docs(adapter): adds docs to receipt checks adapter

tap_core/src/adapters/receipt_checks_adapter.rs

@@ -1,13 +1,54 @@
 // Copyright 2023-, Semiotic AI, Inc.
 // SPDX-License-Identifier: Apache-2.0
 
+use crate::{eip_712_signed_message::EIP712SignedMessage, tap_receipt::Receipt};
 use ethereum_types::Address;
 
-use crate::{eip_712_signed_message::EIP712SignedMessage, tap_receipt::Receipt};
+/// `ReceiptChecksAdapter` defines a trait for adapters to handle checks related to TAP receipts.
+///
+/// This trait is designed to be implemented by users of this library who want to
+/// customize the checks done on TAP receipts. This includes ensuring the receipt is unique,
+/// verifying the allocation ID, the value and the gateway ID.
+///
+/// # Usage
+///
+/// The `is_unique` method should be used to check if the given receipt is unique in the system.
+///
+/// The `is_valid_allocation_id` method should verify if the allocation ID is valid.
+///
+/// The `is_valid_value` method should confirm the value of the receipt is valid for the given query ID.
+///
+/// The `is_valid_gateway_id` method should confirm the gateway ID is valid.
+///
+/// This trait is utilized by [crate::tap_manager], which relies on these
+/// operations for managing TAP receipts.
+///
+/// # Example
+///
+/// For example code see [crate::adapters::receipt_checks_adapter_mock]
 
 pub trait ReceiptChecksAdapter {
+    /// Checks if the given receipt is unique in the system.
+    ///
+    /// This method should be implemented to verify the uniqueness of a given receipt in your system. Keep in mind that
+    /// the receipt likely will be in storage when this check is performed so the receipt id should be used to check
+    /// for uniqueness.
     fn is_unique(&self, receipt: &EIP712SignedMessage<Receipt>, receipt_id: u64) -> bool;
+
+    /// Verifies if the allocation ID is valid.
+    ///
+    /// This method should be implemented to validate the given allocation ID is a valid allocation for the indexer. Valid is defined as
+    /// an allocation ID that is owned by the indexer and still available for redeeming.
     fn is_valid_allocation_id(&self, allocation_id: Address) -> bool;
+
+    /// Confirms the value of the receipt is valid for the given query ID.
+    ///
+    /// This method should be implemented to confirm the validity of the given value for a specific query ID.
     fn is_valid_value(&self, value: u128, query_id: u64) -> bool;
+
+    /// Confirms the gateway ID is valid.
+    ///
+    /// This method should be implemented to validate the given gateway ID is one associated with a gateway the indexer considers valid.
+    /// The provided gateway ID is the address of the gateway that is recovered from the signature of the receipt.
     fn is_valid_gateway_id(&self, gateway_id: Address) -> bool;
 }