Exposing Streams

Reference for exposing xs stores for remote access and connecting to remote stores.

Server: Exposing a Store

When running xs serve, you can expose your store for remote access using the --expose option with different networking protocols:

TCP (Traditional Networking)

Expose on a specific host and port:

xs serve ./store --expose :3021  # localhost on port 3021
xs serve ./store --expose 192.168.1.100:8080  # specific host

Iroh (Peer-to-Peer)

Expose via iroh for peer-to-peer QUIC connections:

xs serve ./store --expose iroh://

When using iroh, the server will generate a connection ticket that clients can use to connect directly via QUIC, even across NATs and firewalls.

Getting the Connection Details

For TCP

The address you specify is the connection address:

TCP: :3021 or 192.168.1.100:8080

For Iroh

To get the iroh connection ticket, use the .last command:

.last xs.start

The ticket will be in the expose field of the metadata:

────────────┬─────────────────────────────────────────────────
 topic      │ xs.start
 id         │ 03ek4n3sq2i9fio5tc9wn9mov
 hash       │
 meta       │ ─────────┬─────────────────────────────────────
            │  expose  │ iroh://nodeaagxeomb7ezyg4prcpn...
            │ ─────────┴─────────────────────────────────────
 ttl        │
────────────┴─────────────────────────────────────────────────

Client: Connecting to Remote Stores

All xs commands that accept an <addr> parameter can connect to remote stores:

TCP Connections

xs cat :3021
"hello world" | xs append 192.168.1.100:8080 chat
xs eval :3021 -c '.cat --topic notes'

Iroh Connections

Use the full iroh ticket from the server:

xs cat iroh://nodeac4lrf7r5hyqeuj...crjpx6ajinb2hi4d
"hello p2p QUIC" | xs append iroh://nodeac4lrf7r5hyqeuj...crjpx6ajinb2hi4d chat
xs eval iroh://nodeac4lrf7r5hyqeuj...crjpx6ajinb2hi4d -c '.last status'

Environment Configuration

XS_ADDR Environment Variable

Set $env.XS_ADDR to avoid repeating the connection address in xs.nu commands:

# TCP connection
$env.XS_ADDR = ":3021"

# Iroh connection
$env.XS_ADDR = "iroh://nodeac4lrf7r5hyqeuj...crjpx6ajinb2hi4d"

With XS_ADDR set, xs.nu convenience functions will automatically use the remote store:

.cat                    # connects to $env.XS_ADDR
"message" | .append logs  # appends to remote store
.last status            # gets last from remote store

See the xs.nu reference for all available convenience functions.

Connection Examples

Local Development

# Terminal 1: Start server
xs serve ./store --expose :3021

# Terminal 2: Connect and use
$env.XS_ADDR = ":3021"
"development note" | .append notes
.cat --follow

# Server: Start with iroh
xs serve ./store --expose iroh://

# Server: Get ticket
.last xs.start

# Client: Connect with ticket
xs cat iroh://nodeac4lrf7r5hyqeuj...crjpx6ajinb2hi4d --follow

Remote Evaluation

# Evaluate Nushell scripts on remote store
xs eval :3021 -c '{topic: "heartbeat", timestamp: (date now)}'
xs eval iroh://nodeac4lrf7r5hyqeuj...crjpx6ajinb2hi4d -c 'ls | each { $in } | .append files'