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/**
* BaseCallback - Abstract callback handler
*/
export class BaseCallback {
/**
* Called when a Runnable starts
*/
async onStart(runnable, input, config) {
// Override in subclass
}
/**
* Called when a Runnable completes successfully
*/
async onEnd(runnable, output, config) {
// Override in subclass
}
/**
* Called when a Runnable errors
*/
async onError(runnable, error, config) {
// Override in subclass
}
/**
* Called for LLM token streaming
*/
async onLLMNewToken(token, config) {
// Override in subclass
}
/**
* Called when a chain step completes
*/
async onChainStep(stepName, output, config) {
// Override in subclass
}
}
/**
* ConsoleCallback - Logs to console
*/
export class ConsoleCallback extends BaseCallback {
constructor(options = {}) {
super();
this.verbose = options.verbose ?? true;
this.colors = options.colors ?? true;
}
async onStart(runnable, input, config) {
if (this.verbose) {
console.log(`\n▶ Starting: ${runnable.name}`);
console.log(` Input:`, this._format(input));
}
}
async onEnd(runnable, output, config) {
if (this.verbose) {
console.log(`✓ Completed: ${runnable.name}`);
console.log(` Output:`, this._format(output));
}
}
async onError(runnable, error, config) {
console.error(`✗ Error in ${runnable.name}:`, error.message);
}
async onLLMNewToken(token, config) {
process.stdout.write(token);
}
_format(value) {
if (typeof value === 'string') {
return value.length > 100 ? value.substring(0, 97) + '...' : value;
}
return JSON.stringify(value, null, 2);
}
}
/**
* MetricsCallback - Tracks timing and counts
*/
export class MetricsCallback extends BaseCallback {
constructor() {
super();
this.metrics = {
calls: {},
totalTime: {},
errors: {}
};
this.startTimes = new Map();
}
async onStart(runnable, input, config) {
const name = runnable.name;
this.startTimes.set(name, Date.now());
this.metrics.calls[name] = (this.metrics.calls[name] || 0) + 1;
}
async onEnd(runnable, output, config) {
const name = runnable.name;
const startTime = this.startTimes.get(name);
if (startTime) {
const duration = Date.now() - startTime;
this.metrics.totalTime[name] = (this.metrics.totalTime[name] || 0) + duration;
this.startTimes.delete(name);
}
}
async onError(runnable, error, config) {
const name = runnable.name;
this.metrics.errors[name] = (this.metrics.errors[name] || 0) + 1;
}
getReport() {
const report = [];
for (const [name, calls] of Object.entries(this.metrics.calls)) {
const totalTime = this.metrics.totalTime[name] || 0;
const avgTime = calls > 0 ? (totalTime / calls).toFixed(2) : 0;
const errors = this.metrics.errors[name] || 0;
report.push({
runnable: name,
calls,
avgTime: `${avgTime}ms`,
totalTime: `${totalTime}ms`,
errors
});
}
return report;
}
reset() {
this.metrics = {calls: {}, totalTime: {}, errors: {}};
this.startTimes.clear();
}
}
/**
* FileCallback - Logs to file
*/
export class FileCallback extends BaseCallback {
constructor(filename) {
super();
this.filename = filename;
this.logs = [];
}
async onStart(runnable, input, config) {
this.logs.push({
timestamp: new Date().toISOString(),
event: 'start',
runnable: runnable.name,
input: this._serialize(input)
});
}
async onEnd(runnable, output, config) {
this.logs.push({
timestamp: new Date().toISOString(),
event: 'end',
runnable: runnable.name,
output: this._serialize(output)
});
}
async onError(runnable, error, config) {
this.logs.push({
timestamp: new Date().toISOString(),
event: 'error',
runnable: runnable.name,
error: error.message
});
}
async flush() {
const fs = await import('fs/promises');
await fs.writeFile(
this.filename,
JSON.stringify(this.logs, null, 2),
'utf-8'
);
this.logs = [];
}
_serialize(value) {
if (typeof value === 'string') return value;
if (value?.content) return value.content; // Message
return JSON.stringify(value);
}
} |