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import type { CompilationResult, CompileRequestOptions } from "../services/arduino-compiler";
import type { Logger } from "@shared/logger";
import { compileRequestSchema } from "@shared/schema";
import { TEST_RUN_ID_PATTERN } from "@shared/input-limits";
import { resolvePathWithinRoot } from "../security/safe-paths";
import { compileMetricsTracker } from "../services/server-metrics";
import path from "node:path";
import type { RequestIdentity } from "../security/access-control";
import type { RateLimitResult } from "../services/rate-limiter";
import { operationError, SYSTEM_BUSY_MESSAGE } from "@shared/operation-errors";
import { CompileCapacityError } from "../services/compilation-worker-pool";
import { safeErrorLogMetadata } from "../services/safe-error-log-metadata";
type CompilerHeader = { name: string; content: string };
type CompilerDeps = {
compiler: {
compile: (code: string, headers?: CompilerHeader[], tempRoot?: string, options?: CompileRequestOptions) => Promise<CompilationResult>;
tracksCompileMetrics?: boolean;
};
compilationCache: Map<string, { result: CompilationResult; timestamp: number }>;
hashCode: (code: string, headers?: CompilerHeader[], options?: CompileRequestOptions) => string;
CACHE_TTL: number;
setLastCompiledCode: (subject: string, code: string) => void;
logger: Logger;
compileRateLimiter?: { checkLimit: (identity: string) => RateLimitResult };
disableRateLimit?: boolean;
};
type CompileRequestData = {
code: string;
headers?: CompilerHeader[];
entryFile?: string;
fqbn?: string;
libraries?: string[];
};
type ParsedCompileRequest =
| { success: true; data: CompileRequestData }
| { success: false; error: string };
function parseCompileRequest(body: unknown): ParsedCompileRequest {
const parsedRequest = compileRequestSchema.safeParse(body);
if (!parsedRequest.success) {
const codeMissing = parsedRequest.error.issues.some(
(issue) => issue.path[0] === "code" && issue.code === "invalid_type",
);
return { success: false, error: codeMissing ? "Code is required" : "Invalid compile request" };
}
Iif (!parsedRequest.data.code) {
return { success: false, error: "Code is required" };
}
return { success: true, data: parsedRequest.data };
}
/** The HEX stays on the server: the client never uses it and it inflates every response. */
function withoutBinary(result: CompilationResult): CompilationResult {
const { binary: _binary, ...clientResult } = result;
return clientResult;
}
function isTimedOutCompileResult(result: CompilationResult): boolean {
return !result.success && `${result.stderr ?? ""} ${result.errors.map((err) => err.message).join(" ")}`.toLowerCase().includes("timeout");
}
function recordCompileMetricIfNeeded(
compiler: CompilerDeps["compiler"],
compileStartTime: number,
result: CompilationResult,
): void {
Iif (compiler.tracksCompileMetrics === true) return;
compileMetricsTracker.recordCompileComplete(
compileStartTime,
0,
result.success,
isTimedOutCompileResult(result),
);
}
function recordCompileErrorIfNeeded(
compiler: CompilerDeps["compiler"],
compileStartTime: number | null,
error: unknown,
): void {
Iif (compileStartTime === null || compiler.tracksCompileMetrics === true) return;
const message = error instanceof Error ? error.message : String(error);
compileMetricsTracker.recordCompileComplete(compileStartTime, 0, false, message.toLowerCase().includes("timeout"));
}
function enforceCompileRateLimit(
res: Response,
deps: CompilerDeps,
): boolean {
if (!deps.compileRateLimiter || deps.disableRateLimit) return true;
const identity = res.locals.unosimIdentity as RequestIdentity | undefined;
Iif (!identity) {
deps.logger.error("[Compiler Route] Missing trusted request identity");
res.status(500).json({ error: "Compilation failed" });
return false;
}
const limit = deps.compileRateLimiter.checkLimit(identity.subject);
if (!limit.allowed) {
res.setHeader("Retry-After", String(limit.retryAfter));
res.status(429).json({
error: operationError(
"RATE_LIMITED",
"Compile rate limit exceeded. Please try again later.",
limit.retryAfter,
),
});
return false;
}
return true;
}
function getCachedCompilation(
compilationCache: CompilerDeps["compilationCache"],
codeHash: string,
cacheTtl: number,
cacheDisabled: boolean,
): { result: CompilationResult; ageMs: number } | null {
Iif (cacheDisabled) return null;
const cachedEntry = compilationCache.get(codeHash);
if (!cachedEntry) return null;
const ageMs = Date.now() - cachedEntry.timestamp;
if (ageMs < cacheTtl) return { result: cachedEntry.result, ageMs };
compilationCache.delete(codeHash);
return null;
}
export function registerCompilerRoutes(app: Express, deps: CompilerDeps) {
const { compiler, compilationCache, hashCode, CACHE_TTL, setLastCompiledCode, logger } = deps;
const rememberCompiledCode = (res: Response, code: string) => {
const identity = res.locals.unosimIdentity as RequestIdentity | undefined;
Eif (identity) setLastCompiledCode(identity.subject, code);
};
app.post("/api/compile", async (req, res) => {
let compileStartTime: number | null = null;
try {
if (!enforceCompileRateLimit(res, deps)) return;
const parsedRequest = parseCompileRequest(req.body);
if (!parsedRequest.success) {
return res.status(400).json({ error: parsedRequest.error });
}
const { code, headers, entryFile, fqbn, libraries } = parsedRequest.data;
const compileOptions = {
fqbn,
libraries,
...(entryFile ? { entryFile } : {}),
};
const codeHash = hashCode(code, headers, compileOptions);
const cacheDisabled = process.env.DISABLE_COMPILE_CACHE === "true";
const cachedResult = getCachedCompilation(
compilationCache,
codeHash,
CACHE_TTL,
cacheDisabled,
);
if (cachedResult) {
logger.info(`✅ Cache hit for code (age: ${cachedResult.ageMs}ms)`);
rememberCompiledCode(res, code);
return res.json({ ...cachedResult.result, cached: true });
}
const testRunIdHeader = req.header("x-test-run-id");
if (testRunIdHeader !== undefined && !TEST_RUN_ID_PATTERN.test(testRunIdHeader)) {
return res.status(400).json({ error: "Invalid test run ID" });
}
const compileTempRoot = testRunIdHeader
? resolvePathWithinRoot(path.join(process.cwd(), "temp"), testRunIdHeader)
: undefined;
compileStartTime = Date.now();
const result: CompilationResult = await compiler.compile(
code,
headers,
compileTempRoot,
compileOptions,
);
recordCompileMetricIfNeeded(compiler, compileStartTime, result);
const clientResult = withoutBinary(result);
if (result.success) {
Eif (!cacheDisabled) {
compilationCache.set(codeHash, { result: clientResult, timestamp: Date.now() });
logger.info(`✅ Cached compilation result for code`);
}
rememberCompiledCode(res, code);
}
res.json(clientResult);
} catch (error) {
if (error instanceof CompileCapacityError) {
const retryAfter = 5;
logger.warn(`[Compiler Route] Compile capacity exhausted: ${error.message}`);
res.setHeader("Retry-After", String(retryAfter));
return res.status(503).json({ error: operationError("SYSTEM_BUSY", SYSTEM_BUSY_MESSAGE, retryAfter) });
}
recordCompileErrorIfNeeded(compiler, compileStartTime, error);
logger.error(`[Compiler Route] Error during /api/compile (${safeErrorLogMetadata(error)})`);
res.status(500).json({ error: "Compilation failed" });
}
});
}
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