bundles/org.simantics.acorn/src/org/simantics/acorn/HeadState.java

   1 package org.simantics.acorn;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.IOException;
   5 import java.io.OutputStream;
   6 import java.nio.file.Files;
   7 import java.nio.file.Path;
   8 import java.security.MessageDigest;
   9 import java.security.NoSuchAlgorithmException;
  10 import java.util.ArrayList;
  11 import java.util.Arrays;
  12
  13 import org.simantics.acorn.exception.InvalidHeadStateException;
  14 import org.simantics.databoard.Bindings;
  15 import org.simantics.databoard.adapter.AdapterConstructionException;
  16 import org.simantics.databoard.binding.mutable.MutableVariant;
  17 import org.simantics.databoard.serialization.Serializer;
  18 import org.simantics.databoard.util.binary.BinaryMemory;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 public class HeadState {
  23
  24     private static transient final Logger LOGGER = LoggerFactory.getLogger(HeadState.class);
  25
  26     public static final String HEAD_STATE = "head.state";
  27     public static final String SHA_1 = "SHA-1";
  28
  29     public int headChangeSetId = 0;
  30     public long transactionId = 1;
  31     public long reservedIds = 3;
  32
  33     public ArrayList<String> clusters = new ArrayList<>();
  34     public ArrayList<String> files = new ArrayList<>();
  35     public ArrayList<String> stream = new ArrayList<>();
  36     public ArrayList<String> cs = new ArrayList<>();
  37 //    public ArrayList<String> ccs = new ArrayList<String>();
  38
  39     public long tailChangeSetId = 1;
  40
  41     public static HeadState load(Path directory) throws InvalidHeadStateException {
  42         Path f = directory.resolve(HEAD_STATE);
  43
  44         try {
  45             byte[] bytes = Files.readAllBytes(f);
  46             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
  47             int digestLength = sha1.getDigestLength();
  48             sha1.update(bytes, digestLength, bytes.length - digestLength);
  49             byte[] newChecksum = sha1.digest();
  50             if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) {
  51                 throw new InvalidHeadStateException(
  52                         "Checksum " + Arrays.toString(newChecksum) + " does not match excpected "
  53                                 + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + f.toAbsolutePath());
  54             }
  55             try (ByteArrayInputStream bais = new ByteArrayInputStream(bytes, digestLength, bytes.length - digestLength)) {
  56                 HeadState object = (HeadState) org.simantics.databoard.Files.readFile(bais, Bindings.getBindingUnchecked(HeadState.class));
  57                 return object;
  58             }
  59         } catch (IOException i) {
  60                 Throwable cause = i.getCause();
  61                 if(cause instanceof AdapterConstructionException) {
  62                         HeadState1 old = HeadState1.load(directory);
  63                         return old.migrate();
  64                 }
  65             throw new InvalidHeadStateException(i);
  66         } catch (NoSuchAlgorithmException e) {
  67             throw new Error("SHA-1 Algorithm not found", e);
  68         } catch (Throwable t) {
  69             throw new InvalidHeadStateException(t);
  70         }
  71     }
  72
  73     public void save(Path directory) throws IOException {
  74         Path f = directory.resolve(HEAD_STATE);
  75         try {
  76             BinaryMemory rf = new BinaryMemory(4096);
  77             try {
  78                 MutableVariant v = new MutableVariant(Bindings.getBindingUnchecked(HeadState.class), this);
  79                 Serializer s = Bindings.getSerializerUnchecked( Bindings.VARIANT );
  80                 s.serialize(rf, v);
  81             } finally {
  82                 rf.close();
  83             }
  84
  85             byte[] bytes = rf.toByteBuffer().array();
  86
  87             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
  88             sha1.update(bytes);
  89             byte[] checksum = sha1.digest();
  90
  91             try (OutputStream out = Files.newOutputStream(f)) {
  92                 out.write(checksum);
  93                 out.write(bytes);
  94             }
  95             FileIO.syncPath(f);
  96         } catch (NoSuchAlgorithmException e) {
  97             throw new Error("SHA-1 digest not found, should not happen", e);
  98         }
  99     }
 100
 101     public static boolean validateHeadStateIntegrity(Path headState) {
 102         try {
 103             byte[] bytes = Files.readAllBytes(headState);
 104             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
 105             int digestLength = sha1.getDigestLength();
 106             sha1.update(bytes, digestLength, bytes.length - digestLength);
 107             byte[] newChecksum = sha1.digest();
 108             if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) {
 109                 LOGGER.error("Checksum " + Arrays.toString(newChecksum) + " does not match excpected " + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + headState.toAbsolutePath());
 110                 return false;
 111             }
 112             return true;
 113         } catch (IOException e) {
 114             LOGGER.error("An I/O error occured while validating integrity of head.state", e);
 115             return false;
 116         } catch (NoSuchAlgorithmException e) {
 117             LOGGER.error("SHA-1 digest not found, should not happen", e);
 118             throw new Error("SHA-1 digest not found, should not happen", e);
 119         }
 120     }
 121
 122 }