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.binding.mutable.MutableVariant;
  16 import org.simantics.databoard.serialization.Serializer;
  17 import org.simantics.databoard.util.binary.BinaryMemory;
  18
  19 public class HeadState {
  20
  21     public static final String HEAD_STATE = "head.state";
  22     public static final String SHA_1 = "SHA-1";
  23
  24     public int headChangeSetId = 0;
  25     public long transactionId = 1;
  26     public long reservedIds = 3;
  27
  28     public ArrayList<String> clusters = new ArrayList<>();
  29     public ArrayList<String> files = new ArrayList<>();
  30     public ArrayList<String> stream = new ArrayList<>();
  31     public ArrayList<String> cs = new ArrayList<>();
  32 //    public ArrayList<String> ccs = new ArrayList<String>();
  33
  34     public static HeadState load(Path directory) throws InvalidHeadStateException {
  35         Path f = directory.resolve(HEAD_STATE);
  36
  37         try {
  38             byte[] bytes = Files.readAllBytes(f);
  39             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
  40             int digestLength = sha1.getDigestLength();
  41
  42             sha1.update(bytes, digestLength, bytes.length - digestLength);
  43             byte[] newChecksum = sha1.digest();
  44             if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) {
  45                 throw new InvalidHeadStateException(
  46                         "Checksum " + Arrays.toString(newChecksum) + " does not match excpected "
  47                                 + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + f.toAbsolutePath());
  48             }
  49             try (ByteArrayInputStream bais = new ByteArrayInputStream(bytes, digestLength, bytes.length - digestLength)) {
  50                 HeadState object = (HeadState) org.simantics.databoard.Files.readFile(bais, Bindings.getBindingUnchecked(HeadState.class));
  51                 return object;
  52             }
  53         } catch (IOException i) {
  54             return new HeadState();
  55 //            throw new InvalidHeadStateException(i);
  56         } catch (NoSuchAlgorithmException e) {
  57             throw new Error("SHA-1 Algorithm not found", e);
  58         } catch (Throwable t) {
  59             throw new InvalidHeadStateException(t);
  60         }
  61     }
  62
  63     public void save(Path directory) throws IOException {
  64         Path f = directory.resolve(HEAD_STATE);
  65         try {
  66             BinaryMemory rf = new BinaryMemory(4096);
  67             try {
  68                 MutableVariant v = new MutableVariant(Bindings.getBindingUnchecked(HeadState.class), this);
  69                 Serializer s = Bindings.getSerializerUnchecked( Bindings.VARIANT );
  70                 s.serialize(rf, v);
  71             } finally {
  72                 rf.close();
  73             }
  74
  75             byte[] bytes = rf.toByteBuffer().array();
  76
  77             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
  78             sha1.update(bytes);
  79             byte[] checksum = sha1.digest();
  80
  81             try (OutputStream out = Files.newOutputStream(f)) {
  82                 out.write(checksum);
  83                 out.write(bytes);
  84             }
  85             FileIO.syncPath(f);
  86         } catch (NoSuchAlgorithmException e) {
  87             throw new Error("SHA-1 digest not found, should not happen", e);
  88         }
  89     }
  90
  91     public static void validateHeadStateIntegrity(Path headState) throws InvalidHeadStateException, IOException {
  92         try {
  93             byte[] bytes = Files.readAllBytes(headState);
  94             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);
  95             int digestLength = sha1.getDigestLength();
  96             sha1.update(bytes, digestLength, bytes.length - digestLength);
  97             byte[] newChecksum = sha1.digest();
  98             if (!Arrays.equals(newChecksum, Arrays.copyOfRange(bytes, 0, digestLength))) {
  99                 throw new InvalidHeadStateException(
 100                         "Checksum " + Arrays.toString(newChecksum) + " does not match excpected "
 101                                 + Arrays.toString(Arrays.copyOfRange(bytes, 0, digestLength)) + " for " + headState.toAbsolutePath());
 102             }
 103         } catch (NoSuchAlgorithmException e) {
 104             throw new Error("SHA-1 digest not found, should not happen", e);
 105         }
 106     }
 107 }