LiveView Dashboard

Overview

Lasso’s LiveView dashboard provides real-time visibility into RPC routing, provider health, and cluster-wide metrics through an interactive web interface. The dashboard aggregates data from all cluster nodes and presents a unified view of the entire system.

Accessing the Dashboard

The dashboard is available at:

http://localhost:4000/dashboard

Multi-profile deployments can access specific profiles:

http://localhost:4000/dashboard/{profile}

Dashboard Architecture

EventStream Aggregation

The dashboard uses a per-profile EventStream GenServer that consolidates all real-time events into batched updates, eliminating subscription explosion in multi-chain deployments. EventStream responsibilities:

Subscribes to PubSub topics for all chains in a profile
Batches events every 175ms for efficient LiveView updates
Deduplicates routing events by request ID
Computes per-provider metrics in real-time
Tracks circuit breaker states across the cluster

Subscribed PubSub topics (per profile):

Topic Pattern	Description
`routing_decision:{profile}`	RPC routing decisions
`circuit:events:{profile}:{chain}`	Circuit breaker state transitions
`block_sync:{profile}:{chain}`	Block height updates
`provider:events:{profile}:{chain}`	Provider health changes
`cluster:topology`	Cluster membership changes
`sync:updates:{profile}`	Sync status updates

Message Flow

PubSub Events → EventStream (per profile)
                      ↓
            Batch aggregation (175ms)
                      ↓
            {:dashboard_batch, ...}
                      ↓
                 LiveViews

Batch structure:

%{
  health: %{},                    # Provider health counters
  circuit_states: %{},            # Latest circuit states
  block_states: %{},              # Block heights and lag
  cluster: %{},                   # Cluster topology
  metrics: %{},                   # Per-provider RPS/latency/success
  routing_events: [],             # RPC routing decisions
  circuit_events: [],             # Circuit transitions
  provider_events: [],            # Provider health events
  subscription_events: [],        # WebSocket subscription events
  block_events: [],               # New block notifications
  heartbeat: false                # Staleness prevention
}

Initial Snapshot

On subscription, EventStream sends a complete snapshot of current state:

{:dashboard_snapshot, %{
  metrics: provider_metrics,
  circuits: circuit_states,
  health_counters: health_counters,
  cluster: cluster_state,
  events: recent_events
}}

Dashboard Tabs

Overview Tab

Interactive network topology showing:

Chain nodes with provider counts and status indicators
Provider nodes with circuit breaker states and health
Live request animations flowing from chains to providers
Details panel with real-time metrics for selected chain/provider

Status indicators:

Color	Status	Meaning
Green	Healthy	Circuit closed, passing health checks
Yellow	Degraded	Recent failures, half-open circuit
Red	Down	Circuit open, failing health checks
Gray	Unknown	No recent data

Metrics Tab

Cluster-wide performance metrics powered by MetricsStore:

Provider leaderboard (sorted by score)
Per-method performance with percentiles
Success rates and average latency
Multi-region comparison

Metrics are cached for 15 seconds with stale-while-revalidate semantics.

System Tab

VM-level metrics (when LASSO_VM_METRICS_ENABLED=true):

Memory usage
Process counts
Scheduler utilization
Message queue lengths

Cluster-Wide Metrics

MetricsStore

Caches aggregated metrics from all cluster nodes using :rpc.multicall/5. Configuration:

@cache_ttl_ms 15_000           # 15-second cache lifetime
@refresh_timeout_ms 5_000      # RPC timeout per node

Cache operations:

# Provider leaderboard (all nodes)
MetricsStore.get_provider_leaderboard("default", "ethereum")
# => %{
#   data: [
#     %{
#       provider_id: "ethereum_llamarpc",
#       score: 0.95,
#       avg_latency_ms: 120,
#       success_rate: 0.99,
#       total_calls: 1500,
#       node_count: 3,
#       latency_by_node: %{
#         "us-east-1" => %{p50: 100, p95: 180, p99: 250},
#         "eu-west-1" => %{p50: 140, p95: 220, p99: 300}
#       }
#     }
#   ],
#   coverage: %{responding: 3, total: 3},
#   stale: false
# }

# Real-time stats (all nodes)
MetricsStore.get_realtime_stats("default", "ethereum")
# => %{
#   data: %{
#     rpc_methods: ["eth_blockNumber", "eth_getLogs"],
#     providers: ["ethereum_llamarpc", "ethereum_alchemy"],
#     total_entries: 5000,
#     node_count: 3
#   },
#   coverage: %{responding: 3, total: 3},
#   stale: false
# }

Aggregation Logic

Metrics are weighted by call volume across nodes:

# Weighted average latency
weighted_avg = 
  Enum.map(entries, fn entry ->
    entry.avg_latency_ms * entry.total_calls
  end)
  |> Enum.sum()
  |> safe_divide(total_calls_across_all_nodes)

Minimum call threshold: Providers need ≥10 calls to be included in aggregates (prevents skew from cold-start nodes).

Cache Invalidation

MetricsStore invalidates all cached entries on topology changes:

Phoenix.PubSub.subscribe(Lasso.PubSub, "cluster:topology")

def handle_info({:topology_event, %{event: event}}, state)
    when event in [:node_connected, :node_disconnected] do
  :ets.delete_all_objects(@cache_table)
  {:noreply, %{state | generation: state.generation + 1}}
end

Generation counter prevents stale completions from pre-invalidation async tasks.

Real-Time Provider Metrics

EventStream computes per-provider metrics from routing events:

%{
  provider_id: "ethereum_llamarpc",
  rps: 15.3,                    # Requests per second (rolling 60s)
  avg_latency_ms: 125,          # Weighted average
  success_rate: 0.98,           # Success / total
  total_calls: 920,             # Rolling window
  failovers: 3,                 # Failover count
  last_request_ms: 1234567890   # Timestamp
}

Computation window: 60 seconds (configurable via @window_duration_ms).

Cluster Status Indicator

Fixed bottom-right indicator showing cluster health:

┌─────────────────────────┐
│  Cluster: 3/3 nodes     │  ← All nodes responding
│  Updated 2s ago         │
└─────────────────────────┘

Staleness detection:

Updates marked stale after 30 seconds without new data
Stale indicator shown when last_update > 30s
Heartbeat messages every 2 seconds prevent false staleness

Network Topology Visualization

Canvas Layout

Providers positioned using force-directed graph algorithm:

# lib/lasso_web/network_topology.ex
TopologyConfig.canvas_center()  # => {960, 540}

Node types:

Chain nodes (left side): Octagon shapes
Provider nodes (right side): Circles with status colors

Request Animations

Live requests visualized as particles flowing from chain to provider:

// Client-side hook: ProviderRequestAnimator
window.addEventListener('routing_decision', (event) => {
  animateRequest(event.detail.chain, event.detail.provider_id);
});

Performance Optimizations

Event Batching

EventStream batches up to 100 events or waits 175ms before flushing:

@batch_interval_ms 175
@max_batch_size 100

Benefits:

Reduces LiveView messages from thousands/sec to ~6/sec
Coalesces state updates (latest-wins for health, circuits, blocks)
O(1) deduplication using seen_request_ids map

Lazy Ticking

EventStream only schedules tick timers when subscribers exist:

def handle_cast({:subscribe, pid, account_id}, state) do
  subscribers = MapSet.put(state.subscribers, pid)
  Process.monitor(pid)
  
  # Start ticking if first subscriber
  state = if MapSet.size(subscribers) == 1 do
    schedule_tick(state)
  else
    state
  end
  
  send(pid, {:dashboard_snapshot, build_snapshot(state)})
  {:noreply, %{state | subscribers: subscribers}}
end

Idle termination: EventStream terminates after 30 seconds with no subscribers (transient restart).

Deduplication

Request IDs cached for 2 minutes to prevent duplicate routing events:

@seen_request_id_ttl_ms 120_000
@max_seen_request_ids 50_000

# O(1) dedup check before processing
if Map.has_key?(state.seen_request_ids, event.request_id) do
  {:noreply, state}
else
  # Process event...
end

Configuration

Dashboard Settings

# config/config.exs
config :lasso_web, LassoWeb.Dashboard,
  event_history_size: 500,        # Max events in memory
  recent_blocks_limit: 100,       # Max block events
  provider_events_limit: 200      # Max provider events

EventStream Tuning

config :lasso_web, LassoWeb.Dashboard.EventStream,
  batch_interval_ms: 175,         # Flush frequency
  max_batch_size: 100,            # Immediate flush threshold
  window_duration_ms: 60_000,     # Metrics rolling window
  idle_timeout_ms: 30_000         # Terminate when no subscribers

MetricsStore Tuning

config :lasso_web, LassoWeb.Dashboard.MetricsStore,
  cache_ttl_ms: 15_000,           # Cache lifetime
  refresh_timeout_ms: 5_000,      # RPC timeout
  min_calls_threshold: 10         # Minimum calls for aggregation

Troubleshooting

Dashboard Not Updating

Symptom: Cluster status shows “stale” or metrics frozen. Check EventStream status:

iex> Registry.lookup(Lasso.Dashboard.StreamRegistry, {:stream, "default"})
[{#PID<0.1234.0>, nil}]  # Should return a PID

Verify PubSub subscriptions:

iex> Phoenix.PubSub.subscribers(Lasso.PubSub, "routing_decision:default")
[#PID<0.1234.0>]  # EventStream should be subscribed

Metrics Not Aggregating

Symptom: Cluster metrics show 1/3 nodes or coverage errors. Check cluster topology:

iex> Lasso.Cluster.Topology.get_responding_nodes()
[:node2@host, :node3@host]  # Should list remote nodes

iex> Lasso.Cluster.Topology.get_coverage()
%{connected: 3, responding: 3}  # All nodes healthy

Check RPC connectivity:

iex> :rpc.multicall([node()], Lasso.Benchmarking.BenchmarkStore, :get_provider_leaderboard, ["default", "ethereum"], 5000)
{[results], []}  # Empty bad_nodes list = success

High Memory Usage

Symptom: EventStream memory growing unbounded. Check event counts:

iex> :sys.get_state(pid)
%EventStream{
  seen_request_ids: %{...},  # Should be < 50,000 entries
  circuit_states: %{...},    # Should be < 500 entries
  block_heights: %{...}      # Should be < 500 entries
}

Cleanup runs automatically:

seen_request_ids cleaned every 5 seconds
circuit_states and block_heights cleaned every 30 seconds

Summary

Lasso’s dashboard provides:

Real-time aggregation via EventStream (175ms batching)
Cluster-wide metrics via MetricsStore (15s cache, stale-while-revalidate)
Multi-region visibility with per-node latency breakdown
Interactive topology with live request animations
Efficient updates through batching, coalescing, and deduplication
Automatic scaling with lazy ticking and idle termination

Get Started

Core Concepts

Configuration

Deployment

Observability

Advanced

LiveView Dashboard

Overview

Accessing the Dashboard

Dashboard Architecture

EventStream Aggregation

Message Flow

Initial Snapshot

Dashboard Tabs

Overview Tab

Metrics Tab

System Tab

Cluster-Wide Metrics

MetricsStore

Aggregation Logic

Cache Invalidation

Real-Time Provider Metrics

Cluster Status Indicator

Network Topology Visualization

Canvas Layout

Request Animations

Performance Optimizations

Event Batching

Lazy Ticking

Deduplication

Configuration

Dashboard Settings

EventStream Tuning

MetricsStore Tuning

Troubleshooting

Dashboard Not Updating

Metrics Not Aggregating

High Memory Usage

Summary

Get Started

Core Concepts

Configuration

Deployment

Observability

Advanced

​Overview

​Accessing the Dashboard

​Dashboard Architecture

​EventStream Aggregation

​Message Flow

​Initial Snapshot

​Dashboard Tabs

​Overview Tab

​Metrics Tab

​System Tab

​Cluster-Wide Metrics

​MetricsStore

​Aggregation Logic

​Cache Invalidation

​Real-Time Provider Metrics

​Cluster Status Indicator

​Network Topology Visualization

​Canvas Layout

​Request Animations

​Performance Optimizations

​Event Batching

​Lazy Ticking

​Deduplication

​Configuration

​Dashboard Settings

​EventStream Tuning

​MetricsStore Tuning

​Troubleshooting

​Dashboard Not Updating

​Metrics Not Aggregating

​High Memory Usage

​Summary

Overview

Accessing the Dashboard

Dashboard Architecture

EventStream Aggregation

Message Flow

Initial Snapshot

Dashboard Tabs

Overview Tab

Metrics Tab

System Tab

Cluster-Wide Metrics

MetricsStore

Aggregation Logic

Cache Invalidation

Real-Time Provider Metrics

Cluster Status Indicator

Network Topology Visualization

Canvas Layout

Request Animations

Performance Optimizations

Event Batching

Lazy Ticking

Deduplication

Configuration

Dashboard Settings

EventStream Tuning

MetricsStore Tuning

Troubleshooting

Dashboard Not Updating

Metrics Not Aggregating

High Memory Usage

Summary