packages/typegen/src/generate/query.ts
// Copyright 2017-2024 @polkadot/typegen authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { StorageEntryMetadataLatest } from '@polkadot/types/interfaces';
import type { Metadata, PortableRegistry } from '@polkadot/types/metadata';
import type { Definitions, Registry } from '@polkadot/types/types';
import type { HexString } from '@polkadot/util/types';
import type { ModuleTypes } from '../util/imports.js';
import type { TypeImports } from '../util/index.js';
import type { ExtraTypes } from './types.js';
import Handlebars from 'handlebars';
import * as defaultDefs from '@polkadot/types/interfaces/definitions';
import { unwrapStorageSi } from '@polkadot/types/util';
import lookupDefinitions from '@polkadot/types-augment/lookup/definitions';
import { stringCamelCase } from '@polkadot/util';
import { compareName, createImports, formatType, getSimilarTypes, initMeta, readTemplate, setImports, writeFile } from '../util/index.js';
const generateForMetaTemplate = Handlebars.compile(readTemplate('query'));
// From a storage entry metadata, we return [args, returnType]
/** @internal */
function entrySignature (lookup: PortableRegistry, allDefs: Record<string, ModuleTypes>, registry: Registry, section: string, storageEntry: StorageEntryMetadataLatest, imports: TypeImports): [boolean, string, string, string] {
try {
const outputType = lookup.getTypeDef(unwrapStorageSi(storageEntry.type));
if (storageEntry.type.isPlain) {
const typeDef = lookup.getTypeDef(storageEntry.type.asPlain);
setImports(allDefs, imports, [
typeDef.lookupName || typeDef.type,
storageEntry.modifier.isOptional
? 'Option'
: null
]);
return [storageEntry.modifier.isOptional, '', '', formatType(registry, allDefs, outputType, imports)];
} else if (storageEntry.type.isMap) {
const { hashers, key, value } = storageEntry.type.asMap;
const keyDefs = hashers.length === 1
? [lookup.getTypeDef(key)]
: lookup.getSiType(key).def.asTuple.map((k) => lookup.getTypeDef(k));
const similarTypes = keyDefs.map((k) => getSimilarTypes(registry, allDefs, k.lookupName || k.type, imports));
const keyTypes = similarTypes.map((t) => t.join(' | '));
const defValue = lookup.getTypeDef(value);
setImports(allDefs, imports, [
...similarTypes.reduce<string[]>((all, t) => all.concat(t), []),
storageEntry.modifier.isOptional
? 'Option'
: null,
defValue.lookupName || defValue.type
]);
return [
storageEntry.modifier.isOptional,
keyDefs.map((k) => formatType(registry, allDefs, k.lookupName || k.type, imports)).join(', '),
keyTypes.map((t, i) => `arg${keyTypes.length === 1 ? '' : (i + 1)}: ${t}`).join(', '),
outputType.lookupName || formatType(registry, allDefs, outputType, imports)
];
}
throw new Error(`Expected Plain or Map type, found ${storageEntry.type.type}`);
} catch (error) {
throw new Error(`entrySignature: Cannot create signature for query ${section}.${storageEntry.name.toString()}:: ${(error as Error).message}`);
}
}
/** @internal */
function generateForMeta (registry: Registry, meta: Metadata, dest: string, extraTypes: ExtraTypes, isStrict: boolean, customLookupDefinitions?: Definitions): void {
writeFile(dest, (): string => {
const allTypes: ExtraTypes = {
'@polkadot/types-augment': {
lookup: {
...lookupDefinitions,
...customLookupDefinitions
}
},
'@polkadot/types/interfaces': defaultDefs,
...extraTypes
};
const imports = createImports(allTypes);
const allDefs = Object.entries(allTypes).reduce((defs, [path, obj]) => {
return Object.entries(obj).reduce((defs, [key, value]) => ({ ...defs, [`${path}/${key}`]: value }), defs);
}, {});
const { lookup, pallets } = meta.asLatest;
const modules = pallets
.filter(({ storage }) => storage.isSome)
.map(({ name, storage }) => {
const items = storage.unwrap().items
.map((storageEntry) => {
const [isOptional, args, params, _returnType] = entrySignature(lookup, allDefs, registry, name.toString(), storageEntry, imports);
const returnType = isOptional
? `Option<${_returnType}>`
: _returnType;
return {
args,
docs: storageEntry.docs,
entryType: 'AugmentedQuery',
name: stringCamelCase(storageEntry.name),
params,
returnType
};
})
.sort(compareName);
return {
items,
name: stringCamelCase(name)
};
})
.sort(compareName);
imports.typesTypes['Observable'] = true;
return generateForMetaTemplate({
headerType: 'chain',
imports,
isStrict,
modules,
types: [
...Object.keys(imports.localTypes).sort().map((packagePath): { file: string; types: string[] } => ({
file: packagePath.replace('@polkadot/types-augment', '@polkadot/types'),
types: Object.keys(imports.localTypes[packagePath])
})),
{
file: '@polkadot/api-base/types',
types: ['ApiTypes', 'AugmentedQuery', 'QueryableStorageEntry']
}
]
});
});
}
// Call `generateForMeta()` with current static metadata
/** @internal */
export function generateDefaultQuery (dest: string, data: HexString, extraTypes: ExtraTypes = {}, isStrict = false, customLookupDefinitions?: Definitions): void {
const { metadata, registry } = initMeta(data, extraTypes);
return generateForMeta(registry, metadata, dest, extraTypes, isStrict, customLookupDefinitions);
}