# 2014 October 21
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This file contains tests for the RBU module. Specifically, it tests the
# outcome of some other client writing to the database while an RBU update
# is being applied.

if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. test]
}
source $testdir/tester.tcl
set ::testprefix rbu6

proc setup_test {} {
  reset_db
  execsql {
    CREATE TABLE t1(a INTEGER PRIMARY KEY, b UNIQUE);
    CREATE TABLE t2(a INTEGER PRIMARY KEY, b UNIQUE);
    CREATE TABLE t3(a INTEGER PRIMARY KEY, b UNIQUE);
  }
  db close

  forcedelete rbu.db
  sqlite3 rbu rbu.db
  rbu eval {
    CREATE TABLE data_t1(a, b, rbu_control);
    CREATE TABLE data_t2(a, b, rbu_control);
    CREATE TABLE data_t3(a, b, rbu_control);
    INSERT INTO data_t1 VALUES(1, 't1', 0);
    INSERT INTO data_t2 VALUES(2, 't2', 0);
    INSERT INTO data_t3 VALUES(3, 't3', 0);
  }
  rbu close
}

# Test the outcome of some other client writing the db while the *-oal 
# file is being generated. Once this has happened, the update cannot be
# progressed.
#
for {set nStep 1} {$nStep < 8} {incr nStep} {
  do_test 1.$nStep.1 {
    setup_test
    sqlite3rbu rbu test.db rbu.db
    for {set i 0} {$i<$nStep} {incr i} {rbu step}

    rbu close
    sqlite3 db test.db
    execsql { INSERT INTO t1 VALUES(5, 'hello') }
    sqlite3rbu rbu test.db rbu.db
    rbu step
  } {SQLITE_BUSY}
  do_test 1.$nStep.2 {
    rbu step
  } {SQLITE_BUSY}
  do_test 1.$nStep.3 {
    list [file exists test.db-oal] [file exists test.db-wal]
  } {1 0}
  do_test 1.$nStep.4 {
    list [catch { rbu close } msg] $msg
  } {1 {SQLITE_BUSY - database modified during rbu update}}
}

# Test the outcome of some other client writing the db after the *-oal
# file has been copied to the *-wal path. Once this has happened, any
# other client writing to the db causes RBU to consider its job finished.
#
for {set nStep 8} {$nStep < 20} {incr nStep} {
  do_test 1.$nStep.1 {
    setup_test
    sqlite3rbu rbu test.db rbu.db
    for {set i 0} {$i<$nStep} {incr i} {rbu step}
    rbu close
    sqlite3 db test.db
    execsql { INSERT INTO t1 VALUES(5, 'hello') }
    sqlite3rbu rbu test.db rbu.db
    rbu step
  } {SQLITE_DONE}
  do_test 1.$nStep.2 {
    rbu step
  } {SQLITE_DONE}
  do_test 1.$nStep.3 {
    file exists test.db-oal
  } {0}
  do_test 1.$nStep.4 {
    list [catch { rbu close } msg] $msg
  } {0 SQLITE_DONE}

  do_execsql_test 1.$nStep.5 {
    SELECT * FROM t1;
  } {1 t1 5 hello}
}


finish_test