feat: add --no-blockchain mode for routing commits/identity updates to nodes

dev/docker/docker-compose.yml

@@ -3,20 +3,28 @@ x-postgres-image: &x-postgres-image postgres:16
 services:
   db:
     image: *x-postgres-image
-    profiles: ["single", "dual"]
+    profiles: ["single", "dual", "triple"]
     environment:
       POSTGRES_PASSWORD: xmtp
     ports:
       - 8765:5432
 
   db2:
     image: *x-postgres-image
-    profiles: ["dual"]
+    profiles: ["dual", "triple"]
     environment:
       POSTGRES_PASSWORD: xmtp
     ports:
       - 8766:5432
 
+  db3:
+    image: *x-postgres-image
+    profiles: ["triple"]
+    environment:
+      POSTGRES_PASSWORD: xmtp
+    ports:
+      - 8767:5432
+
   chain:
     platform: linux/amd64
     image: ghcr.io/xmtp/contracts:v2026.02.10-1

dev/docker/up

@@ -4,7 +4,7 @@ set -eo pipefail
 if [ -z "$1" ]; then
   profile="single"
   echo "No profile provided, defaulting to single"
-elif [ "$1" = "single" ] || [ "$1" = "dual" ]; then
+elif [ "$1" = "single" ] || [ "$1" = "dual" ] || [ "$1" = "triple" ]; then
   profile="$1"
 else
   echo "Invalid profile '$1', defaulting to single"
@@ -51,8 +51,8 @@ run_cli \
   --add \
   --node-id=100
 
-# Register and enable node 2 (dual only)
-if [ "${profile}" = "dual" ]; then
+# Register and enable node 2 (dual or triple)
+if [ "${profile}" = "dual" ] || [ "${profile}" = "triple" ]; then
   run_cli \
     nodes register \
     --owner-address="${ANVIL_ACC_2_ADDRESS}" \
@@ -65,4 +65,18 @@ if [ "${profile}" = "dual" ]; then
     --node-id=200
 fi
 
+# Register and enable node 3 (triple only)
+if [ "${profile}" = "triple" ]; then
+  run_cli \
+    nodes register \
+    --owner-address="${ANVIL_ACC_3_ADDRESS}" \
+    --signing-key-pub="${ANVIL_ACC_3_PUBLIC_KEY}" \
+    --http-address="${NODE_3_HTTP_ADDRESS}"
+
+  run_cli \
+    nodes canonical-network \
+    --add \
+    --node-id=300
+fi
+
 echo

dev/local.env

@@ -34,6 +34,12 @@ export ANVIL_ACC_2_PUBLIC_KEY="0x039d9031e97dd78ff8c15aa86939de9b1e791066a0224e3
 export ANVIL_ACC_2_ADDRESS="0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC"
 export NODE_2_HTTP_ADDRESS="http://localhost:5051"
 
+# Account 3. Used to register local node 3.
+export ANVIL_ACC_3_PRIVATE_KEY="0x7c852118294e51e653712a81e05800f419141751be58f605c371e15141b007a6"
+export ANVIL_ACC_3_PUBLIC_KEY="0x0220b871f3ced029e14472ec4ebc3c0448164942b123aa6af91a3386c1c403e0eb"
+export ANVIL_ACC_3_ADDRESS="0x90F79bf6EB2c4f870365E785982E1f101E93b906"
+export NODE_3_HTTP_ADDRESS="http://localhost:5052"
+
 # Top Level Options Default Node
 export XMTPD_SIGNER_PRIVATE_KEY=$ANVIL_ACC_1_PRIVATE_KEY
 export XMTPD_SIGNER_PUBLIC_KEY=$ANVIL_ACC_1_PUBLIC_KEY

dev/run-3

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -eu
+
+. dev/local.env
+
+export XMTPD_SIGNER_PRIVATE_KEY=$ANVIL_ACC_3_PRIVATE_KEY
+export XMTPD_PAYER_PRIVATE_KEY=$XMTPD_SIGNER_PRIVATE_KEY
+export XMTPD_DB_WRITER_CONNECTION_STRING="postgres://postgres:xmtp@localhost:8767/postgres?sslmode=disable"
+
+export XMTPD_REFLECTION_ENABLE=true
+export XMTPD_API_ENABLE=true
+export XMTPD_SYNC_ENABLE=true
+export XMTPD_INDEXER_ENABLE=true
+export XMTPD_CONTRACTS_ENVIRONMENT=anvil
+
+go run -ldflags="-X main.Version=$(git describe HEAD --tags --long)" cmd/replication/main.go -p 5052 "$@"

dev/run-no-chain

@@ -0,0 +1,23 @@
+#!/bin/bash
+# Run node with --no-blockchain experiment flags.
+# Usage: dev/run-no-chain [1|2|3] [extra-args...]
+#
+# Node 1 (port 5050, node ID 100): handles commits
+# Node 2 (port 5051, node ID 200): handles identity updates
+# Node 3 (port 5052, node ID 300): handles regular messages
+#
+# All nodes accept all message types with --no-blockchain.
+
+set -eu
+
+NODE=${1:-1}
+shift 2>/dev/null || true
+
+NO_CHAIN_FLAGS="--payer.no-blockchain --payer.commit-node-id=100 --payer.identity-node-id=200 --api.no-blockchain"
+
+case $NODE in
+  1) exec dev/run $NO_CHAIN_FLAGS "$@" ;;
+  2) exec dev/run-2 $NO_CHAIN_FLAGS "$@" ;;
+  3) exec dev/run-3 $NO_CHAIN_FLAGS "$@" ;;
+  *) echo "Unknown node: $NODE (use 1, 2, or 3)"; exit 1 ;;
+esac