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280 lines
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<ol class="chapter"><li class="chapter-item expanded "><a href="index.html"><strong aria-hidden="true">1.</strong> Overview</a></li><li class="chapter-item expanded "><a href="howto/index.html"><strong aria-hidden="true">2.</strong> Instructions</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="howto/dev.html"><strong aria-hidden="true">2.1.</strong> Developer guide</a></li><li class="chapter-item expanded "><a href="howto/map_parking.html"><strong aria-hidden="true">2.2.</strong> How to map on-street parking</a></li><li class="chapter-item expanded "><a href="howto/new_city.html"><strong aria-hidden="true">2.3.</strong> Importing a new city</a></li><li class="chapter-item expanded "><a href="howto/misc_dev_tricks.html"><strong aria-hidden="true">2.4.</strong> Misc developer tricks</a></li></ol></li><li class="chapter-item expanded "><a href="how_it_works.html"><strong aria-hidden="true">3.</strong> How it works</a></li><li class="chapter-item expanded "><a href="map/index.html"><strong aria-hidden="true">4.</strong> Map model</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="map/importing/index.html"><strong aria-hidden="true">4.1.</strong> Importing</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="map/importing/convert_osm.html"><strong aria-hidden="true">4.1.1.</strong> convert_osm</a></li><li class="chapter-item expanded "><a href="map/importing/geometry.html"><strong aria-hidden="true">4.1.2.</strong> Road/intersection geometry</a></li><li class="chapter-item expanded "><a href="map/importing/rest.html"><strong aria-hidden="true">4.1.3.</strong> The rest</a></li></ol></li><li class="chapter-item expanded "><a href="map/edits.html"><strong aria-hidden="true">4.2.</strong> Live edits</a></li><li class="chapter-item expanded "><a href="map/misc.html"><strong aria-hidden="true">4.3.</strong> Misc</a></li></ol></li><li class="chapter-item expanded "><a href="trafficsim/index.html"><strong aria-hidden="true">5.</strong> Traffic simulation</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="trafficsim/discrete_event.html"><strong aria-hidden="true">5.1.</strong> Discrete event simulation</a></li><li class="chapter-item expanded "><a href="trafficsim/travel_demand.html"><strong aria-hidden="true">5.2.</strong> Travel demand</a></li><li class="chapter-item expanded "><a href="trafficsim/gridlock.html"><strong aria-hidden="true">5.3.</strong> Gridlock</a></li></ol></li><li class="chapter-item expanded "><a href="case_studies/index.html"><strong aria-hidden="true">6.</strong> Case studies</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="case_studies/lake_wash.html"><strong aria-hidden="true">6.1.</strong> Lake Washington Blvd Stay Healthy Street</a></li><li class="chapter-item expanded "><a href="case_studies/west_seattle.html"><strong aria-hidden="true">6.2.</strong> West Seattle mitigations</a></li></ol></li><li class="chapter-item expanded "><a href="api.html" class="active"><strong aria-hidden="true">7.</strong> API</a></li><li class="chapter-item expanded "><a href="project/index.html"><strong aria-hidden="true">8.</strong> Project</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="project/roadmap.html"><strong aria-hidden="true">8.1.</strong> Roadmap</a></li><li class="chapter-item expanded "><a href="project/motivations.html"><strong aria-hidden="true">8.2.</strong> Motivations</a></li><li class="chapter-item expanded "><a href="project/history/index.html"><strong aria-hidden="true">8.3.</strong> History</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="project/history/backstory.html"><strong aria-hidden="true">8.3.1.</strong> Backstory</a></li><li class="chapter-item expanded "><a href="project/history/year1.html"><strong aria-hidden="true">8.3.2.</strong> Year 1</a></li><li class="chapter-item expanded "><a href="project/history/year2.html"><strong aria-hidden="true">8.3.3.</strong> Year 2</a></li><li class="chapter-item expanded "><a href="project/history/year3.html"><strong aria-hidden="true">8.3.4.</strong> Year 3</a></li></ol></li><li class="chapter-item expanded "><a href="project/CHANGELOG.html"><strong aria-hidden="true">8.4.</strong> Full CHANGELOG</a></li><li class="chapter-item expanded "><a href="project/references.html"><strong aria-hidden="true">8.5.</strong> References</a></li></ol></li></ol>
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<h1 class="menu-title">A/B Street</h1>
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<h1><a class="header" href="#api" id="api">API</a></h1>
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<p>Suppose you're tired of manually fiddling with traffic signals, and you want to
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use machine learning to do it. You can run A/B Street without graphics and
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automatically control it through an API.</p>
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<h2><a class="header" href="#example" id="example">Example</a></h2>
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<p>This
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<a href="https://github.com/dabreegster/abstreet/blob/master/headless/examples/python_client.py">Python example</a>
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has everything you need to get started.</p>
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<h2><a class="header" href="#api-details" id="api-details">API details</a></h2>
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<blockquote>
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<p><strong>Under construction</strong>: The API will keep changing. There are no backwards
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compatibility guarantees yet. Please make sure I know about your project, so I
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don't break your client code.</p>
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</blockquote>
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<p>For now, the API is JSON over HTTP. The exact format is unspecified, error codes
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are missing, etc. A summary of the commands available so far:</p>
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<ul>
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<li><strong>/sim</strong>
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<ul>
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<li><strong>GET /sim/reset</strong>: Reset all map edits and the simulation state. The trips
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that will run don't change; they're determined by the scenario file you
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initially pass to <code>headless</code>.</li>
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<li><strong>GET /sim/get-time</strong>: Returns the current simulation time.</li>
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<li><strong>GET /sim/goto-time?t=06:30:00</strong>: Simulate until 6:30 AM. If the time you
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specify is before the current time, you have to call <strong>/sim/reset</strong> first.</li>
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</ul>
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</li>
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<li><strong>/traffic-signals</strong>
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<ul>
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<li><strong>GET /traffic-signals/get?id=42</strong>: Returns the traffic signal of
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intersection #42 in JSON.</li>
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<li><strong>POST /traffic-signals/set</strong>: The POST body must be a traffic signal in
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JSON format.</li>
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<li><strong>GET /traffic-signals/get-delays?id=42&t1=03:00:00&t2=03:30:00</strong>: Returns
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the delay experienced by every agent passing through intersection #42 from
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3am to 3:30, grouped by direction of travel.</li>
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<li><strong>GET /traffic-signals/get-cumulative-thruput?id=42</strong>: Returns the number of
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agents passing through intersection #42 since midnight, grouped by direction
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of travel.</li>
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</ul>
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</li>
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<li><strong>/data</strong>
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<ul>
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<li><strong>GET /data/get-finished-trips</strong>: Returns a JSON list of all finished trips.
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Each tuple is (time the trip finished in seconds after midnight, trip ID,
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mode, duration of trip in seconds). The mode is either a string like "Walk"
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or "Drive", or null if the trip was aborted (due to a simulation bug or
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disconnected map).</li>
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</ul>
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</li>
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</ul>
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<h2><a class="header" href="#related-tools" id="related-tools">Related tools</a></h2>
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<p>There's no API to create trips. Instead, you can
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<a href="https://dabreegster.github.io/abstreet/trafficsim/travel_demand.html#custom-import">import trips from your own data</a>.</p>
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<p>If you need to deeply inspect the map, you can dump it to JSON:</p>
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<pre><code>cargo run --bin iotool -- dump_map --map=data/system/maps/montlake.bin
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</code></pre>
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<p>The format of the map isn't well-documented yet. See the
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<a href="https://dabreegster.github.io/abstreet/rustdoc/map_model/index.html">generated API docs</a>
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and <a href="https://dabreegster.github.io/abstreet/map/index.html">the map model docs</a>
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in the meantime.</p>
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