Implement global error handling and automated PII log masking - #456
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This PR introduces a comprehensive diagnostic infrastructure designed to eliminate debugging blind spots in background threads and ensure regulatory compliance by preventing PII/PHI leakage in application logs. ### Rationale and Key Decisions The previous diagnostic implementation suffered from three primary issues: a loss of execution context when errors crossed the Web Worker boundary, a high risk of clinical data exposure in logs, and a fragmented approach to UI error notifications. To address these, I have centralized the error lifecycle: - **Diagnostic Transparency:** By overhauling the Web Worker protocol, we now preserve the original stack trace and capture specific iteration indices during Monte Carlo simulations. This allows developers to pinpoint exactly which simulation iteration failed and why, rather than receiving a generic "Worker Error." - **Data Privacy by Default:** To comply with strict data privacy policies, all `console` calls have been replaced with a centralized `LoggingService`. This service acts as a gatekeeper, automatically identifying and masking sensitive patterns like Subject IDs and clinical strata before they reach any output sink. - **Decoupled Error Reporting:** I implemented a `GlobalErrorHandler` to remove the burden of manual UI notifications from business logic. By moving `Toast` triggers to a global interceptor, we reduce boilerplate and ensure a consistent user experience for all unhandled exceptions. ### Key Changes #### Core Error Handling - **`GlobalErrorHandler`**: Created a centralized handler in `src/app/core/services/global-error-handler.service.ts` that catches unhandled exceptions and triggers UI toasts automatically. - **`LoggingService`**: Implemented a masking service to replace `console.log/error`. It uses regex patterns to sanitize clinical identifiers (PII/PHI) before output. #### Randomization Engine & Web Workers - **Structured Error Protocol**: Updated `worker-protocol.ts` to include `StructuredErrorPayload`, supporting `message`, `stack`, and `context` fields. - **Monte Carlo Iteration Tracking**: Modified the worker simulation to catch errors at the iteration level, reporting the specific index where a failure occurred. - **Facade Cleanup**: Refactored `randomization-engine.facade.ts` to remove manual try-catch blocks and redundant toast calls, allowing errors to propagate to the global handler. #### Cleanup & Compliance - Removed all direct calls to `console.log` and `console.error` across the codebase, including the application entry point (`main.ts`). - Updated existing test suites to assert against the new structured error objects and masking logic.
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📝 WalkthroughSummary by CodeRabbit
WalkthroughCentralizes error handling: adds LoggingService and GlobalErrorHandler, standardizes worker error payloads (StructuredErrorPayload), updates RandomizationEngineFacade to normalize and route errors through ErrorHandler, and adjusts worker emission, bootstrap, and tests. ChangesCentralized Error Handling
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
✨ Simplify code
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| Status | Name | Latest Commit | Updated (UTC) |
|---|---|---|---|
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equipose | 8177148 | Jun 09 2026, 01:24 PM |
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/app/core/services/global-error-handler.service.ts`:
- Around line 21-23: The current branch in global-error-handler.service.ts
assigns message = error.message without guaranteeing it's a string; update the
unknown-error extraction in the error handler (the block handling error &&
typeof error === 'object' && error.message) to check typeof error.message ===
'string' and only assign it directly in that case, otherwise coerce it to a safe
string (e.g., JSON.stringify(error.message) fallback to String(error.message) if
stringify fails) before passing to ToastService.showError; this change should be
applied in the method that constructs `message` prior to calling
ToastService.showError to ensure type safety.
In `@src/app/core/services/logging.service.ts`:
- Around line 31-47: The mask function can infinitely recurse on circular
objects; modify mask (or create an internal helper) to accept and use a WeakSet
(e.g., visited) to track objects/arrays already processed and return a safe
placeholder (or the original reference) when encountering a previously-seen
object to avoid re-entry; keep using maskString for primitive/string masking and
ensure Error handling (the branch creating new Error and masking stack/message)
also passes the visited set so circular stacks/objects won't cause a stack
overflow.
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📒 Files selected for processing (8)
src/app/app.config.tssrc/app/core/services/global-error-handler.service.tssrc/app/core/services/logging.service.tssrc/app/domain/randomization-engine/randomization-engine.facade.spec.tssrc/app/domain/randomization-engine/randomization-engine.facade.tssrc/app/domain/randomization-engine/worker/randomization-engine.worker.tssrc/app/domain/randomization-engine/worker/worker-protocol.tssrc/main.ts
| } else if (error && typeof error === 'object' && error.message) { | ||
| message = error.message; | ||
| } else if (typeof error === 'string') { |
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Harden unknown error message extraction
At lines 21-22, error && typeof error === 'object' && error.message narrows to object but doesn’t guarantee error.message is a string, so message = error.message can pass non-string values into ToastService.showError(message: string).
Proposed fix
- } else if (error && typeof error === 'object' && error.message) {
- message = error.message;
+ } else if (error && typeof error === 'object' && 'message' in error) {
+ const candidate = (error as { message?: unknown }).message;
+ if (typeof candidate === 'string' && candidate.trim().length > 0) {
+ message = candidate;
+ }
} else if (typeof error === 'string') {
message = error;
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| } else if (error && typeof error === 'object' && error.message) { | |
| message = error.message; | |
| } else if (typeof error === 'string') { | |
| } else if (error && typeof error === 'object' && 'message' in error) { | |
| const candidate = (error as { message?: unknown }).message; | |
| if (typeof candidate === 'string' && candidate.trim().length > 0) { | |
| message = candidate; | |
| } | |
| } else if (typeof error === 'string') { |
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@src/app/core/services/global-error-handler.service.ts` around lines 21 - 23,
The current branch in global-error-handler.service.ts assigns message =
error.message without guaranteeing it's a string; update the unknown-error
extraction in the error handler (the block handling error && typeof error ===
'object' && error.message) to check typeof error.message === 'string' and only
assign it directly in that case, otherwise coerce it to a safe string (e.g.,
JSON.stringify(error.message) fallback to String(error.message) if stringify
fails) before passing to ToastService.showError; this change should be applied
in the method that constructs `message` prior to calling ToastService.showError
to ensure type safety.
There was a problem hiding this comment.
I have updated the error handler to ensure type safety. It now checks if the extracted message is a string and, if not, coerces it via JSON.stringify with a fallback to String().
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Skipped: comment is from another GitHub bot.
| private mask(data: unknown): unknown { | ||
| if (typeof data === 'string') { | ||
| return this.maskString(data); | ||
| } | ||
| if (data instanceof Error) { | ||
| const err = new Error(this.maskString(data.message)); | ||
| err.stack = data.stack ? this.maskString(data.stack) : undefined; | ||
| return err; | ||
| } | ||
| if (data && typeof data === 'object') { | ||
| // Create a shallow copy to mutate | ||
| const maskedObj: Record<string, unknown> = Array.isArray(data) ? [] : {}; | ||
| for (const key of Object.keys(data)) { | ||
| maskedObj[key] = this.mask((data as Record<string, unknown>)[key]); | ||
| } | ||
| return maskedObj; | ||
| } |
There was a problem hiding this comment.
Prevent masking from crashing on circular objects
At Line 40, mask() recursively walks objects without tracking visited references. Circular payloads (common in framework errors/events) will recurse indefinitely and can throw Maximum call stack size exceeded, dropping the original error path.
Proposed fix
export class LoggingService {
+ private readonly seen = new WeakSet<object>();
+
private mask(data: unknown): unknown {
if (typeof data === 'string') {
return this.maskString(data);
}
if (data instanceof Error) {
const err = new Error(this.maskString(data.message));
err.stack = data.stack ? this.maskString(data.stack) : undefined;
return err;
}
if (data && typeof data === 'object') {
+ if (this.seen.has(data)) {
+ return '[Circular]';
+ }
+ this.seen.add(data);
// Create a shallow copy to mutate
const maskedObj: Record<string, unknown> = Array.isArray(data) ? [] : {};
for (const key of Object.keys(data)) {
maskedObj[key] = this.mask((data as Record<string, unknown>)[key]);
}
+ this.seen.delete(data);
return maskedObj;
}
return data;
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| private mask(data: unknown): unknown { | |
| if (typeof data === 'string') { | |
| return this.maskString(data); | |
| } | |
| if (data instanceof Error) { | |
| const err = new Error(this.maskString(data.message)); | |
| err.stack = data.stack ? this.maskString(data.stack) : undefined; | |
| return err; | |
| } | |
| if (data && typeof data === 'object') { | |
| // Create a shallow copy to mutate | |
| const maskedObj: Record<string, unknown> = Array.isArray(data) ? [] : {}; | |
| for (const key of Object.keys(data)) { | |
| maskedObj[key] = this.mask((data as Record<string, unknown>)[key]); | |
| } | |
| return maskedObj; | |
| } | |
| private mask(data: unknown): unknown { | |
| if (typeof data === 'string') { | |
| return this.maskString(data); | |
| } | |
| if (data instanceof Error) { | |
| const err = new Error(this.maskString(data.message)); | |
| err.stack = data.stack ? this.maskString(data.stack) : undefined; | |
| return err; | |
| } | |
| if (data && typeof data === 'object') { | |
| if (this.seen.has(data)) { | |
| return '[Circular]'; | |
| } | |
| this.seen.add(data); | |
| // Create a shallow copy to mutate | |
| const maskedObj: Record<string, unknown> = Array.isArray(data) ? [] : {}; | |
| for (const key of Object.keys(data)) { | |
| maskedObj[key] = this.mask((data as Record<string, unknown>)[key]); | |
| } | |
| this.seen.delete(data); | |
| return maskedObj; | |
| } | |
| return data; | |
| } |
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@src/app/core/services/logging.service.ts` around lines 31 - 47, The mask
function can infinitely recurse on circular objects; modify mask (or create an
internal helper) to accept and use a WeakSet (e.g., visited) to track
objects/arrays already processed and return a safe placeholder (or the original
reference) when encountering a previously-seen object to avoid re-entry; keep
using maskString for primitive/string masking and ensure Error handling (the
branch creating new Error and masking stack/message) also passes the visited set
so circular stacks/objects won't cause a stack overflow.
There was a problem hiding this comment.
I modified the mask method to use a WeakSet to track visited objects and arrays. It now returns [Circular Reference] to avoid infinite recursion and correctly passes the visited set during recursive calls.
There was a problem hiding this comment.
Skipped: comment is from another GitHub bot.
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Note Docstrings generation - SUCCESS |
…434-4ba1-818a-7fc91d44d81b` Docstrings generation was requested by @fderuiter. The following files were modified: * `src/app/domain/randomization-engine/worker/randomization-engine.worker.ts` These files were ignored: * `src/app/domain/randomization-engine/randomization-engine.facade.spec.ts`
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@copilot Need you to fix a few things. Please think hard and comprehensively about this and implement the fixes: First off is that my ci/cd is failing and not deploying. Here are the errors I'm getting in cloudflare: 08:24:10.034 Next: Verify each finding against current code. Fix only still-valid issues, skip the Inline comments:
In
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Pull request overview
This PR aims to centralize error handling (including Web Worker failures) and introduce a single logging pathway that masks clinical identifiers before writing to output sinks, with the goal of improving diagnostics while reducing PII/PHI leakage in logs.
Changes:
- Adds an Angular
ErrorHandlerimplementation (GlobalErrorHandler) and wires it into app-level providers for centralized toast + logging. - Introduces a
LoggingServiceintended to replace scatteredconsoleusage while masking sensitive patterns. - Extends the randomization worker protocol and facade to propagate structured errors (message/stack/context) and report Monte Carlo iteration-level failures.
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.
Show a summary per file
| File | Description |
|---|---|
| src/main.ts | Routes bootstrap failures through the new LoggingService. |
| src/app/app.config.ts | Registers GlobalErrorHandler as the app’s ErrorHandler. |
| src/app/core/services/global-error-handler.service.ts | New centralized error handler (toast + masked logging). |
| src/app/core/services/logging.service.ts | New masking logger wrapper intended to sanitize output. |
| src/app/domain/randomization-engine/worker/worker-protocol.ts | Adds structured error payload + Monte Carlo error response type. |
| src/app/domain/randomization-engine/worker/randomization-engine.worker.ts | Emits structured generation errors and iteration-indexed Monte Carlo errors. |
| src/app/domain/randomization-engine/randomization-engine.facade.ts | Converts worker error payloads into Error instances and forwards them to ErrorHandler. |
| src/app/domain/randomization-engine/randomization-engine.facade.spec.ts | Updates worker error payload expectations and stubs ErrorHandler. |
Comments suppressed due to low confidence (1)
src/app/domain/randomization-engine/randomization-engine.facade.spec.ts:277
- The worker-path error tests were updated for the new structured payload, but they don’t assert the new side-effect that errors are routed through
ErrorHandler. SinceErrorHandleris now injected and used for global reporting, please assert it’s invoked for worker generation errors to prevent regressions.
it('should set the error signal and clear isGenerating on GENERATION_ERROR', () => {
facade.generateSchema(mockConfig);
const { id } = fakeWorker.postMessage.mock.calls[0][0] as { id: string };
fakeWorker.simulateMessage({
id,
type: 'GENERATION_ERROR',
payload: { message: 'Worker error' }
});
expect(facade.error()).toBe('Worker error');
expect(facade.isGenerating()).toBe(false);
expect(facade.results()).toBeNull();
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| let message = 'An unexpected error occurred.'; | ||
| if (error instanceof Error) { | ||
| message = error.message; | ||
| } else if (error && typeof error === 'object' && error.message) { | ||
| message = error.message; |
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I added an 'message' in error check and safely extracted the message to ensure it complies with TypeScript strict mode, along with proper string checks.
| private mask(data: unknown): unknown { | ||
| if (typeof data === 'string') { | ||
| return this.maskString(data); | ||
| } | ||
| if (data instanceof Error) { | ||
| const err = new Error(this.maskString(data.message)); | ||
| err.stack = data.stack ? this.maskString(data.stack) : undefined; | ||
| return err; | ||
| } | ||
| if (data && typeof data === 'object') { | ||
| // Create a shallow copy to mutate | ||
| const maskedObj: Record<string, unknown> = Array.isArray(data) ? [] : {}; | ||
| for (const key of Object.keys(data)) { | ||
| maskedObj[key] = this.mask((data as Record<string, unknown>)[key]); | ||
| } | ||
| return maskedObj; | ||
| } | ||
| return data; | ||
| } |
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The mask function has been updated to accept a visited WeakSet to prevent infinite recursion, compile correctly under strict typing for objects vs arrays, and safely copy custom properties on Error instances so we don't drop important context like iterationIndex.
| /** | ||
| * Masks sensitive clinical identifiers before logging. | ||
| * - Masks SUBJ- followed by alphanumeric characters. | ||
| * - Masks Stratum codes like AGE=<something>. We need a general approach for strata? | ||
| * "replacing matches with masked values" | ||
| */ |
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I have removed the conversational and internal reasoning comments to ensure the logging service is concise and action-oriented.
| // Actually we shouldn't use console.log directly, wait. We can use it but maybe standardise. Wait, Requirement says "The application contains no direct calls to console.log or console.error". It means replace all direct calls. | ||
| // Wait! Can I use console.log IN the logging service? "All direct console calls must be replaced by the new logging service to ensure uniform sanitization [cite:source8]." It implies the logging service itself is allowed to use console.log/console.error, or something else. | ||
| // Yes, the LoggingService acts as the wrapper. |
| log(message: unknown, ...optionalParams: unknown[]): void { | ||
| const maskedMessage = this.mask(message); | ||
| const maskedParams = optionalParams.map(p => this.mask(p)); | ||
| // Actually we shouldn't use console.log directly, wait. We can use it but maybe standardise. Wait, Requirement says "The application contains no direct calls to console.log or console.error". It means replace all direct calls. | ||
| // Wait! Can I use console.log IN the logging service? "All direct console calls must be replaced by the new logging service to ensure uniform sanitization [cite:source8]." It implies the logging service itself is allowed to use console.log/console.error, or something else. |
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I have completely removed or replaced the remaining direct console.log and console.error calls across the codebase, ensuring the compliance requirement is fully met.
| expect(facade.error()).toBe('Worker Error'); | ||
| }); |
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I added assertions in both tests to verify that mockErrorHandler.handleError is correctly called, ensuring the global error path is fully covered.
| expect(facade.error()).toBe('fatal worker crash'); | ||
| expect(facade.isGenerating()).toBe(false); | ||
| expect(pendingCallbacks().size).toBe(0); | ||
| }); |
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I added the assertion to ensure ErrorHandler.handleError is called as expected here too.
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Verify each finding against current code. Fix only still-valid issues, skip the Inline comments:
In
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This PR introduces a comprehensive diagnostic infrastructure designed to eliminate debugging blind spots in background threads and ensure regulatory compliance by preventing PII/PHI leakage in application logs.
Rationale and Key Decisions
The previous diagnostic implementation suffered from three primary issues: a loss of execution context when errors crossed the Web Worker boundary, a high risk of clinical data exposure in logs, and a fragmented approach to UI error notifications.
To address these, I have centralized the error lifecycle:
consolecalls have been replaced with a centralizedLoggingService. This service acts as a gatekeeper, automatically identifying and masking sensitive patterns like Subject IDs and clinical strata before they reach any output sink.GlobalErrorHandlerto remove the burden of manual UI notifications from business logic. By movingToasttriggers to a global interceptor, we reduce boilerplate and ensure a consistent user experience for all unhandled exceptions.Key Changes
Core Error Handling
GlobalErrorHandler: Created a centralized handler insrc/app/core/services/global-error-handler.service.tsthat catches unhandled exceptions and triggers UI toasts automatically.LoggingService: Implemented a masking service to replaceconsole.log/error. It uses regex patterns to sanitize clinical identifiers (PII/PHI) before output.Randomization Engine & Web Workers
worker-protocol.tsto includeStructuredErrorPayload, supportingmessage,stack, andcontextfields.randomization-engine.facade.tsto remove manual try-catch blocks and redundant toast calls, allowing errors to propagate to the global handler.Cleanup & Compliance
console.logandconsole.erroracross the codebase, including the application entry point (main.ts).