16292877152

Committed 15 Jul 2025 12:10PM UTC coverage: 77.385% (+2.1%) from 75.27%

Build # 16292877152

Build Type

push

github

Committed by

web-flow

Commit Message

chore(tests): switch to vitest (#363)

Run Details

498 of 687 branches covered (72.49%)

Branch coverage included in aggregate %.

0 of 27 new or added lines in 2 files covered. (0.0%)

293 existing lines in 26 files now uncovered.

2828 of 3611 relevant lines covered (78.32%)

28.46 hits per line

Source File
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86.11

/src/helpers/EJsonTransport.ts

import { JSONRPCMessage, JSONRPCMessageSchema } from "@modelcontextprotocol/sdk/types.js";
import { EJSON } from "bson";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";

// This is almost a copy of ReadBuffer from @modelcontextprotocol/sdk
// but it uses EJSON.parse instead of JSON.parse to handle BSON types
export class EJsonReadBuffer {
    private _buffer?: Buffer;

    append(chunk: Buffer): void {
        this._buffer = this._buffer ? Buffer.concat([this._buffer, chunk]) : chunk;
    }

    readMessage(): JSONRPCMessage | null {
        if (!this._buffer) {
            return null;
        }

        const index = this._buffer.indexOf("\n");
        if (index === -1) {
            return null;
        }

        const line = this._buffer.toString("utf8", 0, index).replace(/\r$/, "");
        this._buffer = this._buffer.subarray(index + 1);

        // This is using EJSON.parse instead of JSON.parse to handle BSON types
        return JSONRPCMessageSchema.parse(EJSON.parse(line));
    }

    clear(): void {
        this._buffer = undefined;
    }
}

// This is a hacky workaround for https://github.com/mongodb-js/mongodb-mcp-server/issues/211
// The underlying issue is that StdioServerTransport uses JSON.parse to deserialize
// messages, but that doesn't handle bson types, such as ObjectId when serialized as EJSON.
//
// This function creates a StdioServerTransport and replaces the internal readBuffer with EJsonReadBuffer
// that uses EJson.parse instead.
export function createEJsonTransport(): StdioServerTransport {
    const server = new StdioServerTransport();
    server["_readBuffer"] = new EJsonReadBuffer();

    return server;
}

1	import { JSONRPCMessage, JSONRPCMessageSchema } from "@modelcontextprotocol/sdk/types.js";	1!
2	import { EJSON } from "bson";	1✔
3	import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";	1✔
4
5	// This is almost a copy of ReadBuffer from @modelcontextprotocol/sdk
6	// but it uses EJSON.parse instead of JSON.parse to handle BSON types
7	export class EJsonReadBuffer {	1✔
8	private _buffer?: Buffer;
9
10	append(chunk: Buffer): void {	1✔
11	this._buffer = this._buffer ? Buffer.concat([this._buffer, chunk]) : chunk;	1!
12	}	1✔
13
14	readMessage(): JSONRPCMessage \| null {	1✔
15	if (!this._buffer) {	2!
16	return null;	×
UNCOV 17	}	×
18
19	const index = this._buffer.indexOf("\n");	2✔
20	if (index === -1) {	2✔
21	return null;	1✔
22	}	1✔
23
24	const line = this._buffer.toString("utf8", 0, index).replace(/\r$/, "");	1✔
25	this._buffer = this._buffer.subarray(index + 1);	1✔
26
27	// This is using EJSON.parse instead of JSON.parse to handle BSON types
28	return JSONRPCMessageSchema.parse(EJSON.parse(line));	1✔
29	}	2✔
30
31	clear(): void {	1✔
32	this._buffer = undefined;	3✔
33	}	3✔
34	}	1✔
35
36	// This is a hacky workaround for https://github.com/mongodb-js/mongodb-mcp-server/issues/211
37	// The underlying issue is that StdioServerTransport uses JSON.parse to deserialize
38	// messages, but that doesn't handle bson types, such as ObjectId when serialized as EJSON.
39	//
40	// This function creates a StdioServerTransport and replaces the internal readBuffer with EJsonReadBuffer
41	// that uses EJson.parse instead.
42	export function createEJsonTransport(): StdioServerTransport {	1✔
43	const server = new StdioServerTransport();	3✔
44	server["_readBuffer"] = new EJsonReadBuffer();	3✔
45
46	return server;	3✔
47	}	3✔

mongodb-js / mongodb-mcp-server / 16292877152

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