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feat(cockpit): Tier 3 — time-travel checkpoint nav + durable-execution step pipeline #22

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Merged
blove merged 1 commit into from
Apr 6, 2026
Merged

feat(cockpit): Tier 3 — time-travel checkpoint nav + durable-execution step pipeline #22

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132 changes: 62 additions & 70 deletions cockpit/langgraph/durable-execution/angular/src/app/durable-execution.component.ts
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Original file line number Diff line number Diff line change
@@ -1,96 +1,88 @@
import { Component } from '@angular/core';
import { LegacyChatComponent } from '@cacheplane/chat';
// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
import { Component, computed } from '@angular/core';
import { ChatComponent } from '@cacheplane/chat';
import { streamResource } from '@cacheplane/stream-resource';
import { environment } from '../environments/environment';

/**
* DurableExecutionComponent demonstrates fault-tolerant multi-step execution
* with `streamResource()`.
*
* This example shows how a graph checkpoints at each node, enabling it to
* resume after failures. The sidebar shows execution status in real time:
* - `stream.status()` as a badge (idle/loading/resolved/error)
* - `stream.hasValue()` indicator for received data
* - A "Retry" button that calls `stream.reload()` when `stream.error()` is set
*
* The backend processes each request through three nodes:
* analyze → plan → generate
* Each node updates `state.step` so the UI can track progress.
*/
@Component({
selector: 'app-durable-execution',
standalone: true,
imports: [LegacyChatComponent],
imports: [ChatComponent],
template: `
<cp-chat
[messages]="stream.messages()"
[isLoading]="stream.isLoading()"
[error]="stream.error()"
(sendMessage)="send($event)">
<ng-template #sidebar>
<h3 style="font-size: 0.8rem; font-weight: 600; margin-bottom: 0.75rem; color: #1a1a2e;">Execution Status</h3>

<div style="margin-bottom: 0.75rem;">
<span style="font-size: 0.7rem; font-weight: 500; color: #555770; text-transform: uppercase; letter-spacing: 0.05em;">Status</span>
<div style="margin-top: 4px;">
<span [style.background]="statusBadgeColor()" style="display: inline-block; padding: 3px 8px; border-radius: 10px; font-size: 0.72rem; font-weight: 600; color: #fff; font-family: monospace;">
{{ stream.status() }}
</span>
</div>
</div>

<div style="margin-bottom: 0.75rem;">
<span style="font-size: 0.7rem; font-weight: 500; color: #555770; text-transform: uppercase; letter-spacing: 0.05em;">Data Received</span>
<div style="margin-top: 4px; display: flex; align-items: center; gap: 6px;">
<span [style.background]="stream.hasValue() ? '#22c55e' : '#d1d5db'"
style="display: inline-block; width: 10px; height: 10px; border-radius: 50%;"></span>
<span style="font-size: 0.8rem; color: #1a1a2e;">{{ stream.hasValue() ? 'Yes' : 'No' }}</span>
</div>
<div class="flex flex-col h-screen">
<!-- Status bar -->
<div class="flex items-center gap-4 px-5 py-3 border-b"
style="border-color: var(--chat-border, #333); background: var(--chat-bg-alt, #222);">
<!-- Step pipeline -->
<div class="flex items-center gap-2 text-xs">
@for (step of steps; track step) {
<div class="flex items-center gap-1">
<span class="w-2 h-2 rounded-full"
[style.background]="currentStep() === step ? 'var(--chat-warning-text, #fbbf24)' : isStepComplete(step) ? 'var(--chat-success, #4ade80)' : 'var(--chat-text-muted, #777)'">
</span>
<span [style.color]="currentStep() === step ? 'var(--chat-text, #e0e0e0)' : 'var(--chat-text-muted, #777)'"
[style.font-weight]="currentStep() === step ? '600' : '400'">
{{ step }}
</span>
</div>
@if (!$last) {
<span style="color: var(--chat-text-muted, #777);">→</span>
}
}
</div>

@if (stream.error()) {
<div style="margin-top: 0.75rem; padding: 8px; background: rgba(239,68,68,0.08); border: 1px solid rgba(239,68,68,0.2); border-radius: 6px;">
<div style="font-size: 0.72rem; color: #dc2626; margin-bottom: 6px; font-weight: 600;">Execution Failed</div>
<button (click)="stream.reload()"
style="width: 100%; padding: 6px 10px; background: #dc2626; color: #fff; border: none; border-radius: 4px; cursor: pointer; font-size: 0.75rem; font-weight: 600;">
<!-- Status badge -->
<div class="ml-auto flex items-center gap-3 text-xs">
<span class="px-2 py-0.5 rounded-full font-medium"
[style.background]="statusColor()"
style="color: white;">
{{ stream.status() }}
</span>
@if (stream.error()) {
<button class="px-2 py-1 rounded text-xs font-medium transition-colors"
style="background: var(--chat-error-bg, #2d1515); color: var(--chat-error-text, #f87171);"
(click)="stream.reload()">
Retry
</button>
</div>
}
</ng-template>
</cp-chat>
}
</div>
</div>

<!-- Chat -->
<chat [ref]="stream" class="flex-1 min-w-0" />
</div>
`,
})
export class DurableExecutionComponent {
/**
* The streaming resource backing this durable-execution demo.
*
* The graph runs three nodes (analyze → plan → generate), checkpointing
* after each one. If the graph fails partway through, `stream.reload()`
* re-submits the last input so the run can resume from the last checkpoint.
*/
protected readonly steps = ['analyze', 'plan', 'generate'];

protected readonly stream = streamResource({
apiUrl: environment.langGraphApiUrl,
assistantId: environment.streamingAssistantId,
});

/**
* Submit a message to be processed through the multi-node graph.
*/
send(text: string): void {
this.stream.submit({ messages: [{ role: 'human', content: text }] });
protected readonly currentStep = computed(() => {
const val = this.stream.value() as Record<string, unknown>;
return (val?.['step'] as string) ?? '';
});

protected isStepComplete(step: string): boolean {
const idx = this.steps.indexOf(step);
const currentIdx = this.steps.indexOf(this.currentStep());
return currentIdx > idx;
}

/**
* Returns a colour for the status badge based on the current stream status.
*/
statusBadgeColor(): string {
protected statusColor(): string {
switch (this.stream.status()) {
case 'loading':
case 'reloading': return '#2563eb';
case 'resolved': return '#16a34a';
case 'error': return '#dc2626';
default: return '#6b7280';
case 'reloading':
return '#2563eb';
case 'resolved':
return '#16a34a';
case 'error':
return '#dc2626';
default:
return '#6b7280';
}
}
}
87 changes: 23 additions & 64 deletions cockpit/langgraph/time-travel/angular/src/app/time-travel.component.ts
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Original file line number Diff line number Diff line change
@@ -1,84 +1,43 @@
// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
import { Component } from '@angular/core';
import { LegacyChatComponent } from '@cacheplane/chat';
import { ChatComponent, ChatTimelineSliderComponent } from '@cacheplane/chat';
import { streamResource } from '@cacheplane/stream-resource';
import { environment } from '../environments/environment';

/**
* TimeTravelComponent demonstrates replaying and branching conversation history.
*
* Key integration points:
* - `stream.history()` — array of ThreadState snapshots
* - `stream.branch()` — current branch identifier
* - `stream.setBranch(id)` — switch to a different checkpoint
*/
@Component({
selector: 'app-time-travel',
standalone: true,
imports: [LegacyChatComponent],
imports: [ChatComponent, ChatTimelineSliderComponent],
template: `
<cp-chat
[messages]="stream.messages()"
[isLoading]="stream.isLoading()"
[error]="stream.error()"
(sendMessage)="send($event)">
<ng-template #sidebar>
<h3 style="font-size: 0.8rem; font-weight: 600; margin-bottom: 0.75rem; color: #1a1a2e;">History</h3>
@for (state of stream.history(); track $index) {
<button
(click)="selectCheckpoint(state)"
[style.color]="state.checkpoint_id === stream.branch() ? '#004090' : '#555770'"
[style.background]="state.checkpoint_id === stream.branch() ? 'rgba(0,64,144,0.06)' : 'transparent'"
style="display: block; width: 100%; text-align: left; padding: 6px 8px; border: none; cursor: pointer; font-size: 0.75rem; border-radius: 4px; font-family: monospace; margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;">
{{ formatCheckpoint(state) }}
</button>
}
@if (stream.history().length === 0) {
<p style="font-size: 0.75rem; color: #888; margin: 0;">No history yet. Send a message to begin.</p>
}
</ng-template>
</cp-chat>
<div class="flex h-screen">
<chat [ref]="stream" class="flex-1 min-w-0" />
<aside class="w-80 shrink-0 border-l overflow-y-auto"
style="border-color: var(--chat-border, #333); background: var(--chat-bg, #171717);">
<div class="p-4">
<h3 class="text-xs font-semibold uppercase tracking-wide mb-3"
style="color: var(--chat-text-muted, #777);">Time Travel</h3>
<chat-timeline-slider
[ref]="stream"
(replayRequested)="onReplay($event)"
(forkRequested)="onFork($event)"
/>
</div>
</aside>
</div>
`,
})
export class TimeTravelComponent {
/**
* The streaming resource with checkpointing enabled.
*
* `stream.history()` provides an array of ThreadState snapshots for
* the current thread. `stream.branch()` tracks the active checkpoint.
* Call `stream.setBranch(checkpointId)` to replay from a past state.
*/
protected readonly stream = streamResource({
apiUrl: environment.langGraphApiUrl,
assistantId: environment.streamingAssistantId,
});

/**
* Submit a message to the current thread.
*/
send(text: string): void {
this.stream.submit({ messages: [{ role: 'human', content: text }] });
protected onReplay(checkpointId: string): void {
this.stream.setBranch(checkpointId);
}

/**
* Branch the conversation from the selected checkpoint.
* After calling setBranch, the next submit will fork from that point.
*/
selectCheckpoint(state: { checkpoint_id?: string }): void {
if (state.checkpoint_id) {
this.stream.setBranch(state.checkpoint_id);
}
}

/**
* Format a checkpoint for display in the sidebar.
*/
formatCheckpoint(state: { checkpoint_id?: string; created_at?: string }): string {
const id = state.checkpoint_id ?? 'unknown';
const short = id.substring(0, 8);
if (state.created_at) {
const ts = new Date(state.created_at).toLocaleTimeString();
return `${short}... @ ${ts}`;
}
return `${short}...`;
protected onFork(checkpointId: string): void {
this.stream.setBranch(checkpointId);
// Fork: set branch, then next submit creates a new branch from this point
}
}
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