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* Pure bipartite graph model for the Coordination view: turns IPC streams and
* sessions into React Flow nodes and edges (chatroom/channel hubs, collapsed
* two-party pipes, edge direction from permission, external-session synthesis).
*
* No dagre and no React here — positions are placeholders, assigned later by
* {@link useCoordinationLayout}. Keeping this layer dagre-free makes the graph
* logic unit-testable (dagre's ESM build does not resolve under vitest).
*
* @module
*/
import { MarkerType, type Edge, type Node } from "@xyflow/react";
import type { Session, StreamData, StreamSubscriberData } from "../../hooks/types.js";
import {
attributeStreamWithMap,
streamKind,
type StreamKind,
type StreamOwnership,
} from "../../utils/streamCoordination.js";
/** React Flow node type id for session nodes. */
export const SESSION_NODE_TYPE: string = "session";
/** React Flow node type id for stream hub nodes. */
export const STREAM_NODE_TYPE: string = "stream";
/**
* React Flow edge type id used for all coordination edges. The custom
* `messageDot` edge (see `MessageDotEdge.tsx`) draws the smoothstep path and
* animates a dot along it when the edge's stream receives a new message.
*/
export const COORD_EDGE_TYPE: string = "messageDot";
/** Data attached to a session node. */
export interface SessionNodeData extends Record<string, unknown> {
kind: "session";
/** The session, or a synthetic placeholder when the subscriber's session is unknown. */
session: Session;
/** Number of visible streams this session participates in. */
streamCount: number;
/** True when synthesized from a subscriber id not present in the sessions list (CLI/MCP). */
external: boolean;
}
/** Data attached to a stream hub node. */
export interface StreamNodeData extends Record<string, unknown> {
kind: "stream";
stream: StreamData;
/**
* Display kind. Two-party pipes are collapsed into a direct edge and never
* become hubs; a `pipe` stream that cannot collapse (e.g. not exactly two
* distinct sessions) still renders as a hub with kind `pipe`.
*/
streamKind: StreamKind;
/** Ownership classification, used to decide whether the hub renders a task halo. */
ownership: StreamOwnership;
}
/** Union of node data shapes carried on the coordination graph. */
export type CoordNodeData = SessionNodeData | StreamNodeData;
/** Data attached to a coordination edge. */
export interface CoordEdgeData extends Record<string, unknown> {
/** `participation` = session<->hub subscription; `pipe` = collapsed 2-party pipe. */
edgeKind: "participation" | "pipe";
/** The stream this edge represents (the hub stream, or the collapsed pipe). */
streamId: string;
/** Subscriber permission ("r" | "w" | "rw") for participation edges. */
permission: string;
/** Delivery mode ("sync" | "async" | "detach"). */
deliveryMode: string;
/**
* Transient pulse key, stamped by the graph when a new message arrives so the
* animated edge fires a one-shot dot (Phase B). Undefined otherwise.
*/
pulseSeq?: string;
}
/** Nodes and edges for the coordination graph (positions assigned by the layout step). */
export interface CoordinationLayoutResult {
nodes: Node<CoordNodeData>[];
edges: Edge<CoordEdgeData>[];
}
/** Prefix a session id to form its unique React Flow / dagre node id. */
export function sessionNodeId(sessionId: string): string {
return `session:${sessionId}`;
}
/** Prefix a stream id to form its unique React Flow / dagre node id. */
export function streamNodeId(streamId: string): string {
return `stream:${streamId}`;
}
/** Minimal placeholder session for a subscriber whose session is not in the list. */
function syntheticSession(sessionId: string): Session {
return {
id: sessionId,
environmentId: "",
runtime: "external",
status: "external",
prompt: "",
startedAt: "",
};
}
/** Edge stroke style derived from delivery mode (detach reads as dashed + dimmed). */
function deliveryStyle(deliveryMode: string, stroke: string): Record<string, string | number> {
if (deliveryMode === "detach") {
return { stroke, strokeWidth: 1.5, strokeDasharray: "4 4", opacity: 0.6 };
}
return { stroke, strokeWidth: 1.5 };
}
/** Resolve a collapsed pipe's direction (writer -> reader subscriber), or mark it bidirectional. */
function resolvePipeDirection(
a: StreamSubscriberData,
b: StreamSubscriberData,
): { source: StreamSubscriberData; target: StreamSubscriberData; bidirectional: boolean } {
const aWrites = a.permission.includes("w");
const bWrites = b.permission.includes("w");
const aReads = a.permission.includes("r");
const bReads = b.permission.includes("r");
if (aWrites && !bWrites && bReads) {
return { source: a, target: b, bidirectional: false };
}
if (bWrites && !aWrites && aReads) {
return { source: b, target: a, bidirectional: false };
}
// Ambiguous (both rw, both w, etc.) — pick a deterministic order, no direction.
const ordered = [a, b].sort((x, y) => x.sessionId.localeCompare(y.sessionId));
return { source: ordered[0], target: ordered[1], bidirectional: true };
}
/**
* Build the bipartite coordination graph (nodes + edges) from streams and
* sessions. Node positions are placeholders ({@link useCoordinationLayout} runs
* dagre to assign real positions). Sessions with no visible streams are omitted.
*
* `showInternals` filtering is the caller's responsibility — the streams passed
* in are assumed already filtered (the page calls `loadStreams(includeInternal)`).
*/
export function buildCoordinationGraph(
streams: StreamData[],
sessions: Session[],
): CoordinationLayoutResult {
if (streams.length === 0) {
return { nodes: [], edges: [] };
}
const sessionsById = new Map(sessions.map((s) => [s.id, s]));
const sessionNodeData = new Map<string, SessionNodeData>();
const streamNodeData = new Map<string, StreamNodeData>();
const edges: Edge<CoordEdgeData>[] = [];
/** Register a session node once, returning its (mutable) data. */
const ensureSessionNode = (sessionId: string): SessionNodeData => {
let data = sessionNodeData.get(sessionId);
if (!data) {
const session = sessionsById.get(sessionId);
data = {
kind: "session",
session: session ?? syntheticSession(sessionId),
streamCount: 0,
external: session === undefined,
};
sessionNodeData.set(sessionId, data);
}
return data;
};
for (const stream of streams) {
const kind = streamKind(stream);
// Collapse a 2-party pipe into a single direct session->session edge.
if (
kind === "pipe" &&
stream.subscribers.length === 2 &&
stream.subscribers[0].sessionId !== stream.subscribers[1].sessionId
) {
const [a, b] = stream.subscribers;
ensureSessionNode(a.sessionId).streamCount += 1;
ensureSessionNode(b.sessionId).streamCount += 1;
const { source: srcSub, target: tgtSub, bidirectional } = resolvePipeDirection(a, b);
edges.push({
id: `edge-pipe-${stream.id}`,
source: sessionNodeId(srcSub.sessionId),
target: sessionNodeId(tgtSub.sessionId),
type: COORD_EDGE_TYPE,
// Derive metadata from the deterministically-resolved writer so the
// collapsed edge does not depend on arbitrary subscriber order.
data: {
edgeKind: "pipe",
streamId: stream.id,
permission: bidirectional ? "rw" : srcSub.permission,
deliveryMode: srcSub.deliveryMode,
},
style: { stroke: "var(--accent-yellow)", strokeWidth: 1.5, strokeDasharray: "6 3" },
// Bidirectional pipes get arrowheads on both ends; directed pipes only at the reader.
markerEnd: { type: MarkerType.ArrowClosed },
markerStart: bidirectional ? { type: MarkerType.ArrowClosed } : undefined,
animated: false,
});
continue;
}
// Otherwise render a hub node with one participation edge per subscriber.
streamNodeData.set(stream.id, {
kind: "stream",
stream,
streamKind: kind,
ownership: attributeStreamWithMap(stream, sessionsById),
});
for (const sub of stream.subscribers) {
ensureSessionNode(sub.sessionId).streamCount += 1;
const hub = streamNodeId(stream.id);
const sess = sessionNodeId(sub.sessionId);
const writes = sub.permission.includes("w");
const reads = sub.permission.includes("r");
let source: string;
let target: string;
let bidirectional = false;
if (writes && reads) {
source = sess;
target = hub;
bidirectional = true;
} else if (reads) {
source = hub;
target = sess;
} else {
// writer (or unknown) — session feeds the hub
source = sess;
target = hub;
}
edges.push({
id: `edge-part-${stream.id}-${sub.subscriptionId}`,
source,
target,
type: COORD_EDGE_TYPE,
data: {
edgeKind: "participation",
streamId: stream.id,
permission: sub.permission,
deliveryMode: sub.deliveryMode,
},
style: deliveryStyle(sub.deliveryMode, "var(--text-tertiary)"),
markerEnd: { type: MarkerType.ArrowClosed },
markerStart: bidirectional ? { type: MarkerType.ArrowClosed } : undefined,
animated: false,
});
}
}
const nodes: Node<CoordNodeData>[] = [];
for (const [sessionId, data] of sessionNodeData) {
nodes.push({
id: sessionNodeId(sessionId),
type: SESSION_NODE_TYPE,
position: { x: 0, y: 0 },
data,
});
}
for (const [streamId, data] of streamNodeData) {
nodes.push({
id: streamNodeId(streamId),
type: STREAM_NODE_TYPE,
position: { x: 0, y: 0 },
data,
});
}
return { nodes, edges };
}
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