feat(config): Allow to add keys to be scanned by the zebra-scan crate to config (#7949)

* allow user to add sapling keys to config

* apply code review suggestions

Co-authored-by: teor <teor@riseup.net>

---------

Co-authored-by: teor <teor@riseup.net>

Cargo.lock

@@ -5780,8 +5780,10 @@ dependencies = [
  "color-eyre",
  "ff",
  "group",
+ "indexmap 2.1.0",
  "jubjub",
  "rand 0.8.5",
+ "serde",
  "tokio",
  "zcash_client_backend",
  "zcash_note_encryption",
@@ -5959,6 +5961,7 @@ dependencies = [
  "zebra-network",
  "zebra-node-services",
  "zebra-rpc",
+ "zebra-scan",
  "zebra-state",
  "zebra-test",
  "zebra-utils",

zebra-scan/Cargo.toml

@@ -21,6 +21,9 @@ categories = ["cryptography::cryptocurrencies"]
 [dependencies]
 zebra-chain = { path = "../zebra-chain", version = "1.0.0-beta.31" }
 
+indexmap = { version = "2.0.1", features = ["serde"] }
+serde = { version = "1.0.192", features = ["serde_derive"] }
+
 [dev-dependencies]
 
 zcash_client_backend = "0.10.0-rc.1"

zebra-scan/src/config.rs

@@ -0,0 +1,23 @@
+//! Configuration for blockchain scanning tasks.
+
+use indexmap::IndexMap;
+use serde::{Deserialize, Serialize};
+
+use crate::storage::SaplingScanningKey;
+
+#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
+#[serde(deny_unknown_fields, default)]
+/// Configuration for scanning.
+pub struct Config {
+    /// The sapling keys to scan for and the birthday height of each of them.
+    // TODO: any value below sapling activation as the birthday height should default to sapling activation.
+    pub sapling_keys_to_scan: IndexMap<SaplingScanningKey, u32>,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            sapling_keys_to_scan: IndexMap::new(),
+        }
+    }
+}

zebra-scan/src/lib.rs

@@ -4,6 +4,7 @@
 #![doc(html_logo_url = "https://zfnd.org/wp-content/uploads/2022/03/zebra-icon.png")]
 #![doc(html_root_url = "https://docs.rs/zebra_scan")]
 
+pub mod config;
 mod storage;
 
 #[cfg(test)]

zebrad/Cargo.toml

@@ -68,6 +68,9 @@ getblocktemplate-rpcs = [
     "zebra-chain/getblocktemplate-rpcs",
 ]
 
+# Experimental shielded blockchain scanning
+shielded-scan = ["zebra-scan"]
+
 # Experimental elasticsearch indexing
 elasticsearch = [
     "zebra-state/elasticsearch",
@@ -152,6 +155,9 @@ zebra-node-services = { path = "../zebra-node-services", version = "1.0.0-beta.3
 zebra-rpc = { path = "../zebra-rpc", version = "1.0.0-beta.31" }
 zebra-state = { path = "../zebra-state", version = "1.0.0-beta.31" }
 
+# Experimental shielded-scan feature
+zebra-scan = { path = "../zebra-scan", version = "0.1.0-alpha.0", optional = true }
+
 # Required for crates.io publishing, but it's only used in tests
 zebra-utils = { path = "../zebra-utils", version = "1.0.0-beta.31", optional = true }
 

zebrad/src/config.rs

@@ -43,4 +43,8 @@ pub struct ZebradConfig {
     #[serde(skip_serializing_if = "zebra_rpc::config::mining::Config::skip_getblocktemplate")]
     /// Mining configuration
     pub mining: zebra_rpc::config::mining::Config,
+
+    #[cfg(feature = "zebra-scan")]
+    /// Scanner configuration
+    pub shielded_scan: zebra_scan::config::Config,
 }