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main.ts
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import { code, Code, conditionalOutput, def, imp, joinCode } from 'ts-poet';
import { DescriptorProto, FieldDescriptorProto, FileDescriptorProto } from 'ts-proto-descriptors';
import {
basicLongWireType,
basicTypeName,
basicWireType,
defaultValue,
detectMapType,
getEnumMethod,
isAnyValueType,
isAnyValueTypeName,
isBytes,
isBytesValueType,
isEnum,
isFieldMaskType,
isListValueType,
isListValueTypeName,
isLong,
isLongValueType,
isMapType,
isMessage,
isObjectId,
isOptionalProperty,
isPrimitive,
isRepeated,
isScalar,
isStructType,
isStructTypeName,
isTimestamp,
isValueType,
isWholeNumber,
isWithinOneOf,
isWithinOneOfThatShouldBeUnion,
notDefaultCheck,
packedType,
toReaderCall,
toTypeName,
valueTypeName,
} from './types';
import SourceInfo, { Fields } from './sourceInfo';
import {
assertInstanceOf,
getFieldJsonName,
FormattedMethodDescriptor,
impProto,
maybeAddComment,
maybePrefixPackage,
getPropertyAccessor,
} from './utils';
import { camelToSnake, capitalize, maybeSnakeToCamel } from './case';
import {
generateNestjsGrpcServiceMethodsDecorator,
generateNestjsServiceClient,
generateNestjsServiceController,
} from './generate-nestjs';
import {
generateDataLoaderOptionsType,
generateDataLoadersType,
generateRpcType,
generateService,
generateServiceClientImpl,
} from './generate-services';
import {
addGrpcWebMisc,
generateGrpcClientImpl,
generateGrpcMethodDesc,
generateGrpcServiceDesc,
} from './generate-grpc-web';
import { generateEnum } from './enums';
import { visit, visitServices } from './visit';
import { DateOption, EnvOption, LongOption, OneofOption, Options, ServiceOption } from './options';
import { Context } from './context';
import { generateSchema } from './schema';
import { ConditionalOutput } from 'ts-poet/build/ConditionalOutput';
import { generateGrpcJsService } from './generate-grpc-js';
import { generateGenericServiceDefinition } from './generate-generic-service-definition';
export function generateFile(ctx: Context, fileDesc: FileDescriptorProto): [string, Code] {
const { options, utils } = ctx;
if (options.useOptionals === false) {
console.warn(
"ts-proto: Passing useOptionals as a boolean option is deprecated and will be removed in a future version. Please pass the string 'none' instead of false."
);
options.useOptionals = 'none';
} else if (options.useOptionals === true) {
console.warn(
"ts-proto: Passing useOptionals as a boolean option is deprecated and will be removed in a future version. Please pass the string 'messages' instead of true."
);
options.useOptionals = 'messages';
}
// Google's protofiles are organized like Java, where package == the folder the file
// is in, and file == a specific service within the package. I.e. you can have multiple
// company/foo.proto and company/bar.proto files, where package would be 'company'.
//
// We'll match that structure by setting up the module path as:
//
// company/foo.proto --> company/foo.ts
// company/bar.proto --> company/bar.ts
//
// We'll also assume that the fileDesc.name is already the `company/foo.proto` path, with
// the package already implicitly in it, so we won't re-append/strip/etc. it out/back in.
const suffix = `${options.fileSuffix}.ts`;
const moduleName = fileDesc.name.replace('.proto', suffix);
const chunks: Code[] = [];
// Indicate this file's source protobuf package for reflective use with google.protobuf.Any
if (options.exportCommonSymbols) {
chunks.push(code`export const protobufPackage = '${fileDesc.package}';`);
}
// Syntax, unlike most fields, is not repeated and thus does not use an index
const sourceInfo = SourceInfo.fromDescriptor(fileDesc);
const headerComment = sourceInfo.lookup(Fields.file.syntax, undefined);
maybeAddComment(headerComment, chunks, fileDesc.options?.deprecated);
// Apply formatting to methods here, so they propagate globally
for (let svc of fileDesc.service) {
for (let i = 0; i < svc.method.length; i++) {
svc.method[i] = new FormattedMethodDescriptor(svc.method[i], options);
}
}
// first make all the type declarations
visit(
fileDesc,
sourceInfo,
(fullName, message, sInfo, fullProtoTypeName) => {
chunks.push(
generateInterfaceDeclaration(ctx, fullName, message, sInfo, maybePrefixPackage(fileDesc, fullProtoTypeName))
);
},
options,
(fullName, enumDesc, sInfo) => {
chunks.push(generateEnum(ctx, fullName, enumDesc, sInfo));
}
);
// If nestJs=true export [package]_PACKAGE_NAME and [service]_SERVICE_NAME const
if (options.nestJs) {
const prefix = camelToSnake(fileDesc.package.replace(/\./g, '_'));
chunks.push(code`export const ${prefix}_PACKAGE_NAME = '${fileDesc.package}';`);
}
if (options.outputEncodeMethods || options.outputJsonMethods || options.outputTypeRegistry) {
// then add the encoder/decoder/base instance
visit(
fileDesc,
sourceInfo,
(fullName, message, sInfo, fullProtoTypeName) => {
const fullTypeName = maybePrefixPackage(fileDesc, fullProtoTypeName);
chunks.push(generateBaseInstanceFactory(ctx, fullName, message, fullTypeName));
const staticMembers: Code[] = [];
if (options.outputTypeRegistry) {
staticMembers.push(code`$type: '${fullTypeName}' as const`);
}
if (options.outputEncodeMethods) {
staticMembers.push(generateEncode(ctx, fullName, message));
staticMembers.push(generateDecode(ctx, fullName, message));
}
if (options.outputJsonMethods) {
staticMembers.push(generateFromJson(ctx, fullName, message));
staticMembers.push(generateToJson(ctx, fullName, message));
}
if (options.outputPartialMethods) {
staticMembers.push(generateFromPartial(ctx, fullName, message));
}
staticMembers.push(...generateWrap(ctx, fullTypeName));
staticMembers.push(...generateUnwrap(ctx, fullTypeName));
chunks.push(code`
export const ${def(fullName)} = {
${joinCode(staticMembers, { on: ',\n\n' })}
};
`);
if (options.outputTypeRegistry) {
const messageTypeRegistry = imp('messageTypeRegistry@./typeRegistry');
chunks.push(code`
${messageTypeRegistry}.set(${fullName}.$type, ${fullName});
`);
}
},
options
);
}
let hasServerStreamingMethods = false;
let hasStreamingMethods = false;
visitServices(fileDesc, sourceInfo, (serviceDesc, sInfo) => {
if (options.nestJs) {
// NestJS is sufficiently different that we special case all of the client/server interfaces
// generate nestjs grpc client interface
chunks.push(generateNestjsServiceClient(ctx, fileDesc, sInfo, serviceDesc));
// and the service controller interface
chunks.push(generateNestjsServiceController(ctx, fileDesc, sInfo, serviceDesc));
// generate nestjs grpc service controller decorator
chunks.push(generateNestjsGrpcServiceMethodsDecorator(ctx, serviceDesc));
let serviceConstName = `${camelToSnake(serviceDesc.name)}_NAME`;
if (!serviceDesc.name.toLowerCase().endsWith('service')) {
serviceConstName = `${camelToSnake(serviceDesc.name)}_SERVICE_NAME`;
}
chunks.push(code`export const ${serviceConstName} = "${serviceDesc.name}";`);
} else if (options.outputServices === ServiceOption.GRPC) {
chunks.push(generateGrpcJsService(ctx, fileDesc, sInfo, serviceDesc));
} else if (options.outputServices === ServiceOption.GENERIC) {
chunks.push(generateGenericServiceDefinition(ctx, fileDesc, sInfo, serviceDesc));
} else if (options.outputServices === ServiceOption.DEFAULT) {
// This service could be Twirp or grpc-web or JSON (maybe). So far all of their
// interfaces are fairly similar so we share the same service interface.
chunks.push(generateService(ctx, fileDesc, sInfo, serviceDesc));
if (options.outputClientImpl === true) {
chunks.push(generateServiceClientImpl(ctx, fileDesc, serviceDesc));
} else if (options.outputClientImpl === 'grpc-web') {
chunks.push(generateGrpcClientImpl(ctx, fileDesc, serviceDesc));
chunks.push(generateGrpcServiceDesc(fileDesc, serviceDesc));
serviceDesc.method.forEach((method) => {
chunks.push(generateGrpcMethodDesc(ctx, serviceDesc, method));
if (method.serverStreaming) {
hasServerStreamingMethods = true;
}
});
}
}
serviceDesc.method.forEach((methodDesc, index) => {
if (methodDesc.serverStreaming || methodDesc.clientStreaming) {
hasStreamingMethods = true;
}
});
});
if (options.outputServices === ServiceOption.DEFAULT && options.outputClientImpl && fileDesc.service.length > 0) {
if (options.outputClientImpl === true) {
chunks.push(generateRpcType(ctx, hasStreamingMethods));
} else if (options.outputClientImpl === 'grpc-web') {
chunks.push(addGrpcWebMisc(ctx, hasServerStreamingMethods));
}
}
if (options.context) {
chunks.push(generateDataLoaderOptionsType());
chunks.push(generateDataLoadersType());
}
if (options.outputSchema) {
chunks.push(...generateSchema(ctx, fileDesc, sourceInfo));
}
chunks.push(
...Object.values(utils).map((v) => {
if (v instanceof ConditionalOutput) {
return code`${v.ifUsed}`;
} else if (v instanceof Code) {
return v;
} else {
return code``;
}
})
);
// Finally, reset method definitions to their original state (unformatted)
// This is mainly so that the `meta-typings` tests pass
for (let svc of fileDesc.service) {
for (let i = 0; i < svc.method.length; i++) {
const methodInfo = svc.method[i];
assertInstanceOf(methodInfo, FormattedMethodDescriptor);
svc.method[i] = methodInfo.getSource();
}
}
return [moduleName, joinCode(chunks, { on: '\n\n' })];
}
export type Utils = ReturnType<typeof makeDeepPartial> &
ReturnType<typeof makeObjectIdMethods> &
ReturnType<typeof makeTimestampMethods> &
ReturnType<typeof makeByteUtils> &
ReturnType<typeof makeLongUtils> &
ReturnType<typeof makeComparisonUtils>;
/** These are runtime utility methods used by the generated code. */
export function makeUtils(options: Options): Utils {
const bytes = makeByteUtils();
const longs = makeLongUtils(options, bytes);
return {
...bytes,
...makeDeepPartial(options, longs),
...makeObjectIdMethods(options),
...makeTimestampMethods(options, longs),
...longs,
...makeComparisonUtils(),
};
}
function makeLongUtils(options: Options, bytes: ReturnType<typeof makeByteUtils>) {
// Regardless of which `forceLong` config option we're using, we always use
// the `long` library to either represent or at least sanity-check 64-bit values
const util = imp('util@protobufjs/minimal');
const configure = imp('configure@protobufjs/minimal');
// Before esModuleInterop, we had to use 'import * as Long from long` b/c long is
// an `export =` module and exports only the Long constructor (which is callable).
// See https://www.typescriptlang.org/docs/handbook/modules.html#export--and-import--require.
//
// With esModuleInterop on, `* as Long` is no longer the constructor, it's the module,
// so we want to go back to `import { Long } from long`, which is specifically forbidden
// due to `export =` w/o esModuleInterop.
//
// I.e there is not an import for long that "just works" in both esModuleInterop and
// not esModuleInterop.
const Long = options.esModuleInterop ? imp('Long=long') : imp('Long*long');
const disclaimer = options.esModuleInterop
? ''
: `
// If you get a compile-error about 'Constructor<Long> and ... have no overlap',
// add '--ts_proto_opt=esModuleInterop=true' as a flag when calling 'protoc'.`;
// Kinda hacky, but we always init long unless in onlyTypes mode. I'd rather do
// this more implicitly, like if `Long@long` is imported or something like that.
const longInit = options.onlyTypes
? code``
: code`
${disclaimer}
if (${util}.Long !== ${Long}) {
${util}.Long = ${Long} as any;
${configure}();
}
`;
// TODO This is unused?
const numberToLong = conditionalOutput(
'numberToLong',
code`
function numberToLong(number: number) {
return ${Long}.fromNumber(number);
}
`
);
const longToString = conditionalOutput(
'longToString',
code`
function longToString(long: ${Long}) {
return long.toString();
}
`
);
const longToNumber = conditionalOutput(
'longToNumber',
code`
function longToNumber(long: ${Long}): number {
if (long.gt(Number.MAX_SAFE_INTEGER)) {
throw new ${bytes.globalThis}.Error("Value is larger than Number.MAX_SAFE_INTEGER")
}
return long.toNumber();
}
`
);
return { numberToLong, longToNumber, longToString, longInit, Long };
}
function makeByteUtils() {
const globalThis = conditionalOutput(
'globalThis',
code`
declare var self: any | undefined;
declare var window: any | undefined;
declare var global: any | undefined;
var globalThis: any = (() => {
if (typeof globalThis !== "undefined") return globalThis;
if (typeof self !== "undefined") return self;
if (typeof window !== "undefined") return window;
if (typeof global !== "undefined") return global;
throw "Unable to locate global object";
})();
`
);
const bytesFromBase64 = conditionalOutput(
'bytesFromBase64',
code`
const atob: (b64: string) => string = ${globalThis}.atob || ((b64) => ${globalThis}.Buffer.from(b64, 'base64').toString('binary'));
function bytesFromBase64(b64: string): Uint8Array {
const bin = atob(b64);
const arr = new Uint8Array(bin.length);
for (let i = 0; i < bin.length; ++i) {
arr[i] = bin.charCodeAt(i);
}
return arr;
}
`
);
const base64FromBytes = conditionalOutput(
'base64FromBytes',
code`
const btoa : (bin: string) => string = ${globalThis}.btoa || ((bin) => ${globalThis}.Buffer.from(bin, 'binary').toString('base64'));
function base64FromBytes(arr: Uint8Array): string {
const bin: string[] = [];
for (const byte of arr) {
bin.push(String.fromCharCode(byte));
}
return btoa(bin.join(''));
}
`
);
return { globalThis, bytesFromBase64, base64FromBytes };
}
function makeDeepPartial(options: Options, longs: ReturnType<typeof makeLongUtils>) {
let oneofCase = '';
if (options.oneof === OneofOption.UNIONS) {
oneofCase = `
: T extends { $case: string }
? { [K in keyof Omit<T, '$case'>]?: DeepPartial<T[K]> } & { $case: T['$case'] }
`;
}
const maybeExport = options.exportCommonSymbols ? 'export' : '';
// Allow passing longs as numbers or strings, nad we'll convert them
const maybeLong =
options.forceLong === LongOption.LONG ? code` : T extends ${longs.Long} ? string | number | Long ` : '';
const Builtin = conditionalOutput(
'Builtin',
code`type Builtin = Date | Function | Uint8Array | string | number | boolean | undefined;`
);
// Based on https://github.com/sindresorhus/type-fest/pull/259
const maybeExcludeType = options.outputTypeRegistry ? `| '$type'` : '';
const Exact = conditionalOutput(
'Exact',
code`
type KeysOfUnion<T> = T extends T ? keyof T : never;
${maybeExport} type Exact<P, I extends P> = P extends ${Builtin}
? P
: P &
{ [K in keyof P]: Exact<P[K], I[K]> } & Record<Exclude<keyof I, KeysOfUnion<P> ${maybeExcludeType}>, never>;
`
);
// Based on the type from ts-essentials
const keys = options.outputTypeRegistry ? code`Exclude<keyof T, '$type'>` : code`keyof T`;
const DeepPartial = conditionalOutput(
'DeepPartial',
code`
${maybeExport} type DeepPartial<T> = T extends ${Builtin}
? T
${maybeLong}
: T extends Array<infer U>
? Array<DeepPartial<U>>
: T extends ReadonlyArray<infer U>
? ReadonlyArray<DeepPartial<U>>${oneofCase}
: T extends {}
? { [K in ${keys}]?: DeepPartial<T[K]> }
: Partial<T>;
`
);
return { Builtin, DeepPartial, Exact };
}
function makeObjectIdMethods(options: Options) {
const mongodb = imp('mongodb*mongodb');
const fromProtoObjectId = conditionalOutput(
'fromProtoObjectId',
code`
function fromProtoObjectId(oid: ObjectId): ${mongodb}.ObjectId {
return new ${mongodb}.ObjectId(oid.value);
}
`
);
const fromJsonObjectId = conditionalOutput(
'fromJsonObjectId',
code`
function fromJsonObjectId(o: any): ${mongodb}.ObjectId {
if (o instanceof ${mongodb}.ObjectId) {
return o;
} else if (typeof o === "string") {
return new ${mongodb}.ObjectId(o);
} else {
return ${fromProtoObjectId}(ObjectId.fromJSON(o));
}
}
`
);
const toProtoObjectId = conditionalOutput(
'toProtoObjectId',
code`
function toProtoObjectId(oid: ${mongodb}.ObjectId): ObjectId {
const value = oid.toString();
return { value };
}
`
);
return { fromJsonObjectId, fromProtoObjectId, toProtoObjectId };
}
function makeTimestampMethods(options: Options, longs: ReturnType<typeof makeLongUtils>) {
const Timestamp = impProto(options, 'google/protobuf/timestamp', 'Timestamp');
let seconds: string | Code = 'date.getTime() / 1_000';
let toNumberCode = 't.seconds';
if (options.forceLong === LongOption.LONG) {
toNumberCode = 't.seconds.toNumber()';
seconds = code`${longs.numberToLong}(date.getTime() / 1_000)`;
} else if (options.forceLong === LongOption.STRING) {
toNumberCode = 'Number(t.seconds)';
// Must discard the fractional piece here
// Otherwise the fraction ends up on the seconds when parsed as a Long
// (note this only occurs when the string is > 8 characters)
seconds = 'Math.trunc(date.getTime() / 1_000).toString()';
}
const maybeTypeField = options.outputTypeRegistry ? `$type: 'google.protobuf.Timestamp',` : '';
const toTimestamp = conditionalOutput(
'toTimestamp',
options.useDate === DateOption.STRING
? code`
function toTimestamp(dateStr: string): ${Timestamp} {
const date = new Date(dateStr);
const seconds = ${seconds};
const nanos = (date.getTime() % 1_000) * 1_000_000;
return { ${maybeTypeField} seconds, nanos };
}
`
: code`
function toTimestamp(date: Date): ${Timestamp} {
const seconds = ${seconds};
const nanos = (date.getTime() % 1_000) * 1_000_000;
return { ${maybeTypeField} seconds, nanos };
}
`
);
const fromTimestamp = conditionalOutput(
'fromTimestamp',
options.useDate === DateOption.STRING
? code`
function fromTimestamp(t: ${Timestamp}): string {
let millis = ${toNumberCode} * 1_000;
millis += t.nanos / 1_000_000;
return new Date(millis).toISOString();
}
`
: code`
function fromTimestamp(t: ${Timestamp}): Date {
let millis = ${toNumberCode} * 1_000;
millis += t.nanos / 1_000_000;
return new Date(millis);
}
`
);
const fromJsonTimestamp = conditionalOutput(
'fromJsonTimestamp',
options.useDate === DateOption.DATE
? code`
function fromJsonTimestamp(o: any): Date {
if (o instanceof Date) {
return o;
} else if (typeof o === "string") {
return new Date(o);
} else {
return ${fromTimestamp}(Timestamp.fromJSON(o));
}
}
`
: code`
function fromJsonTimestamp(o: any): Timestamp {
if (o instanceof Date) {
return ${toTimestamp}(o);
} else if (typeof o === "string") {
return ${toTimestamp}(new Date(o));
} else {
return Timestamp.fromJSON(o);
}
}
`
);
return { toTimestamp, fromTimestamp, fromJsonTimestamp };
}
function makeComparisonUtils() {
const isObject = conditionalOutput(
'isObject',
code`
function isObject(value: any): boolean {
return typeof value === 'object' && value !== null;
}`
);
const isSet = conditionalOutput(
'isSet',
code`
function isSet(value: any): boolean {
return value !== null && value !== undefined;
}`
);
return { isObject, isSet };
}
// Create the interface with properties
function generateInterfaceDeclaration(
ctx: Context,
fullName: string,
messageDesc: DescriptorProto,
sourceInfo: SourceInfo,
fullTypeName: string
): Code {
const { options } = ctx;
const chunks: Code[] = [];
maybeAddComment(sourceInfo, chunks, messageDesc.options?.deprecated);
// interface name should be defined to avoid import collisions
chunks.push(code`export interface ${def(fullName)} {`);
if (ctx.options.outputTypeRegistry) {
chunks.push(code`$type: '${fullTypeName}',`);
}
// When oneof=unions, we generate a single property with an ADT per `oneof` clause.
const processedOneofs = new Set<number>();
messageDesc.field.forEach((fieldDesc, index) => {
if (isWithinOneOfThatShouldBeUnion(options, fieldDesc)) {
const { oneofIndex } = fieldDesc;
if (!processedOneofs.has(oneofIndex)) {
processedOneofs.add(oneofIndex);
chunks.push(generateOneofProperty(ctx, messageDesc, oneofIndex, sourceInfo));
}
return;
}
const info = sourceInfo.lookup(Fields.message.field, index);
maybeAddComment(info, chunks, fieldDesc.options?.deprecated);
const name = maybeSnakeToCamel(fieldDesc.name, options);
const type = toTypeName(ctx, messageDesc, fieldDesc);
const q = isOptionalProperty(fieldDesc, messageDesc.options, options) ? '?' : '';
chunks.push(code`${name}${q}: ${type}, `);
});
chunks.push(code`}`);
return joinCode(chunks, { on: '\n' });
}
function generateOneofProperty(
ctx: Context,
messageDesc: DescriptorProto,
oneofIndex: number,
sourceInfo: SourceInfo
): Code {
const { options } = ctx;
const fields = messageDesc.field.filter((field) => isWithinOneOf(field) && field.oneofIndex === oneofIndex);
const unionType = joinCode(
fields.map((f) => {
let fieldName = maybeSnakeToCamel(f.name, options);
let typeName = toTypeName(ctx, messageDesc, f);
return code`{ $case: '${fieldName}', ${fieldName}: ${typeName} }`;
}),
{ on: ' | ' }
);
const name = maybeSnakeToCamel(messageDesc.oneofDecl[oneofIndex].name, options);
return code`${name}?: ${unionType},`;
/*
// Ideally we'd put the comments for each oneof field next to the anonymous
// type we've created in the type union above, but ts-poet currently lacks
// that ability. For now just concatenate all comments into one big one.
let comments: Array<string> = [];
const info = sourceInfo.lookup(Fields.message.oneof_decl, oneofIndex);
maybeAddComment(info, (text) => comments.push(text));
messageDesc.field.forEach((field, index) => {
if (!isWithinOneOf(field) || field.oneofIndex !== oneofIndex) {
return;
}
const info = sourceInfo.lookup(Fields.message.field, index);
const name = maybeSnakeToCamel(field.name, options);
maybeAddComment(info, (text) => comments.push(name + '\n' + text));
});
if (comments.length) {
prop = prop.addJavadoc(comments.join('\n'));
}
return prop;
*/
}
// Create a function that constructs 'base' instance with default values for decode to use as a prototype
function generateBaseInstanceFactory(
ctx: Context,
fullName: string,
messageDesc: DescriptorProto,
fullTypeName: string
): Code {
const fields: Code[] = [];
// When oneof=unions, we generate a single property with an ADT per `oneof` clause.
const processedOneofs = new Set<number>();
for (const field of messageDesc.field) {
if (isWithinOneOfThatShouldBeUnion(ctx.options, field)) {
const { oneofIndex } = field;
if (!processedOneofs.has(oneofIndex)) {
processedOneofs.add(oneofIndex);
const name = maybeSnakeToCamel(messageDesc.oneofDecl[oneofIndex].name, ctx.options);
fields.push(code`${name}: undefined`);
}
continue;
}
const name = maybeSnakeToCamel(field.name, ctx.options);
const val = isWithinOneOf(field)
? 'undefined'
: isMapType(ctx, messageDesc, field)
? '{}'
: isRepeated(field)
? '[]'
: defaultValue(ctx, field);
fields.push(code`${name}: ${val}`);
}
if (ctx.options.outputTypeRegistry) {
fields.unshift(code`$type: '${fullTypeName}'`);
}
return code`
function createBase${fullName}(): ${fullName} {
return { ${joinCode(fields, { on: ',' })} };
}
`;
}
/** Creates a function to decode a message by loop overing the tags. */
function generateDecode(ctx: Context, fullName: string, messageDesc: DescriptorProto): Code {
const { options, utils, typeMap } = ctx;
const chunks: Code[] = [];
let createBase = code`createBase${fullName}()`;
if (options.usePrototypeForDefaults) {
createBase = code`Object.create(${createBase}) as ${fullName}`;
}
// create the basic function declaration
chunks.push(code`
decode(
input: ${Reader} | Uint8Array,
length?: number,
): ${fullName} {
const reader = input instanceof ${Reader} ? input : new ${Reader}(input);
let end = length === undefined ? reader.len : reader.pos + length;
const message = ${createBase};
`);
if (options.unknownFields) {
chunks.push(code`(message as any)._unknownFields = {}`);
}
// start the tag loop
chunks.push(code`
while (reader.pos < end) {
const tag = reader.uint32();
switch (tag >>> 3) {
`);
// add a case for each incoming field
messageDesc.field.forEach((field) => {
const fieldName = maybeSnakeToCamel(field.name, options);
chunks.push(code`case ${field.number}:`);
// get a generic 'reader.doSomething' bit that is specific to the basic type
let readSnippet: Code;
if (isPrimitive(field)) {
readSnippet = code`reader.${toReaderCall(field)}()`;
if (isBytes(field)) {
if (options.env === EnvOption.NODE) {
readSnippet = code`${readSnippet} as Buffer`;
}
} else if (basicLongWireType(field.type) !== undefined) {
if (options.forceLong === LongOption.LONG) {
readSnippet = code`${readSnippet} as Long`;
} else if (options.forceLong === LongOption.STRING) {
readSnippet = code`${utils.longToString}(${readSnippet} as Long)`;
} else {
readSnippet = code`${utils.longToNumber}(${readSnippet} as Long)`;
}
} else if (isEnum(field)) {
if (options.stringEnums) {
const fromJson = getEnumMethod(ctx, field.typeName, 'FromJSON');
readSnippet = code`${fromJson}(${readSnippet})`;
} else {
readSnippet = code`${readSnippet} as any`;
}
}
} else if (isValueType(ctx, field)) {
const type = basicTypeName(ctx, field, { keepValueType: true });
const unwrap = (decodedValue: any): Code => {
if (isListValueType(field) || isStructType(field) || isAnyValueType(field)) {
return code`${type}.unwrap(${decodedValue})`;
}
return code`${decodedValue}.value`;
};
const decoder = code`${type}.decode(reader, reader.uint32())`;
readSnippet = code`${unwrap(decoder)}`;
} else if (isTimestamp(field) && (options.useDate === DateOption.DATE || options.useDate === DateOption.STRING)) {
const type = basicTypeName(ctx, field, { keepValueType: true });
readSnippet = code`${utils.fromTimestamp}(${type}.decode(reader, reader.uint32()))`;
} else if (isObjectId(field) && options.useMongoObjectId) {
const type = basicTypeName(ctx, field, { keepValueType: true });
readSnippet = code`${utils.fromProtoObjectId}(${type}.decode(reader, reader.uint32()))`;
} else if (isMessage(field)) {
const type = basicTypeName(ctx, field);
readSnippet = code`${type}.decode(reader, reader.uint32())`;
} else {
throw new Error(`Unhandled field ${field}`);
}
// and then use the snippet to handle repeated fields if necessary
if (isRepeated(field)) {
const maybeNonNullAssertion = ctx.options.useOptionals === 'all' ? '!' : '';
if (isMapType(ctx, messageDesc, field)) {
// We need a unique const within the `cast` statement
const varName = `entry${field.number}`;
chunks.push(code`
const ${varName} = ${readSnippet};
if (${varName}.value !== undefined) {
message.${fieldName}${maybeNonNullAssertion}[${varName}.key] = ${varName}.value;
}
`);
} else if (packedType(field.type) === undefined) {
chunks.push(code`message.${fieldName}${maybeNonNullAssertion}.push(${readSnippet});`);
} else {
chunks.push(code`
if ((tag & 7) === 2) {
const end2 = reader.uint32() + reader.pos;
while (reader.pos < end2) {
message.${fieldName}${maybeNonNullAssertion}.push(${readSnippet});
}
} else {
message.${fieldName}${maybeNonNullAssertion}.push(${readSnippet});
}
`);
}
} else if (isWithinOneOfThatShouldBeUnion(options, field)) {
let oneofName = maybeSnakeToCamel(messageDesc.oneofDecl[field.oneofIndex].name, options);
chunks.push(code`message.${oneofName} = { $case: '${fieldName}', ${fieldName}: ${readSnippet} };`);
} else {
chunks.push(code`message.${fieldName} = ${readSnippet};`);
}
chunks.push(code`break;`);
});
if (options.unknownFields) {
chunks.push(code`
default:
const startPos = reader.pos;
reader.skipType(tag & 7);
(message as any)._unknownFields[tag] = [...((message as any)._unknownFields[tag] || []), reader.buf.slice(startPos, reader.pos)];
break;
`);
} else {
chunks.push(code`
default:
reader.skipType(tag & 7);
break;
`);
}
// and then wrap up the switch/while/return
chunks.push(code`}`);
chunks.push(code`}`);
chunks.push(code`return message;`);
chunks.push(code`}`);
return joinCode(chunks, { on: '\n' });
}
const Writer = imp('Writer@protobufjs/minimal');
const Reader = imp('Reader@protobufjs/minimal');
/** Creates a function to encode a message by loop overing the tags. */
function generateEncode(ctx: Context, fullName: string, messageDesc: DescriptorProto): Code {
const { options, utils, typeMap } = ctx;
const chunks: Code[] = [];
// create the basic function declaration
chunks.push(code`
encode(
${messageDesc.field.length > 0 || options.unknownFields ? 'message' : '_'}: ${fullName},
writer: ${Writer} = ${Writer}.create(),
): ${Writer} {
`);
// then add a case for each field
messageDesc.field.forEach((field) => {
const fieldName = maybeSnakeToCamel(field.name, options);
// get a generic writer.doSomething based on the basic type
let writeSnippet: (place: string) => Code;
if (isEnum(field) && options.stringEnums) {
const tag = ((field.number << 3) | basicWireType(field.type)) >>> 0;
const toNumber = getEnumMethod(ctx, field.typeName, 'ToNumber');
writeSnippet = (place) => code`writer.uint32(${tag}).${toReaderCall(field)}(${toNumber}(${place}))`;
} else if (isScalar(field) || isEnum(field)) {
const tag = ((field.number << 3) | basicWireType(field.type)) >>> 0;
writeSnippet = (place) => code`writer.uint32(${tag}).${toReaderCall(field)}(${place})`;
} else if (isObjectId(field) && options.useMongoObjectId) {
const tag = ((field.number << 3) | 2) >>> 0;
const type = basicTypeName(ctx, field, { keepValueType: true });
writeSnippet = (place) =>
code`${type}.encode(${utils.toProtoObjectId}(${place}), writer.uint32(${tag}).fork()).ldelim()`;
} else if (isTimestamp(field) && (options.useDate === DateOption.DATE || options.useDate === DateOption.STRING)) {
const tag = ((field.number << 3) | 2) >>> 0;
const type = basicTypeName(ctx, field, { keepValueType: true });
writeSnippet = (place) =>
code`${type}.encode(${utils.toTimestamp}(${place}), writer.uint32(${tag}).fork()).ldelim()`;
} else if (isValueType(ctx, field)) {
const maybeTypeField = options.outputTypeRegistry ? `$type: '${field.typeName.slice(1)}',` : '';
const type = basicTypeName(ctx, field, { keepValueType: true });
const wrappedValue = (place: string): Code => {
if (isAnyValueType(field) || isListValueType(field) || isStructType(field)) {
return code`${type}.wrap(${place})`;
}
return code`{${maybeTypeField} value: ${place}!}`;
};
const tag = ((field.number << 3) | 2) >>> 0;
writeSnippet = (place) => code`${type}.encode(${wrappedValue(place)}, writer.uint32(${tag}).fork()).ldelim()`;
} else if (isMessage(field)) {
const tag = ((field.number << 3) | 2) >>> 0;
const type = basicTypeName(ctx, field);
writeSnippet = (place) => code`${type}.encode(${place}, writer.uint32(${tag}).fork()).ldelim()`;
} else {
throw new Error(`Unhandled field ${field}`);
}
const isOptional = isOptionalProperty(field, messageDesc.options, options);
if (isRepeated(field)) {
if (isMapType(ctx, messageDesc, field)) {
const valueType = (typeMap.get(field.typeName)![2] as DescriptorProto).field[1];
const maybeTypeField = options.outputTypeRegistry ? `$type: '${field.typeName.slice(1)}',` : '';
const entryWriteSnippet = isValueType(ctx, valueType)
? code`
if (value !== undefined) {
${writeSnippet(`{ ${maybeTypeField} key: key as any, value }`)};
}
`
: writeSnippet(`{ ${maybeTypeField} key: key as any, value }`);
const optionalAlternative = isOptional ? ' || {}' : '';
chunks.push(code`
Object.entries(message.${fieldName}${optionalAlternative}).forEach(([key, value]) => {
${entryWriteSnippet}
});
`);
} else if (packedType(field.type) === undefined) {
const listWriteSnippet = code`
for (const v of message.${fieldName}) {
${writeSnippet('v!')};
}
`;
if (isOptional) {
chunks.push(code`
if (message.${fieldName} !== undefined && message.${fieldName}.length !== 0) {
${listWriteSnippet}
}
`);
} else {
chunks.push(listWriteSnippet);
}
} else if (isEnum(field) && options.stringEnums) {
// This is a lot like the `else` clause, but we wrap `fooToNumber` around it.
// Ideally we'd reuse `writeSnippet` here, but `writeSnippet` has the `writer.uint32(tag)`
// embedded inside of it, and we want to drop that so that we can encode it packed
// (i.e. just one tag and multiple values).