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fix: guard server startup to avoid port conflicts

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Add health check before starting sandbox-agent to prevent 'address already
in use' errors on subsequent requests. The isServerRunning() function probes
the health endpoint to determine if setup should be skipped.

Co-authored-by: Shelley <shelley@exe.dev>
This commit is contained in:
Shelley 2026-02-03 00:29:44 +00:00
parent 33ace91cfd
commit f547cfe7f1
2 changed files with 73 additions and 39 deletions
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57
docs/deploy/cloudflare.mdx
View file

@ -25,7 +25,7 @@ cd my-sandbox
## TypeScript Example
```typescript
import { getSandbox, proxyToSandbox } from "@cloudflare/sandbox";
import { getSandbox, proxyToSandbox, type Sandbox } from "@cloudflare/sandbox";
export { Sandbox } from "@cloudflare/sandbox";
type Env = {
@ -34,6 +34,16 @@ type Env = {
OPENAI_API_KEY?: string;
};
/** Check if sandbox-agent is already running by probing its health endpoint */
async function isServerRunning(sandbox: Sandbox): Promise<boolean> {
try {
const result = await sandbox.exec("curl -sf http://localhost:8000/v1/health");
return result.success;
} catch {
return false;
}
}
export default {
async fetch(request: Request, env: Env): Promise<Response> {
// Proxy requests to exposed ports first
@ -43,35 +53,42 @@ export default {
const { hostname } = new URL(request.url);
const sandbox = getSandbox(env.Sandbox, "sandbox-agent");
// Install sandbox-agent
await sandbox.exec(
"curl -fsSL https://releases.rivet.dev/sandbox-agent/latest/install.sh | sh"
);
// Check if server is already running to avoid port conflicts
const alreadyRunning = await isServerRunning(sandbox);
// Install agents
await sandbox.exec("sandbox-agent install-agent claude");
await sandbox.exec("sandbox-agent install-agent codex");
if (!alreadyRunning) {
// Install sandbox-agent
await sandbox.exec(
"curl -fsSL https://releases.rivet.dev/sandbox-agent/latest/install.sh | sh"
);
// Set environment variables for agents
const envVars: Record<string, string> = {};
if (env.ANTHROPIC_API_KEY) envVars.ANTHROPIC_API_KEY = env.ANTHROPIC_API_KEY;
if (env.OPENAI_API_KEY) envVars.OPENAI_API_KEY = env.OPENAI_API_KEY;
await sandbox.setEnvVars(envVars);
// Install agents
await sandbox.exec("sandbox-agent install-agent claude");
await sandbox.exec("sandbox-agent install-agent codex");
// Start sandbox-agent server as background process
await sandbox.startProcess(
"sandbox-agent server --no-token --host 0.0.0.0 --port 8000"
);
// Set environment variables for agents
const envVars: Record<string, string> = {};
if (env.ANTHROPIC_API_KEY) envVars.ANTHROPIC_API_KEY = env.ANTHROPIC_API_KEY;
if (env.OPENAI_API_KEY) envVars.OPENAI_API_KEY = env.OPENAI_API_KEY;
await sandbox.setEnvVars(envVars);
// Wait for server to start
await new Promise((r) => setTimeout(r, 2000));
// Start sandbox-agent server as background process
await sandbox.startProcess(
"sandbox-agent server --no-token --host 0.0.0.0 --port 8000"
);
// Wait for server to start
await new Promise((r) => setTimeout(r, 2000));
}
// Expose the port with a preview URL
const exposed = await sandbox.exposePort(8000, { hostname });
return Response.json({
endpoint: exposed.url,
message: "sandbox-agent server is running",
message: alreadyRunning
? "sandbox-agent server was already running"
: "sandbox-agent server started",
});
},
};

55
examples/cloudflare/src/cloudflare.ts
View file

@ -7,6 +7,16 @@ type Env = {
OPENAI_API_KEY?: string;
};
/** Check if sandbox-agent is already running by probing its health endpoint */
async function isServerRunning(sandbox: Sandbox): Promise<boolean> {
try {
const result = await sandbox.exec("curl -sf http://localhost:8000/v1/health");
return result.success;
} catch {
return false;
}
}
export default {
async fetch(request: Request, env: Env): Promise<Response> {
// Proxy requests to exposed ports first
@ -16,28 +26,33 @@ export default {
const { hostname } = new URL(request.url);
const sandbox = getSandbox(env.Sandbox, "sandbox-agent");
console.log("Installing sandbox-agent...");
await sandbox.exec(
"curl -fsSL https://releases.rivet.dev/sandbox-agent/latest/install.sh | sh"
);
// Check if server is already running to avoid port conflicts
const alreadyRunning = await isServerRunning(sandbox);
console.log("Installing agents...");
await sandbox.exec("sandbox-agent install-agent claude");
await sandbox.exec("sandbox-agent install-agent codex");
if (!alreadyRunning) {
console.log("Installing sandbox-agent...");
await sandbox.exec(
"curl -fsSL https://releases.rivet.dev/sandbox-agent/latest/install.sh | sh"
);
// Set environment variables for agents
const envVars: Record<string, string> = {};
if (env.ANTHROPIC_API_KEY) envVars.ANTHROPIC_API_KEY = env.ANTHROPIC_API_KEY;
if (env.OPENAI_API_KEY) envVars.OPENAI_API_KEY = env.OPENAI_API_KEY;
await sandbox.setEnvVars(envVars);
console.log("Installing agents...");
await sandbox.exec("sandbox-agent install-agent claude");
await sandbox.exec("sandbox-agent install-agent codex");
console.log("Starting sandbox-agent server...");
await sandbox.startProcess(
"sandbox-agent server --no-token --host 0.0.0.0 --port 8000"
);
// Set environment variables for agents
const envVars: Record<string, string> = {};
if (env.ANTHROPIC_API_KEY) envVars.ANTHROPIC_API_KEY = env.ANTHROPIC_API_KEY;
if (env.OPENAI_API_KEY) envVars.OPENAI_API_KEY = env.OPENAI_API_KEY;
await sandbox.setEnvVars(envVars);
// Wait for server to start
await new Promise((r) => setTimeout(r, 2000));
console.log("Starting sandbox-agent server...");
await sandbox.startProcess(
"sandbox-agent server --no-token --host 0.0.0.0 --port 8000"
);
// Wait for server to start
await new Promise((r) => setTimeout(r, 2000));
}
// Expose the port with a preview URL
const exposed = await sandbox.exposePort(8000, { hostname });
@ -46,7 +61,9 @@ export default {
return Response.json({
endpoint: exposed.url,
message: "sandbox-agent server is running",
message: alreadyRunning
? "sandbox-agent server was already running"
: "sandbox-agent server started",
});
},
};