v0.2.2-pre.005

crates/ksp-onchain-transport-lib/fixtures/http/get_cluster_nodes.invalid_pubkey.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":[{"pubkey":"not-a-pubkey","rpc":"127.0.0.1:8899"}],"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_cluster_nodes.success.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":[{"pubkey":"11111111111111111111111111111111","featureSet":3073396398,"gossip":"127.0.0.1:8001","pubsub":null,"rpc":"127.0.0.1:8899","serveRepair":"127.0.0.1:8004","shredVersion":50093,"tpu":"127.0.0.1:8003","tpuForwards":"127.0.0.1:8004","tpuForwardsQuic":"127.0.0.1:8006","tpuQuic":"127.0.0.1:8009","tpuVote":"127.0.0.1:8005","tvu":"127.0.0.1:8000","version":"4.2.1","clientId":"Agave"},{"pubkey":"Stake11111111111111111111111111111111111111"}],"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_epoch_info.success.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":{"absoluteSlot":430000001,"blockHeight":429900000,"epoch":995,"slotIndex":12345,"slotsInEpoch":432000,"transactionCount":null},"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_epoch_schedule.success.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":{"firstNormalEpoch":0,"firstNormalSlot":0,"leaderScheduleSlotOffset":432000,"slotsPerEpoch":432000,"warmup":false},"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_highest_snapshot_slot.error.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","error":{"code":-32008,"message":"No snapshot"},"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_highest_snapshot_slot.success.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":{"full":429990000,"incremental":null},"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_identity.invalid_pubkey.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":{"identity":"invalid-identity"},"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_identity.success.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":{"identity":"ComputeBudget111111111111111111111111111111"},"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_max_retransmit_slot.success.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":430000010,"id":1}

crates/ksp-onchain-transport-lib/fixtures/http/get_max_shred_insert_slot.success.json

@@ -0,0 +1 @@
+{"jsonrpc":"2.0","result":430000011,"id":1}

crates/ksp-onchain-transport-lib/src/rpc_cluster.rs

@@ -1,5 +1,5 @@
 // file: crates/ksp-onchain-transport-lib/src/rpc_cluster.rs
-// version: 2
+// version: 3
 
 /// Contact information returned for one cluster node.
 #[derive(Clone, Debug, Eq, PartialEq)]
@@ -99,7 +99,6 @@ impl SolanaClusterNode {
     }
 
     /// Decodes one cluster-node contact record from the Solana JSON wire shape.
-    #[cfg(test)]
     pub(crate) fn decode_wire(method: &str, value: serde_json::Value) -> ksp_core_lib::Result<Self> {
         let decoded = crate::decode_wire_json::<WireClusterNode>(method, value);
         let wire = match decoded {
@@ -175,7 +174,6 @@ impl SolanaEpochInfo {
     }
 
     /// Decodes epoch information from the Solana JSON wire shape.
-    #[cfg(test)]
     pub(crate) fn decode_wire(method: &str, value: serde_json::Value) -> ksp_core_lib::Result<Self> {
         let decoded = crate::decode_wire_json::<WireEpochInfo>(method, value);
         return match decoded {
@@ -230,7 +228,6 @@ impl SolanaEpochSchedule {
     }
 
     /// Decodes an epoch schedule from the Solana JSON wire shape.
-    #[cfg(test)]
     pub(crate) fn decode_wire(method: &str, value: serde_json::Value) -> ksp_core_lib::Result<Self> {
         let decoded = crate::decode_wire_json::<WireEpochSchedule>(method, value);
         return match decoded {
@@ -266,7 +263,6 @@ impl SolanaSnapshotSlotInfo {
     }
 
     /// Decodes snapshot-slot information from the Solana JSON wire shape.
-    #[cfg(test)]
     pub(crate) fn decode_wire(method: &str, value: serde_json::Value) -> ksp_core_lib::Result<Self> {
         let decoded = crate::decode_wire_json::<WireSnapshotSlotInfo>(method, value);
         return match decoded {
@@ -617,7 +613,135 @@ impl SolanaVoteAccountStatus {
     }
 }
 
-#[cfg(test)]
+#[derive(serde::Deserialize)]
+struct WireIdentity {
+    identity: std::string::String,
+}
+
+impl crate::HttpTransportPool {
+    /// Executes typed `getClusterNodes` through the common KSP HTTP transport path.
+    pub async fn get_cluster_nodes(&self, role: &crate::HttpRoleName) -> ksp_core_lib::Result<std::vec::Vec<crate::SolanaClusterNode>> {
+        let value = self.execute_cluster_simple_rpc("getClusterNodes", role, std::vec::Vec::new()).await;
+        let value = match value {
+            std::result::Result::Ok(value) => value,
+            std::result::Result::Err(error) => return std::result::Result::Err(error),
+        };
+        let decoded = crate::decode_wire_json::<std::vec::Vec<serde_json::Value>>("getClusterNodes", value);
+        let values = match decoded {
+            std::result::Result::Ok(values) => values,
+            std::result::Result::Err(error) => return std::result::Result::Err(error),
+        };
+        let mut nodes = std::vec::Vec::with_capacity(values.len());
+        for value in values {
+            let node = crate::SolanaClusterNode::decode_wire("getClusterNodes", value);
+            match node {
+                std::result::Result::Ok(node) => nodes.push(node),
+                std::result::Result::Err(error) => return std::result::Result::Err(error),
+            }
+        }
+        return std::result::Result::Ok(nodes);
+    }
+
+    /// Executes typed `getEpochInfo` through the common KSP HTTP transport path.
+    pub async fn get_epoch_info(
+        &self,
+        role: &crate::HttpRoleName,
+        config: std::option::Option<&crate::SolanaContextConfig>,
+    ) -> ksp_core_lib::Result<crate::SolanaEpochInfo> {
+        let mut params = std::vec::Vec::new();
+        if let std::option::Option::Some(config) = config
+            && (config.commitment().is_some() || config.min_context_slot().is_some())
+        {
+            params.push(config.to_json_value());
+        }
+        let value = self.execute_cluster_simple_rpc("getEpochInfo", role, params).await;
+        return match value {
+            std::result::Result::Ok(value) => crate::SolanaEpochInfo::decode_wire("getEpochInfo", value),
+            std::result::Result::Err(error) => std::result::Result::Err(error),
+        };
+    }
+
+    /// Executes typed `getEpochSchedule` through the common KSP HTTP transport path.
+    pub async fn get_epoch_schedule(&self, role: &crate::HttpRoleName) -> ksp_core_lib::Result<crate::SolanaEpochSchedule> {
+        let value = self.execute_cluster_simple_rpc("getEpochSchedule", role, std::vec::Vec::new()).await;
+        return match value {
+            std::result::Result::Ok(value) => crate::SolanaEpochSchedule::decode_wire("getEpochSchedule", value),
+            std::result::Result::Err(error) => std::result::Result::Err(error),
+        };
+    }
+
+    /// Executes typed `getHighestSnapshotSlot` through the common KSP HTTP transport path.
+    pub async fn get_highest_snapshot_slot(&self, role: &crate::HttpRoleName) -> ksp_core_lib::Result<crate::SolanaSnapshotSlotInfo> {
+        let value = self.execute_cluster_simple_rpc("getHighestSnapshotSlot", role, std::vec::Vec::new()).await;
+        return match value {
+            std::result::Result::Ok(value) => crate::SolanaSnapshotSlotInfo::decode_wire("getHighestSnapshotSlot", value),
+            std::result::Result::Err(error) => std::result::Result::Err(error),
+        };
+    }
+
+    /// Executes typed `getIdentity` through the common KSP HTTP transport path.
+    pub async fn get_identity(&self, role: &crate::HttpRoleName) -> ksp_core_lib::Result<ksp_core_lib::Pubkey> {
+        let value = self.execute_cluster_simple_rpc("getIdentity", role, std::vec::Vec::new()).await;
+        let value = match value {
+            std::result::Result::Ok(value) => value,
+            std::result::Result::Err(error) => return std::result::Result::Err(error),
+        };
+        let decoded = crate::decode_wire_json::<WireIdentity>("getIdentity", value);
+        let wire = match decoded {
+            std::result::Result::Ok(wire) => wire,
+            std::result::Result::Err(error) => return std::result::Result::Err(error),
+        };
+        return crate::parse_wire_pubkey("getIdentity", "identity", wire.identity.as_str());
+    }
+
+    /// Executes typed `getMaxRetransmitSlot` through the common KSP HTTP transport path.
+    pub async fn get_max_retransmit_slot(&self, role: &crate::HttpRoleName) -> ksp_core_lib::Result<u64> {
+        return self.get_cluster_simple_slot("getMaxRetransmitSlot", role).await;
+    }
+
+    /// Executes typed `getMaxShredInsertSlot` through the common KSP HTTP transport path.
+    pub async fn get_max_shred_insert_slot(&self, role: &crate::HttpRoleName) -> ksp_core_lib::Result<u64> {
+        return self.get_cluster_simple_slot("getMaxShredInsertSlot", role).await;
+    }
+
+    async fn get_cluster_simple_slot(&self, method_name: &'static str, role: &crate::HttpRoleName) -> ksp_core_lib::Result<u64> {
+        let value = self.execute_cluster_simple_rpc(method_name, role, std::vec::Vec::new()).await;
+        return match value {
+            std::result::Result::Ok(value) => crate::decode_wire_json::<u64>(method_name, value),
+            std::result::Result::Err(error) => std::result::Result::Err(error),
+        };
+    }
+
+    async fn execute_cluster_simple_rpc(
+        &self,
+        method_name: &'static str,
+        role: &crate::HttpRoleName,
+        params: std::vec::Vec<serde_json::Value>,
+    ) -> ksp_core_lib::Result<serde_json::Value> {
+        let method = cluster_descriptor(method_name);
+        let method = match method {
+            std::result::Result::Ok(method) => method,
+            std::result::Result::Err(error) => return std::result::Result::Err(error),
+        };
+        return self.execute_standard_rpc(role, method, params).await;
+    }
+}
+
+fn cluster_descriptor(method: &str) -> ksp_core_lib::Result<&'static crate::HttpRpcMethodDescriptor> {
+    let descriptor = crate::find_http_rpc_method(method);
+    return match descriptor {
+        std::option::Option::Some(descriptor)
+            if descriptor.category() == crate::HttpRpcCategory::Cluster && descriptor.coverage_release() == crate::HttpRpcCoverageRelease::V0_2_2 =>
+        {
+            std::result::Result::Ok(descriptor)
+        },
+        _ => std::result::Result::Err(
+            ksp_core_lib::Error::new(crate::ERROR_CODE_INVALID_RESPONSE, "typed Cluster descriptor is missing from the audited 0.2.2 registry")
+                .with_context("rpc_method", method),
+        ),
+    };
+}
+
 #[derive(serde::Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct WireClusterNode {
@@ -652,7 +776,6 @@ struct WireClusterNode {
     client_id: std::option::Option<std::string::String>,
 }
 
-#[cfg(test)]
 #[derive(serde::Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct WireEpochInfo {
@@ -664,7 +787,6 @@ struct WireEpochInfo {
     transaction_count: std::option::Option<u64>,
 }
 
-#[cfg(test)]
 #[derive(serde::Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct WireEpochSchedule {
@@ -675,7 +797,6 @@ struct WireEpochSchedule {
     warmup: bool,
 }
 
-#[cfg(test)]
 #[derive(serde::Deserialize)]
 struct WireSnapshotSlotInfo {
     full: u64,

crates/ksp-onchain-transport-lib/tests/public_api.rs

@@ -1,5 +1,5 @@
 // file: crates/ksp-onchain-transport-lib/tests/public_api.rs
-// version: 7
+// version: 8
 
 //! Integration tests for the public `ksp-onchain-transport-lib` consumer contract.
 
@@ -221,3 +221,14 @@ fn public_pre_004_token_wrappers_are_available_from_crate_root() {
     let selector = ksp_onchain_transport_lib::SolanaTokenAccountSelector::Mint(mint);
     assert!(matches!(selector, ksp_onchain_transport_lib::SolanaTokenAccountSelector::Mint(_)));
 }
+
+#[test]
+fn public_pre_005_simple_cluster_wrappers_are_available_from_crate_root() {
+    let _get_cluster_nodes = ksp_onchain_transport_lib::HttpTransportPool::get_cluster_nodes;
+    let _get_epoch_info = ksp_onchain_transport_lib::HttpTransportPool::get_epoch_info;
+    let _get_epoch_schedule = ksp_onchain_transport_lib::HttpTransportPool::get_epoch_schedule;
+    let _get_highest_snapshot_slot = ksp_onchain_transport_lib::HttpTransportPool::get_highest_snapshot_slot;
+    let _get_identity = ksp_onchain_transport_lib::HttpTransportPool::get_identity;
+    let _get_max_retransmit_slot = ksp_onchain_transport_lib::HttpTransportPool::get_max_retransmit_slot;
+    let _get_max_shred_insert_slot = ksp_onchain_transport_lib::HttpTransportPool::get_max_shred_insert_slot;
+}

crates/ksp-onchain-transport-lib/tests/release_completeness.rs

@@ -1,5 +1,5 @@
 // file: crates/ksp-onchain-transport-lib/tests/release_completeness.rs
-// version: 3
+// version: 4
 
 //! Release-level completeness canaries for the `0.2.1` HTTP foundation contract.
 
@@ -84,3 +84,30 @@ fn release_pre_004_tokens_subset_is_exact_and_retry_safe() {
         std::vec!["getTokenAccountBalance", "getTokenAccountsByDelegate", "getTokenAccountsByOwner", "getTokenLargestAccounts", "getTokenSupply",],
     );
 }
+
+#[test]
+fn release_pre_005_simple_cluster_subset_is_exact_and_retry_safe() {
+    let expected = std::vec![
+        "getClusterNodes",
+        "getEpochInfo",
+        "getEpochSchedule",
+        "getHighestSnapshotSlot",
+        "getIdentity",
+        "getMaxRetransmitSlot",
+        "getMaxShredInsertSlot",
+    ];
+    let deferred = std::vec!["getLeaderSchedule", "getSlot", "getSlotLeader", "getSlotLeaders", "getVoteAccounts"];
+    for method_name in &expected {
+        let descriptor = ksp_onchain_transport_lib::find_http_rpc_method(method_name).expect("pre.005 cluster descriptor must exist");
+        assert_eq!(descriptor.category(), ksp_onchain_transport_lib::HttpRpcCategory::Cluster);
+        assert_eq!(descriptor.coverage_release(), ksp_onchain_transport_lib::HttpRpcCoverageRelease::V0_2_2);
+        assert_eq!(descriptor.operation_kind(), ksp_onchain_transport_lib::RpcOperationKind::Read);
+        assert_eq!(descriptor.transport_retry_class(), ksp_onchain_transport_lib::TransportRetryClass::RetrySafe);
+    }
+    for method_name in &deferred {
+        let descriptor = ksp_onchain_transport_lib::find_http_rpc_method(method_name).expect("pre.006 cluster descriptor must remain registered");
+        assert_eq!(descriptor.coverage_release(), ksp_onchain_transport_lib::HttpRpcCoverageRelease::V0_2_2);
+    }
+    assert_eq!(expected.len(), 7);
+    assert_eq!(deferred.len(), 5);
+}

crates/ksp-onchain-transport-lib/unit_tests/rpc_cluster.rs

@@ -1,5 +1,5 @@
 // file: crates/ksp-onchain-transport-lib/unit_tests/rpc_cluster.rs
-// version: 2
+// version: 3
 
 #[test]
 fn cluster_node_fixture_preserves_v4_client_id_and_optional_fields() {
@@ -111,3 +111,213 @@ fn staged_vote_status_and_config_helpers_preserve_wire_shapes() {
     assert_eq!(status.current().len(), 1);
     assert!(status.delinquent().is_empty());
 }
+
+fn pool_for_url(url: &str) -> crate::HttpTransportPool {
+    let role = crate::HttpEndpointRoleSettings::new(
+        crate::HttpRoleName::new("default"),
+        true,
+        std::vec![crate::HttpRequestKind::wildcard()],
+        10,
+        crate::HttpRoleLimits::new(std::option::Option::None, std::option::Option::None, std::option::Option::None, std::option::Option::None),
+    );
+    let endpoint = crate::HttpEndpointSettings::new(
+        "fixture",
+        true,
+        crate::HttpProviderName::new("fixture"),
+        crate::HttpClusterName::new("local"),
+        crate::HttpEndpointUrl::parse(url).expect("fixture URL must parse"),
+        std::time::Duration::from_secs(1),
+        std::time::Duration::from_secs(1),
+        std::option::Option::Some(1),
+        std::vec![role],
+    );
+    let settings = crate::HttpTransportSettings::new(
+        std::vec![endpoint],
+        crate::HttpRetrySettings::new(0, std::time::Duration::from_millis(1), std::time::Duration::from_millis(1)),
+    );
+    return crate::HttpTransportPool::new(settings).expect("fixture pool must build");
+}
+
+fn serve_once(body: &'static str) -> (std::string::String, std::thread::JoinHandle<std::string::String>) {
+    let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("fixture listener must bind");
+    let address = listener.local_addr().expect("fixture listener address must resolve");
+    let handle = std::thread::spawn(move || {
+        let (mut stream, _) = listener.accept().expect("fixture server must accept one request");
+        let request = read_request(&mut stream);
+        let response = format!("HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\nConnection: close\r\n\r\n{}", body.len(), body);
+        std::io::Write::write_all(&mut stream, response.as_bytes()).expect("fixture response must write");
+        return request;
+    });
+    return (format!("http://{address}"), handle);
+}
+
+fn read_request(stream: &mut std::net::TcpStream) -> std::string::String {
+    let mut bytes = std::vec::Vec::new();
+    let mut buffer = [0_u8; 1024];
+    loop {
+        let count = std::io::Read::read(stream, &mut buffer).expect("fixture request must read");
+        if count == 0 {
+            break;
+        }
+        bytes.extend_from_slice(&buffer[..count]);
+        if request_complete(bytes.as_slice()) {
+            break;
+        }
+    }
+    return std::string::String::from_utf8(bytes).expect("fixture request must be UTF-8");
+}
+
+fn request_complete(bytes: &[u8]) -> bool {
+    let text = match std::str::from_utf8(bytes) {
+        std::result::Result::Ok(text) => text,
+        std::result::Result::Err(_) => return false,
+    };
+    let header_end = match text.find("\r\n\r\n") {
+        std::option::Option::Some(value) => value,
+        std::option::Option::None => return false,
+    };
+    let mut content_length = 0_usize;
+    for line in text[..header_end].lines() {
+        let (name, value) = match line.split_once(':') {
+            std::option::Option::Some(parts) => parts,
+            std::option::Option::None => continue,
+        };
+        if name.eq_ignore_ascii_case("content-length") {
+            content_length = value.trim().parse::<usize>().expect("content length must parse");
+        }
+    }
+    return bytes.len() >= header_end.saturating_add(4).saturating_add(content_length);
+}
+
+fn request_body(request: &str) -> serde_json::Value {
+    let body = request.split("\r\n\r\n").nth(1).expect("fixture request body must exist");
+    return serde_json::from_str(body).expect("fixture request body must be JSON");
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_cluster_nodes_preserves_optional_v4_fields_and_omissions() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_cluster_nodes.success.json"));
+    let pool = pool_for_url(url.as_str());
+    let nodes = pool.get_cluster_nodes(&crate::HttpRoleName::new("default")).await.expect("cluster nodes fixture must succeed");
+    assert_eq!(nodes.len(), 2);
+    assert_eq!(nodes[0].client_id(), std::option::Option::Some("Agave"));
+    assert_eq!(nodes[0].serve_repair(), std::option::Option::Some("127.0.0.1:8004"));
+    assert_eq!(nodes[1].rpc(), std::option::Option::None);
+    assert_eq!(nodes[1].client_id(), std::option::Option::None);
+    let request = handle.join().expect("fixture server must join");
+    let body = request_body(request.as_str());
+    assert_eq!(body["method"], serde_json::json!("getClusterNodes"));
+    assert_eq!(body["params"], serde_json::json!([]));
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_cluster_nodes_rejects_invalid_node_pubkey() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_cluster_nodes.invalid_pubkey.json"));
+    let pool = pool_for_url(url.as_str());
+    let result = pool.get_cluster_nodes(&crate::HttpRoleName::new("default")).await;
+    let error = result.expect_err("invalid cluster node pubkey must reject typed response");
+    assert_eq!(error.code(), crate::ERROR_CODE_INVALID_RESPONSE);
+    handle.join().expect("fixture server must join");
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_epoch_info_serializes_context_config_and_preserves_nullable_transaction_count() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_epoch_info.success.json"));
+    let pool = pool_for_url(url.as_str());
+    let config = crate::SolanaContextConfig::new(std::option::Option::Some(crate::SolanaCommitment::Finalized), std::option::Option::Some(429_000_000));
+    let info = pool
+        .get_epoch_info(&crate::HttpRoleName::new("default"), std::option::Option::Some(&config))
+        .await
+        .expect("epoch info fixture must succeed");
+    assert_eq!(info.absolute_slot(), 430_000_001);
+    assert_eq!(info.transaction_count(), std::option::Option::None);
+    let request = handle.join().expect("fixture server must join");
+    let body = request_body(request.as_str());
+    assert_eq!(body["params"], serde_json::json!([{"commitment":"finalized","minContextSlot":429000000}]));
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_epoch_info_omits_explicitly_empty_config() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_epoch_info.success.json"));
+    let pool = pool_for_url(url.as_str());
+    let config = crate::SolanaContextConfig::default();
+    let info = pool
+        .get_epoch_info(&crate::HttpRoleName::new("default"), std::option::Option::Some(&config))
+        .await
+        .expect("epoch info fixture must succeed");
+    assert_eq!(info.epoch(), 995);
+    let request = handle.join().expect("fixture server must join");
+    assert_eq!(request_body(request.as_str())["params"], serde_json::json!([]));
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_epoch_schedule_preserves_fixed_wire_shape() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_epoch_schedule.success.json"));
+    let pool = pool_for_url(url.as_str());
+    let schedule = pool.get_epoch_schedule(&crate::HttpRoleName::new("default")).await.expect("epoch schedule fixture must succeed");
+    assert_eq!(schedule.slots_per_epoch(), 432_000);
+    assert!(!schedule.warmup());
+    let request = handle.join().expect("fixture server must join");
+    assert_eq!(request_body(request.as_str())["method"], serde_json::json!("getEpochSchedule"));
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_highest_snapshot_slot_preserves_nullable_incremental_slot() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_highest_snapshot_slot.success.json"));
+    let pool = pool_for_url(url.as_str());
+    let snapshot = pool.get_highest_snapshot_slot(&crate::HttpRoleName::new("default")).await.expect("snapshot fixture must succeed");
+    assert_eq!(snapshot.full(), 429_990_000);
+    assert_eq!(snapshot.incremental(), std::option::Option::None);
+    let request = handle.join().expect("fixture server must join");
+    assert_eq!(request_body(request.as_str())["params"], serde_json::json!([]));
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_highest_snapshot_slot_preserves_no_snapshot_rpc_error() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_highest_snapshot_slot.error.json"));
+    let pool = pool_for_url(url.as_str());
+    let result = pool.get_highest_snapshot_slot(&crate::HttpRoleName::new("default")).await;
+    let error = result.expect_err("no snapshot must remain an RPC application error");
+    assert_eq!(error.code(), crate::ERROR_CODE_RPC_APPLICATION_ERROR);
+    handle.join().expect("fixture server must join");
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_identity_decodes_pubkey_object() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_identity.success.json"));
+    let pool = pool_for_url(url.as_str());
+    let identity = pool.get_identity(&crate::HttpRoleName::new("default")).await.expect("identity fixture must succeed");
+    assert_eq!(identity.to_string(), "ComputeBudget111111111111111111111111111111");
+    let request = handle.join().expect("fixture server must join");
+    assert_eq!(request_body(request.as_str())["method"], serde_json::json!("getIdentity"));
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_identity_rejects_invalid_wire_pubkey() {
+    let (url, handle) = serve_once(include_str!("../fixtures/http/get_identity.invalid_pubkey.json"));
+    let pool = pool_for_url(url.as_str());
+    let result = pool.get_identity(&crate::HttpRoleName::new("default")).await;
+    let error = result.expect_err("invalid identity pubkey must reject typed response");
+    assert_eq!(error.code(), crate::ERROR_CODE_INVALID_RESPONSE);
+    handle.join().expect("fixture server must join");
+}
+
+#[tokio::test(flavor = "current_thread")]
+async fn typed_get_max_cluster_slots_decode_u64_without_params() {
+    let (retransmit_url, retransmit_handle) = serve_once(include_str!("../fixtures/http/get_max_retransmit_slot.success.json"));
+    let retransmit_pool = pool_for_url(retransmit_url.as_str());
+    let retransmit = retransmit_pool.get_max_retransmit_slot(&crate::HttpRoleName::new("default")).await.expect("max retransmit slot fixture must succeed");
+    assert_eq!(retransmit, 430_000_010);
+    let retransmit_request = retransmit_handle.join().expect("fixture server must join");
+    let retransmit_body = request_body(retransmit_request.as_str());
+    assert_eq!(retransmit_body["method"], serde_json::json!("getMaxRetransmitSlot"));
+    assert_eq!(retransmit_body["params"], serde_json::json!([]));
+    let (shred_url, shred_handle) = serve_once(include_str!("../fixtures/http/get_max_shred_insert_slot.success.json"));
+    let shred_pool = pool_for_url(shred_url.as_str());
+    let shred = shred_pool.get_max_shred_insert_slot(&crate::HttpRoleName::new("default")).await.expect("max shred insert slot fixture must succeed");
+    assert_eq!(shred, 430_000_011);
+    let shred_request = shred_handle.join().expect("fixture server must join");
+    let shred_body = request_body(shred_request.as_str());
+    assert_eq!(shred_body["method"], serde_json::json!("getMaxShredInsertSlot"));
+    assert_eq!(shred_body["params"], serde_json::json!([]));
+}