app/src/main/java/net/ktnx/mobileledger/async/RetrieveTransactionsTask.java

   1 /*
   2  * Copyright © 2018 Damyan Ivanov.
   3  * This file is part of Mobile-Ledger.
   4  * Mobile-Ledger is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * Mobile-Ledger is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.async;
  19
  20 import android.annotation.SuppressLint;
  21 import android.content.SharedPreferences;
  22 import android.database.sqlite.SQLiteDatabase;
  23 import android.os.AsyncTask;
  24 import android.util.Log;
  25
  26 import net.ktnx.mobileledger.R;
  27 import net.ktnx.mobileledger.TransactionListActivity;
  28 import net.ktnx.mobileledger.model.LedgerTransaction;
  29 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  30 import net.ktnx.mobileledger.utils.MLDB;
  31 import net.ktnx.mobileledger.utils.NetworkUtil;
  32
  33 import java.io.BufferedReader;
  34 import java.io.FileNotFoundException;
  35 import java.io.IOException;
  36 import java.io.InputStream;
  37 import java.io.InputStreamReader;
  38 import java.lang.ref.WeakReference;
  39 import java.net.HttpURLConnection;
  40 import java.net.MalformedURLException;
  41 import java.util.Date;
  42 import java.util.regex.Matcher;
  43 import java.util.regex.Pattern;
  44
  45
  46 public class RetrieveTransactionsTask extends
  47         AsyncTask<RetrieveTransactionsTask.Params, RetrieveTransactionsTask.Progress, Void> {
  48     private static final Pattern transactionStartPattern = Pattern.compile("<tr class=\"title\" " +
  49                                                                            "id=\"transaction-(\\d+)\"><td class=\"date\"[^\\\"]*>([\\d.-]+)</td>");
  50     private static final Pattern transactionDescriptionPattern =
  51             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  52     private static final Pattern transactionDetailsPattern =
  53             Pattern.compile("^\\s+" + "(\\S[\\S\\s]+\\S)\\s\\s+([-+]?\\d[\\d,.]*)");
  54     private static final Pattern endPattern = Pattern.compile("\\bid=\"addmodal\"");
  55     protected WeakReference<TransactionListActivity> contextRef;
  56     protected int error;
  57     private boolean success;
  58     public RetrieveTransactionsTask(WeakReference<TransactionListActivity> contextRef) {
  59         this.contextRef = contextRef;
  60     }
  61     private static final void L(String msg) {
  62 //        Log.d("transaction-parser", msg);
  63     }
  64     @Override
  65     protected void onProgressUpdate(Progress... values) {
  66         super.onProgressUpdate(values);
  67         TransactionListActivity context = getContext();
  68         if (context == null) return;
  69         context.onRetrieveProgress(values[0]);
  70     }
  71     @Override
  72     protected void onPreExecute() {
  73         super.onPreExecute();
  74         TransactionListActivity context = getContext();
  75         if (context == null) return;
  76         context.onRetrieveStart();
  77     }
  78     @Override
  79     protected void onPostExecute(Void aVoid) {
  80         super.onPostExecute(aVoid);
  81         TransactionListActivity context = getContext();
  82         if (context == null) return;
  83         context.onRetrieveDone(success);
  84     }
  85     @SuppressLint("DefaultLocale")
  86     @Override
  87     protected Void doInBackground(Params... params) {
  88         Progress progress = new Progress();
  89         int maxTransactionId = Progress.INDETERMINATE;
  90         success = false;
  91         try {
  92             HttpURLConnection http =
  93                     NetworkUtil.prepare_connection(params[0].getBackendPref(), "journal");
  94             http.setAllowUserInteraction(false);
  95             publishProgress(progress);
  96             TransactionListActivity ctx = contextRef.get();
  97             if (ctx == null) return null;
  98             try (SQLiteDatabase db = MLDB.getWritableDatabase(ctx)) {
  99                 try (InputStream resp = http.getInputStream()) {
 100                     if (http.getResponseCode() != 200) throw new IOException(
 101                             String.format("HTTP error %d", http.getResponseCode()));
 102                     db.beginTransaction();
 103                     try {
 104                         db.execSQL("UPDATE transactions set keep=0");
 105
 106                         int state = ParserState.EXPECTING_JOURNAL;
 107                         String line;
 108                         BufferedReader buf =
 109                                 new BufferedReader(new InputStreamReader(resp, "UTF-8"));
 110
 111                         int processedTransactionCount = 0;
 112                         int transactionId = 0;
 113                         int matchedTransactionsCount = 0;
 114                         LedgerTransaction transaction = null;
 115                         LINES:
 116                         while ((line = buf.readLine()) != null) {
 117                             if (isCancelled()) break;
 118                             Matcher m;
 119                             //L(String.format("State is %d", state));
 120                             switch (state) {
 121                                 case ParserState.EXPECTING_JOURNAL:
 122                                     if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 123                                     if (line.equals("<h2>General Journal</h2>")) {
 124                                         state = ParserState.EXPECTING_TRANSACTION;
 125                                         L("→ expecting transaction");
 126                                     }
 127                                     break;
 128                                 case ParserState.EXPECTING_TRANSACTION:
 129                                     if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 130                                     m = transactionStartPattern.matcher(line);
 131                                     if (m.find()) {
 132                                         transactionId = Integer.valueOf(m.group(1));
 133                                         state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 134                                         L(String.format(
 135                                                 "found transaction %d → expecting " + "description",
 136                                                 transactionId));
 137                                         progress.setProgress(++processedTransactionCount);
 138                                         if (maxTransactionId < transactionId)
 139                                             maxTransactionId = transactionId;
 140                                         if ((progress.getTotal() == Progress.INDETERMINATE) ||
 141                                             (progress.getTotal() < transactionId))
 142                                             progress.setTotal(transactionId);
 143                                         publishProgress(progress);
 144                                     }
 145                                     m = endPattern.matcher(line);
 146                                     if (m.find()) {
 147                                         L("--- transaction list complete ---");
 148                                         success = true;
 149                                         break LINES;
 150                                     }
 151                                     break;
 152                                 case ParserState.EXPECTING_TRANSACTION_DESCRIPTION:
 153                                     if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 154                                     m = transactionDescriptionPattern.matcher(line);
 155                                     if (m.find()) {
 156                                         if (transactionId == 0)
 157                                             throw new TransactionParserException(
 158                                                     "Transaction Id is 0 while expecting " +
 159                                                     "description");
 160
 161                                         transaction =
 162                                                 new LedgerTransaction(transactionId, m.group(1),
 163                                                         m.group(2));
 164                                         state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 165                                         L(String.format("transaction %d created for %s (%s) →" +
 166                                                         " expecting details", transactionId,
 167                                                 m.group(1), m.group(2)));
 168                                     }
 169                                     break;
 170                                 case ParserState.EXPECTING_TRANSACTION_DETAILS:
 171                                     if (line.isEmpty()) {
 172                                         // transaction data collected
 173                                         if (transaction.existsInDb(db)) {
 174                                             db.execSQL("UPDATE transactions SET keep = 1 WHERE id" +
 175                                                        "=?", new Integer[]{transaction.getId()});
 176                                             matchedTransactionsCount++;
 177
 178                                             if (matchedTransactionsCount == 100) {
 179                                                 db.execSQL("UPDATE transactions SET keep=1 WHERE " +
 180                                                            "id < ?",
 181                                                         new Integer[]{transaction.getId()});
 182                                                 success = true;
 183                                                 progress.setTotal(progress.getProgress());
 184                                                 publishProgress(progress);
 185                                                 break LINES;
 186                                             }
 187                                         }
 188                                         else {
 189                                             db.execSQL("DELETE from transactions WHERE id=?",
 190                                                     new Integer[]{transaction.getId()});
 191                                             db.execSQL("DELETE from transaction_accounts WHERE " +
 192                                                        "transaction_id=?",
 193                                                     new Integer[]{transaction.getId()});
 194                                             transaction.insertInto(db);
 195                                             matchedTransactionsCount = 0;
 196                                             progress.setTotal(maxTransactionId);
 197                                         }
 198
 199                                         state = ParserState.EXPECTING_TRANSACTION;
 200                                         L(String.format(
 201                                                 "transaction %s saved → expecting " + "transaction",
 202                                                 transaction.getId()));
 203
 204 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 205 // for example, when you add the initial seeding transaction after entering some others
 206 //                                            if (transactionId == 1) {
 207 //                                                L("This was the initial transaction. Terminating " +
 208 //                                                  "parser");
 209 //                                                break LINES;
 210 //                                            }
 211                                     }
 212                                     else {
 213                                         m = transactionDetailsPattern.matcher(line);
 214                                         if (m.find()) {
 215                                             String acc_name = m.group(1);
 216                                             String amount = m.group(2);
 217                                             amount = amount.replace(',', '.');
 218                                             transaction.addAccount(
 219                                                     new LedgerTransactionAccount(acc_name,
 220                                                             Float.valueOf(amount)));
 221                                             L(String.format("%s = %s", acc_name, amount));
 222                                         }
 223                                         else throw new IllegalStateException(
 224                                                 String.format("Can't parse transaction %d details",
 225                                                         transactionId));
 226                                     }
 227                                     break;
 228                                 default:
 229                                     throw new RuntimeException(
 230                                             String.format("Unknown parser state %d", state));
 231                             }
 232                         }
 233                         if (!isCancelled()) {
 234                             db.execSQL("DELETE FROM transactions WHERE keep = 0");
 235                             db.setTransactionSuccessful();
 236                         }
 237                     }
 238                     finally {
 239                         db.endTransaction();
 240                     }
 241                 }
 242             }
 243
 244             if (success && !isCancelled()) {
 245                 Log.d("db", "Updating transaction list stamp");
 246                 MLDB.set_option_value(ctx, MLDB.OPT_TRANSACTION_LIST_STAMP, new Date().getTime());
 247                 ctx.model.reloadTransactions(ctx);
 248             }
 249         }
 250         catch (MalformedURLException e) {
 251             error = R.string.err_bad_backend_url;
 252             e.printStackTrace();
 253         }
 254         catch (FileNotFoundException e) {
 255             error = R.string.err_bad_auth;
 256             e.printStackTrace();
 257         }
 258         catch (IOException e) {
 259             error = R.string.err_net_io_error;
 260             e.printStackTrace();
 261         }
 262         return null;
 263     }
 264     TransactionListActivity getContext() {
 265         return contextRef.get();
 266     }
 267
 268     public static class Params {
 269         private SharedPreferences backendPref;
 270
 271         public Params(SharedPreferences backendPref) {
 272             this.backendPref = backendPref;
 273         }
 274         SharedPreferences getBackendPref() {
 275             return backendPref;
 276         }
 277     }
 278
 279     public class Progress {
 280         public static final int INDETERMINATE = -1;
 281         private int progress;
 282         private int total;
 283         Progress() {
 284             this(INDETERMINATE, INDETERMINATE);
 285         }
 286         Progress(int progress, int total) {
 287             this.progress = progress;
 288             this.total = total;
 289         }
 290         public int getProgress() {
 291             return progress;
 292         }
 293         protected void setProgress(int progress) {
 294             this.progress = progress;
 295         }
 296         public int getTotal() {
 297             return total;
 298         }
 299         protected void setTotal(int total) {
 300             this.total = total;
 301         }
 302     }
 303
 304     private class TransactionParserException extends IllegalStateException {
 305         TransactionParserException(String message) {
 306             super(message);
 307         }
 308     }
 309
 310     private class ParserState {
 311         static final int EXPECTING_JOURNAL = 0;
 312         static final int EXPECTING_TRANSACTION = 1;
 313         static final int EXPECTING_TRANSACTION_DESCRIPTION = 2;
 314         static final int EXPECTING_TRANSACTION_DETAILS = 3;
 315     }
 316 }