refactor(agent): StateApi -> Prices and refactor module

The StateApi is left over from the initial Adapter, but all functionality is
for pricing/product accounts. This refactors that module and fixes the cyclic
dependency between it and GlobalStore.

The new logic performs updates within the Prices API (Which is where the state
relevant to subscriptions already was, so is the better place for it).

File rename left for a future commit to keep the diffs clean.

src/agent.rs

@@ -146,7 +146,7 @@ impl Agent {
         }
 
         // Create the Notifier task for the Pythd RPC.
-        jhs.push(tokio::spawn(notifier(adapter.clone())));
+        jhs.push(tokio::spawn(notifier(logger.clone(), adapter.clone())));
 
         // Spawn the Pythd API Server
         jhs.push(tokio::spawn(rpc::run(

src/agent/metrics.rs

@@ -1,22 +1,44 @@
 use {
-    super::state::{local::PriceInfo, State},
-    crate::agent::{solana::oracle::PriceEntry, store::PriceIdentifier},
+    super::state::{
+        local::PriceInfo,
+        State,
+    },
+    crate::agent::{
+        solana::oracle::PriceEntry,
+        store::PriceIdentifier,
+    },
     lazy_static::lazy_static,
     prometheus_client::{
-        encoding::{text::encode, EncodeLabelSet},
-        metrics::{counter::Counter, family::Family, gauge::Gauge},
+        encoding::{
+            text::encode,
+            EncodeLabelSet,
+        },
+        metrics::{
+            counter::Counter,
+            family::Family,
+            gauge::Gauge,
+        },
         registry::Registry,
     },
     serde::Deserialize,
     slog::Logger,
     solana_sdk::pubkey::Pubkey,
     std::{
         net::SocketAddr,
-        sync::{atomic::AtomicU64, Arc},
+        sync::{
+            atomic::AtomicU64,
+            Arc,
+        },
         time::Instant,
     },
     tokio::sync::Mutex,
-    warp::{hyper::StatusCode, reply, Filter, Rejection, Reply},
+    warp::{
+        hyper::StatusCode,
+        reply,
+        Filter,
+        Rejection,
+        Reply,
+    },
 };
 
 pub fn default_bind_address() -> SocketAddr {
@@ -46,8 +68,8 @@ lazy_static! {
 /// metrics.
 pub struct MetricsServer {
     pub start_time: Instant,
-    pub logger: Logger,
-    pub adapter: Arc<State>,
+    pub logger:     Logger,
+    pub adapter:    Arc<State>,
 }
 
 impl MetricsServer {
@@ -151,12 +173,12 @@ pub struct PriceGlobalMetrics {
 
     /// f64 is used to get u64 support. Official docs:
     /// https://docs.rs/prometheus-client/latest/prometheus_client/metrics/gauge/struct.Gauge.html#using-atomicu64-as-storage-and-f64-on-the-interface
-    conf: Family<PriceGlobalLabels, Gauge<f64, AtomicU64>>,
+    conf:      Family<PriceGlobalLabels, Gauge<f64, AtomicU64>>,
     timestamp: Family<PriceGlobalLabels, Gauge>,
 
     /// Note: the exponent is not applied to this metric
-    prev_price: Family<PriceGlobalLabels, Gauge>,
-    prev_conf: Family<PriceGlobalLabels, Gauge<f64, AtomicU64>>,
+    prev_price:     Family<PriceGlobalLabels, Gauge>,
+    prev_conf:      Family<PriceGlobalLabels, Gauge<f64, AtomicU64>>,
     prev_timestamp: Family<PriceGlobalLabels, Gauge>,
 
     /// How many times this Price was updated in the global store
@@ -299,10 +321,10 @@ pub struct PriceLocalLabels {
 /// Metrics exposed to Prometheus by the local store for each price
 #[derive(Default)]
 pub struct PriceLocalMetrics {
-    price: Family<PriceLocalLabels, Gauge>,
+    price:     Family<PriceLocalLabels, Gauge>,
     /// f64 is used to get u64 support. Official docs:
     /// https://docs.rs/prometheus-client/latest/prometheus_client/metrics/gauge/struct.Gauge.html#using-atomicu64-as-storage-and-f64-on-the-interface
-    conf: Family<PriceLocalLabels, Gauge<f64, AtomicU64>>,
+    conf:      Family<PriceLocalLabels, Gauge<f64, AtomicU64>>,
     timestamp: Family<PriceLocalLabels, Gauge>,
 
     /// How many times this price was updated in the local store

src/agent/pythd/api/rpc.rs

@@ -117,7 +117,7 @@ async fn handle_connection<S>(
     notify_price_sched_tx_buffer: usize,
     logger: Logger,
 ) where
-    S: state::StateApi,
+    S: state::Prices,
     S: Send,
     S: Sync,
     S: 'static,
@@ -165,7 +165,7 @@ async fn handle_next<S>(
     notify_price_sched_rx: &mut mpsc::Receiver<NotifyPriceSched>,
 ) -> Result<()>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     tokio::select! {
         msg = ws_rx.next() => {
@@ -207,7 +207,7 @@ async fn handle<S>(
     msg: Message,
 ) -> Result<()>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     // Ignore control and binary messages
     if !msg.is_text() {
@@ -293,7 +293,7 @@ async fn dispatch_and_catch_error<S>(
     request: &Request<Method, Value>,
 ) -> Response<serde_json::Value>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     debug!(
         logger,
@@ -429,7 +429,7 @@ impl Default for Config {
 
 pub async fn run<S>(config: Config, logger: Logger, adapter: Arc<S>)
 where
-    S: state::StateApi,
+    S: state::Prices,
     S: Send,
     S: Sync,
     S: 'static,
@@ -442,7 +442,7 @@ where
 
 async fn serve<S>(config: Config, logger: &Logger, adapter: Arc<S>) -> Result<()>
 where
-    S: state::StateApi,
+    S: state::Prices,
     S: Send,
     S: Sync,
     S: 'static,

src/agent/pythd/api/rpc/get_all_products.rs

@@ -5,7 +5,7 @@ use {
 
 pub async fn get_all_products<S>(adapter: &S) -> Result<serde_json::Value>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     let products = adapter.get_all_products().await?;
     Ok(serde_json::to_value(products)?)

src/agent/pythd/api/rpc/get_product.rs

@@ -19,7 +19,7 @@ pub async fn get_product<S>(
     request: &Request<Method, Value>,
 ) -> Result<serde_json::Value>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     let params: GetProductParams = {
         let value = request.params.clone();

src/agent/pythd/api/rpc/get_product_list.rs

@@ -5,7 +5,7 @@ use {
 
 pub async fn get_product_list<S>(adapter: &S) -> Result<serde_json::Value>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     let product_list = adapter.get_product_list().await?;
     Ok(serde_json::to_value(product_list)?)

src/agent/pythd/api/rpc/subscribe_price.rs

@@ -23,7 +23,7 @@ pub async fn subscribe_price<S>(
     request: &Request<Method, Value>,
 ) -> Result<serde_json::Value>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     let params: SubscribePriceParams = serde_json::from_value(
         request

src/agent/pythd/api/rpc/subscribe_price_sched.rs

@@ -23,7 +23,7 @@ pub async fn subscribe_price_sched<S>(
     request: &Request<Method, Value>,
 ) -> Result<serde_json::Value>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     let params: SubscribePriceSchedParams = serde_json::from_value(
         request

src/agent/pythd/api/rpc/update_price.rs

@@ -19,7 +19,7 @@ pub async fn update_price<S>(
     request: &Request<Method, Value>,
 ) -> Result<serde_json::Value>
 where
-    S: state::StateApi,
+    S: state::Prices,
 {
     let params: UpdatePriceParams = serde_json::from_value(
         request
@@ -29,7 +29,7 @@ where
     )?;
 
     adapter
-        .update_price(
+        .update_local_price(
             &params.account.parse::<solana_sdk::pubkey::Pubkey>()?,
             params.price,
             params.conf,

src/agent/solana/oracle.rs

@@ -10,10 +10,8 @@ use {
         legacy_schedule::LegacySchedule,
         market_schedule::MarketSchedule,
         state::{
-            global::{
-                GlobalStore,
-                Update,
-            },
+            global::Update,
+            Prices,
             State,
         },
     },
@@ -416,7 +414,7 @@ impl Oracle {
         account_key: &Pubkey,
         account: &ProductEntry,
     ) -> Result<()> {
-        GlobalStore::update(
+        Prices::update_global_price(
             &*self.adapter,
             self.network,
             &Update::ProductAccountUpdate {
@@ -433,7 +431,7 @@ impl Oracle {
         account_key: &Pubkey,
         account: &PriceEntry,
     ) -> Result<()> {
-        GlobalStore::update(
+        Prices::update_global_price(
             &*self.adapter,
             self.network,
             &Update::PriceAccountUpdate {