Rebrand: polkadot → pezkuwi, substrate → bizinikiwi, kusama → dicle

2026-04-22 18:27:57 +00:00 · 2026-01-07 02:29:40 +03:00
commit d5f038faea
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+// Copyright 2017-2025 @pezkuwi/api-derive authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { Observable } from 'rxjs';
+import type { QueryableStorage } from '@pezkuwi/api-base/types';
+import type { Compact, Vec } from '@pezkuwi/types';
+import type { AccountId, BlockNumber, Header } from '@pezkuwi/types/interfaces';
+import type { PezpalletImOnlineSr25519AppSr25519Public } from '@pezkuwi/types/lookup';
+import type { Codec, IOption } from '@pezkuwi/types/types';
+import type { DeriveApi } from '../types.js';
+
+import { combineLatest, map, mergeMap, of, switchMap } from 'rxjs';
+
+import { memo, unwrapBlockNumber } from '../util/index.js';
+
+export type BlockNumberDerive = (instanceId: string, api: DeriveApi) => () => Observable<BlockNumber>;
+
+type OptionMapping = IOption<{ account: AccountId } & Codec>;
+type OptionNimbus = IOption<{ nimbus: PezpalletImOnlineSr25519AppSr25519Public } & Codec>;
+
+export function createBlockNumberDerive <T extends { number: Compact<BlockNumber> | BlockNumber }> (fn: (api: DeriveApi) => Observable<T>): BlockNumberDerive {
+  return (instanceId: string, api: DeriveApi) =>
+    memo(instanceId, () =>
+      fn(api).pipe(
+        map(unwrapBlockNumber)
+      )
+    );
+}
+
+/** @internal */
+function getAuthorDetailsWithAt (header: Header, queryAt: QueryableStorage<'rxjs'>): Observable<[Header, Vec<AccountId> | null, AccountId | null]> {
+  const validators = queryAt.session?.validators
+    ? queryAt.session.validators()
+    : of(null);
+
+  // nimbus consensus stores the session key of the block author in header logs
+  const { logs: [log] } = header.digest;
+  const loggedAuthor = (log && (
+    (log.isConsensus && log.asConsensus[0].isNimbus && log.asConsensus[1]) ||
+    (log.isPreRuntime && log.asPreRuntime[0].isNimbus && log.asPreRuntime[1])
+  ));
+
+  if (loggedAuthor) {
+    // use the author mapping pallet, if available (ie: moonbeam, moonriver), to map session (nimbus) key to author (collator/validator) key
+    if (queryAt['authorMapping']?.['mappingWithDeposit']) {
+      return combineLatest([
+        of(header),
+        validators,
+        queryAt['authorMapping']['mappingWithDeposit']<OptionMapping>(loggedAuthor).pipe(
+          map((o) =>
+            o.unwrapOr({ account: null }).account
+          )
+        )
+      ]);
+    }
+
+    // fall back to session and teyrchain staking pallets, if available (ie: manta, calamari), to map session (nimbus) key to author (collator) key
+    if (queryAt['teyrchainStaking']?.['selectedCandidates'] && queryAt.session?.nextKeys) {
+      const loggedHex = loggedAuthor.toHex();
+
+      return combineLatest([
+        of(header),
+        validators,
+        queryAt['teyrchainStaking']['selectedCandidates']<Vec<AccountId>>().pipe(
+          mergeMap((selectedCandidates) =>
+            combineLatest([
+              of(selectedCandidates),
+              queryAt.session.nextKeys.multi<OptionNimbus>(selectedCandidates).pipe(
+                map((nextKeys) =>
+                  nextKeys.findIndex((o) =>
+                    o.unwrapOrDefault().nimbus.toHex() === loggedHex
+                  )
+                )
+              )
+            ])
+          ),
+          map(([selectedCandidates, index]) =>
+            index === -1
+              ? null
+              : selectedCandidates[index]
+          )
+        )
+      ]);
+    }
+  }
+
+  // normal operation, non-mapping
+  return combineLatest([
+    of(header),
+    validators,
+    of(null)
+  ]);
+}
+
+export function getAuthorDetails (api: DeriveApi, header: Header, blockHash?: Uint8Array | string): Observable<[Header, Vec<AccountId> | null, AccountId | null]> {
+  // For on-chain state, we need to retrieve it as per the start
+  // of the block being constructed, i.e. session validators would
+  // be at the point of the block construction, not when all operations
+  // has been supplied.
+  //
+  // However for the first block (no parentHash available), we would
+  // just use the as-is
+  return api.queryAt(
+    header.parentHash.isEmpty
+      ? blockHash || header.hash
+      : header.parentHash
+  ).pipe(
+    switchMap((queryAt) =>
+      getAuthorDetailsWithAt(header, queryAt)
+    )
+  );
+}