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<ol class="chapter"><li class="chapter-item expanded "><a href="project-context-primer.html"><strong aria-hidden="true">1.</strong> Project Context Primer</a></li><li class="chapter-item expanded "><a href="what-you-will-learn.html"><strong aria-hidden="true">2.</strong> What You Will Learn</a></li><li class="chapter-item expanded "><a href="quickstart.html"><strong aria-hidden="true">3.</strong> Quickstart</a></li><li class="chapter-item expanded "><a href="part-i.html"><strong aria-hidden="true">4.</strong> Part I — Foundations</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="introduction.html"><strong aria-hidden="true">4.1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="architecture-overview.html" class="active"><strong aria-hidden="true">4.2.</strong> Architecture Overview</a></li><li class="chapter-item expanded "><a href="testing-philosophy.html"><strong aria-hidden="true">4.3.</strong> Testing Philosophy</a></li><li 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<h1 class="menu-title">Logos Blockchain Testing Framework Book</h1>
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<h1 id="architecture-overview"><a class="header" href="#architecture-overview">Architecture Overview</a></h1>
<p>The framework follows a clear flow: <strong>Topology → Scenario → Deployer → Runner → Workloads → Expectations</strong>.</p>
<h2 id="core-flow"><a class="header" href="#core-flow">Core Flow</a></h2>
<pre><code class="language-mermaid">flowchart LR
A(Topology&lt;br/&gt;shape cluster) --&gt; B(Scenario&lt;br/&gt;plan)
B --&gt; C(Deployer&lt;br/&gt;provision &amp; readiness)
C --&gt; D(Runner&lt;br/&gt;orchestrate execution)
D --&gt; E(Workloads&lt;br/&gt;drive traffic)
E --&gt; F(Expectations&lt;br/&gt;verify outcomes)
</code></pre>
<h2 id="crate-architecture"><a class="header" href="#crate-architecture">Crate Architecture</a></h2>
<pre><code class="language-mermaid">flowchart TB
subgraph Examples["Runner Examples"]
LocalBin[local_runner.rs]
ComposeBin[compose_runner.rs]
K8sBin[k8s_runner.rs]
CucumberBin[cucumber_*.rs]
end
subgraph Workflows["Workflows (Batteries Included)"]
DSL[ScenarioBuilderExt&lt;br/&gt;Fluent API]
TxWorkload[Transaction Workload]
DAWorkload[DA Workload]
ChaosWorkload[Chaos Workload]
Expectations[Built-in Expectations]
end
subgraph Core["Core Framework"]
ScenarioModel[Scenario Model]
Traits[Deployer + Runner Traits]
BlockFeed[BlockFeed]
NodeClients[Node Clients]
Topology[Topology Generation]
end
subgraph Deployers["Runner Implementations"]
LocalDeployer[LocalDeployer]
ComposeDeployer[ComposeDeployer]
K8sDeployer[K8sDeployer]
end
subgraph Support["Supporting Crates"]
Configs[Configs &amp; Topology]
Nodes[Node API Clients]
Cucumber[Cucumber Extensions]
end
Examples --&gt; Workflows
Examples --&gt; Deployers
Workflows --&gt; Core
Deployers --&gt; Core
Deployers --&gt; Support
Core --&gt; Support
Workflows --&gt; Support
style Examples fill:#e1f5ff
style Workflows fill:#e1ffe1
style Core fill:#fff4e1
style Deployers fill:#ffe1f5
style Support fill:#f0f0f0
</code></pre>
<h3 id="layer-responsibilities"><a class="header" href="#layer-responsibilities">Layer Responsibilities</a></h3>
<p><strong>Runner Examples (Entry Points)</strong></p>
<ul>
<li>Executable binaries that demonstrate framework usage</li>
<li>Wire together deployers, scenarios, and execution</li>
<li>Provide CLI interfaces for different modes</li>
</ul>
<p><strong>Workflows (High-Level API)</strong></p>
<ul>
<li><code>ScenarioBuilderExt</code> trait provides fluent DSL</li>
<li>Built-in workloads (transactions, DA, chaos)</li>
<li>Common expectations (liveness, inclusion)</li>
<li>Simplifies scenario authoring</li>
</ul>
<p><strong>Core Framework (Foundation)</strong></p>
<ul>
<li><code>Scenario</code> model and lifecycle orchestration</li>
<li><code>Deployer</code> and <code>Runner</code> traits (extension points)</li>
<li><code>BlockFeed</code> for real-time block observation</li>
<li><code>RunContext</code> providing node clients and metrics</li>
<li>Topology generation and validation</li>
</ul>
<p><strong>Runner Implementations</strong></p>
<ul>
<li><code>LocalDeployer</code> - spawns processes on host</li>
<li><code>ComposeDeployer</code> - orchestrates Docker Compose</li>
<li><code>K8sDeployer</code> - deploys to Kubernetes cluster</li>
<li>Each implements <code>Deployer</code> trait</li>
</ul>
<p><strong>Supporting Crates</strong></p>
<ul>
<li><code>configs</code> - Topology configuration and generation</li>
<li><code>nodes</code> - HTTP/RPC client for node APIs</li>
<li><code>cucumber</code> - BDD/Gherkin integration</li>
</ul>
<h3 id="extension-points"><a class="header" href="#extension-points">Extension Points</a></h3>
<pre><code class="language-mermaid">flowchart LR
Custom[Your Code] -.implements.-&gt; Workload[Workload Trait]
Custom -.implements.-&gt; Expectation[Expectation Trait]
Custom -.implements.-&gt; Deployer[Deployer Trait]
Workload --&gt; Core[Core Framework]
Expectation --&gt; Core
Deployer --&gt; Core
style Custom fill:#ffe1f5
style Core fill:#fff4e1
</code></pre>
<p><strong>Extend by implementing:</strong></p>
<ul>
<li><code>Workload</code> - Custom traffic generation patterns</li>
<li><code>Expectation</code> - Custom success criteria</li>
<li><code>Deployer</code> - Support for new deployment targets</li>
</ul>
<p>See <a href="extending.html">Extending the Framework</a> for details.</p>
<h3 id="components"><a class="header" href="#components">Components</a></h3>
<ul>
<li><strong>Topology</strong> describes the cluster: how many nodes, their roles, and the high-level network and data-availability parameters they should follow.</li>
<li><strong>Scenario</strong> combines that topology with the activities to run and the checks to perform, forming a single plan.</li>
<li><strong>Deployer</strong> provisions infrastructure on the chosen backend (local processes, Docker Compose, or Kubernetes), waits for readiness, and returns a Runner.</li>
<li><strong>Runner</strong> orchestrates scenario execution: starts workloads, observes signals, evaluates expectations, and triggers cleanup.</li>
<li><strong>Workloads</strong> generate traffic and conditions that exercise the system.</li>
<li><strong>Expectations</strong> observe the run and judge success or failure once activity completes.</li>
</ul>
<p>Each layer has a narrow responsibility so that cluster shape, deployment choice,
traffic generation, and health checks can evolve independently while fitting
together predictably.</p>
<h2 id="entry-points"><a class="header" href="#entry-points">Entry Points</a></h2>
<p>The framework is consumed via <strong>runnable example binaries</strong> in <code>examples/src/bin/</code>:</p>
<ul>
<li><code>local_runner.rs</code> — Spawns nodes as host processes</li>
<li><code>compose_runner.rs</code> — Deploys via Docker Compose (requires <code>NOMOS_TESTNET_IMAGE</code> built)</li>
<li><code>k8s_runner.rs</code> — Deploys via Kubernetes Helm (requires cluster + image)</li>
</ul>
<p><strong>Recommended:</strong> Use the convenience script:</p>
<pre><code class="language-bash">scripts/run/run-examples.sh -t &lt;duration&gt; -v &lt;validators&gt; -e &lt;executors&gt; &lt;mode&gt;
# mode: host, compose, or k8s
</code></pre>
<p>This handles circuit setup, binary building/bundling, image building, and execution.</p>
<p><strong>Alternative:</strong> Direct cargo run (requires manual setup):</p>
<pre><code class="language-bash">POL_PROOF_DEV_MODE=true cargo run -p runner-examples --bin &lt;name&gt;
</code></pre>
<p><strong>Important:</strong> All runners require <code>POL_PROOF_DEV_MODE=true</code> to avoid expensive Groth16 proof generation that causes timeouts.</p>
<p>These binaries use the framework API (<code>ScenarioBuilder</code>) to construct and execute scenarios.</p>
<h2 id="builder-api"><a class="header" href="#builder-api">Builder API</a></h2>
<p>Scenarios are defined using a fluent builder pattern:</p>
<pre><code class="language-rust ignore">use std::time::Duration;
use testing_framework_core::scenario::ScenarioBuilder;
use testing_framework_workflows::ScenarioBuilderExt;
pub fn scenario_plan() -&gt; testing_framework_core::scenario::Scenario&lt;()&gt; {
ScenarioBuilder::topology_with(|t| t.network_star().validators(3).executors(2))
.wallets(50)
.transactions_with(|txs| txs.rate(5).users(20))
.da_with(|da| da.channel_rate(1).blob_rate(2))
.expect_consensus_liveness()
.with_run_duration(Duration::from_secs(90))
.build()
}</code></pre>
<p><strong>Key API Points:</strong></p>
<ul>
<li>Topology uses <code>.topology_with(|t| { t.validators(N).executors(M) })</code> closure pattern</li>
<li>Workloads are configured via <code>_with</code> closures (<code>transactions_with</code>, <code>da_with</code>, <code>chaos_with</code>)</li>
<li>Chaos workloads require <code>.enable_node_control()</code> and a compatible runner</li>
</ul>
<h2 id="deployers"><a class="header" href="#deployers">Deployers</a></h2>
<p>Three deployer implementations:</p>
<div class="table-wrapper"><table><thead><tr><th>Deployer</th><th>Backend</th><th>Prerequisites</th><th>Node Control</th></tr></thead><tbody>
<tr><td><code>LocalDeployer</code></td><td>Host processes</td><td>Binaries (built on demand or via bundle)</td><td>No</td></tr>
<tr><td><code>ComposeDeployer</code></td><td>Docker Compose</td><td>Image with embedded assets/binaries</td><td>Yes</td></tr>
<tr><td><code>K8sDeployer</code></td><td>Kubernetes Helm</td><td>Cluster + image loaded</td><td>Not yet</td></tr>
</tbody></table>
</div>
<p><strong>Compose-specific features:</strong></p>
<ul>
<li>Observability is external (set <code>NOMOS_METRICS_QUERY_URL</code> / <code>NOMOS_METRICS_OTLP_INGEST_URL</code> / <code>NOMOS_GRAFANA_URL</code> as needed)</li>
<li>Optional OTLP trace/metrics endpoints (<code>NOMOS_OTLP_ENDPOINT</code>, <code>NOMOS_OTLP_METRICS_ENDPOINT</code>)</li>
<li>Node control for chaos testing (restart validators/executors)</li>
</ul>
<h2 id="assets-and-images"><a class="header" href="#assets-and-images">Assets and Images</a></h2>
<h3 id="docker-image"><a class="header" href="#docker-image">Docker Image</a></h3>
<p>Built via <code>scripts/build/build_test_image.sh</code>:</p>
<ul>
<li>Embeds KZG circuit parameters and binaries from <code>testing-framework/assets/stack/kzgrs_test_params/kzgrs_test_params</code></li>
<li>Includes runner scripts: <code>run_nomos_node.sh</code>, <code>run_nomos_executor.sh</code></li>
<li>Tagged as <code>NOMOS_TESTNET_IMAGE</code> (default: <code>logos-blockchain-testing:local</code>)</li>
<li><strong>Recommended:</strong> Use prebuilt bundle via <code>scripts/build/build-bundle.sh --platform linux</code> and set <code>NOMOS_BINARIES_TAR</code> before building image</li>
</ul>
<h3 id="circuit-assets"><a class="header" href="#circuit-assets">Circuit Assets</a></h3>
<p>KZG parameters required for DA workloads:</p>
<ul>
<li><strong>Host path:</strong> <code>testing-framework/assets/stack/kzgrs_test_params/kzgrs_test_params</code> (note repeated filename—directory contains file <code>kzgrs_test_params</code>)</li>
<li><strong>Container path:</strong> <code>/kzgrs_test_params/kzgrs_test_params</code> (for compose/k8s)</li>
<li><strong>Override:</strong> <code>NOMOS_KZGRS_PARAMS_PATH=/custom/path/to/file</code> (must point to file)</li>
<li><strong>Fetch via:</strong> <code>scripts/setup/setup-nomos-circuits.sh v0.3.1 /tmp/circuits</code> or use <code>scripts/run/run-examples.sh</code></li>
</ul>
<h3 id="compose-stack"><a class="header" href="#compose-stack">Compose Stack</a></h3>
<p>Templates and configs in <code>testing-framework/runners/compose/assets/</code>:</p>
<ul>
<li><code>docker-compose.yml.tera</code> — Stack template (validators, executors)</li>
<li>Cfgsync config: <code>testing-framework/assets/stack/cfgsync.yaml</code></li>
<li>Monitoring assets (not deployed by the framework): <code>testing-framework/assets/stack/monitoring/</code></li>
</ul>
<h2 id="logging-architecture"><a class="header" href="#logging-architecture">Logging Architecture</a></h2>
<p><strong>Two separate logging pipelines:</strong></p>
<div class="table-wrapper"><table><thead><tr><th>Component</th><th>Configuration</th><th>Output</th></tr></thead><tbody>
<tr><td><strong>Runner binaries</strong></td><td><code>RUST_LOG</code></td><td>Framework orchestration logs</td></tr>
<tr><td><strong>Node processes</strong></td><td><code>NOMOS_LOG_LEVEL</code>, <code>NOMOS_LOG_FILTER</code> (+ <code>NOMOS_LOG_DIR</code> on host runner)</td><td>Consensus, DA, mempool logs</td></tr>
</tbody></table>
</div>
<p><strong>Node logging:</strong></p>
<ul>
<li><strong>Local runner:</strong> Writes to temporary directories by default (cleaned up). Set <code>NOMOS_TESTS_TRACING=true</code> + <code>NOMOS_LOG_DIR</code> for persistent files.</li>
<li><strong>Compose runner:</strong> Default logs to container stdout/stderr (<code>docker logs</code>). To write per-node files, set <code>tracing_settings.logger: !File</code> in <code>testing-framework/assets/stack/cfgsync.yaml</code> (and mount a writable directory).</li>
<li><strong>K8s runner:</strong> Logs to pod stdout/stderr (<code>kubectl logs</code>). To write per-node files, set <code>tracing_settings.logger: !File</code> in <code>testing-framework/assets/stack/cfgsync.yaml</code> (and mount a writable directory).</li>
</ul>
<p><strong>File naming:</strong> Per-node files use prefix <code>nomos-node-{index}</code> or <code>nomos-executor-{index}</code> (may include timestamps).</p>
<h2 id="observability"><a class="header" href="#observability">Observability</a></h2>
<p><strong>Prometheus-compatible metrics querying (optional):</strong></p>
<ul>
<li>The framework does <strong>not</strong> deploy Prometheus/Grafana.</li>
<li>Provide a Prometheus-compatible base URL (PromQL API) via <code>NOMOS_METRICS_QUERY_URL</code>.</li>
<li>Accessible in expectations when configured: <code>ctx.telemetry().prometheus().map(|p| p.base_url())</code></li>
</ul>
<p><strong>Grafana dashboards (optional):</strong></p>
<ul>
<li>Dashboards live in <code>testing-framework/assets/stack/monitoring/grafana/dashboards/</code> and can be imported into your Grafana.</li>
<li>If you set <code>NOMOS_GRAFANA_URL</code>, the deployer prints it in <code>TESTNET_ENDPOINTS</code>.</li>
</ul>
<p><strong>Node APIs:</strong></p>
<ul>
<li>HTTP endpoints per node for consensus info, network status, DA membership</li>
<li>Accessible in expectations: <code>ctx.node_clients().validator_clients().get(0)</code></li>
</ul>
<p><strong>OTLP (optional):</strong></p>
<ul>
<li>Trace endpoint: <code>NOMOS_OTLP_ENDPOINT=http://localhost:4317</code></li>
<li>Metrics endpoint: <code>NOMOS_OTLP_METRICS_ENDPOINT=http://localhost:4318</code></li>
<li>Disabled by default (no noise if unset)</li>
</ul>
<p>For detailed logging configuration, see <a href="logging-observability.html">Logging &amp; Observability</a>.</p>
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