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

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe 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  * MoLe 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 MoLe. 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.database.sqlite.SQLiteDatabase;
  22 import android.os.AsyncTask;
  23 import android.os.OperationCanceledException;
  24 import android.util.Log;
  25
  26 import net.ktnx.mobileledger.model.Data;
  27 import net.ktnx.mobileledger.model.LedgerAccount;
  28 import net.ktnx.mobileledger.model.LedgerTransaction;
  29 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  30 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  31 import net.ktnx.mobileledger.ui.activity.MainActivity;
  32 import net.ktnx.mobileledger.ui.transaction_list.TransactionListViewModel;
  33 import net.ktnx.mobileledger.utils.MLDB;
  34 import net.ktnx.mobileledger.utils.NetworkUtil;
  35
  36 import java.io.BufferedReader;
  37 import java.io.FileNotFoundException;
  38 import java.io.IOException;
  39 import java.io.InputStream;
  40 import java.io.InputStreamReader;
  41 import java.lang.ref.WeakReference;
  42 import java.net.HttpURLConnection;
  43 import java.net.MalformedURLException;
  44 import java.net.URLDecoder;
  45 import java.nio.charset.StandardCharsets;
  46 import java.text.ParseException;
  47 import java.util.ArrayList;
  48 import java.util.Date;
  49 import java.util.HashMap;
  50 import java.util.Stack;
  51 import java.util.regex.Matcher;
  52 import java.util.regex.Pattern;
  53
  54
  55 public class RetrieveTransactionsTask
  56         extends AsyncTask<Void, RetrieveTransactionsTask.Progress, String> {
  57     private static final int MATCHING_TRANSACTIONS_LIMIT = 50;
  58     private static final Pattern reComment = Pattern.compile("^\\s*;");
  59     private static final Pattern reTransactionStart = Pattern.compile("<tr class=\"title\" " +
  60                                                                       "id=\"transaction-(\\d+)\"><td class=\"date\"[^\"]*>([\\d.-]+)</td>");
  61     private static final Pattern reTransactionDescription =
  62             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  63     private static final Pattern reTransactionDetails =
  64             Pattern.compile("^\\s+(\\S[\\S\\s]+\\S)\\s\\s+([-+]?\\d[\\d,.]*)(?:\\s+(\\S+)$)?");
  65     private static final Pattern reEnd = Pattern.compile("\\bid=\"addmodal\"");
  66     private WeakReference<MainActivity> contextRef;
  67     private int error;
  68     // %3A is '='
  69     private Pattern reAccountName = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  70     private Pattern reAccountValue = Pattern.compile(
  71             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  72     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef) {
  73         this.contextRef = contextRef;
  74     }
  75     private static void L(String msg) {
  76         //Log.d("transaction-parser", msg);
  77     }
  78     @Override
  79     protected void onProgressUpdate(Progress... values) {
  80         super.onProgressUpdate(values);
  81         MainActivity context = getContext();
  82         if (context == null) return;
  83         context.onRetrieveProgress(values[0]);
  84     }
  85     @Override
  86     protected void onPreExecute() {
  87         super.onPreExecute();
  88         MainActivity context = getContext();
  89         if (context == null) return;
  90         context.onRetrieveStart();
  91     }
  92     @Override
  93     protected void onPostExecute(String error) {
  94         super.onPostExecute(error);
  95         MainActivity context = getContext();
  96         if (context == null) return;
  97         context.onRetrieveDone(error);
  98     }
  99     @Override
 100     protected void onCancelled() {
 101         super.onCancelled();
 102         MainActivity context = getContext();
 103         if (context == null) return;
 104         context.onRetrieveDone(null);
 105     }
 106     @SuppressLint("DefaultLocale")
 107     @Override
 108     protected String doInBackground(Void... params) {
 109         MobileLedgerProfile profile = Data.profile.get();
 110         Progress progress = new Progress();
 111         int maxTransactionId = Progress.INDETERMINATE;
 112         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 113         HashMap<String, Void> accountNames = new HashMap<>();
 114         LedgerAccount lastAccount = null;
 115         boolean onlyStarred = Data.optShowOnlyStarred.get();
 116         Data.backgroundTaskCount.incrementAndGet();
 117         try {
 118             HttpURLConnection http = NetworkUtil.prepareConnection("journal");
 119             http.setAllowUserInteraction(false);
 120             publishProgress(progress);
 121             MainActivity ctx = getContext();
 122             if (ctx == null) return null;
 123             try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 124                 try (InputStream resp = http.getInputStream()) {
 125                     if (http.getResponseCode() != 200) throw new IOException(
 126                             String.format("HTTP error %d", http.getResponseCode()));
 127                     db.beginTransaction();
 128                     try {
 129                         db.execSQL("UPDATE transactions set keep=0");
 130                         db.execSQL("update account_values set keep=0;");
 131                         db.execSQL("update accounts set keep=0;");
 132
 133                         ParserState state = ParserState.EXPECTING_ACCOUNT;
 134                         String line;
 135                         BufferedReader buf = new BufferedReader(
 136                                 new InputStreamReader(resp, StandardCharsets.UTF_8));
 137
 138                         int processedTransactionCount = 0;
 139                         int transactionId = 0;
 140                         int matchedTransactionsCount = 0;
 141                         LedgerTransaction transaction = null;
 142                         LINES:
 143                         while ((line = buf.readLine()) != null) {
 144                             throwIfCancelled();
 145                             Matcher m;
 146                             m = reComment.matcher(line);
 147                             if (m.find()) {
 148                                 // TODO: comments are ignored for now
 149                                 Log.v("transaction-parser", "Ignoring comment");
 150                                 continue;
 151                             }
 152                             //L(String.format("State is %d", updating));
 153                             switch (state) {
 154                                 case EXPECTING_ACCOUNT:
 155                                     if (line.equals("<h2>General Journal</h2>")) {
 156                                         state = ParserState.EXPECTING_TRANSACTION;
 157                                         L("→ expecting transaction");
 158                                         Data.accounts.set(accountList);
 159                                         continue;
 160                                     }
 161                                     m = reAccountName.matcher(line);
 162                                     if (m.find()) {
 163                                         String acct_encoded = m.group(1);
 164                                         String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 165                                         acct_name = acct_name.replace("\"", "");
 166                                         L(String.format("found account: %s", acct_name));
 167
 168                                         lastAccount = profile.loadAccount(acct_name);
 169                                         if (lastAccount == null) {
 170                                             lastAccount = new LedgerAccount(acct_name);
 171                                             profile.storeAccount(lastAccount);
 172                                         }
 173
 174                                         // make sure the parent account(s) are present,
 175                                         // synthesising them if necessary
 176                                         String parentName = lastAccount.getParentName();
 177                                         if (parentName != null) {
 178                                             Stack<String> toAppend = new Stack<>();
 179                                             while (parentName != null) {
 180                                                 if (accountNames.containsKey(parentName)) break;
 181                                                 toAppend.push(parentName);
 182                                                 parentName = new LedgerAccount(parentName)
 183                                                         .getParentName();
 184                                             }
 185                                             while (!toAppend.isEmpty()) {
 186                                                 String aName = toAppend.pop();
 187                                                 LedgerAccount acc = new LedgerAccount(aName);
 188                                                 acc.setHidden(lastAccount.isHidden());
 189                                                 if (!onlyStarred || !acc.isHidden())
 190                                                     accountList.add(acc);
 191                                                 L(String.format("gap-filling with %s", aName));
 192                                                 accountNames.put(aName, null);
 193                                                 profile.storeAccount(acc);
 194                                             }
 195                                         }
 196
 197                                         if (!onlyStarred || !lastAccount.isHidden())
 198                                             accountList.add(lastAccount);
 199                                         accountNames.put(acct_name, null);
 200
 201                                         state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 202                                         L("→ expecting account amount");
 203                                     }
 204                                     break;
 205
 206                                 case EXPECTING_ACCOUNT_AMOUNT:
 207                                     m = reAccountValue.matcher(line);
 208                                     boolean match_found = false;
 209                                     while (m.find()) {
 210                                         throwIfCancelled();
 211
 212                                         match_found = true;
 213                                         String value = m.group(1);
 214                                         String currency = m.group(2);
 215                                         if (currency == null) currency = "";
 216                                         value = value.replace(',', '.');
 217                                         L("curr=" + currency + ", value=" + value);
 218                                         profile.storeAccountValue(lastAccount.getName(), currency,
 219                                                 Float.valueOf(value));
 220                                         lastAccount.addAmount(Float.parseFloat(value), currency);
 221                                     }
 222
 223                                     if (match_found) {
 224                                         state = ParserState.EXPECTING_ACCOUNT;
 225                                         L("→ expecting account");
 226                                     }
 227
 228                                     break;
 229
 230                                 case EXPECTING_TRANSACTION:
 231                                     if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 232                                     m = reTransactionStart.matcher(line);
 233                                     if (m.find()) {
 234                                         transactionId = Integer.valueOf(m.group(1));
 235                                         state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 236                                         L(String.format(
 237                                                 "found transaction %d → expecting description",
 238                                                 transactionId));
 239                                         progress.setProgress(++processedTransactionCount);
 240                                         if (maxTransactionId < transactionId)
 241                                             maxTransactionId = transactionId;
 242                                         if ((progress.getTotal() == Progress.INDETERMINATE) ||
 243                                             (progress.getTotal() < transactionId))
 244                                             progress.setTotal(transactionId);
 245                                         publishProgress(progress);
 246                                     }
 247                                     m = reEnd.matcher(line);
 248                                     if (m.find()) {
 249                                         L("--- transaction value complete ---");
 250                                         break LINES;
 251                                     }
 252                                     break;
 253
 254                                 case EXPECTING_TRANSACTION_DESCRIPTION:
 255                                     if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 256                                     m = reTransactionDescription.matcher(line);
 257                                     if (m.find()) {
 258                                         if (transactionId == 0)
 259                                             throw new TransactionParserException(
 260                                                     "Transaction Id is 0 while expecting " +
 261                                                     "description");
 262
 263                                         String date = m.group(1);
 264                                         try {
 265                                             int equalsIndex = date.indexOf('=');
 266                                             if (equalsIndex >= 0)
 267                                                 date = date.substring(equalsIndex + 1);
 268                                             transaction = new LedgerTransaction(transactionId, date,
 269                                                     m.group(2));
 270                                         }
 271                                         catch (ParseException e) {
 272                                             e.printStackTrace();
 273                                             return String.format("Error parsing date '%s'", date);
 274                                         }
 275                                         state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 276                                         L(String.format("transaction %d created for %s (%s) →" +
 277                                                         " expecting details", transactionId, date,
 278                                                 m.group(2)));
 279                                     }
 280                                     break;
 281
 282                                 case EXPECTING_TRANSACTION_DETAILS:
 283                                     if (line.isEmpty()) {
 284                                         // transaction data collected
 285                                         if (transaction.existsInDb(db)) {
 286                                             db.execSQL("UPDATE transactions SET keep = 1 WHERE " +
 287                                                        "profile = ? and id=?",
 288                                                     new Object[]{profile.getUuid(),
 289                                                                  transaction.getId()
 290                                                     });
 291                                             matchedTransactionsCount++;
 292
 293                                             if (matchedTransactionsCount ==
 294                                                 MATCHING_TRANSACTIONS_LIMIT)
 295                                             {
 296                                                 db.execSQL("UPDATE transactions SET keep=1 WHERE " +
 297                                                            "profile = ? and id < ?",
 298                                                         new Object[]{profile.getUuid(),
 299                                                                      transaction.getId()
 300                                                         });
 301                                                 progress.setTotal(progress.getProgress());
 302                                                 publishProgress(progress);
 303                                                 break LINES;
 304                                             }
 305                                         }
 306                                         else {
 307                                             profile.storeTransaction(transaction);
 308                                             matchedTransactionsCount = 0;
 309                                             progress.setTotal(maxTransactionId);
 310                                         }
 311
 312                                         state = ParserState.EXPECTING_TRANSACTION;
 313                                         L(String.format(
 314                                                 "transaction %s saved → expecting transaction",
 315                                                 transaction.getId()));
 316                                         transaction.finishLoading();
 317
 318 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 319 // for example, when you add the initial seeding transaction after entering some others
 320 //                                            if (transactionId == 1) {
 321 //                                                L("This was the initial transaction. Terminating " +
 322 //                                                  "parser");
 323 //                                                break LINES;
 324 //                                            }
 325                                     }
 326                                     else {
 327                                         m = reTransactionDetails.matcher(line);
 328                                         if (m.find()) {
 329                                             String acc_name = m.group(1);
 330                                             String amount = m.group(2);
 331                                             String currency = m.group(3);
 332                                             if (currency == null) currency = "";
 333                                             amount = amount.replace(',', '.');
 334                                             transaction.addAccount(
 335                                                     new LedgerTransactionAccount(acc_name,
 336                                                             Float.valueOf(amount), currency));
 337                                             L(String.format("%d: %s = %s", transaction.getId(),
 338                                                     acc_name, amount));
 339                                         }
 340                                         else throw new IllegalStateException(String.format(
 341                                                 "Can't parse transaction %d " + "details: %s",
 342                                                 transactionId, line));
 343                                     }
 344                                     break;
 345                                 default:
 346                                     throw new RuntimeException(
 347                                             String.format("Unknown parser updating %s",
 348                                                     state.name()));
 349                             }
 350                         }
 351
 352                         throwIfCancelled();
 353
 354                         db.execSQL("DELETE FROM transactions WHERE profile=? AND keep = 0",
 355                                 new String[]{profile.getUuid()});
 356                         db.setTransactionSuccessful();
 357
 358                         Log.d("db", "Updating transaction value stamp");
 359                         Date now = new Date();
 360                         profile.setLongOption(MLDB.OPT_LAST_SCRAPE, now.getTime());
 361                         Data.lastUpdateDate.set(now);
 362
 363                         return null;
 364                     }
 365                     finally {
 366                         db.endTransaction();
 367                     }
 368                 }
 369             }
 370         }
 371         catch (MalformedURLException e) {
 372             e.printStackTrace();
 373             return "Invalid server URL";
 374         }
 375         catch (FileNotFoundException e) {
 376             e.printStackTrace();
 377             return "Invalid user name or password";
 378         }
 379         catch (IOException e) {
 380             e.printStackTrace();
 381             return "Network error";
 382         }
 383         catch (OperationCanceledException e) {
 384             e.printStackTrace();
 385             return "Operation cancelled";
 386         }
 387         finally {
 388             Data.backgroundTaskCount.decrementAndGet();
 389         }
 390     }
 391     private MainActivity getContext() {
 392         return contextRef.get();
 393     }
 394     private void throwIfCancelled() {
 395         if (isCancelled()) throw new OperationCanceledException(null);
 396     }
 397
 398     private enum ParserState {
 399         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 400         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 401     }
 402
 403     public class Progress {
 404         public static final int INDETERMINATE = -1;
 405         private int progress;
 406         private int total;
 407         Progress() {
 408             this(INDETERMINATE, INDETERMINATE);
 409         }
 410         Progress(int progress, int total) {
 411             this.progress = progress;
 412             this.total = total;
 413         }
 414         public int getProgress() {
 415             return progress;
 416         }
 417         protected void setProgress(int progress) {
 418             this.progress = progress;
 419         }
 420         public int getTotal() {
 421             return total;
 422         }
 423         protected void setTotal(int total) {
 424             this.total = total;
 425         }
 426     }
 427
 428     private class TransactionParserException extends IllegalStateException {
 429         TransactionParserException(String message) {
 430             super(message);
 431         }
 432     }
 433 }