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* Advanced Observability System
* Distributed tracing, metrics, and logging
*/
export interface Trace {
traceId: string;
spanId: string;
parentSpanId?: string;
operation: string;
startTime: Date;
endTime?: Date;
duration?: number;
status: 'success' | 'error' | 'pending';
tags: Record<string, any>;
logs: Array<{ timestamp: Date; message: string; level: string }>;
}
export interface Metric {
name: string;
value: number;
type: 'counter' | 'gauge' | 'histogram';
timestamp: Date;
tags: Record<string, string>;
}
export class ObservabilitySystem {
private traces: Map<string, Trace[]> = new Map();
private metrics: Metric[] = [];
private activeSpans: Map<string, Trace> = new Map();
/**
* Start a new trace span
*/
startSpan(operation: string, parentSpanId?: string): string {
const spanId = this.generateId();
const traceId = parentSpanId
? this.findTraceId(parentSpanId)
: this.generateId();
const span: Trace = {
traceId,
spanId,
parentSpanId,
operation,
startTime: new Date(),
status: 'pending',
tags: {},
logs: [],
};
this.activeSpans.set(spanId, span);
if (!this.traces.has(traceId)) {
this.traces.set(traceId, []);
}
this.traces.get(traceId)!.push(span);
return spanId;
}
/**
* End a trace span
*/
endSpan(spanId: string, status: 'success' | 'error' = 'success'): void {
const span = this.activeSpans.get(spanId);
if (!span) return;
span.endTime = new Date();
span.duration = span.endTime.getTime() - span.startTime.getTime();
span.status = status;
this.activeSpans.delete(spanId);
}
/**
* Add tags to a span
*/
addTags(spanId: string, tags: Record<string, any>): void {
const span = this.activeSpans.get(spanId);
if (span) {
span.tags = { ...span.tags, ...tags };
}
}
/**
* Add log to a span
*/
addLog(spanId: string, message: string, level: string = 'info'): void {
const span = this.activeSpans.get(spanId);
if (span) {
span.logs.push({
timestamp: new Date(),
message,
level,
});
}
}
/**
* Record a metric
*/
recordMetric(
name: string,
value: number,
type: Metric['type'] = 'gauge',
tags: Record<string, string> = {}
): void {
this.metrics.push({
name,
value,
type,
timestamp: new Date(),
tags,
});
// Keep only last 10000 metrics
if (this.metrics.length > 10000) {
this.metrics.shift();
}
}
/**
* Get trace by ID
*/
getTrace(traceId: string): Trace[] | undefined {
return this.traces.get(traceId);
}
/**
* Get metrics by name
*/
getMetrics(name: string, since?: Date): Metric[] {
let filtered = this.metrics.filter(m => m.name === name);
if (since) {
filtered = filtered.filter(m => m.timestamp >= since);
}
return filtered;
}
/**
* Get aggregated metrics
*/
getAggregatedMetrics(
name: string,
aggregation: 'sum' | 'avg' | 'min' | 'max' | 'count',
since?: Date
): number {
const metrics = this.getMetrics(name, since);
if (metrics.length === 0) return 0;
switch (aggregation) {
case 'sum':
return metrics.reduce((sum, m) => sum + m.value, 0);
case 'avg':
return metrics.reduce((sum, m) => sum + m.value, 0) / metrics.length;
case 'min':
return Math.min(...metrics.map(m => m.value));
case 'max':
return Math.max(...metrics.map(m => m.value));
case 'count':
return metrics.length;
default:
return 0;
}
}
/**
* Get slow traces (duration > threshold)
*/
getSlowTraces(thresholdMs: number = 1000): Trace[] {
const allTraces = Array.from(this.traces.values()).flat();
return allTraces.filter(trace =>
trace.duration && trace.duration > thresholdMs
);
}
/**
* Get error traces
*/
getErrorTraces(): Trace[] {
const allTraces = Array.from(this.traces.values()).flat();
return allTraces.filter(trace => trace.status === 'error');
}
/**
* Generate observability dashboard data
*/
getDashboardData(): {
totalTraces: number;
activeSpans: number;
errorRate: number;
avgDuration: number;
slowTraces: number;
topOperations: Array<{ operation: string; count: number }>;
} {
const allTraces = Array.from(this.traces.values()).flat();
const completedTraces = allTraces.filter(t => t.endTime);
const errorTraces = allTraces.filter(t => t.status === 'error');
const avgDuration = completedTraces.length > 0
? completedTraces.reduce((sum, t) => sum + (t.duration || 0), 0) / completedTraces.length
: 0;
// Count operations
const operationCounts = new Map<string, number>();
allTraces.forEach(trace => {
operationCounts.set(trace.operation, (operationCounts.get(trace.operation) || 0) + 1);
});
const topOperations = Array.from(operationCounts.entries())
.map(([operation, count]) => ({ operation, count }))
.sort((a, b) => b.count - a.count)
.slice(0, 10);
return {
totalTraces: allTraces.length,
activeSpans: this.activeSpans.size,
errorRate: completedTraces.length > 0 ? errorTraces.length / completedTraces.length : 0,
avgDuration,
slowTraces: this.getSlowTraces().length,
topOperations,
};
}
private generateId(): string {
return `${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}
private findTraceId(spanId: string): string {
for (const [traceId, spans] of this.traces.entries()) {
if (spans.some(s => s.spanId === spanId)) {
return traceId;
}
}
return this.generateId();
}
}
export const observabilitySystem = new ObservabilitySystem();
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