13521016993

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4.22

/SpiNNaker-comms/src/main/java/uk/ac/manchester/spinnaker/alloc/client/SpallocClientFactory.java

/*
 * Copyright (c) 2021 The University of Manchester
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package uk.ac.manchester.spinnaker.alloc.client;

import static com.fasterxml.jackson.databind.PropertyNamingStrategies.KEBAB_CASE;
import static com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS;
import static java.lang.Integer.toUnsignedString;
import static java.lang.String.format;
import static java.lang.Thread.sleep;
import static java.net.HttpURLConnection.HTTP_BAD_REQUEST;
import static java.net.HttpURLConnection.HTTP_NOT_FOUND;
import static java.net.HttpURLConnection.HTTP_NO_CONTENT;
import static java.net.URLEncoder.encode;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.nio.ByteOrder.LITTLE_ENDIAN;
import static java.util.Collections.synchronizedMap;
import static java.util.Objects.isNull;
import static java.util.Objects.nonNull;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;
import static org.apache.commons.io.IOUtils.readLines;
import static org.slf4j.LoggerFactory.getLogger;
import static uk.ac.manchester.spinnaker.alloc.client.ClientUtils.asDir;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Stream;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;

import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.google.errorprone.annotations.MustBeClosed;
import com.google.errorprone.annotations.concurrent.GuardedBy;

import uk.ac.manchester.spinnaker.alloc.client.SpallocClient.Job;
import uk.ac.manchester.spinnaker.alloc.client.SpallocClient.Machine;
import uk.ac.manchester.spinnaker.alloc.client.SpallocClient.SpallocException;
import uk.ac.manchester.spinnaker.machine.ChipLocation;
import uk.ac.manchester.spinnaker.machine.CoreLocation;
import uk.ac.manchester.spinnaker.machine.HasChipLocation;
import uk.ac.manchester.spinnaker.machine.MemoryLocation;
import uk.ac.manchester.spinnaker.machine.board.PhysicalCoords;
import uk.ac.manchester.spinnaker.machine.board.TriadCoords;
import uk.ac.manchester.spinnaker.machine.tags.IPTag;
import uk.ac.manchester.spinnaker.messages.model.Version;
import uk.ac.manchester.spinnaker.storage.ProxyInformation;
import uk.ac.manchester.spinnaker.transceiver.SpinnmanException;
import uk.ac.manchester.spinnaker.transceiver.TransceiverInterface;
import uk.ac.manchester.spinnaker.utils.Daemon;

/**
 * A factory for clients to connect to the Spalloc service.
 * <p>
 * <strong>Implementation Note:</strong> Neither this class nor the client
 * classes it creates maintain state that needs to be closed explicitly
 * <em>except</em> for
 * {@linkplain SpallocClient.Job#getTransceiver() transceivers}, as transceivers
 * usually need to be closed.
 *
 * @author Donal Fellows
 */
public class SpallocClientFactory {
        private static final Logger log = getLogger(SpallocClientFactory.class);

        private static final String CONTENT_TYPE = "Content-Type";

        private static final String TEXT_PLAIN = "text/plain; charset=UTF-8";

        private static final String APPLICATION_JSON = "application/json";

        private static final String FORM_ENCODED =
                        "application/x-www-form-urlencoded";

        private static final URI KEEPALIVE = URI.create("keepalive");

        private static final URI MACHINE = URI.create("machine");

        private static final URI POWER = URI.create("power");

        private static final URI WAIT_FLAG = URI.create("?wait=true");

        private static final URI MEMORY = URI.create("memory");

        private static final URI FAST_DATA_WRITE = URI.create("fast-data-write");

        private static final URI FAST_DATA_READ = URI.create("fast-data-read");

        // Amount to divide keepalive interval by to get actual keep alive delay
        private static final int KEEPALIVE_DIVIDER = 2;

        /** Used to convert to/from JSON. */
        static final JsonMapper JSON_MAPPER = JsonMapper.builder()
                        .findAndAddModules().disable(WRITE_DATES_AS_TIMESTAMPS)
                        .addModule(new JavaTimeModule())
                        .propertyNamingStrategy(KEBAB_CASE).build();

        private final URI baseUrl;

        /**
         * Cache of machines, which don't expire.
         */
        private static final Map<String, Machine> MACHINE_MAP =
                        synchronizedMap(new HashMap<>());

        /**
         * Create a factory that can talk to a given service.
         *
         * @param baseUrl
         *            Where the server is.
         */
        public SpallocClientFactory(URI baseUrl) {
                this.baseUrl = asDir(baseUrl);
        }

        /**
         * Get a handle to a job given its proxy access information (derived from a
         * database query).
         *
         * @param proxy
         *            The proxy information from the database. Handles {@code null}.
         * @return The job handle, or {@code null} if {@code proxy==null}.
         * @throws IOException
         *             If connecting to the job fails.
         */
        public static Job getJobFromProxyInfo(ProxyInformation proxy)
                        throws IOException {
                if (proxy == null) {
                        return null;
                }
                log.info("Using proxy {} for connections", proxy.spallocUrl);
                return new SpallocClientFactory(URI.create(proxy.spallocUrl))
                                .getJob(proxy.jobUrl, proxy.headers, proxy.cookies);
        }

        /**
         * Read an object from a stream.
         *
         * @param <T>
         *            The type of the object to read.
         * @param is
         *            The stream
         * @param cls
         *            The class of object to read.
         * @return The object
         * @throws IOException
         *             If an I/O error happens or the content on the stream can't be
         *             made into an instance of the given class.
         */
        static <T> T readJson(InputStream is, Class<T> cls) throws IOException {
                BufferedReader streamReader = new BufferedReader(
                                new InputStreamReader(is, "UTF-8"));
                StringBuilder responseStrBuilder = new StringBuilder();

                String inputStr;
                while ((inputStr = streamReader.readLine()) != null) {
                        responseStrBuilder.append(inputStr);
                }
                String json = responseStrBuilder.toString();

                try {
                        return JSON_MAPPER.readValue(json, cls);
                } catch (IOException e) {
                        log.error("Error while reading json {}", json);
                        throw e;
                }
        }

        /**
         * Outputs a form to a connection in
         * {@code application/x-www-form-urlencoded} format.
         *
         * @param connection
         *            The connection. Must have the right verb set.
         * @param map
         *            The contents of the form.
         * @throws IOException
         *             If I/O fails.
         */
        static void writeForm(HttpURLConnection connection, Map<String, String> map)
                        throws IOException {
                var form = map.entrySet().stream()
                                .map(e -> e.getKey() + "=" + encode(e.getValue(), UTF_8))
                                .collect(joining("&"));

                connection.setDoOutput(true);
                connection.setRequestProperty(CONTENT_TYPE, FORM_ENCODED);
                try (var w =
                                new OutputStreamWriter(connection.getOutputStream(), UTF_8)) {
                        w.write(form);
                }
        }

        /**
         * Outputs an object to a connection in {@code application/json} format.
         *
         * @param connection
         *            The connection. Must have the right verb set.
         * @param object
         *            The object to write.
         * @throws IOException
         *             If I/O fails.
         */
        static void writeObject(HttpURLConnection connection, Object object)
                        throws IOException {
                connection.setDoOutput(true);
                connection.setRequestProperty(CONTENT_TYPE, APPLICATION_JSON);
                try (var out = connection.getOutputStream()) {
                        JSON_MAPPER.writeValue(out, object);
                }
        }

        /**
         * Outputs a string to a connection in {@code text/plain} format.
         *
         * @param connection
         *            The connection. Must have the right verb set.
         * @param string
         *            The string to write.
         * @throws IOException
         *             If I/O fails.
         */
        static void writeString(HttpURLConnection connection, String string)
                        throws IOException {
                connection.setDoOutput(true);
                connection.setRequestProperty(CONTENT_TYPE, TEXT_PLAIN);
                try (var w = new OutputStreamWriter(connection.getOutputStream(),
                                UTF_8)) {
                        w.write(string);
                }
        }

        /**
         * Checks for errors in the response.
         *
         * @param conn
         *            The HTTP connection
         * @param errorMessage
         *            The message to use on error (describes what did not work at a
         *            higher level)
         * @return The input stream so any non-error response content can be
         *         obtained.
         * @throws IOException
         *             If things go wrong with comms.
         * @throws FileNotFoundException
         *             on a {@link HttpURLConnection#HTTP_NOT_FOUND}
         * @throws SpallocException
         *             on other server errors
         */
        @MustBeClosed
        static InputStream checkForError(HttpURLConnection conn,
                        String errorMessage) throws IOException {
                if (conn.getResponseCode() == HTTP_NOT_FOUND) {
                        // Special case
                        throw new FileNotFoundException(errorMessage);
                }
                if (conn.getResponseCode() >= HTTP_BAD_REQUEST) {
                        throw new SpallocException(conn.getErrorStream(),
                                        conn.getResponseCode());
                }
                return conn.getInputStream();
        }

        /**
         * Checks for errors in the response without expecting response content.
         *
         * @param conn
         *            The HTTP connection
         * @param errorMessage
         *            The message to use on error (describes what did not work at a
         *            higher level)
         * @throws IOException
         *             If things go wrong with comms.
         * @throws FileNotFoundException
         *             on a {@link HttpURLConnection#HTTP_NOT_FOUND}
         * @throws SpallocException
         *             on other server errors
         */
        static void checkForErrorNoResponse(HttpURLConnection conn,
                        String errorMessage) throws IOException {
                if (conn.getResponseCode() == HTTP_NOT_FOUND) {
                        // Special case
                        throw new FileNotFoundException(errorMessage);
                }
                if (conn.getResponseCode() >= HTTP_BAD_REQUEST) {
                        throw new SpallocException(conn.getErrorStream(),
                                        conn.getResponseCode());
                }
        }

        /**
         * Create a client and log in.
         *
         * @param username
         *            The username to log in with.
         * @param password
         *            The password to log in with.
         * @return The client API for the given server.
         * @throws IOException
         *             If the server doesn't respond or logging in fails.
         */
        public SpallocClient login(String username, String password)
                        throws IOException {
                var s = new ClientSession(baseUrl, username, password);

                return new ClientImpl(s, s.discoverRoot());
        }

        /**
         * Get direct access to a Job.
         *
         * @param uri
         *            The URI of the job
         * @param headers
         *            The headers to read authentication from.
         * @param cookies
         *            The cookies to read authentication from.
         * @return A job.
         * @throws IOException
         *             If there is an error communicating with the server.
         */
        public Job getJob(String uri, Map<String, String> headers,
                        Map<String, String> cookies) throws IOException {
                var u = URI.create(uri);
                var s = new ClientSession(baseUrl, headers, cookies);
                var c = new ClientImpl(s, s.discoverRoot());
                log.info("Connecting to job on {}", u);
                return c.job(u);
        }

        private abstract static class Common {
                private final SpallocClient client;

                final Session s;

                Common(SpallocClient client, Session s) {
                        this.client = client != null ? client : (SpallocClient) this;
                        this.s = s;
                }

                final Machine getMachine(String name) throws IOException {
                        Machine m = MACHINE_MAP.get(name);
                        if (m == null) {
                                client.listMachines();
                                m = MACHINE_MAP.get(name);
                        }
                        if (m == null) {
                                throw new IOException("Machine " + name + " not found");
                        }
                        return m;
                }

                private WhereIs whereis(HttpURLConnection conn) throws IOException {
                        try (var is = checkForError(conn,
                                        "couldn't get board information")) {
                                if (conn.getResponseCode() == HTTP_NO_CONTENT) {
                                        throw new FileNotFoundException("machine not allocated");
                                }
                                return readJson(is, WhereIs.class);
                        } finally {
                                s.trackCookie(conn);
                        }
                }

                final WhereIs whereis(URI uri) throws IOException {
                        return s.withRenewal(() -> {
                                var conn = s.connection(uri);
                                var w = whereis(conn);
                                w.setMachineHandle(getMachine(w.getMachineName()));
                                w.clearMachineRef();
                                return w;
                        });
                }
        }

        private static final class ClientImpl extends Common
                        implements SpallocClient {
                private Version v;

                private URI jobs;

                private URI machines;

                private ClientImpl(Session s, RootInfo ri) throws IOException {
                        super(null, s);
                        this.v = ri.version;
                        this.jobs = asDir(ri.jobsURI);
                        this.machines = asDir(ri.machinesURI);
                }

                @Override
                public Version getVersion() {
                        return v;
                }

                /**
                 * Slightly convoluted class to fetch jobs. The complication means we
                 * get the initial failure exception nice and early, while we're ready
                 * for it. This code would be quite a lot simpler if we didn't want to
                 * get the exception during construction.
                 */
                private class JobLister extends ListFetchingIter<URI> {
                        private URI next;

                        private List<URI> first;

                        JobLister(URI initial) throws IOException {
                                var first = getJobList(s.connection(initial));
                                next = first.next;
                                this.first = first.jobs;
                        }

                        private Jobs getJobList(HttpURLConnection conn) throws IOException {
                                try (var is = checkForError(conn, "couldn't list jobs")) {
                                        return readJson(is, Jobs.class);
                                } finally {
                                        s.trackCookie(conn);
                                }
                        }

                        @Override
                        List<URI> fetchNext() throws IOException {
                                if (nonNull(first)) {
                                        try {
                                                return first;
                                        } finally {
                                                first = null;
                                        }
                                }
                                var j = getJobList(s.connection(next));
                                next = j.next;
                                return j.jobs;
                        }

                        @Override
                        boolean canFetchMore() {
                                if (nonNull(first)) {
                                        return true;
                                }
                                return nonNull(next);
                        }
                }

                private Stream<Job> listJobs(URI flags) throws IOException {
                        var basicData = new JobLister(
                                        nonNull(flags) ? jobs.resolve(flags) : jobs);
                        return basicData.stream().flatMap(Collection::stream)
                                        .map(this::job);
                }

                @Override
                public List<Job> listJobs(boolean wait) throws IOException {
                        return s.withRenewal(() -> listJobs(WAIT_FLAG)).collect(toList());
                }

                @Override
                public Stream<Job> listJobsWithDeleted(boolean wait)
                                throws IOException {
                        var opts = new StringBuilder("?deleted=true");
                        if (wait) {
                                opts.append("&wait=true");
                        }
                        return s.withRenewal(() -> listJobs(URI.create(opts.toString())));
                }

                @Override
                public Job createJob(CreateJob createInstructions) throws IOException {
                        var uri = s.withRenewal(() -> {
                                var conn = s.connection(jobs, true);
                                writeObject(conn, createInstructions);
                                // Get the response entity... and discard it
                                try (var is = checkForError(conn, "job create failed")) {
                                        readLines(is, UTF_8);
                                        // But we do want the Location header
                                        return URI.create(conn.getHeaderField("Location"));
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                        var job = job(uri);
                        job.startKeepalive(
                                        createInstructions.getKeepaliveInterval().toMillis()
                                        / KEEPALIVE_DIVIDER);
                        return job;
                }

                JobImpl job(URI uri) {
                        return new JobImpl(this, s, asDir(uri));
                }

                @Override
                public List<Machine> listMachines() throws IOException {
                        return s.withRenewal(() -> {
                                var conn = s.connection(machines);
                                try (var is = checkForError(conn, "list machines failed")) {
                                        var ms = readJson(is, Machines.class);
                                        // Assume we can cache this
                                        for (var bmd : ms.machines) {
                                                log.debug("Machine {} found", bmd.name);
                                                MACHINE_MAP.put(bmd.name,
                                                                new MachineImpl(this, s, bmd));
                                        }
                                        return new ArrayList<Machine>(MACHINE_MAP.values());
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                }
        }

        private static final class JobImpl extends Common implements Job {
                private final URI uri;

                private volatile boolean dead;

                @GuardedBy("lock")
                private ProxyProtocolClient proxy;

                private final Object lock = new Object();

                JobImpl(SpallocClient client, Session session, URI uri) {
                        super(client, session);
                        this.uri = uri;
                        this.dead = false;
                }

                @Override
                public JobDescription describe(boolean wait) throws IOException {
                        return s.withRenewal(() -> {
                                var conn = wait ? s.connection(uri, WAIT_FLAG)
                                                : s.connection(uri);
                                try (var is = checkForError(conn, "couldn't get job state")) {
                                        return readJson(is, JobDescription.class);
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                }

                @Override
                public void keepalive() throws IOException {
                        s.withRenewal(() -> {
                                var conn = s.connection(uri, KEEPALIVE, true);
                                conn.setRequestMethod("PUT");
                                writeString(conn, "alive");
                                try (var is = checkForError(conn, "couldn't keep job alive")) {
                                        return readLines(is, UTF_8);
                                        // Ignore the output
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                }

                public void startKeepalive(long delayMs) {
                        if (dead) {
                                throw new IllegalStateException("job is already deleted");
                        }
                        var t = new Daemon(() -> {
                                try {
                                        while (true) {
                                                sleep(delayMs);
                                                if (dead) {
                                                        break;
                                                }
                                                keepalive();
                                        }
                                } catch (IOException e) {
                                        log.warn("failed to keep job alive for {}", this, e);
                                } catch (InterruptedException e) {
                                        // If interrupted, we're simply done
                                }
                        });
                        t.setName("keepalive for " + uri);
                        t.setUncaughtExceptionHandler((th, e) -> {
                                log.warn("unexpected exception in {}", th, e);
                        });
                        t.start();
                }

                @Override
                public void delete(String reason) throws IOException {
                        dead = true;
                        s.withRenewal(() -> {
                                var conn = s.connection(uri, "?reason=" + encode(reason, UTF_8),
                                                true);
                                conn.setRequestMethod("DELETE");
                                try (var is = checkForError(conn, "couldn't delete job")) {
                                        readLines(is, UTF_8);
                                        // Ignore the output
                                } finally {
                                        s.trackCookie(conn);
                                }
                                return this;
                        });
                        synchronized (lock) {
                                if (haveProxy()) {
                                        proxy.close();
                                        proxy = null;
                                }
                        }
                }

                @Override
                public AllocatedMachine machine() throws IOException {
                        var am = s.withRenewal(() -> {
                                var conn = s.connection(uri, MACHINE);
                                try (var is = checkForError(conn,
                                                "couldn't get allocation description")) {
                                        if (conn.getResponseCode() == HTTP_NO_CONTENT) {
                                                throw new IOException("machine not allocated");
                                        }
                                        return readJson(is, AllocatedMachine.class);
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                        am.setMachine(getMachine(am.getMachineName()));
                        return am;
                }

                @Override
                public boolean getPower() throws IOException {
                        return s.withRenewal(() -> {
                                var conn = s.connection(uri, POWER);
                                try (var is = checkForError(conn, "couldn't get power state")) {
                                        if (conn.getResponseCode() == HTTP_NO_CONTENT) {
                                                throw new IOException("machine not allocated");
                                        }
                                        return "ON".equals(readJson(is, Power.class).power);
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                }

                @Override
                public boolean setPower(boolean switchOn) throws IOException {
                        var power = new Power();
                        power.power = (switchOn ? "ON" : "OFF");
                        boolean powered = s.withRenewal(() -> {
                                var conn = s.connection(uri, POWER, true);
                                conn.setRequestMethod("PUT");
                                writeObject(conn, power);
                                try (var is = checkForError(conn, "couldn't set power state")) {
                                        if (conn.getResponseCode() == HTTP_NO_CONTENT) {
                                                throw new IOException("machine not allocated");
                                        }
                                        return "ON".equals(readJson(is, Power.class).power);
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                        if (!powered) {
                                // If someone turns the power off, close the proxy
                                synchronized (lock) {
                                        if (haveProxy()) {
                                                proxy.close();
                                                proxy = null;
                                        }
                                }
                        }
                        return powered;
                }

                @Override
                public WhereIs whereIs(HasChipLocation chip) throws IOException {
                        return whereis(uri.resolve(
                                        format("chip?x=%d&y=%d", chip.getX(), chip.getY())));
                }

                @GuardedBy("lock")
                private boolean haveProxy() {
                        return nonNull(proxy) && proxy.isOpen();
                }

                /**
                 * @return The websocket-based proxy.
                 * @throws IOException
                 *             if we can't connect
                 * @throws InterruptedException
                 *             if we're interrupted while connecting
                 */
                private ProxyProtocolClient getProxy()
                                throws IOException, InterruptedException {
                        synchronized (lock) {
                                if (haveProxy()) {
                                        return proxy;
                                }
                        }
                        var wssAddr = describe(false).getProxyAddress();
                        if (isNull(wssAddr)) {
                                throw new IOException("machine not allocated");
                        }
                        synchronized (lock) {
                                if (!haveProxy()) {
                                        proxy = s.withRenewal(() -> s.websocket(wssAddr));
                                }
                                return proxy;
                        }
                }

                @MustBeClosed
                @Override
                public TransceiverInterface getTransceiver()
                                throws IOException, InterruptedException, SpinnmanException {
                        var ws = getProxy();
                        return new ProxiedTransceiver(this, ws);
                }

                @Override
                public String toString() {
                        return "Job(" + uri + ")";
                }

                @Override
                public void writeMemory(HasChipLocation chip,
                                MemoryLocation baseAddress, ByteBuffer data)
                                throws IOException {
                        try {
                                s.withRenewal(() -> {
                                        var conn = s.connection(uri,
                                                        new URI(MEMORY + "?x=" + chip.getX()
                                                                        + "&y=" + chip.getY()
                                                                        + "&address="
                                                                        + toUnsignedString(baseAddress.address)),
                                                        true);
                                        conn.setDoOutput(true);
                                        conn.setRequestMethod("POST");
                                        conn.setRequestProperty(
                                                        "Content-Type", "application/octet-stream");
                                        try (var os = conn.getOutputStream();
                                                        var channel = Channels.newChannel(os)) {
                                                channel.write(data);
                                        }
                                        checkForErrorNoResponse(conn, "Couldn't write memory");
                                        return null;
                                });
                        } catch (URISyntaxException e) {
                                throw new IOException(e);
                        }
                }

                @Override
                public ByteBuffer readMemory(HasChipLocation chip,
                                MemoryLocation baseAddress, int length)
                                throws IOException {
                        try {
                                return s.withRenewal(() -> {
                                        var conn = s.connection(uri,
                                                        new URI(MEMORY + "?x=" + chip.getX()
                                                                        + "&y=" + chip.getY()
                                                                        + "&address="
                                                                        + toUnsignedString(baseAddress.address)
                                                                        + "&size=" + length));
                                        conn.setRequestMethod("GET");
                                        conn.setRequestProperty(
                                                        "Accept", "application/octet-stream");
                                        try (var is = checkForError(conn, "couldn't read memory")) {
                                                var buffer = ByteBuffer.allocate(length);
                                                var channel = Channels.newChannel(is);
                                                IOUtils.readFully(channel, buffer);
                                                buffer.rewind();
                                                return buffer.asReadOnlyBuffer().order(LITTLE_ENDIAN);
                                        }
                                });
                        } catch (URISyntaxException e) {
                                throw new IOException(e);
                        }
                }

                @Override
                public void fastWriteData(CoreLocation gathererCore,
                                ChipLocation ethernetChip, String ethernetAddress,
                                IPTag iptag, HasChipLocation chip, MemoryLocation baseAddress,
                                ByteBuffer data) throws IOException {
                        try {
                                s.withRenewal(() -> {
                                        var conn = s.connection(uri,
                                                        new URI(FAST_DATA_WRITE
                                                                        + "?gather_x=" + gathererCore.getX()
                                                                        + "&gather_y=" + gathererCore.getY()
                                                                        + "&gather_p=" + gathererCore.getP()
                                                                        + "&eth_x=" + ethernetChip.getX()
                                                                        + "&eth_y=" + ethernetChip.getY()
                                                                        + "&eth_address=" + ethernetAddress
                                                                        + "&iptag=" + iptag.getTag()
                                                                        + "&x=" + chip.getX()
                                                                        + "&y=" + chip.getY()
                                                                        + "&address="
                                                                        + toUnsignedString(baseAddress.address)),
                                                        true);
                                        conn.setDoOutput(true);
                                        conn.setRequestMethod("POST");
                                        conn.setRequestProperty(
                                                        "Content-Type", "application/octet-stream");
                                        try (var os = conn.getOutputStream();
                                                        var channel = Channels.newChannel(os)) {
                                                channel.write(data);
                                        }
                                        checkForErrorNoResponse(conn, "Couldn't fast write memory");
                                        return null;
                                });
                        } catch (URISyntaxException e) {
                                throw new IOException(e);
                        }
                }
        }

        private static final class MachineImpl extends Common implements Machine {
                private static final int TRIAD = 3;

                private final BriefMachineDescription bmd;

                private List<BoardCoords> deadBoards;

                private List<DeadLink> deadLinks;

                MachineImpl(SpallocClient client, Session session,
                                BriefMachineDescription bmd) {
                        super(client, session);
                        this.bmd = bmd;
                        this.deadBoards = List.copyOf(bmd.deadBoards);
                        this.deadLinks = List.copyOf(bmd.deadLinks);
                }

                @Override
                public String getName() {
                        return bmd.name;
                }

                @Override
                public List<String> getTags() {
                        return bmd.tags;
                }

                @Override
                public int getWidth() {
                        return bmd.width;
                }

                @Override
                public int getHeight() {
                        return bmd.height;
                }

                @Override
                public int getLiveBoardCount() {
                        return bmd.width * bmd.height * TRIAD - bmd.deadBoards.size();
                }

                @Override
                public List<BoardCoords> getDeadBoards() {
                        return deadBoards;
                }

                @Override
                public List<DeadLink> getDeadLinks() {
                        return deadLinks;
                }

                @Override
                public void waitForChange() throws IOException {
                        var nbmd = s.withRenewal(() -> {
                                var conn = s.connection(bmd.uri, WAIT_FLAG);
                                try (var is = checkForError(conn,
                                                "couldn't wait for state change")) {
                                        return readJson(is, BriefMachineDescription.class);
                                } finally {
                                        s.trackCookie(conn);
                                }
                        });
                        this.deadBoards = List.copyOf(nbmd.deadBoards);
                        this.deadLinks = List.copyOf(nbmd.deadLinks);
                }

                @Override
                public WhereIs getBoard(TriadCoords coords) throws IOException {
                        return whereis(
                                        bmd.uri.resolve(format("logical-board?x=%d&y=%d&z=%d",
                                                        coords.x, coords.y, coords.z)));
                }

                @Override
                public WhereIs getBoard(PhysicalCoords coords) throws IOException {
                        return whereis(bmd.uri.resolve(
                                        format("physical-board?cabinet=%d&frame=%d&board=%d",
                                                        coords.c, coords.f, coords.b)));
                }

                @Override
                public WhereIs getBoard(HasChipLocation chip) throws IOException {
                        return whereis(bmd.uri.resolve(
                                        format("chip?x=%d&y=%d", chip.getX(), chip.getY())));
                }

                @Override
                public WhereIs getBoard(String address) throws IOException {
                        return whereis(bmd.uri.resolve(
                                        format("board-ip?address=%s", encode(address, UTF_8))));
                }
        }
}

SpiNNakerManchester / JavaSpiNNaker / 13521016993

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