [u8; 32] = [0u8; 32];
+        secret.copy_from_slice(&hex::decode(opts.secret.clone())?[0..32]);
+        let secret: [u8; 32] = Keccak256::digest([random, secret].flatten()).into();
+
+        Ok(Self::new(secret, opts.chain_length.try_into()?))
+    }
+
+    /// Reveal the next hash in the chain using the previous proof.
+    pub fn reveal(&mut self) -> Result<[u8; 32]> {
+        ensure!(self.next < self.len(), "no more hashes in the chain");
+        let next = self.hash[self.next].clone();
+        self.next += 1;
+        Ok(next)
+    }
+
+    pub fn reveal_ith(&self, i: usize) -> Result<[u8; 32]> {
+        ensure!(i < self.len(), "index not in range");
+        Ok(self.hash[i].clone())
+    }
+
+    pub fn len(&self) -> usize {
+        self.hash.len()
+    }
+}
+
+/// `HashChainState` tracks the mapping between on-chain sequence numbers to hash chains.
+/// This struct is required to handle the case where the provider rotates their commitment,
+/// which requires tracking multiple hash chains here.
+pub struct HashChainState {
+    // The sequence number where the hash chain starts. Must be stored in sorted order.
+    pub offsets:     Vec<usize>,
+    pub hash_chains: Vec<PebbleHashChain>,
+}
+
+impl HashChainState {
+    pub fn reveal(&self, sequence_number: u64) -> Result<[u8; 32]> {
+        let sequence_number: usize = sequence_number.try_into()?;
+        let chain_index = self.offsets.partition_point(|x| x <= &sequence_number) - 1;
+        self.hash_chains[chain_index].reveal_ith(sequence_number - self.offsets[chain_index])
+    }
+}