org.simantics.maps.server/src/org/simantics/district/maps/server/TileserverMapnik.java

   1 package org.simantics.district.maps.server;
   2
   3 import java.io.ByteArrayOutputStream;
   4 import java.io.IOException;
   5 import java.io.InputStream;
   6 import java.nio.charset.StandardCharsets;
   7 import java.nio.file.DirectoryStream;
   8 import java.nio.file.Files;
   9 import java.nio.file.Path;
  10 import java.nio.file.StandardOpenOption;
  11 import java.util.ArrayList;
  12 import java.util.HashMap;
  13 import java.util.List;
  14 import java.util.Map;
  15 import java.util.concurrent.TimeUnit;
  16 import java.util.concurrent.atomic.AtomicBoolean;
  17 import java.util.stream.Stream;
  18
  19 import org.simantics.district.maps.server.prefs.MapsServerPreferences;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22 import org.yaml.snakeyaml.Yaml;
  23 import org.zeroturnaround.exec.ProcessExecutor;
  24 import org.zeroturnaround.exec.StartedProcess;
  25 import org.zeroturnaround.exec.stream.slf4j.Slf4jStream;
  26 import org.zeroturnaround.process.PidProcess;
  27 import org.zeroturnaround.process.PidUtil;
  28 import org.zeroturnaround.process.Processes;
  29 import org.zeroturnaround.process.SystemProcess;
  30
  31 import com.fasterxml.jackson.core.JsonParseException;
  32 import com.fasterxml.jackson.databind.JsonMappingException;
  33 import com.fasterxml.jackson.databind.ObjectMapper;
  34
  35 public class TileserverMapnik {
  36
  37     private static final Logger LOGGER = LoggerFactory.getLogger(TileserverMapnik.class);
  38     private static final String[] ADDITIONAL_DEPENDENCIES = new String[] { "tilelive-vector@3.9.4", "tilelive-tmstyle@0.6.0" };
  39
  40     private SystemProcess process;
  41     private Path serverRoot;
  42
  43     private AtomicBoolean running = new AtomicBoolean(false);
  44
  45     TileserverMapnik(Path serverRoot) {
  46         this.serverRoot = serverRoot.normalize();
  47     }
  48
  49     public boolean isRunning() throws IOException, InterruptedException {
  50         return process == null ? false : process.isAlive() && isReady();
  51     }
  52
  53     public boolean isReady() {
  54         return running.get();
  55     }
  56
  57     public void start() throws Exception {
  58         // check if existing server is left hanging
  59         if (Files.exists(getPid())) {
  60             String pid = new String(Files.readAllBytes(getPid()));
  61             PidProcess pr = Processes.newPidProcess(Integer.parseInt(pid));
  62             pr.destroyForcefully();
  63         }
  64
  65         // check that npm dependencies are satisfied
  66         if (checkAndInstall(null)) {
  67             checkAndInstall(ADDITIONAL_DEPENDENCIES[0]);
  68             checkAndInstall(ADDITIONAL_DEPENDENCIES[1]);
  69         }
  70
  71         checkConfigJson();
  72         checkTm2Styles();
  73
  74         if (process != null && process.isAlive())
  75             return;
  76
  77         StartedProcess startedProcess = new ProcessExecutor().directory(serverRoot.resolve("tileserver-mapnik").toFile()).destroyOnExit().environment(getEnv())
  78                 .command(NodeJS.executable().toString(), getTessera().toString(), "-c", getConfigJson().toString(), "-p", Integer.toString(MapsServerPreferences.defaultPort()))
  79                 .redirectOutput(Slf4jStream.ofCaller().asDebug()).start();
  80
  81         Process nativeProcess = startedProcess.getProcess();
  82         process = Processes.newStandardProcess(nativeProcess);
  83         int pid = PidUtil.getPid(nativeProcess);
  84         Files.write(getPid(), (pid + "").getBytes(), StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
  85         running.set(true);
  86     }
  87
  88     private Map<String, String> getEnv() {
  89         Map<String, String> env = new HashMap<>();
  90         env.put("MAPNIK_FONT_PATH", getFonts().toString());
  91         env.put("ICU_DATA", getICU().toString());
  92         return env;
  93     }
  94
  95     public void stop() throws IOException, InterruptedException {
  96         if (process != null && process.isAlive()) {
  97             // gracefully not supported on windows
  98             process.destroyForcefully();
  99             if (!process.waitFor(2000, TimeUnit.MILLISECONDS)) {
 100                 process.destroyForcefully();
 101                 if (process.isAlive())
 102                     LOGGER.error("Could not shutdown TileserverMapnik!");
 103             }
 104             process = null;
 105             Files.delete(getPid());
 106             running.set(false);
 107         }
 108     }
 109
 110     private Path getPid() {
 111         return serverRoot.resolve("pid");
 112     }
 113
 114     public void restart() throws Exception {
 115         stop();
 116         start();
 117     }
 118
 119     private boolean checkIfInstalled(String module) throws Exception {
 120         String tileserverMapnik = tileserverMapnikRoot().toString();
 121         int retVal;
 122         try (ByteArrayOutputStream output = new ByteArrayOutputStream()) {
 123             if (module == null) {
 124                 retVal = NodeJS.npm(output, "--prefix", tileserverMapnik, "list");
 125             } else {
 126                 retVal = NodeJS.npm(output, "--prefix", tileserverMapnik, "list", module);
 127             }
 128             String outputString = new String(output.toByteArray(), StandardCharsets.UTF_8);
 129         }
 130         return retVal == 0;
 131     }
 132
 133     private boolean install(String module) throws Exception {
 134         String tileserverMapnik = tileserverMapnikRoot().toString();
 135         int retVal;
 136         if (module == null)
 137             retVal = NodeJS.npm(null, "--prefix", tileserverMapnik, "install", "--save");
 138         else
 139             retVal = NodeJS.npm(null, "--prefix", tileserverMapnik, "install", module, "--save");
 140         if (retVal != 0)
 141             LOGGER.warn("Could not install module " + module == null ? "package.json" : module + "! " + retVal);
 142         return retVal == 0;
 143     }
 144
 145     private boolean checkAndInstall(String module) throws Exception {
 146         boolean installed = checkIfInstalled(module);
 147         if (!installed)
 148             install(module);
 149         return !installed;
 150     }
 151
 152
 153     private Path tileserverMapnikRoot() {
 154         return serverRoot.resolve("tileserver-mapnik").toAbsolutePath();
 155     }
 156
 157     private Path getFonts() {
 158         return serverRoot.resolve("fonts").toAbsolutePath();
 159     }
 160
 161     private Path getICU() {
 162         return serverRoot.resolve("tileserver-mapnik/node_modules/tilelive-vector/node_modules/mapnik/lib/binding/node-v46-win32-x64/share/icu").toAbsolutePath();
 163     }
 164
 165     private Path getTessera() {
 166         return serverRoot.resolve("tileserver-mapnik/bin/tessera.js").toAbsolutePath();
 167     }
 168
 169     private Path getConfigJson() {
 170         return serverRoot.resolve("config.json").toAbsolutePath();
 171     }
 172
 173     public List<String> availableMBTiles() throws IOException {
 174         Path data = getDataDirectory();
 175         List<String> result = new ArrayList<>();
 176         try (Stream<Path> paths = Files.walk(data)) {
 177             paths.forEach(p -> {
 178                 if (!p.equals(data)) {
 179                     String tiles = p.getFileName().toString();
 180                     result.add(tiles);
 181                 }
 182             });
 183         }
 184         return result;
 185     }
 186
 187     private void checkConfigJson() throws JsonParseException, JsonMappingException, IOException {
 188         Path configJson = getConfigJson();
 189         Map<String, Object> config = new HashMap<>();
 190         Path tm2 = getStyleDirectory();
 191         try (DirectoryStream<Path> stream = Files.newDirectoryStream(tm2)) {
 192             stream.forEach(p -> {
 193                 Path projectYaml = p.resolve("project.yml");
 194                 if (Files.exists(projectYaml)) {
 195                     // Good
 196
 197                     Map<String, String> source = new HashMap<>();
 198
 199                     Path tm2style = serverRoot.relativize(projectYaml.getParent());
 200
 201                     String prefix = "tmstyle://../";
 202                     String tmStyle = prefix + tm2style.toString();
 203                     source.put("source", tmStyle);
 204                     config.put("/" + projectYaml.getParent().getFileName().toString(), source);
 205                 }
 206             });
 207         }
 208         ObjectMapper mapper = new ObjectMapper();
 209         mapper.writerWithDefaultPrettyPrinter().writeValue(Files.newOutputStream(configJson, StandardOpenOption.TRUNCATE_EXISTING), config);
 210     }
 211
 212     public Path getStyleDirectory() {
 213         return serverRoot.resolve("tm2");
 214     }
 215
 216     public Path getDataDirectory() {
 217         return serverRoot.resolve("data");
 218     }
 219
 220     public Path getCurrentTiles() {
 221         return getDataDirectory().resolve(MapsServerPreferences.currentMBTiles());
 222     }
 223
 224     public void checkTm2Styles() {
 225         Path tm2 = getStyleDirectory();
 226         try (DirectoryStream<Path> stream = Files.newDirectoryStream(tm2)) {
 227             stream.forEach(p -> {
 228                 Path projectYaml = p.resolve("project.yml");
 229                 Yaml yaml = new Yaml();
 230                 Map<String, String> data = null;
 231                 try (InputStream input = Files.newInputStream(projectYaml, StandardOpenOption.READ)) {
 232                     data = yaml.loadAs(input, Map.class);
 233
 234                     Path tiles = serverRoot.relativize(getCurrentTiles());
 235
 236                     String tmStyle = "mbtiles://../" + tiles.toString();
 237                     data.put("source", tmStyle);
 238
 239                 } catch (IOException e) {
 240                     LOGGER.error("Could not read yaml", e);
 241                 }
 242                 try {
 243                     Files.write(projectYaml, yaml.dump(data).getBytes(), StandardOpenOption.TRUNCATE_EXISTING);
 244                 } catch (IOException e) {
 245                     LOGGER.error("Could not write yaml", e);
 246                 }
 247             });
 248         } catch (IOException e) {
 249             LOGGER.error("Could not browse tm2 styles", e);
 250         }
 251     }
 252
 253     public List<String> listStyles() throws IOException {
 254         List<String> results = new ArrayList<>();
 255         Path tm2 = getStyleDirectory();
 256         try (DirectoryStream<Path> stream = Files.newDirectoryStream(tm2)) {
 257             stream.forEach(p -> {
 258                 results.add(p.getFileName().toString());
 259             });
 260         }
 261         return results;
 262     }
 263
 264 }