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.json.AccountListParser;
  27 import net.ktnx.mobileledger.json.ParsedBalance;
  28 import net.ktnx.mobileledger.json.ParsedLedgerAccount;
  29 import net.ktnx.mobileledger.json.ParsedLedgerTransaction;
  30 import net.ktnx.mobileledger.json.TransactionListParser;
  31 import net.ktnx.mobileledger.model.Data;
  32 import net.ktnx.mobileledger.model.LedgerAccount;
  33 import net.ktnx.mobileledger.model.LedgerTransaction;
  34 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  35 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  36 import net.ktnx.mobileledger.ui.activity.MainActivity;
  37 import net.ktnx.mobileledger.utils.MLDB;
  38 import net.ktnx.mobileledger.utils.NetworkUtil;
  39
  40 import java.io.BufferedReader;
  41 import java.io.FileNotFoundException;
  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 {
 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;
 116         boolean onlyStarred = Data.optShowOnlyStarred.get();
 117
 118         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 119         http.setAllowUserInteraction(false);
 120         publishProgress(progress);
 121         try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 122             try (InputStream resp = http.getInputStream()) {
 123                 if (http.getResponseCode() != 200)
 124                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 125                 db.beginTransaction();
 126                 try {
 127                     prepareDbForRetrieval(db, profile);
 128
 129                     int matchedTransactionsCount = 0;
 130
 131
 132                     ParserState state = ParserState.EXPECTING_ACCOUNT;
 133                     String line;
 134                     BufferedReader buf =
 135                             new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 136
 137                     int processedTransactionCount = 0;
 138                     int transactionId = 0;
 139                     LedgerTransaction transaction = null;
 140                     LINES:
 141                     while ((line = buf.readLine()) != null) {
 142                         throwIfCancelled();
 143                         Matcher m;
 144                         m = reComment.matcher(line);
 145                         if (m.find()) {
 146                             // TODO: comments are ignored for now
 147                             Log.v("transaction-parser", "Ignoring comment");
 148                             continue;
 149                         }
 150                         //L(String.format("State is %d", updating));
 151                         switch (state) {
 152                             case EXPECTING_ACCOUNT:
 153                                 if (line.equals("<h2>General Journal</h2>")) {
 154                                     state = ParserState.EXPECTING_TRANSACTION;
 155                                     L("→ expecting transaction");
 156                                     Data.accounts.set(accountList);
 157                                     continue;
 158                                 }
 159                                 m = reAccountName.matcher(line);
 160                                 if (m.find()) {
 161                                     String acct_encoded = m.group(1);
 162                                     String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 163                                     acct_name = acct_name.replace("\"", "");
 164                                     L(String.format("found account: %s", acct_name));
 165
 166                                     lastAccount = profile.loadAccount(acct_name);
 167                                     if (lastAccount == null) {
 168                                         lastAccount = new LedgerAccount(acct_name);
 169                                         profile.storeAccount(lastAccount);
 170                                     }
 171
 172                                     // make sure the parent account(s) are present,
 173                                     // synthesising them if necessary
 174                                     String parentName = lastAccount.getParentName();
 175                                     if (parentName != null) {
 176                                         Stack<String> toAppend = new Stack<>();
 177                                         while (parentName != null) {
 178                                             if (accountNames.containsKey(parentName)) break;
 179                                             toAppend.push(parentName);
 180                                             parentName =
 181                                                     new LedgerAccount(parentName).getParentName();
 182                                         }
 183                                         while (!toAppend.isEmpty()) {
 184                                             String aName = toAppend.pop();
 185                                             LedgerAccount acc = new LedgerAccount(aName);
 186                                             acc.setHidden(lastAccount.isHidden());
 187                                             if (!onlyStarred || !acc.isHidden())
 188                                                 accountList.add(acc);
 189                                             L(String.format("gap-filling with %s", aName));
 190                                             accountNames.put(aName, null);
 191                                             profile.storeAccount(acc);
 192                                         }
 193                                     }
 194
 195                                     if (!onlyStarred || !lastAccount.isHidden())
 196                                         accountList.add(lastAccount);
 197                                     accountNames.put(acct_name, null);
 198
 199                                     state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 200                                     L("→ expecting account amount");
 201                                 }
 202                                 break;
 203
 204                             case EXPECTING_ACCOUNT_AMOUNT:
 205                                 m = reAccountValue.matcher(line);
 206                                 boolean match_found = false;
 207                                 while (m.find()) {
 208                                     throwIfCancelled();
 209
 210                                     match_found = true;
 211                                     String value = m.group(1);
 212                                     String currency = m.group(2);
 213                                     if (currency == null) currency = "";
 214                                     value = value.replace(',', '.');
 215                                     L("curr=" + currency + ", value=" + value);
 216                                     profile.storeAccountValue(lastAccount.getName(), currency,
 217                                             Float.valueOf(value));
 218                                     lastAccount.addAmount(Float.parseFloat(value), currency);
 219                                 }
 220
 221                                 if (match_found) {
 222                                     state = ParserState.EXPECTING_ACCOUNT;
 223                                     L("→ expecting account");
 224                                 }
 225
 226                                 break;
 227
 228                             case EXPECTING_TRANSACTION:
 229                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 230                                 m = reTransactionStart.matcher(line);
 231                                 if (m.find()) {
 232                                     transactionId = Integer.valueOf(m.group(1));
 233                                     state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 234                                     L(String.format("found transaction %d → expecting description",
 235                                             transactionId));
 236                                     progress.setProgress(++processedTransactionCount);
 237                                     if (maxTransactionId < transactionId)
 238                                         maxTransactionId = transactionId;
 239                                     if ((progress.getTotal() == Progress.INDETERMINATE) ||
 240                                         (progress.getTotal() < transactionId))
 241                                         progress.setTotal(transactionId);
 242                                     publishProgress(progress);
 243                                 }
 244                                 m = reEnd.matcher(line);
 245                                 if (m.find()) {
 246                                     L("--- transaction value complete ---");
 247                                     break LINES;
 248                                 }
 249                                 break;
 250
 251                             case EXPECTING_TRANSACTION_DESCRIPTION:
 252                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 253                                 m = reTransactionDescription.matcher(line);
 254                                 if (m.find()) {
 255                                     if (transactionId == 0) throw new TransactionParserException(
 256                                             "Transaction Id is 0 while expecting " + "description");
 257
 258                                     String date = m.group(1);
 259                                     try {
 260                                         int equalsIndex = date.indexOf('=');
 261                                         if (equalsIndex >= 0)
 262                                             date = date.substring(equalsIndex + 1);
 263                                         transaction = new LedgerTransaction(transactionId, date,
 264                                                 m.group(2));
 265                                     }
 266                                     catch (ParseException e) {
 267                                         e.printStackTrace();
 268                                         return String.format("Error parsing date '%s'", date);
 269                                     }
 270                                     state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 271                                     L(String.format("transaction %d created for %s (%s) →" +
 272                                                     " expecting details", transactionId, date,
 273                                             m.group(2)));
 274                                 }
 275                                 break;
 276
 277                             case EXPECTING_TRANSACTION_DETAILS:
 278                                 if (line.isEmpty()) {
 279                                     // transaction data collected
 280                                     if (transaction.existsInDb(db)) {
 281                                         profile.markTransactionAsPresent(db, transaction);
 282                                         matchedTransactionsCount++;
 283
 284                                         if (matchedTransactionsCount ==
 285                                             MATCHING_TRANSACTIONS_LIMIT)
 286                                         {
 287                                             profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 288                                             progress.setTotal(progress.getProgress());
 289                                             publishProgress(progress);
 290                                             break LINES;
 291                                         }
 292                                     }
 293                                     else {
 294                                         profile.storeTransaction(transaction);
 295                                         matchedTransactionsCount = 0;
 296                                         progress.setTotal(maxTransactionId);
 297                                     }
 298
 299                                     state = ParserState.EXPECTING_TRANSACTION;
 300                                     L(String.format("transaction %s saved → expecting transaction",
 301                                             transaction.getId()));
 302                                     transaction.finishLoading();
 303
 304 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 305 // for example, when you add the initial seeding transaction after entering some others
 306 //                                            if (transactionId == 1) {
 307 //                                                L("This was the initial transaction. Terminating " +
 308 //                                                  "parser");
 309 //                                                break LINES;
 310 //                                            }
 311                                 }
 312                                 else {
 313                                     m = reTransactionDetails.matcher(line);
 314                                     if (m.find()) {
 315                                         String acc_name = m.group(1);
 316                                         String amount = m.group(2);
 317                                         String currency = m.group(3);
 318                                         if (currency == null) currency = "";
 319                                         amount = amount.replace(',', '.');
 320                                         transaction.addAccount(
 321                                                 new LedgerTransactionAccount(acc_name,
 322                                                         Float.valueOf(amount), currency));
 323                                         L(String.format("%d: %s = %s", transaction.getId(),
 324                                                 acc_name, amount));
 325                                     }
 326                                     else throw new IllegalStateException(String.format(
 327                                             "Can't parse transaction %d " + "details: %s",
 328                                             transactionId, line));
 329                                 }
 330                                 break;
 331                             default:
 332                                 throw new RuntimeException(
 333                                         String.format("Unknown parser updating %s", state.name()));
 334                         }
 335                     }
 336
 337                     throwIfCancelled();
 338
 339                     profile.deleteNotPresentTransactions(db);
 340                     db.setTransactionSuccessful();
 341
 342                     profile.setLastUpdateStamp();
 343
 344                     return null;
 345                 }
 346                 finally {
 347                     db.endTransaction();
 348                 }
 349             }
 350         }
 351     }
 352     private void prepareDbForRetrieval(SQLiteDatabase db, MobileLedgerProfile profile) {
 353         db.execSQL("UPDATE transactions set keep=0 where profile=?",
 354                 new String[]{profile.getUuid()});
 355         db.execSQL("update account_values set keep=0 where profile=?;",
 356                 new String[]{profile.getUuid()});
 357         db.execSQL("update accounts set keep=0 where profile=?;", new String[]{profile.getUuid()});
 358     }
 359     private boolean retrieveAccountList(MobileLedgerProfile profile) throws IOException {
 360         Progress progress = new Progress();
 361
 362         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 363         http.setAllowUserInteraction(false);
 364         publishProgress(progress);
 365         try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 366             try (InputStream resp = http.getInputStream()) {
 367                 if (http.getResponseCode() != 200)
 368                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 369
 370                 db.beginTransaction();
 371                 try {
 372                     profile.markAccountsAsNotPresent(db);
 373
 374                     AccountListParser parser = new AccountListParser(resp);
 375
 376                     while (true) {
 377                         ParsedLedgerAccount parsedAccount = parser.nextAccount();
 378                         if (parsedAccount == null) break;
 379
 380                         LedgerAccount acc = new LedgerAccount(parsedAccount.getAname());
 381                         profile.storeAccount(acc);
 382                         for (ParsedBalance b : parsedAccount.getAebalance()) {
 383                             profile.storeAccountValue(acc.getName(), b.getAcommodity(),
 384                                     b.getAquantity().asFloat());
 385                         }
 386                     }
 387
 388                     profile.deleteNotPresentAccounts(db);
 389                     db.setTransactionSuccessful();
 390                 }
 391                 finally {
 392                     db.endTransaction();
 393                 }
 394             }
 395         }
 396
 397         return true;
 398     }
 399     private boolean retrieveTransactionList(MobileLedgerProfile profile)
 400             throws IOException, ParseException {
 401         Progress progress = new Progress();
 402         int maxTransactionId = Progress.INDETERMINATE;
 403
 404         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 405         http.setAllowUserInteraction(false);
 406         publishProgress(progress);
 407         try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 408             try (InputStream resp = http.getInputStream()) {
 409                 if (http.getResponseCode() != 200)
 410                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 411                 db.beginTransaction();
 412                 try {
 413                     profile.markTransactionsAsNotPresent(db);
 414
 415                     int matchedTransactionsCount = 0;
 416                     TransactionListParser parser = new TransactionListParser(resp);
 417
 418                     int processedTransactionCount = 0;
 419
 420                     while (true) {
 421                         ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 422                         if (parsedTransaction == null) break;
 423                         LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 424                         if (transaction.existsInDb(db)) {
 425                             profile.markTransactionAsPresent(db, transaction);
 426                             matchedTransactionsCount++;
 427
 428                             if (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT) {
 429                                 profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 430                                 progress.setTotal(progress.getProgress());
 431                                 publishProgress(progress);
 432                                 db.setTransactionSuccessful();
 433                                 profile.setLastUpdateStamp();
 434                                 return true;
 435                             }
 436                         }
 437                         else {
 438                             profile.storeTransaction(transaction);
 439                             matchedTransactionsCount = 0;
 440                             progress.setTotal(maxTransactionId);
 441                         }
 442
 443                         progress.setProgress(++processedTransactionCount);
 444                         publishProgress(progress);
 445                     }
 446
 447                     profile.deleteNotPresentTransactions(db);
 448                     db.setTransactionSuccessful();
 449                     profile.setLastUpdateStamp();
 450                 }
 451                 finally {
 452                     db.endTransaction();
 453                 }
 454             }
 455         }
 456
 457         return true;
 458     }
 459     @SuppressLint("DefaultLocale")
 460     @Override
 461     protected String doInBackground(Void... params) {
 462         MobileLedgerProfile profile = Data.profile.get();
 463         Data.backgroundTaskCount.incrementAndGet();
 464         try {
 465             if (!retrieveAccountList(profile) || !retrieveTransactionList(profile))
 466                 return retrieveTransactionListLegacy(profile);
 467             return null;
 468         }
 469         catch (MalformedURLException e) {
 470             e.printStackTrace();
 471             return "Invalid server URL";
 472         }
 473         catch (FileNotFoundException e) {
 474             e.printStackTrace();
 475             return "Invalid user name or password";
 476         }
 477         catch (IOException e) {
 478             e.printStackTrace();
 479             return "Network error";
 480         }
 481         catch (ParseException e) {
 482             e.printStackTrace();
 483             return "Network error";
 484         }
 485         catch (OperationCanceledException e) {
 486             e.printStackTrace();
 487             return "Operation cancelled";
 488         }
 489         finally {
 490             Data.backgroundTaskCount.decrementAndGet();
 491         }
 492     }
 493     private MainActivity getContext() {
 494         return contextRef.get();
 495     }
 496     private void throwIfCancelled() {
 497         if (isCancelled()) throw new OperationCanceledException(null);
 498     }
 499
 500     private enum ParserState {
 501         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 502         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 503     }
 504
 505     public class Progress {
 506         public static final int INDETERMINATE = -1;
 507         private int progress;
 508         private int total;
 509         Progress() {
 510             this(INDETERMINATE, INDETERMINATE);
 511         }
 512         Progress(int progress, int total) {
 513             this.progress = progress;
 514             this.total = total;
 515         }
 516         public int getProgress() {
 517             return progress;
 518         }
 519         protected void setProgress(int progress) {
 520             this.progress = progress;
 521         }
 522         public int getTotal() {
 523             return total;
 524         }
 525         protected void setTotal(int total) {
 526             this.total = total;
 527         }
 528     }
 529
 530     private class TransactionParserException extends IllegalStateException {
 531         TransactionParserException(String message) {
 532             super(message);
 533         }
 534     }
 535 }