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
  20 public class HeadState {
  21
  22     public static final String HEAD_STATE = "head.state";
  23     public static final String SHA_1 = "SHA-1";
  24
  25     public int headChangeSetId = 0;
  26     public long transactionId = 1;
  27     public long reservedIds = 3;
  28
  29     public ArrayList<String> clusters = new ArrayList<>();
  30     public ArrayList<String> files = new ArrayList<>();
  31     public ArrayList<String> stream = new ArrayList<>();
  32     public ArrayList<String> cs = new ArrayList<>();
  33 //    public ArrayList<String> ccs = new ArrayList<String>();
  34
  35     public long tailChangeSetId = 1;
  36
  37     public static HeadState load(Path directory) throws InvalidHeadStateException {
  38         Path f = directory.resolve(HEAD_STATE);
  39
  40         try {
  41             byte[] bytes = Files.readAllBytes(f);
  42             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
  43             int digestLength = sha1.getDigestLength();
  44
  45             sha1.update(bytes, digestLength, bytes.length - digestLength);
  46             byte[] newChecksum = sha1.digest();
  47             if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) {
  48                 throw new InvalidHeadStateException(
  49                         "Checksum " + Arrays.toString(newChecksum) + " does not match excpected "
  50                                 + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + f.toAbsolutePath());
  51             }
  52             try (ByteArrayInputStream bais = new ByteArrayInputStream(bytes, digestLength, bytes.length - digestLength)) {
  53                 HeadState object = (HeadState) org.simantics.databoard.Files.readFile(bais, Bindings.getBindingUnchecked(HeadState.class));
  54                 return object;
  55             }
  56         } catch (IOException i) {
  57                 Throwable cause = i.getCause();
  58                 if(cause instanceof AdapterConstructionException) {
  59                         HeadState1 old = HeadState1.load(directory);
  60                         return old.migrate();
  61                 }
  62             return new HeadState();
  63 //            throw new InvalidHeadStateException(i);
  64         } catch (NoSuchAlgorithmException e) {
  65             throw new Error("SHA-1 Algorithm not found", e);
  66         } catch (Throwable t) {
  67             throw new InvalidHeadStateException(t);
  68         }
  69     }
  70
  71     public void save(Path directory) throws IOException {
  72         Path f = directory.resolve(HEAD_STATE);
  73         try {
  74             BinaryMemory rf = new BinaryMemory(4096);
  75             try {
  76                 MutableVariant v = new MutableVariant(Bindings.getBindingUnchecked(HeadState.class), this);
  77                 Serializer s = Bindings.getSerializerUnchecked( Bindings.VARIANT );
  78                 s.serialize(rf, v);
  79             } finally {
  80                 rf.close();
  81             }
  82
  83             byte[] bytes = rf.toByteBuffer().array();
  84
  85             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
  86             sha1.update(bytes);
  87             byte[] checksum = sha1.digest();
  88
  89             try (OutputStream out = Files.newOutputStream(f)) {
  90                 out.write(checksum);
  91                 out.write(bytes);
  92             }
  93             FileIO.syncPath(f);
  94         } catch (NoSuchAlgorithmException e) {
  95             throw new Error("SHA-1 digest not found, should not happen", e);
  96         }
  97     }
  98
  99     public static void validateHeadStateIntegrity(Path headState) throws InvalidHeadStateException, IOException {
 100         try {
 101             byte[] bytes = Files.readAllBytes(headState);
 102             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
 103             int digestLength = sha1.getDigestLength();
 104             sha1.update(bytes, digestLength, bytes.length - digestLength);
 105             byte[] newChecksum = sha1.digest();
 106             if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) {
 107                 throw new InvalidHeadStateException(
 108                         "Checksum " + Arrays.toString(newChecksum) + " does not match excpected "
 109                                 + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + headState.toAbsolutePath());
 110             }
 111         } catch (NoSuchAlgorithmException e) {
 112             throw new Error("SHA-1 digest not found, should not happen", e);
 113         }
 114     }
 115 }