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feat: add serialization context to data conversion interfaces #1950

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cb8a6b6
common: add serialization context contracts and converter binding helper
THardy98 Feb 23, 2026
ce6c5ad
client: apply workflow serialization context at conversion call sites
THardy98 Feb 23, 2026
08d2be1
worker: bind activity serialization context for args, failures, and h…
THardy98 Feb 23, 2026
9e8f8b8
workflow: apply serialization context in isolate encode/decode paths
THardy98 Feb 23, 2026
906a141
worker: make workflow codec runner context-aware by command sequence
THardy98 Feb 23, 2026
5623f0b
fix: split external signal/cancel serialization context seq maps
THardy98 Feb 23, 2026
d0bccf0
refactor: simplify serialization context implementation
THardy98 Feb 24, 2026
638ce22
test: add comprehensive serialization context test coverage
THardy98 Feb 24, 2026
01db857
codec runner, reduce diff
THardy98 Feb 25, 2026
8a48fba
refactor: address PR review comments for serialization context
THardy98 Mar 6, 2026
15915b2
formatting & linting
THardy98 Mar 6, 2026
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38 changes: 33 additions & 5 deletions packages/client/src/async-completion-client.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import { status as grpcStatus } from '@grpc/grpc-js';
import { ensureTemporalFailure } from '@temporalio/common';
import { ensureTemporalFailure, SerializationContext } from '@temporalio/common';
import { withSerializationContext } from '@temporalio/common/lib/converter/serialization-context';
import { encodeErrorToFailure, encodeToPayloads } from '@temporalio/common/lib/internal-non-workflow';
import { filterNullAndUndefined } from '@temporalio/common/lib/internal-workflow';
import { SymbolBasedInstanceOfError } from '@temporalio/common/lib/type-helpers';
Expand Down Expand Up @@ -81,6 +82,7 @@ export interface FullActivityId {
*/
export class AsyncCompletionClient extends BaseClient {
public readonly options: LoadedAsyncCompletionClientOptions;
private context?: SerializationContext;

constructor(options?: AsyncCompletionClientOptions) {
super(options);
Expand All @@ -101,6 +103,20 @@ export class AsyncCompletionClient extends BaseClient {
return this.connection.workflowService;
}

/**
* Return a client instance with all serialization operations bound to `context`.
*/
withContext(context: SerializationContext): AsyncCompletionClient {
const client = new AsyncCompletionClient({
connection: this.connection,
dataConverter: this.dataConverter,
identity: this.options.identity,
namespace: this.options.namespace,
});
client.context = context;
return client;
}

/**
* Transforms grpc errors into well defined TS errors.
*/
Expand All @@ -127,7 +143,10 @@ export class AsyncCompletionClient extends BaseClient {
async complete(fullActivityId: FullActivityId, result: unknown): Promise<void>;

async complete(taskTokenOrFullActivityId: Uint8Array | FullActivityId, result: unknown): Promise<void> {
const payloads = await encodeToPayloads(this.dataConverter, result);
const dataConverter = this.context
? withSerializationContext(this.dataConverter, this.context)
: this.dataConverter;
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@chris-olszewski chris-olszewski Feb 25, 2026

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Might be worth making this snippet a getter to use in complete/fail/reportCancellation/heartbeat.

const payloads = await encodeToPayloads(dataConverter, result);
try {
if (taskTokenOrFullActivityId instanceof Uint8Array) {
await this.workflowService.respondActivityTaskCompleted({
Expand Down Expand Up @@ -159,7 +178,10 @@ export class AsyncCompletionClient extends BaseClient {
async fail(fullActivityId: FullActivityId, err: unknown): Promise<void>;

async fail(taskTokenOrFullActivityId: Uint8Array | FullActivityId, err: unknown): Promise<void> {
const failure = await encodeErrorToFailure(this.dataConverter, ensureTemporalFailure(err));
const dataConverter = this.context
? withSerializationContext(this.dataConverter, this.context)
: this.dataConverter;
const failure = await encodeErrorToFailure(dataConverter, ensureTemporalFailure(err));
try {
if (taskTokenOrFullActivityId instanceof Uint8Array) {
await this.workflowService.respondActivityTaskFailed({
Expand Down Expand Up @@ -191,7 +213,10 @@ export class AsyncCompletionClient extends BaseClient {
reportCancellation(fullActivityId: FullActivityId, details?: unknown): Promise<void>;

async reportCancellation(taskTokenOrFullActivityId: Uint8Array | FullActivityId, details?: unknown): Promise<void> {
const payloads = await encodeToPayloads(this.dataConverter, details);
const dataConverter = this.context
? withSerializationContext(this.dataConverter, this.context)
: this.dataConverter;
const payloads = await encodeToPayloads(dataConverter, details);
try {
if (taskTokenOrFullActivityId instanceof Uint8Array) {
await this.workflowService.respondActivityTaskCanceled({
Expand Down Expand Up @@ -223,7 +248,10 @@ export class AsyncCompletionClient extends BaseClient {
heartbeat(fullActivityId: FullActivityId, details?: unknown): Promise<void>;

async heartbeat(taskTokenOrFullActivityId: Uint8Array | FullActivityId, details?: unknown): Promise<void> {
const payloads = await encodeToPayloads(this.dataConverter, details);
const dataConverter = this.context
? withSerializationContext(this.dataConverter, this.context)
: this.dataConverter;
const payloads = await encodeToPayloads(dataConverter, details);
let cancelRequested = false;
let paused = false;
let reset = false;
Expand Down
10 changes: 7 additions & 3 deletions packages/client/src/schedule-client.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,7 @@ export class ScheduleClient extends BaseClient {
scheduleId: opts.scheduleId,
schedule: {
spec: encodeScheduleSpec(opts.spec),
action: await encodeScheduleAction(this.dataConverter, opts.action, headers),
action: await encodeScheduleAction(this.dataConverter, this.options.namespace, opts.action, headers),
policies: encodeSchedulePolicies(opts.policies),
state: encodeScheduleState(opts.state),
},
Expand Down Expand Up @@ -298,7 +298,7 @@ export class ScheduleClient extends BaseClient {
scheduleId,
schedule: {
spec: encodeScheduleSpec(opts.spec),
action: await encodeScheduleAction(this.dataConverter, opts.action, header),
action: await encodeScheduleAction(this.dataConverter, this.options.namespace, opts.action, header),
policies: encodeSchedulePolicies(opts.policies),
state: encodeScheduleState(opts.state),
},
Expand Down Expand Up @@ -432,7 +432,11 @@ export class ScheduleClient extends BaseClient {
return {
scheduleId,
spec: decodeScheduleSpec(raw.schedule.spec),
action: await decodeScheduleAction(this.client.dataConverter, raw.schedule.action),
action: await decodeScheduleAction(
this.client.dataConverter,
this.client.options.namespace,
raw.schedule.action
),
memo: await decodeMapFromPayloads(this.client.dataConverter, raw.memo?.fields),
searchAttributes: decodeSearchAttributes(raw.searchAttributes?.indexedFields),
typedSearchAttributes: decodeTypedSearchAttributes(raw.searchAttributes?.indexedFields),
Expand Down
25 changes: 18 additions & 7 deletions packages/client/src/schedule-helpers.ts
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Original file line number Diff line number Diff line change
@@ -1,12 +1,14 @@
import Long from 'long';
import {
WorkflowSerializationContext,
compilePriority,
compileRetryPolicy,
decodePriority,
decompileRetryPolicy,
extractWorkflowType,
LoadedDataConverter,
} from '@temporalio/common';
import { withSerializationContext } from '@temporalio/common/lib/converter/serialization-context';
import { encodeUserMetadata, decodeUserMetadata } from '@temporalio/common/lib/internal-non-workflow/codec-helpers';
import {
encodeUnifiedSearchAttributes,
Expand Down Expand Up @@ -247,16 +249,19 @@ export function encodeScheduleSpec(spec: ScheduleSpec): temporal.api.schedule.v1

export async function encodeScheduleAction(
dataConverter: LoadedDataConverter,
namespace: string,
action: CompiledScheduleAction,
headers: Headers
): Promise<temporal.api.schedule.v1.IScheduleAction> {
const context: WorkflowSerializationContext = { namespace, workflowId: action.workflowId };
const contextDataConverter = withSerializationContext(dataConverter, context);
return {
startWorkflow: {
workflowId: action.workflowId,
workflowType: {
name: action.workflowType,
},
input: { payloads: await encodeToPayloads(dataConverter, ...action.args) },
input: { payloads: await encodeToPayloads(contextDataConverter, ...action.args) },
taskQueue: {
kind: temporal.api.enums.v1.TaskQueueKind.TASK_QUEUE_KIND_NORMAL,
name: action.taskQueue,
Expand All @@ -265,15 +270,15 @@ export async function encodeScheduleAction(
workflowRunTimeout: msOptionalToTs(action.workflowRunTimeout),
workflowTaskTimeout: msOptionalToTs(action.workflowTaskTimeout),
retryPolicy: action.retry ? compileRetryPolicy(action.retry) : undefined,
memo: action.memo ? { fields: await encodeMapToPayloads(dataConverter, action.memo) } : undefined,
memo: action.memo ? { fields: await encodeMapToPayloads(contextDataConverter, action.memo) } : undefined,
searchAttributes:
action.searchAttributes || action.typedSearchAttributes // eslint-disable-line @typescript-eslint/no-deprecated
? {
indexedFields: encodeUnifiedSearchAttributes(action.searchAttributes, action.typedSearchAttributes), // eslint-disable-line @typescript-eslint/no-deprecated
}
: undefined,
header: { fields: headers },
userMetadata: await encodeUserMetadata(dataConverter, action.staticSummary, action.staticDetails),
userMetadata: await encodeUserMetadata(contextDataConverter, action.staticSummary, action.staticDetails),
priority: action.priority ? compilePriority(action.priority) : undefined,
},
};
Expand Down Expand Up @@ -321,20 +326,26 @@ export function decodeScheduleSpec(pb: temporal.api.schedule.v1.IScheduleSpec):

export async function decodeScheduleAction(
dataConverter: LoadedDataConverter,
namespace: string,
pb: temporal.api.schedule.v1.IScheduleAction
): Promise<ScheduleDescriptionAction> {
if (pb.startWorkflow) {
const { staticSummary, staticDetails } = await decodeUserMetadata(dataConverter, pb.startWorkflow?.userMetadata);
const workflowId = pb.startWorkflow.workflowId!;
const contextDataConverter = withSerializationContext(dataConverter, { namespace, workflowId });
const { staticSummary, staticDetails } = await decodeUserMetadata(
contextDataConverter,
pb.startWorkflow?.userMetadata
);
return {
type: 'startWorkflow',

workflowId: pb.startWorkflow.workflowId!,
workflowId,

workflowType: pb.startWorkflow.workflowType!.name!,

taskQueue: pb.startWorkflow.taskQueue!.name!,
args: await decodeArrayFromPayloads(dataConverter, pb.startWorkflow.input?.payloads),
memo: await decodeMapFromPayloads(dataConverter, pb.startWorkflow.memo?.fields),
args: await decodeArrayFromPayloads(contextDataConverter, pb.startWorkflow.input?.payloads),
memo: await decodeMapFromPayloads(contextDataConverter, pb.startWorkflow.memo?.fields),
retry: decompileRetryPolicy(pb.startWorkflow.retryPolicy),
searchAttributes: decodeSearchAttributes(pb.startWorkflow.searchAttributes?.indexedFields),
typedSearchAttributes: decodeTypedSearchAttributes(pb.startWorkflow.searchAttributes?.indexedFields),
Expand Down
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