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/**
* In-memory aggregator for CDP Network.* events.
*
* The CDP event stream is consumed by a single internal loop in session.ts.
* That loop hands Network.* event params to this module, which joins them into
* one record per requestId (request → response → finished/failed). Tools then
* read records via drain(), filtered to what the caller asked for.
*
* Bounded by a fixed capacity (default 500): on overflow the oldest record is
* evicted FIFO. The overflow flag is reported once per drain so tools can warn
* the LLM that data may be missing.
*
* This module has no transport dependency, so the joining/filtering logic stays
* trivially testable in isolation.
*/
import { decodeEvent } from "./events";
export type NetworkRecord = {
requestId: string;
method: string;
url: string;
status?: number;
statusText?: string;
type: string;
mimeType?: string;
/** Wall-clock ms when requestWillBeSent fired, in Date.now() units. */
requestStartedMs: number;
durationMs?: number;
requestBodySize: number;
responseBodySize?: number;
failed?: boolean;
errorText?: string;
/** Populated by the tool layer via Network.getResponseBody, never by the aggregator. */
body?: string | null;
};
export type NetworkFilter = {
/** Substring match by default. Wrap in slashes (`/foo/`) for regex. */
urlPattern?: string;
methodFilter?: string[];
statusFilter?: { min?: number; max?: number };
resourceTypes?: string[];
/** Only requests whose start is at most N ms ago. */
sinceMs?: number;
/** Cap on the returned records. */
limit?: number;
};
export type DrainResult = {
readonly records: NetworkRecord[];
/** Total matches before `limit` was applied. */
readonly total: number;
/** True if the ring buffer evicted at least one record since the last drain. */
readonly bufferOverflowed: boolean;
};
export type NetworkBuffer = {
ingestRequestWillBeSent(p: unknown): void;
ingestResponseReceived(p: unknown): void;
ingestLoadingFinished(p: unknown): void;
ingestLoadingFailed(p: unknown): void;
drain(filter: NetworkFilter): DrainResult;
clear(): void;
};
const compileUrlMatcher = (pattern: string): ((url: string) => boolean) => {
if (pattern.length >= 2 && pattern.startsWith("/") && pattern.endsWith("/")) {
try {
const re = new RegExp(pattern.slice(1, -1));
return (url) => re.test(url);
} catch {
// Fall through to substring match if the pattern is not a valid regex.
}
}
return (url) => url.includes(pattern);
};
export const createNetworkBuffer = (capacity = 500): NetworkBuffer => {
// Insertion-ordered map keyed by requestId. Map preserves insertion order in JS,
// so iteration gives us oldest-first eviction without a separate index.
const records = new Map<string, NetworkRecord>();
let overflowed = false;
const evictOldestIfFull = (): void => {
while (records.size >= capacity) {
const oldest = records.keys().next();
if (oldest.done) return;
records.delete(oldest.value);
overflowed = true;
}
};
return {
ingestRequestWillBeSent(p) {
const decoded = decodeEvent("Network.requestWillBeSent", p);
const params = decoded.success ? decoded.data : undefined;
const id = params?.requestId;
const url = params?.request.url;
const method = params?.request.method;
if (!id || !url || !method) return;
// Re-fired requestWillBeSent for the same id (e.g. redirect) — refresh in place.
records.delete(id);
evictOldestIfFull();
const postData = params.request.postData;
records.set(id, {
requestId: id,
method,
url,
type: params.type ?? "Other",
requestStartedMs: Date.now(),
requestBodySize: postData ? Buffer.byteLength(postData, "utf8") : 0,
});
},
ingestResponseReceived(p) {
const decoded = decodeEvent("Network.responseReceived", p);
const params = decoded.success ? decoded.data : undefined;
const id = params?.requestId;
if (!id) return;
const r = records.get(id);
if (!r) return;
if (params?.response?.status !== undefined) r.status = params.response.status;
if (params?.response?.statusText !== undefined && params.response.statusText !== "") r.statusText = params.response.statusText;
if (params?.response?.mimeType !== undefined) r.mimeType = params.response.mimeType;
// type is more accurate on responseReceived (CDP sometimes refines it)
if (params?.type !== undefined) r.type = params.type;
},
ingestLoadingFinished(p) {
const decoded = decodeEvent("Network.loadingFinished", p);
const params = decoded.success ? decoded.data : undefined;
const id = params?.requestId;
if (!id) return;
const r = records.get(id);
if (!r) return;
if (params?.encodedDataLength !== undefined) r.responseBodySize = params.encodedDataLength;
r.durationMs = Date.now() - r.requestStartedMs;
},
ingestLoadingFailed(p) {
const decoded = decodeEvent("Network.loadingFailed", p);
const params = decoded.success ? decoded.data : undefined;
const id = params?.requestId;
if (!id) return;
const r = records.get(id);
if (!r) return;
r.failed = true;
if (params?.errorText !== undefined) r.errorText = params.errorText;
r.durationMs = Date.now() - r.requestStartedMs;
},
drain(filter) {
const matchUrl = filter.urlPattern !== undefined ? compileUrlMatcher(filter.urlPattern) : undefined;
const methods = filter.methodFilter ? new Set(filter.methodFilter.map((m) => m.toUpperCase())) : undefined;
const types = filter.resourceTypes ? new Set(filter.resourceTypes.map((t) => t.toLowerCase())) : undefined;
const minStatus = filter.statusFilter?.min;
const maxStatus = filter.statusFilter?.max;
const cutoff = filter.sinceMs !== undefined ? Date.now() - filter.sinceMs : undefined;
const matched: NetworkRecord[] = [];
for (const r of records.values()) {
if (matchUrl && !matchUrl(r.url)) continue;
if (methods && !methods.has(r.method.toUpperCase())) continue;
if (types && !types.has(r.type.toLowerCase())) continue;
if (cutoff !== undefined && r.requestStartedMs < cutoff) continue;
if (minStatus !== undefined && (r.status === undefined || r.status < minStatus)) continue;
if (maxStatus !== undefined && (r.status === undefined || r.status > maxStatus)) continue;
// Clone so callers can mutate (e.g. attach body) without polluting the buffer.
matched.push({ ...r });
}
const total = matched.length;
const limit = Math.min(filter.limit ?? 50, 500);
const limited = matched.slice(-limit); // most recent N
const bufferOverflowed = overflowed;
overflowed = false;
return { records: limited, total, bufferOverflowed };
},
clear() {
records.clear();
overflowed = false;
},
};
};
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