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.err.HTTPException;
  27 import net.ktnx.mobileledger.json.AccountListParser;
  28 import net.ktnx.mobileledger.json.ParsedBalance;
  29 import net.ktnx.mobileledger.json.ParsedLedgerAccount;
  30 import net.ktnx.mobileledger.json.ParsedLedgerTransaction;
  31 import net.ktnx.mobileledger.json.TransactionListParser;
  32 import net.ktnx.mobileledger.model.Data;
  33 import net.ktnx.mobileledger.model.LedgerAccount;
  34 import net.ktnx.mobileledger.model.LedgerTransaction;
  35 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  36 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  37 import net.ktnx.mobileledger.ui.activity.MainActivity;
  38 import net.ktnx.mobileledger.utils.MLDB;
  39 import net.ktnx.mobileledger.utils.NetworkUtil;
  40
  41 import java.io.BufferedReader;
  42 import java.io.IOException;
  43 import java.io.InputStream;
  44 import java.io.InputStreamReader;
  45 import java.lang.ref.WeakReference;
  46 import java.net.HttpURLConnection;
  47 import java.net.MalformedURLException;
  48 import java.net.URLDecoder;
  49 import java.nio.charset.StandardCharsets;
  50 import java.text.ParseException;
  51 import java.util.ArrayList;
  52 import java.util.HashMap;
  53 import java.util.Stack;
  54 import java.util.regex.Matcher;
  55 import java.util.regex.Pattern;
  56
  57
  58 public class RetrieveTransactionsTask
  59         extends AsyncTask<Void, RetrieveTransactionsTask.Progress, String> {
  60     private static final int MATCHING_TRANSACTIONS_LIMIT = 50;
  61     private static final Pattern reComment = Pattern.compile("^\\s*;");
  62     private static final Pattern reTransactionStart = Pattern.compile("<tr class=\"title\" " +
  63                                                                       "id=\"transaction-(\\d+)\"><td class=\"date\"[^\"]*>([\\d.-]+)</td>");
  64     private static final Pattern reTransactionDescription =
  65             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  66     private static final Pattern reTransactionDetails =
  67             Pattern.compile("^\\s+(\\S[\\S\\s]+\\S)\\s\\s+([-+]?\\d[\\d,.]*)(?:\\s+(\\S+)$)?");
  68     private static final Pattern reEnd = Pattern.compile("\\bid=\"addmodal\"");
  69     private WeakReference<MainActivity> contextRef;
  70     private int error;
  71     // %3A is '='
  72     private Pattern reAccountName = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  73     private Pattern reAccountValue = Pattern.compile(
  74             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  75     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef) {
  76         this.contextRef = contextRef;
  77     }
  78     private static void L(String msg) {
  79         //Log.d("transaction-parser", msg);
  80     }
  81     @Override
  82     protected void onProgressUpdate(Progress... values) {
  83         super.onProgressUpdate(values);
  84         MainActivity context = getContext();
  85         if (context == null) return;
  86         context.onRetrieveProgress(values[0]);
  87     }
  88     @Override
  89     protected void onPreExecute() {
  90         super.onPreExecute();
  91         MainActivity context = getContext();
  92         if (context == null) return;
  93         context.onRetrieveStart();
  94     }
  95     @Override
  96     protected void onPostExecute(String error) {
  97         super.onPostExecute(error);
  98         MainActivity context = getContext();
  99         if (context == null) return;
 100         context.onRetrieveDone(error);
 101     }
 102     @Override
 103     protected void onCancelled() {
 104         super.onCancelled();
 105         MainActivity context = getContext();
 106         if (context == null) return;
 107         context.onRetrieveDone(null);
 108     }
 109     private String retrieveTransactionListLegacy(MobileLedgerProfile profile)
 110             throws IOException, ParseException, HTTPException {
 111         Progress progress = new Progress();
 112         int maxTransactionId = Progress.INDETERMINATE;
 113         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 114         HashMap<String, Void> accountNames = new HashMap<>();
 115         LedgerAccount lastAccount = null, prevAccount = null;
 116         boolean onlyStarred = Data.optShowOnlyStarred.get();
 117
 118         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 119         http.setAllowUserInteraction(false);
 120         publishProgress(progress);
 121         switch (http.getResponseCode()) {
 122             case 200:
 123                 break;
 124             default:
 125                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 126         }
 127         try (SQLiteDatabase db = MLDB.getDatabase()) {
 128             try (InputStream resp = http.getInputStream()) {
 129                 if (http.getResponseCode() != 200)
 130                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 131                 db.beginTransaction();
 132                 try {
 133                     prepareDbForRetrieval(db, profile);
 134
 135                     int matchedTransactionsCount = 0;
 136
 137
 138                     ParserState state = ParserState.EXPECTING_ACCOUNT;
 139                     String line;
 140                     BufferedReader buf =
 141                             new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 142
 143                     int processedTransactionCount = 0;
 144                     int transactionId = 0;
 145                     LedgerTransaction transaction = null;
 146                     LINES:
 147                     while ((line = buf.readLine()) != null) {
 148                         throwIfCancelled();
 149                         Matcher m;
 150                         m = reComment.matcher(line);
 151                         if (m.find()) {
 152                             // TODO: comments are ignored for now
 153                             Log.v("transaction-parser", "Ignoring comment");
 154                             continue;
 155                         }
 156                         //L(String.format("State is %d", updating));
 157                         switch (state) {
 158                             case EXPECTING_ACCOUNT:
 159                                 if (line.equals("<h2>General Journal</h2>")) {
 160                                     state = ParserState.EXPECTING_TRANSACTION;
 161                                     L("→ expecting transaction");
 162                                     // commit the current transaction and start a new one
 163                                     // the account list in the UI should reflect the (committed)
 164                                     // state of the database
 165                                     db.setTransactionSuccessful();
 166                                     db.endTransaction();
 167                                     Data.accounts.setList(accountList);
 168                                     db.beginTransaction();
 169                                     continue;
 170                                 }
 171                                 m = reAccountName.matcher(line);
 172                                 if (m.find()) {
 173                                     String acct_encoded = m.group(1);
 174                                     String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 175                                     acct_name = acct_name.replace("\"", "");
 176                                     L(String.format("found account: %s", acct_name));
 177
 178                                     prevAccount = lastAccount;
 179                                     lastAccount = profile.tryLoadAccount(db, acct_name);
 180                                     if (lastAccount == null)
 181                                         lastAccount = new LedgerAccount(acct_name);
 182                                     else lastAccount.removeAmounts();
 183                                     profile.storeAccount(db, lastAccount);
 184
 185                                     if (prevAccount != null) prevAccount
 186                                             .setHasSubAccounts(prevAccount.isParentOf(lastAccount));
 187                                     // make sure the parent account(s) are present,
 188                                     // synthesising them if necessary
 189                                     String parentName = lastAccount.getParentName();
 190                                     if (parentName != null) {
 191                                         Stack<String> toAppend = new Stack<>();
 192                                         while (parentName != null) {
 193                                             if (accountNames.containsKey(parentName)) break;
 194                                             toAppend.push(parentName);
 195                                             parentName =
 196                                                     new LedgerAccount(parentName).getParentName();
 197                                         }
 198                                         while (!toAppend.isEmpty()) {
 199                                             String aName = toAppend.pop();
 200                                             LedgerAccount acc = new LedgerAccount(aName);
 201                                             acc.setHiddenByStar(lastAccount.isHiddenByStar());
 202                                             acc.setHasSubAccounts(true);
 203                                             if ((!onlyStarred || !acc.isHiddenByStar()) &&
 204                                                 acc.isVisible(accountList)) accountList.add(acc);
 205                                             L(String.format("gap-filling with %s", aName));
 206                                             accountNames.put(aName, null);
 207                                             profile.storeAccount(db, acc);
 208                                         }
 209                                     }
 210
 211                                     if ((!onlyStarred || !lastAccount.isHiddenByStar()) &&
 212                                         lastAccount.isVisible(accountList))
 213                                         accountList.add(lastAccount);
 214                                     accountNames.put(acct_name, null);
 215
 216                                     state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 217                                     L("→ expecting account amount");
 218                                 }
 219                                 break;
 220
 221                             case EXPECTING_ACCOUNT_AMOUNT:
 222                                 m = reAccountValue.matcher(line);
 223                                 boolean match_found = false;
 224                                 while (m.find()) {
 225                                     throwIfCancelled();
 226
 227                                     match_found = true;
 228                                     String value = m.group(1);
 229                                     String currency = m.group(2);
 230                                     if (currency == null) currency = "";
 231                                     value = value.replace(',', '.');
 232                                     L("curr=" + currency + ", value=" + value);
 233                                     profile.storeAccountValue(db, lastAccount.getName(), currency,
 234                                             Float.valueOf(value));
 235                                     lastAccount.addAmount(Float.parseFloat(value), currency);
 236                                 }
 237
 238                                 if (match_found) {
 239                                     state = ParserState.EXPECTING_ACCOUNT;
 240                                     L("→ expecting account");
 241                                 }
 242
 243                                 break;
 244
 245                             case EXPECTING_TRANSACTION:
 246                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 247                                 m = reTransactionStart.matcher(line);
 248                                 if (m.find()) {
 249                                     transactionId = Integer.valueOf(m.group(1));
 250                                     state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 251                                     L(String.format("found transaction %d → expecting description",
 252                                             transactionId));
 253                                     progress.setProgress(++processedTransactionCount);
 254                                     if (maxTransactionId < transactionId)
 255                                         maxTransactionId = transactionId;
 256                                     if ((progress.getTotal() == Progress.INDETERMINATE) ||
 257                                         (progress.getTotal() < transactionId))
 258                                         progress.setTotal(transactionId);
 259                                     publishProgress(progress);
 260                                 }
 261                                 m = reEnd.matcher(line);
 262                                 if (m.find()) {
 263                                     L("--- transaction value complete ---");
 264                                     break LINES;
 265                                 }
 266                                 break;
 267
 268                             case EXPECTING_TRANSACTION_DESCRIPTION:
 269                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 270                                 m = reTransactionDescription.matcher(line);
 271                                 if (m.find()) {
 272                                     if (transactionId == 0) throw new TransactionParserException(
 273                                             "Transaction Id is 0 while expecting " + "description");
 274
 275                                     String date = m.group(1);
 276                                     try {
 277                                         int equalsIndex = date.indexOf('=');
 278                                         if (equalsIndex >= 0)
 279                                             date = date.substring(equalsIndex + 1);
 280                                         transaction = new LedgerTransaction(transactionId, date,
 281                                                 m.group(2));
 282                                     }
 283                                     catch (ParseException e) {
 284                                         e.printStackTrace();
 285                                         return String.format("Error parsing date '%s'", date);
 286                                     }
 287                                     state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 288                                     L(String.format("transaction %d created for %s (%s) →" +
 289                                                     " expecting details", transactionId, date,
 290                                             m.group(2)));
 291                                 }
 292                                 break;
 293
 294                             case EXPECTING_TRANSACTION_DETAILS:
 295                                 if (line.isEmpty()) {
 296                                     // transaction data collected
 297                                     if (transaction.existsInDb(db)) {
 298                                         profile.markTransactionAsPresent(db, transaction);
 299                                         matchedTransactionsCount++;
 300
 301                                         if (matchedTransactionsCount ==
 302                                             MATCHING_TRANSACTIONS_LIMIT)
 303                                         {
 304                                             profile.markTransactionsBeforeTransactionAsPresent(db,
 305                                                     transaction);
 306                                             progress.setTotal(progress.getProgress());
 307                                             publishProgress(progress);
 308                                             break LINES;
 309                                         }
 310                                     }
 311                                     else {
 312                                         profile.storeTransaction(db, transaction);
 313                                         matchedTransactionsCount = 0;
 314                                         progress.setTotal(maxTransactionId);
 315                                     }
 316
 317                                     state = ParserState.EXPECTING_TRANSACTION;
 318                                     L(String.format("transaction %s saved → expecting transaction",
 319                                             transaction.getId()));
 320                                     transaction.finishLoading();
 321
 322 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 323 // for example, when you add the initial seeding transaction after entering some others
 324 //                                            if (transactionId == 1) {
 325 //                                                L("This was the initial transaction. Terminating " +
 326 //                                                  "parser");
 327 //                                                break LINES;
 328 //                                            }
 329                                 }
 330                                 else {
 331                                     m = reTransactionDetails.matcher(line);
 332                                     if (m.find()) {
 333                                         String acc_name = m.group(1);
 334                                         String amount = m.group(2);
 335                                         String currency = m.group(3);
 336                                         if (currency == null) currency = "";
 337                                         amount = amount.replace(',', '.');
 338                                         transaction.addAccount(
 339                                                 new LedgerTransactionAccount(acc_name,
 340                                                         Float.valueOf(amount), currency));
 341                                         L(String.format("%d: %s = %s", transaction.getId(),
 342                                                 acc_name, amount));
 343                                     }
 344                                     else throw new IllegalStateException(String.format(
 345                                             "Can't parse transaction %d " + "details: %s",
 346                                             transactionId, line));
 347                                 }
 348                                 break;
 349                             default:
 350                                 throw new RuntimeException(
 351                                         String.format("Unknown parser updating %s", state.name()));
 352                         }
 353                     }
 354
 355                     throwIfCancelled();
 356
 357                     profile.deleteNotPresentTransactions(db);
 358                     db.setTransactionSuccessful();
 359
 360                     profile.setLastUpdateStamp();
 361
 362                     return null;
 363                 }
 364                 finally {
 365                     db.endTransaction();
 366                 }
 367             }
 368         }
 369     }
 370     private void prepareDbForRetrieval(SQLiteDatabase db, MobileLedgerProfile profile) {
 371         db.execSQL("UPDATE transactions set keep=0 where profile=?",
 372                 new String[]{profile.getUuid()});
 373         db.execSQL("update account_values set keep=0 where profile=?;",
 374                 new String[]{profile.getUuid()});
 375         db.execSQL("update accounts set keep=0 where profile=?;", new String[]{profile.getUuid()});
 376     }
 377     private boolean retrieveAccountList(MobileLedgerProfile profile)
 378             throws IOException, HTTPException {
 379         Progress progress = new Progress();
 380
 381         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 382         http.setAllowUserInteraction(false);
 383         switch (http.getResponseCode()) {
 384             case 200:
 385                 break;
 386             case 404:
 387                 return false;
 388             default:
 389                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 390         }
 391         publishProgress(progress);
 392         SQLiteDatabase db = MLDB.getDatabase();
 393         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 394         boolean listFilledOK = false;
 395         try (InputStream resp = http.getInputStream()) {
 396             if (http.getResponseCode() != 200)
 397                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 398
 399             db.beginTransaction();
 400             try {
 401                 profile.markAccountsAsNotPresent(db);
 402
 403                 AccountListParser parser = new AccountListParser(resp);
 404
 405                 LedgerAccount prevAccount = null;
 406
 407                 while (true) {
 408                     throwIfCancelled();
 409                     ParsedLedgerAccount parsedAccount = parser.nextAccount();
 410                     if (parsedAccount == null) break;
 411
 412                     LedgerAccount acc = profile.tryLoadAccount(db, parsedAccount.getAname());
 413                     if (acc == null) acc = new LedgerAccount(parsedAccount.getAname());
 414                     else acc.removeAmounts();
 415
 416                     profile.storeAccount(db, acc);
 417                     for (ParsedBalance b : parsedAccount.getAebalance()) {
 418                         profile.storeAccountValue(db, acc.getName(), b.getAcommodity(),
 419                                 b.getAquantity().asFloat());
 420                     }
 421
 422                     if (acc.isVisible(accountList)) accountList.add(acc);
 423
 424                     if (prevAccount != null) {
 425                         prevAccount.setHasSubAccounts(
 426                                 acc.getName().startsWith(prevAccount.getName() + ":"));
 427                     }
 428
 429                     prevAccount = acc;
 430                 }
 431                 throwIfCancelled();
 432
 433                 profile.deleteNotPresentAccounts(db);
 434                 throwIfCancelled();
 435                 db.setTransactionSuccessful();
 436                 listFilledOK = true;
 437             }
 438             finally {
 439                 db.endTransaction();
 440             }
 441         }
 442         // should not be set in the DB transaction, because of a possible deadlock
 443         // with the main and DbOpQueueRunner threads
 444         if (listFilledOK) Data.accounts.setList(accountList);
 445
 446         return true;
 447     }
 448     private boolean retrieveTransactionList(MobileLedgerProfile profile)
 449             throws IOException, ParseException, HTTPException {
 450         Progress progress = new Progress();
 451         int maxTransactionId = Progress.INDETERMINATE;
 452
 453         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 454         http.setAllowUserInteraction(false);
 455         publishProgress(progress);
 456         switch (http.getResponseCode()) {
 457             case 200:
 458                 break;
 459             case 404:
 460                 return false;
 461             default:
 462                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 463         }
 464         SQLiteDatabase db = MLDB.getDatabase();
 465         try (InputStream resp = http.getInputStream()) {
 466             if (http.getResponseCode() != 200)
 467                 throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 468             throwIfCancelled();
 469             db.beginTransaction();
 470             try {
 471                 profile.markTransactionsAsNotPresent(db);
 472
 473                 int matchedTransactionsCount = 0;
 474                 TransactionListParser parser = new TransactionListParser(resp);
 475
 476                 int processedTransactionCount = 0;
 477
 478                 while (true) {
 479                     throwIfCancelled();
 480                     ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 481                     throwIfCancelled();
 482                     if (parsedTransaction == null) break;
 483                     LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 484                     if (transaction.existsInDb(db)) {
 485                         profile.markTransactionAsPresent(db, transaction);
 486                         matchedTransactionsCount++;
 487
 488                         if (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT) {
 489                             profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 490                             progress.setTotal(progress.getProgress());
 491                             publishProgress(progress);
 492                             db.setTransactionSuccessful();
 493                             profile.setLastUpdateStamp();
 494                             return true;
 495                         }
 496                     }
 497                     else {
 498                         profile.storeTransaction(db, transaction);
 499                         matchedTransactionsCount = 0;
 500                         progress.setTotal(maxTransactionId);
 501                     }
 502
 503                     if ((progress.getTotal() == Progress.INDETERMINATE) ||
 504                         (progress.getTotal() < transaction.getId()))
 505                         progress.setTotal(transaction.getId());
 506
 507                     progress.setProgress(++processedTransactionCount);
 508                     publishProgress(progress);
 509                 }
 510
 511                 throwIfCancelled();
 512                 profile.deleteNotPresentTransactions(db);
 513                 throwIfCancelled();
 514                 db.setTransactionSuccessful();
 515                 profile.setLastUpdateStamp();
 516             }
 517             finally {
 518                 db.endTransaction();
 519             }
 520         }
 521
 522         return true;
 523     }
 524     @SuppressLint("DefaultLocale")
 525     @Override
 526     protected String doInBackground(Void... params) {
 527         MobileLedgerProfile profile = Data.profile.get();
 528         Data.backgroundTaskCount.incrementAndGet();
 529         try {
 530             if (!retrieveAccountList(profile) || !retrieveTransactionList(profile))
 531                 return retrieveTransactionListLegacy(profile);
 532             return null;
 533         }
 534         catch (MalformedURLException e) {
 535             e.printStackTrace();
 536             return "Invalid server URL";
 537         }
 538         catch (HTTPException e) {
 539             e.printStackTrace();
 540             return String.format("HTTP error %d: %s", e.getResponseCode(), e.getResponseMessage());
 541         }
 542         catch (IOException e) {
 543             e.printStackTrace();
 544             return e.getLocalizedMessage();
 545         }
 546         catch (ParseException e) {
 547             e.printStackTrace();
 548             return "Network error";
 549         }
 550         catch (OperationCanceledException e) {
 551             e.printStackTrace();
 552             return "Operation cancelled";
 553         }
 554         finally {
 555             Data.backgroundTaskCount.decrementAndGet();
 556         }
 557     }
 558     private MainActivity getContext() {
 559         return contextRef.get();
 560     }
 561     private void throwIfCancelled() {
 562         if (isCancelled()) throw new OperationCanceledException(null);
 563     }
 564
 565     private enum ParserState {
 566         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 567         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 568     }
 569
 570     public class Progress {
 571         public static final int INDETERMINATE = -1;
 572         private int progress;
 573         private int total;
 574         Progress() {
 575             this(INDETERMINATE, INDETERMINATE);
 576         }
 577         Progress(int progress, int total) {
 578             this.progress = progress;
 579             this.total = total;
 580         }
 581         public int getProgress() {
 582             return progress;
 583         }
 584         protected void setProgress(int progress) {
 585             this.progress = progress;
 586         }
 587         public int getTotal() {
 588             return total;
 589         }
 590         protected void setTotal(int total) {
 591             this.total = total;
 592         }
 593     }
 594
 595     private class TransactionParserException extends IllegalStateException {
 596         TransactionParserException(String message) {
 597             super(message);
 598         }
 599     }
 600 }