feat(target_chains/near): fix abi build

Author: Riateche

target_chains/near/receiver/Cargo.lock

@@ -23,6 +23,7 @@ num-derive                 = { version = "0.3.3" }
 pyth-wormhole-attester-sdk = { path = "../../../wormhole_attester/sdk/rust" }
 pyth-sdk                   = { version = "0.7.0" }
 pythnet-sdk                = { path = "../../../pythnet/pythnet_sdk" }
+schemars                   = { version = "0.8.21" }
 serde_wormhole             = { git = "https://github.com/wormhole-foundation/wormhole", tag="rust-sdk-2024-01-25" }
 strum                      = { version = "0.24.1", features = ["derive"] }
 thiserror                  = { version = "1.0.38" }

target_chains/near/receiver/Cargo.toml

@@ -0,0 +1,10 @@
+fn main() {
+    // CARGO_NEAR_ABI_GENERATION env var is set by cargo-near when generating ABI.
+    // We need to expose it as a cfg option to allow conditional compilation
+    // of our JsonSchema impls.
+    println!("cargo::rerun-if-env-changed=CARGO_NEAR_ABI_GENERATION");
+    println!("cargo::rustc-check-cfg=cfg(abi)");
+    if std::env::var("CARGO_NEAR_ABI_GENERATION").as_deref() == Ok("true") {
+        println!("cargo::rustc-cfg=abi");
+    }
+}

target_chains/near/receiver/build.rs

@@ -6,6 +6,7 @@ use {
     },
     pyth_wormhole_attester_sdk::PriceAttestation,
     pythnet_sdk::messages::PriceFeedMessage,
+    schemars::{gen::SchemaGenerator, schema::Schema, JsonSchema},
     wormhole_sdk::Chain as WormholeChain,
 };
 
@@ -68,6 +69,20 @@ impl near_sdk::serde::Serialize for PriceIdentifier {
     }
 }
 
+impl JsonSchema for PriceIdentifier {
+    fn is_referenceable() -> bool {
+        false
+    }
+
+    fn schema_name() -> String {
+        String::schema_name()
+    }
+
+    fn json_schema(gen: &mut SchemaGenerator) -> Schema {
+        String::json_schema(gen)
+    }
+}
+
 /// A price with a degree of uncertainty, represented as a price +- a confidence interval.
 ///
 /// The confidence interval roughly corresponds to the standard error of a normal distribution.
@@ -79,6 +94,10 @@ impl near_sdk::serde::Serialize for PriceIdentifier {
 #[derive(BorshDeserialize, BorshSerialize, Debug, Deserialize, Serialize, PartialEq, Eq)]
 #[borsh(crate = "near_sdk::borsh")]
 #[serde(crate = "near_sdk::serde")]
+// I64 and U64 only implement JsonSchema when "abi" feature is enabled in near_sdk,
+// but unconditionally enabling this feature doesn't work, so we have to make this impl
+// conditional.
+#[cfg_attr(abi, derive(JsonSchema))]
 pub struct Price {
     pub price: I64,
     /// Confidence interval around the price
@@ -161,6 +180,7 @@ impl From<&PriceFeedMessage> for PriceFeed {
     PartialEq,
     PartialOrd,
     Serialize,
+    JsonSchema,
 )]
 #[borsh(crate = "near_sdk::borsh")]
 #[serde(crate = "near_sdk::serde")]
@@ -197,6 +217,7 @@ impl From<Chain> for u16 {
     PartialEq,
     PartialOrd,
     Serialize,
+    JsonSchema,
 )]
 #[borsh(crate = "near_sdk::borsh")]
 #[serde(crate = "near_sdk::serde")]