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feat(frontend): add real-time SSE log streaming with LiveLogViewer, fixes #329 #397

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feat(frontend): add real-time SSE log streaming with LiveLogViewer, fixes #329 #397

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17db115
feat(frontend): add real-time SSE log streaming with LiveLogViewer, s…
samarthsugandhi May 28, 2026
3699181
test(frontend): add LiveLogViewer unit tests for stdout, stderr, filt…
samarthsugandhi May 31, 2026
464816b
fix(test): correct LiveLogViewer import path to src/components
samarthsugandhi May 31, 2026
f500ceb
fix(LiveLogViewer): guard scrollIntoView for jsdom test environment
samarthsugandhi May 31, 2026
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127 changes: 127 additions & 0 deletions frontend/src/components/LiveLogViewer.tsx
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Original file line number Diff line number Diff line change
@@ -0,0 +1,127 @@
import React, { useEffect, useRef, useState, useCallback } from 'react'

export interface LogLine {
line: string
stream: 'stdout' | 'stderr'
ts: number
}

interface LiveLogViewerProps {
lines: LogLine[]
isLive: boolean
onCopy: () => void
copied: boolean
}

export default function LiveLogViewer({ lines, isLive, onCopy, copied }: LiveLogViewerProps) {
const bottomRef = useRef<HTMLDivElement>(null)
const containerRef = useRef<HTMLDivElement>(null)
const [paused, setPaused] = useState(false)
const [filter, setFilter] = useState('')

// Auto-scroll when new lines arrive unless paused
useEffect(() => {
if (!paused && bottomRef.current && typeof bottomRef.current.scrollIntoView === 'function') {
bottomRef.current.scrollIntoView({ behavior: 'smooth' })
}
}, [lines, paused])
const filteredLines = filter
? lines.filter(l => l.line.toLowerCase().includes(filter.toLowerCase()))
: lines

const stderrCount = lines.filter(l => l.stream === 'stderr').length

return (
<div className="space-y-3">
{/* Toolbar */}
<div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
<div className="flex items-center gap-3">
{/* Live indicator */}
{isLive && (
<div className="flex items-center gap-2">
<span className="relative flex h-2 w-2">
<span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-rag-green opacity-75"></span>
<span className="relative inline-flex rounded-full h-2 w-2 bg-rag-green"></span>
</span>
<span className="text-[10px] font-black uppercase tracking-[0.28em] text-rag-green italic">
Live_Stream
</span>
</div>
)}
{/* Stderr warning */}
{stderrCount > 0 && (
<span className="text-[10px] font-black uppercase tracking-[0.2em] text-rag-amber px-2 py-0.5 border border-rag-amber/30 bg-rag-amber/10">
{stderrCount} Stderr
</span>
)}
<span className="text-[10px] uppercase tracking-[0.2em] text-silver/40">
{filteredLines.length} lines
</span>
</div>

<div className="flex flex-wrap gap-2">
<input
value={filter}
onChange={e => setFilter(e.target.value)}
placeholder="Filter output..."
className="bg-black/30 border border-white/10 px-3 py-2 text-sm text-silver-bright outline-none min-w-[180px] placeholder:text-silver/30"
/>
<button
onClick={() => setPaused(p => !p)}
className={`border px-3 py-2 text-[10px] uppercase tracking-[0.2em] font-black transition-colors ${
paused
? 'border-rag-amber/40 text-rag-amber bg-rag-amber/10'
: 'border-white/10 text-silver/75 hover:bg-white/[0.04]'
}`}
>
{paused ? 'Resume_Scroll' : 'Pause_Scroll'}
</button>
<button
onClick={onCopy}
className="border border-white/10 px-3 py-2 text-[10px] uppercase tracking-[0.2em] text-silver/75 font-black hover:bg-white/[0.04] transition-colors"
>
{copied ? 'Copied' : 'Copy_Log'}
</button>
</div>
</div>

{/* Log window */}
<div
ref={containerRef}
className="border border-white/6 bg-black/40 p-4 h-[420px] overflow-y-auto font-mono text-[11px] leading-6 custom-scrollbar"
>
{filteredLines.length === 0 ? (
<div className="flex items-center justify-center h-full">
<p className="text-silver/30 uppercase tracking-[0.3em] text-[10px] italic">
{isLive ? 'Awaiting_Output...' : 'No_Output_Available'}
</p>
</div>
) : (
filteredLines.map((l, i) => (
<div key={i} className="flex gap-3 group hover:bg-white/[0.02] px-1">
{/* Line number */}
<span className="text-silver/15 select-none w-8 text-right shrink-0 group-hover:text-silver/30 transition-colors">
{i + 1}
</span>
{/* Stream badge */}
<span className={`shrink-0 text-[9px] font-black uppercase w-10 pt-[2px] ${
l.stream === 'stderr' ? 'text-rag-amber/70' : 'text-silver/20'
}`}>
{l.stream === 'stderr' ? 'ERR' : 'OUT'}
</span>
{/* Content */}
<span className={`break-all whitespace-pre-wrap ${
l.stream === 'stderr'
? 'text-rag-amber/85'
: 'text-silver/80'
}`}>
{l.line}
</span>
</div>
))
)}
<div ref={bottomRef} />
</div>
</div>
)
}
149 changes: 106 additions & 43 deletions frontend/src/pages/TaskDetails.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ import {
CartesianGrid
} from 'recharts'
import { useToast } from '../components/ToastContext'
import LiveLogViewer, { LogLine } from '../components/LiveLogViewer'

interface Task {
task_id: string
Expand Down Expand Up @@ -201,6 +202,9 @@ export default function TaskDetails() {
const [result, setResult] = useState<TaskResult | null>(null)
const [schema, setSchema] = useState<PluginSchemaResponse | null>(null)
const [rawOutput, setRawOutput] = useState<string>('')
const [logLines, setLogLines] = useState<LogLine[]>([])
const [isStreaming, setIsStreaming] = useState(false)
const [copiedLog, setCopiedLog] = useState(false)
const [loading, setLoading] = useState(true)
const [error, setError] = useState<string | null>(null)
const [scanPhase, setScanPhase] = useState<string | null>(null)
Expand Down Expand Up @@ -363,6 +367,7 @@ export default function TaskDetails() {
loadTask()

const es = new EventSource(`${API_BASE}/task/${taskId}/stream`)
setIsStreaming(true)

es.addEventListener('status', (e) => {
try {
Expand All @@ -371,12 +376,22 @@ export default function TaskDetails() {
if (data.scan_phase) {
setScanPhase(data.scan_phase)
}

// Surface sandbox violation as a distinct status label
if (data.termination_reason) {
setTask((prev: Task | null) => prev
? { ...prev, status: `terminated:${data.termination_reason}` }
: null
)
}

if (['completed', 'failed', 'cancelled'].includes(data.status)) {
es.close()
setIsStreaming(false)
loadTask()
}
} catch (err) {
console.error("Status stream error", err)
console.error('Status stream error', err)
}
})

Expand All @@ -392,18 +407,41 @@ export default function TaskDetails() {
es.addEventListener('output', (e) => {
try {
const data = JSON.parse(e.data)
setRawOutput(prev => prev + data.chunk)
// Support both legacy chunk format and structured line format
const line: string = data.line ?? data.chunk ?? ''
const stream: 'stdout' | 'stderr' = data.stream === 'stderr' ? 'stderr' : 'stdout'
const ts: number = data.ts ?? Date.now()

if (line) {
setLogLines(prev => [...prev, { line, stream, ts }])
// Keep rawOutput in sync for the existing copy/filter logic
setRawOutput(prev => prev + line + '\n')
}
} catch (err) {
console.error("Output stream error", err)
console.error('Output stream error', err)
}
})

es.onerror = (err) => {
console.error("EventSource error:", err)
es.addEventListener('done', () => {
es.close()
setIsStreaming(false)
loadTask()
})

es.addEventListener('error_event', () => {
es.close()
setIsStreaming(false)
})

es.onerror = () => {
es.close()
setIsStreaming(false)
}

return () => es.close()
return () => {
es.close()
setIsStreaming(false)
}
}, [taskId])

async function loadTask() {
Expand Down Expand Up @@ -678,6 +716,17 @@ export default function TaskDetails() {
}
}

const copyLog = async () => {
try {
const text = logLines.map(l => l.line).join('\n') || rawOutput || result?.raw_output || ''
await navigator.clipboard.writeText(text)
setCopiedLog(true)
window.setTimeout(() => setCopiedLog(false), 1500)
} catch (err) {
console.error('Failed to copy log', err)
}
}


const DetailCard = ({ label, value, subValue }: { label: string, value: string, subValue?: string }) => (
<div className="bg-charcoal border border-white/5 p-5 shadow-[0_0_0_1px_rgba(255,255,255,0.02)] min-h-[118px] flex flex-col justify-between">
Expand Down Expand Up @@ -1155,46 +1204,60 @@ export default function TaskDetails() {
className="space-y-6"
>
<motion.div variants={itemVariants} className="border border-white/8 bg-charcoal p-6">
<div className="flex flex-col gap-4 mb-5">
<div className="flex items-center gap-4">
<h3 className="text-xs font-black text-silver-bright uppercase tracking-[0.36em] italic">Raw Output</h3>
<div className="h-px flex-1 bg-white/8" />
</div>
<div className="flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
<div className="flex flex-col sm:flex-row gap-3 sm:items-center">
<input
value={rawSearch}
onChange={(e) => setRawSearch(e.target.value)}
placeholder="Filter raw output"
className="bg-black/30 border border-white/10 px-3 py-2 text-sm text-silver-bright outline-none min-w-[240px]"
/>
<span className="text-[10px] uppercase tracking-[0.2em] text-silver/40">
{filteredRawLines.length} lines
</span>
<div className="flex items-center gap-4 mb-5">
<h3 className="text-xs font-black text-silver-bright uppercase tracking-[0.36em] italic">
Raw Output
</h3>
<div className="h-px flex-1 bg-white/8" />
</div>

{/* Live log viewer — shown when streaming or log lines exist */}
{(isStreaming || logLines.length > 0) ? (
<LiveLogViewer
lines={logLines}
isLive={isStreaming}
onCopy={copyLog}
copied={copiedLog}
/>
) : (
/* Fallback static viewer for completed tasks loaded from result */
<div className="space-y-3">
<div className="flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
<div className="flex flex-col sm:flex-row gap-3 sm:items-center">
<input
value={rawSearch}
onChange={(e) => setRawSearch(e.target.value)}
placeholder="Filter raw output"
className="bg-black/30 border border-white/10 px-3 py-2 text-sm text-silver-bright outline-none min-w-[240px]"
/>
<span className="text-[10px] uppercase tracking-[0.2em] text-silver/40">
{filteredRawLines.length} lines
</span>
</div>
<div className="flex gap-3">
<button
onClick={() => setWrapRawOutput(prev => !prev)}
className="border border-white/10 px-3 py-2 text-[10px] uppercase tracking-[0.2em] text-silver/75 font-black"
>
{wrapRawOutput ? 'Disable Wrap' : 'Enable Wrap'}
</button>
<button
onClick={copyRaw}
className="border border-white/10 px-3 py-2 text-[10px] uppercase tracking-[0.2em] text-silver/75 font-black"
>
{copiedRawOutput ? 'Copied' : 'Copy Output'}
</button>
</div>
</div>
<div className="flex gap-3">
<button
onClick={() => setWrapRawOutput(prev => !prev)}
className="border border-white/10 px-3 py-2 text-[10px] uppercase tracking-[0.2em] text-silver/75 font-black"
>
{wrapRawOutput ? 'Disable Wrap' : 'Enable Wrap'}
</button>
<button
onClick={copyRaw}
className="border border-white/10 px-3 py-2 text-[10px] uppercase tracking-[0.2em] text-silver/75 font-black"
>
{copiedRawOutput ? 'Copied' : 'Copy Output'}
</button>
<div className="border border-white/6 bg-black/30 p-4 max-h-[720px] overflow-auto">
<pre className={`${wrapRawOutput ? 'whitespace-pre-wrap break-words' : 'whitespace-pre'} text-[11px] leading-6 font-mono text-silver/75`}>
{filteredRawLines.length > 0
? filteredRawLines.join('\n')
: 'No matching raw output lines.'}
</pre>
</div>
</div>
</div>
<div className="border border-white/6 bg-black/30 p-4 max-h-[720px] overflow-auto">
<pre className={`${wrapRawOutput ? 'whitespace-pre-wrap break-words' : 'whitespace-pre'} text-[11px] leading-6 font-mono text-silver/75`}>
{filteredRawLines.length > 0
? filteredRawLines.join('\n')
: 'No matching raw output lines.'}
</pre>
</div>
)}
</motion.div>
</motion.section>
)}
Expand Down
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