fix: derive Tempo zone IDs for non-production source chains

.changeset/zone-id-other-source-chains.md

@@ -0,0 +1,5 @@
+---
+"ox": patch
+---
+
+Fixed `ZoneId.fromChainId` for zones of Tempo chains other than mainnet and Moderato, whose chain IDs carry the source chain ID in the high 32 bits and the zone ID in the low 32 bits.

src/tempo/ZoneId.test.ts

@@ -13,6 +13,17 @@ describe('fromChainId', () => {
     )
   })
 
+  test('other source chains', () => {
+    // Source chain 31318, zone 1: 31318 * 2^32 + 1.
+    expect(ZoneId.fromChainId(134_509_785_776_129)).toMatchInlineSnapshot(`1`)
+    expect(
+      ZoneId.fromChainId(134_509_785_776_129, 42_431),
+    ).toMatchInlineSnapshot(`1`)
+    expect(ZoneId.fromChainId(2 ** 32 + 4_294_967_295)).toMatchInlineSnapshot(
+      `4294967295`,
+    )
+  })
+
   test('unsupported source id', () => {
     expect(() =>
       // @ts-expect-error Unsupported source ID.

src/tempo/ZoneId.ts

@@ -13,6 +13,9 @@ const chainIdConfig = {
 
 const defaultSourceId = 4_217
 
+/** Chain IDs at or above this value carry their source chain ID in the high 32 bits. */
+const genericChainIdBase = 2 ** 32
+
 /**
  * Base offset for deriving Presto zone chain IDs.
  */
@@ -24,7 +27,9 @@ export type SourceId = keyof typeof chainIdConfig
 /**
  * Derives a zone ID from a zone chain ID.
  *
- * Zone chain IDs use the base assigned to their Tempo source chain.
+ * Zone chain IDs use the base assigned to their Tempo source chain. Zones of other Tempo chains
+ * (such as devnets) encode the source chain ID in the high 32 bits and the zone ID in the low 32
+ * bits, so the zone ID is read from the chain ID alone.
  *
  * @example
  * ```ts twoslash
@@ -42,6 +47,7 @@ export function fromChainId(
   chainId: number,
   sourceId: SourceId = defaultSourceId,
 ): number {
+  if (chainId >= genericChainIdBase) return chainId % genericChainIdBase
   return chainId - getChainIdConfig(sourceId).base
 }