/usr/share/perl5/Prophet/Conflict.pm is in libprophet-perl 0.750-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 | package Prophet::Conflict;
use Any::Moose;
use Params::Validate;
use Prophet::ConflictingPropChange;
use Prophet::ConflictingChange;
has prophet_handle => (
is => 'rw',
isa => 'Prophet::Replica',
);
has resolvers => (
is => 'rw',
isa => 'ArrayRef',
default => sub { [] },
auto_deref => 1,
);
has changeset => (
is => 'rw',
isa => 'Prophet::ChangeSet',
);
has nullification_changeset => (
is => 'rw',
isa => 'Prophet::ChangeSet',
);
has resolution_changeset => (
is => 'rw',
isa => 'Prophet::ChangeSet',
);
has autoresolved => (
is => 'rw',
isa => 'Bool',
);
has conflicting_changes => (
is => 'ro',
isa => 'ArrayRef',
default => sub { [] },
);
sub has_conflicting_changes { scalar @{ $_[0]->conflicting_changes } }
sub add_conflicting_change {
my $self = shift;
push @{ $self->conflicting_changes }, @_;
}
=head2 analyze_changeset Prophet::ChangeSet
Take a look at a changeset. if there are any conflicts, populate
the L<conflicting_changes> array on this object with a set of
L<Prophet::ConflictingChange> objects.
=cut
sub analyze_changeset {
my $self = shift;
#my ($changeset) = validate_pos( @_, { isa => 'Prophet::ChangeSet' } );
$self->generate_changeset_conflicts();
return unless $self->has_conflicting_changes;
$self->generate_nullification_changeset;
return 1;
}
use Prophet::Resolver::IdenticalChanges;
use Prophet::Resolver::FromResolutionDB;
use Prophet::Resolver::Fixup::MissingSourceOldValues;
use Prophet::Resolver::Failed;
use Prophet::Resolver::Prompt;
sub generate_resolution {
my $self = shift;
my $resdb = shift;
my @resolvers = (
sub { Prophet::Resolver::IdenticalChanges->new->run(@_); },
$resdb ? sub { Prophet::Resolver::FromResolutionDB->new->run(@_) } : (),
$self->resolvers,
sub { Prophet::Resolver::Fixup::MissingSourceOldValues->new->run(@_)},
(-t STDIN && -t STDOUT) ? sub { Prophet::Resolver::Prompt->new->run(@_) } : (),
sub { Prophet::Resolver::Failed->new->run(@_) },
);
my $resolutions = Prophet::ChangeSet->new({
creator => $self->prophet_handle->changeset_creator,
is_resolution => 1,
});
for my $conflicting_change ( @{ $self->conflicting_changes } ) {
for (@resolvers) {
if ( my $resolution = $_->( $conflicting_change, $self, $resdb ) ) {
$resolutions->add_change( change => $resolution ) if $resolution->has_prop_changes;
last;
}
}
}
$self->resolution_changeset($resolutions);
return 1;
}
=head2 generate_changeset_conflicts
Given a changeset, populates $self->conflicting_changes with all the conflicts that applying that changeset to the target replica would result in.
=cut
sub generate_changeset_conflicts {
my $self = shift;
for my $change ( $self->changeset->changes ) {
if ( my $change_conflicts = $self->_generate_change_conflicts($change) ) {
$self->add_conflicting_change($change_conflicts);
}
}
}
=head2 _generate_change_conflicts Prophet::Change
Given a change, generates a set of Prophet::ConflictingChange entries.
=cut
sub _generate_change_conflicts {
my $self = shift;
my ($change) = validate_pos( @_, { isa => "Prophet::Change" } );
my $file_op_conflict;
my $file_exists = $self->prophet_handle->record_exists(
uuid => $change->record_uuid,
type => $change->record_type
);
# It's ok to delete a record that exists
if ( $change->change_type eq 'delete' && !$file_exists ) {
$file_op_conflict = "delete_missing_file";
}
elsif ( $change->change_type eq 'update_file' && !$file_exists ) {
$file_op_conflict = "update_missing_file";
}
elsif ( $change->change_type eq 'add_file' && $file_exists ) {
# we can recover from "Trying to add a file which exists" by converting it to an "update file"
# operation. This should ONLY ever happen on settings conflicts
$change->change_type('update_file');
}
elsif ( $change->change_type eq 'add_dir' && $file_exists ) {
# XXX TODO: this isn't right
$file_op_conflict = "create_existing_dir";
}
my $change_conflict = Prophet::ConflictingChange->new(
{
record_type => $change->record_type,
record_uuid => $change->record_uuid,
target_record_exists => ($file_exists ? 1 : 0 ),
change_type => $change->change_type,
$file_op_conflict ? ( file_op_conflict => $file_op_conflict ) : (),
}
);
if ($file_exists) {
my $current_state = $self->prophet_handle->get_record_props(
uuid => $change->record_uuid,
type => $change->record_type
);
$change_conflict->add_prop_conflict(
$self->_generate_prop_change_conflicts( $change, $current_state ) );
}
return ( $change_conflict->has_prop_conflicts || $file_op_conflict )
? $change_conflict
: undef;
}
=head2 _generate_prop_change_conflicts Prophet::Change %hash_of_current_properties
Given a change and the current state of a record, returns an array of Prophet::ConflictingPropChange objects describing conflicts which would occur if the change were applied
=cut
sub _generate_prop_change_conflicts {
my $self = shift;
my $change = shift;
my $current_state = shift;
my @prop_conflicts;
for my $prop_change ( $change->prop_changes ) {
# skip properties added by the change
next if ( !defined $current_state->{ $prop_change->name } && !defined $prop_change->old_value );
# If either the old version didn't have a value or the delta didn't have a value, then we know there's a conflict
my $s = {
name => $prop_change->name,
source_old_value => $prop_change->old_value,
target_value => $current_state->{ $prop_change->name },
source_new_value => $prop_change->new_value
};
my $old_exists =
( defined $prop_change->old_value && $prop_change->old_value ne '' )
? 1
: 0;
my $current_exists =
exists $current_state->{ $prop_change->name }
? 1
: 0;
no warnings 'uninitialized';
if (
( $current_exists != $old_exists)
|| ( $current_state->{ $prop_change->name } ne $prop_change->old_value ) )
{
push @prop_conflicts, Prophet::ConflictingPropChange->new($s);
}
}
return @prop_conflicts;
}
=head2 generate_nullification_changeset
In order to record a changeset which might not apply cleanly to the
current state of a replica, Prophet generates a I<nullification
changeset>. That is, a changeset which sets the state of the replica
back to what it needs to be in order to apply the new changeset.
This routine computes a new L<Prophet::ChangeSet> which contains
everything needed to nullify the conflicting state of the replica.
=cut
sub generate_nullification_changeset {
my $self = shift;
my $nullification = Prophet::ChangeSet->new({
is_nullification => 1,
creator => undef,
created => undef,
});
for my $conflict ( @{ $self->conflicting_changes } ) {
my $nullify_conflict
= Prophet::Change->new( { record_type => $conflict->record_type, record_uuid => $conflict->record_uuid } );
my $file_op_conflict = $conflict->file_op_conflict || '';
if ( $file_op_conflict eq "delete_missing_file" ) {
$nullify_conflict->change_type('add_file');
} elsif ( $file_op_conflict eq "update_missing_file" ) {
$nullify_conflict->change_type('add_file');
} elsif ( $file_op_conflict eq "create_existing_file" ) {
$nullify_conflict->change_type('delete');
} elsif ( $file_op_conflict ) {
die "We don't know how to deal with a conflict of type " . $conflict->file_op_conflict;
} else {
$nullify_conflict->change_type('update_file');
}
# now that we've sorted out all the file-level conflicts, we need to get properties in order
for my $prop_conflict ( @{ $conflict->prop_conflicts } ) {
$nullify_conflict->add_prop_change(
name => $prop_conflict->name,
old => $prop_conflict->target_value,
new => $prop_conflict->source_old_value
);
}
$nullification->add_change( change => $nullify_conflict );
}
$self->nullification_changeset($nullification);
}
__PACKAGE__->meta->make_immutable;
no Any::Moose;
1;
|