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import type { Attributes, LogRecord } from "@dispatch/kernel";
interface SpanInfo {
name: string;
openTimestamp: number;
closeTimestamp?: number;
durationMs?: number;
status?: string;
body?: string;
attributes?: Attributes;
children: TimelineEntry[];
}
interface LogEntry {
record: LogRecord;
}
type TimelineEntry = { type: "span"; span: SpanInfo } | { type: "log"; entry: LogEntry };
export function renderEasyView(records: readonly LogRecord[]): string {
if (records.length === 0) {
return "";
}
const sorted = [...records].sort((a, b) => a.timestamp - b.timestamp);
const spansById = new Map<string, SpanInfo>();
const roots: TimelineEntry[] = [];
const childrenByParent = new Map<string | undefined, TimelineEntry[]>();
for (const r of sorted) {
if (r.kind === "span-open") {
const span: SpanInfo = {
name: r.name,
openTimestamp: r.timestamp,
...(r.body !== undefined && { body: r.body }),
...(r.attributes !== undefined && { attributes: r.attributes }),
children: [],
};
spansById.set(r.spanId, span);
} else if (r.kind === "span-close") {
const span = spansById.get(r.spanId);
if (span !== undefined) {
span.closeTimestamp = r.timestamp;
span.durationMs = r.durationMs;
span.status = r.status;
if (r.body !== undefined) {
span.body = r.body;
}
if (r.attributes !== undefined) {
span.attributes = { ...span.attributes, ...r.attributes };
}
}
} else {
const entry: TimelineEntry = { type: "log", entry: { record: r } };
const parentId = r.parentSpanId;
let siblings = childrenByParent.get(parentId);
if (siblings === undefined) {
siblings = [];
childrenByParent.set(parentId, siblings);
}
siblings.push(entry);
}
}
for (const [spanId, span] of spansById) {
const entry: TimelineEntry = { type: "span", span };
const parentId = getSpanParentId(sorted, spanId);
let siblings = childrenByParent.get(parentId);
if (siblings === undefined) {
siblings = [];
childrenByParent.set(parentId, siblings);
}
siblings.push(entry);
}
for (const [parentId, children] of childrenByParent) {
if (parentId === undefined) {
roots.push(...children);
} else {
const parent = spansById.get(parentId);
if (parent !== undefined) {
parent.children.push(...children);
} else {
roots.push(...children);
}
}
}
sortByTimestamp(roots);
for (const entry of roots) {
if (entry.type === "span") {
sortByTimestamp(entry.span.children);
}
}
const lines: string[] = [];
for (const entry of roots) {
renderEntry(entry, 0, lines);
}
return lines.join("\n");
}
function sortByTimestamp(entries: TimelineEntry[]): void {
entries.sort((a, b) => {
const tsA = a.type === "span" ? a.span.openTimestamp : a.entry.record.timestamp;
const tsB = b.type === "span" ? b.span.openTimestamp : b.entry.record.timestamp;
return tsA - tsB;
});
}
function getSpanParentId(records: readonly LogRecord[], spanId: string): string | undefined {
for (const r of records) {
if (r.kind === "span-open" && r.spanId === spanId) {
return r.parentSpanId;
}
}
return undefined;
}
function renderEntry(entry: TimelineEntry, depth: number, lines: string[]): void {
const indent = " ".repeat(depth);
if (entry.type === "span") {
const span = entry.span;
const dur = span.durationMs !== undefined ? formatDuration(span.durationMs) : undefined;
const statusStr = span.status === "error" ? " ERR" : "";
const suffix = dur !== undefined ? ` ${dur}${statusStr}` : " (open)";
let detail = "";
if (span.attributes !== undefined) {
const keys = Object.keys(span.attributes);
if (keys.length > 0) {
const parts: string[] = [];
for (const k of keys.slice(0, 3)) {
const v = span.attributes[k];
if (v !== undefined) {
parts.push(`${k}=${formatAttrValue(v)}`);
}
}
detail = ` {${parts.join(", ")}}`;
}
}
const bodyHint = span.body !== undefined ? ` [body ${formatSize(span.body.length)}]` : "";
lines.push(`${indent}- ${span.name}${suffix}${detail}${bodyHint}`);
for (const child of span.children) {
renderEntry(child, depth + 1, lines);
}
} else {
const r = entry.entry.record;
if (r.kind === "log") {
const lvl = levelTag(r.level);
const bodyHint = r.body !== undefined ? ` [body ${formatSize(r.body.length)}]` : "";
lines.push(`${indent}- ${lvl}${r.msg}${bodyHint}`);
}
}
}
function levelTag(level: string): string {
if (level === "info") {
return "";
}
return `[${level}] `;
}
export function formatDuration(ms: number): string {
if (ms < 1000) {
return `${ms}ms`;
}
const s = ms / 1000;
if (s < 60) {
return `${s.toFixed(1)}s`;
}
const m = Math.floor(s / 60);
const rem = (s % 60).toFixed(0);
return `${m}m${rem}s`;
}
function formatSize(n: number): string {
if (n < 1024) {
return `${n}b`;
}
const kb = n / 1024;
if (kb < 1024) {
return `${kb.toFixed(1)}k`;
}
const mb = kb / 1024;
return `${mb.toFixed(1)}M`;
}
function formatAttrValue(value: string | number | boolean | null): string {
if (value === null) {
return "null";
}
if (typeof value === "string") {
if (value.length > 20) {
return `"${value.slice(0, 17)}..."`;
}
return `"${value}"`;
}
return String(value);
}
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