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Merge pull request #42 from Curabis/fix/bc-mcp-bridge-timeout-retry

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bc-mcp-bridge: timeout + one-retry-with-fresh-session self-heal
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Michael Dieringer 2026-08-05 14:06:18 +02:00 • committed by GitHub
commit b79b90c4ec
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1 changed files with 34 additions and 2 deletions
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36
custom/setup/bc-mcp-bridge.js
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@ -15,6 +15,14 @@ const fs = require("fs");
const path = require("path");
const ENDPOINT = "https://mcp.businesscentral.dynamics.com";
// 2026-08-04: neither fetch() call below had a timeout, and the BC session
// (sessionId) + underlying HTTP connection were reused for the bridge
// process's entire lifetime with no proactive refresh. A long-running Claude
// Code session with gaps between calls can leave either stale -- observed as
// a 30-minute hang on one call, and separately as an "Internal_CompanyNotFound"
// that wasn't actually a company problem. REQUEST_TIMEOUT_MS + the one-retry
// wrapper below fail fast and self-heal with a forced-fresh session instead.
const REQUEST_TIMEOUT_MS = 30000;
function die(m) { process.stderr.write(`[bc-mcp-bridge] ${m}\n`); process.exit(1); }
@ -56,6 +64,7 @@ async function getToken() {
method: "POST",
headers: { "Content-Type": "application/x-www-form-urlencoded" },
body,
signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
});
if (!r.ok) throw new Error(`token ${r.status}: ${await r.text()}`);
const j = await r.json();
@ -76,7 +85,7 @@ function parseSSE(text) {
return msgs;
}
async function forward(msg) {
async function forwardOnce(msg) {
const tok = await getToken();
const headers = {
"Authorization": `Bearer ${tok}`,
@ -88,7 +97,12 @@ async function forward(msg) {
"ConfigurationName": enc(cfg.config),
};
if (sessionId) headers["Mcp-Session-Id"] = sessionId;
const r = await fetch(ENDPOINT, { method: "POST", headers, body: JSON.stringify(msg) });
const r = await fetch(ENDPOINT, {
method: "POST",
headers,
body: JSON.stringify(msg),
signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
});
const sid = r.headers.get("mcp-session-id"); if (sid) sessionId = sid;
const ct = r.headers.get("content-type") || "";
const text = await r.text();
@ -103,6 +117,24 @@ async function forward(msg) {
return ct.includes("text/event-stream") ? parseSSE(text) : (text.trim() ? [text.trim()] : []);
}
async function forward(msg) {
try {
return await forwardOnce(msg);
} catch (e) {
// 2026-08-04: one retry with a forced-fresh BC session (sessionId cleared).
// A long-idle Claude Code session can leave the cached Mcp-Session-Id or
// the underlying HTTP connection stale -- observed as a request hanging
// until REQUEST_TIMEOUT_MS, or as an "Internal_CompanyNotFound" that was
// actually a dead session, not a real company problem. Quick, frequent
// calls never idle long enough to hit this; a long session with gaps
// between calls does. One retry self-heals without the developer noticing;
// if the retry also fails, this is a real error and should surface as one.
process.stderr.write(`[bc-mcp-bridge] retrying after: ${e.message || e}\n`);
sessionId = null;
return await forwardOnce(msg);
}
}
// Splits text into chunks of max maxLen chars, breaking at word boundaries.
function splitTextToChunks(text, maxLen = 250) {
const chunks = [];