mirror of
https://github.com/brmlab/brmbar.git
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Initial implementation of brmbar v3 - brmbar v1 emulator brmbar-cli.pl
Uses PostgreSQL to store accounts and transactions, and Perl + Moose for the implementation. The schema is somewhat complicated, but brmburo-compatible; accounting design by TMA.
This commit is contained in:
Petr Baudis
parent
540167bfb5
commit
945ee705c3
7 changed files with 521 additions and 0 deletions
121
brmbar3/BrmBar/Account.pm
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121
brmbar3/BrmBar/Account.pm
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package BrmBar::Account;
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use strict;
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use warnings;
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use v5.10;
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use utf8;
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use encoding::warnings;
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use open qw(:encoding(UTF-8));
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use Moose;
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use Carp;
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has 'db' => (is => 'ro', isa => 'DBI::db', required => 1);
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has 'id' => (is => 'ro', isa => 'Int');
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has 'name' => (is => 'ro', isa => 'Str');
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has 'acctype' => (is => 'ro', isa => 'Str');
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has 'currency' => (is => 'ro', isa => 'BrmBar::Currency');
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sub load_by_barcode {
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my ($class, %opts) = @_;
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defined $opts{db} or croak "db parameter missing";
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my $q = $opts{db}->prepare('SELECT account FROM barcodes WHERE barcode = ?');
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$q->execute($opts{barcode});
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($opts{id}) = $q->fetchrow_array();
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defined $opts{id} or return undef;
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delete $opts{barcode};
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return $class->load(%opts);
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}
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# Constructor for existing account
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sub load {
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my ($class, %opts) = @_;
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defined $opts{db} or croak "db parameter missing";
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if (defined $opts{id}) {
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my $q = $opts{db}->prepare('SELECT name FROM accounts WHERE id = ?');
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$q->execute($opts{id});
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($opts{name}) = $q->fetchrow_array();
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} elsif (defined $opts{name}) {
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my $q = $opts{db}->prepare('SELECT id FROM accounts WHERE name = ?');
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$q->execute($opts{name});
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($opts{id}) = $q->fetchrow_array();
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}
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my $q = $opts{db}->prepare('SELECT currency, acctype FROM accounts WHERE id = ?');
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$q->execute($opts{id});
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@opts{'currency', 'acctype'} = $q->fetchrow_array();
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$opts{currency} = BrmBar::Currency->load(db => $opts{db}, id => $opts{currency});
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my $self = $class->new(%opts);
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return $self;
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}
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# Constructor for new account
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sub create {
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my ($class, %opts) = @_;
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defined $opts{db} or croak "db parameter missing";
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defined $opts{name} or croak "name parameter missing";
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defined $opts{currency} or croak "currency parameter missing";
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defined $opts{acctype} or croak "acctype parameter missing";
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my $q = $opts{db}->prepare('INSERT INTO accounts (name, currency, acctype) VALUES (?, ?, ?) RETURNING id');
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$q->execute($opts{name}, $opts{currency}->id(), $opts{acctype});
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($opts{id}) = $q->fetchrow_array();
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my $self = $class->new(%opts);
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return $self;
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}
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sub balance {
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my ($self) = @_;
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my $q = $self->db()->prepare('SELECT SUM(amount) FROM transaction_splits WHERE account = ? AND side = ?');
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$q->execute($self->id(), 'debit');
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my ($debit) = $q->fetchrow_array;
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$debit ||= 0;
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$q->execute($self->id(), 'credit');
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my ($credit) = $q->fetchrow_array;
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$credit ||= 0;
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return ($debit - $credit);
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}
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sub balance_str {
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my ($self) = @_;
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return $self->currency()->str($self->balance());
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}
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sub negbalance_str {
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my ($self) = @_;
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return $self->currency()->str(-$self->balance());
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}
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sub debit {
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my ($self, $tr, $amount, $memo) = @_;
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$self->_transaction_split($tr, 'debit', $amount, $memo);
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}
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sub credit {
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my ($self, $tr, $amount, $memo) = @_;
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$self->_transaction_split($tr, 'credit', $amount, $memo);
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}
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# Common part of credit(), debit()
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sub _transaction_split {
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my ($self, $tr, $side, $amount, $memo) = @_;
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$self->db()->prepare('INSERT INTO transaction_splits (transaction, side, account, amount, memo) VALUES (?, ?, ?, ?, ?)')->execute($tr, $side, $self->id(), $amount, $memo);
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}
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1;
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126
brmbar3/BrmBar/Currency.pm
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126
brmbar3/BrmBar/Currency.pm
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package BrmBar::Currency;
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use strict;
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use warnings;
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use v5.10;
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use utf8;
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use encoding::warnings;
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use open qw(:encoding(UTF-8));
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use Moose;
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use Carp;
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has 'db' => (is => 'ro', isa => 'DBI::db', required => 1);
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has 'id' => (is => 'ro', isa => 'Int');
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has 'name' => (is => 'ro', isa => 'Str');
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# Default wallet currency
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sub default {
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my ($class, %opts) = @_;
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return $class->load(db => $opts{db}, name => 'Kč');
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}
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# Constructor for existing currency
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sub load {
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my ($class, %opts) = @_;
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defined $opts{db} or croak "db parameter missing";
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if (defined $opts{id}) {
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my $q = $opts{db}->prepare('SELECT name FROM currencies WHERE id = ?');
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$q->execute($opts{id});
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($opts{name}) = $q->fetchrow_array();
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} elsif (defined $opts{name}) {
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my $q = $opts{db}->prepare('SELECT id FROM currencies WHERE name = ?');
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$q->execute($opts{name});
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($opts{id}) = $q->fetchrow_array();
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}
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my $self = $class->new(%opts);
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return $self;
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}
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# Constructor for new currency
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sub create {
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my ($class, %opts) = @_;
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defined $opts{db} or croak "db parameter missing";
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defined $opts{name} or croak "name parameter missing";
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my $q = $opts{db}->prepare('INSERT INTO currencies (name) VALUES (?) RETURNING id');
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$q->execute($opts{name});
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($opts{id}) = $q->fetchrow_array();
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my $self = $class->new(%opts);
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return $self;
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}
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# Set exchange rate against $other (BrmBar::Currency):
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# $buy is the price of $self in means of $other when buying it (into brmbar)
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# $sell is the price of $self in means of $other when selling it (from brmbar)
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sub set_rate {
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my ($self, $other, $buy, $sell) = @_;
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my $qs = $self->db()->prepare("SELECT rate FROM exchange_rates WHERE target = ? AND source = ?");
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my $qu = $self->db()->prepare("UPDATE exchange_rates SET rate = ?, rate_dir = ? WHERE target = ? AND source = ?");
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my $qi = $self->db()->prepare("INSERT INTO exchange_rates (target, source, rate, rate_dir) VALUES (?, ?, ?, ?)");
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$qs->execute($self->id(), $other->id());
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if ($qs->fetchrow_array) {
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$qu->execute($buy, 'target_to_source');
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} else {
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$qi->execute($self->id(), $other->id(), $buy, 'target_to_source');
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}
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$qs->execute($other->id(), $self->id());
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if ($qs->fetchrow_array) {
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$qu->execute($sell, 'source_to_target');
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} else {
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$qi->execute($other->id(), $self->id(), $sell, 'source_to_target');
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}
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}
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# Return ($buy, $sell) rates of $self in relation to $other (BrmBar::Currency):
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# $buy is the price of $self in means of $other when buying it (into brmbar)
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# $sell is the price of $self in means of $other when selling it (from brmbar)
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sub rates {
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my ($self, $other) = @_;
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my $qs = $self->db()->prepare("SELECT rate, rate_dir FROM exchange_rates WHERE target = ? AND source = ?");
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$qs->execute($self->id(), $other->id());
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my ($buy_rate, $buy_rate_dir) = $qs->fetchrow_array;
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defined $buy_rate or croak "unknown conversion ".$other->name()." to ".$self->name();
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my $buy = $buy_rate_dir eq 'target_to_source' ? $buy_rate : 1/$buy_rate;
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$qs->execute($other->id(), $self->id());
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my ($sell_rate, $sell_rate_dir) = $qs->fetchrow_array;
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defined $sell_rate or croak "unknown conversion ".$self->name()." to ".$other->name();
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my $sell = $sell_rate_dir eq 'source_to_target' ? $sell_rate : 1/$sell_rate;
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return ($buy, $sell);
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};
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sub convert {
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my ($self, $amount, $target) = @_;
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my $q = $self->db()->prepare("SELECT rate, rate_dir FROM exchange_rates WHERE target = ? AND source = ? AND valid_since <= NOW() ORDER BY valid_since ASC LIMIT 1");
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$q->execute($target->id(), $self->id());
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my ($rate, $rate_dir) = $q->fetchrow_array();
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defined $rate or croak "unknown conversion ".$self->name()." to ".$target->name();
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return $rate_dir eq 'source_to_target' ? $amount * $rate : $amount / $rate;
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}
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sub str {
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my ($self, $amount) = @_;
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return $amount . ' ' . $self->name();
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}
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1;
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20
brmbar3/BrmBar/SQL.pm
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20
brmbar3/BrmBar/SQL.pm
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package BrmBar::SQL;
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use warnings;
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use strict;
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use v5.10;
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use utf8;
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use encoding::warnings;
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use open qw(:encoding(UTF-8));
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use DBI;
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sub init {
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my ($sqlconf) = @_;
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my $db = DBI->connect("dbi:Pg:dbname=brmbar", '', '', {AutoCommit => 1, RaiseError => 1, pg_enable_utf8 => 1})
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or die "Cannot open db: ".DBI->errstr;
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$db;
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}
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1;
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73
brmbar3/BrmBar/Shop.pm
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73
brmbar3/BrmBar/Shop.pm
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package BrmBar::Shop;
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use strict;
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use warnings;
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use v5.10;
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use utf8;
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use encoding::warnings;
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use open qw(:encoding(UTF-8));
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use Moose;
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use Carp;
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use BrmBar::Currency;
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use BrmBar::Account;
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has 'db' => (is => 'ro', isa => 'DBI::db', required => 1);
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has 'currency' => (is => 'rw', isa => 'BrmBar::Currency');
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has 'profits' => (is => 'ro', isa => 'BrmBar::Account'); # income account for our margins
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has 'cash' => (is => 'ro', isa => 'BrmBar::Account'); # our operational ("wallet") cash account
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sub new_with_defaults {
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my ($class, %opts) = @_;
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return $class->new(
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db => $opts{db},
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currency => BrmBar::Currency->default(db => $opts{db}),
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profits => BrmBar::Account->load(db => $opts{db}, name => 'BrmBar Profits'),
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cash => BrmBar::Account->load(db => $opts{db}, name => 'BrmBar Cash')
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);
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}
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sub sell {
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my ($self, %opts) = @_;
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my ($item, $user, $amount) = @opts{'item', 'user', 'amount'};
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$amount ||= 1;
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my ($buy, $sell) = $item->currency()->rates($self->currency());
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my $cost = $amount * $sell;
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my $profit = $amount * ($sell - $buy);
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$self->db()->begin_work();
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my $tr = $self->_transaction(responsible => $user, description => 'BrmBar sale of '.$amount.'x '.$item->name().' to '.$user->name());
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$item->credit($tr, $amount, $user->name());
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$user->debit($tr, $cost, $item->name()); # debit (increase) on a _debt_ account
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$self->profits()->debit($tr, $profit, "Margin on ".$item->name());
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$self->db()->commit();
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return $cost;
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}
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sub add_credit {
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my ($self, %opts) = @_;
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my ($credit, $user) = @opts{'credit', 'user'};
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$self->db()->begin_work();
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my $tr = $self->_transaction(responsible => $user, description => 'BrmBar credit replenishment for '.$user->name());
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$self->cash()->debit($tr, $credit, $user->name());
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$user->credit($tr, $credit, 'Credit replenishment');
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$self->db()->commit();
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}
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# This is for internal usage of the business logic
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sub _transaction {
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my ($self, %opts) = @_;
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my ($responsible, $description) = @opts{'responsible', 'description'};
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$self->db()->prepare('INSERT INTO transactions (responsible, description) VALUES (?, ?)')->execute($responsible->id(), $description);
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}
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1;
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79
brmbar3/SQL
Normal file
79
brmbar3/SQL
Normal file
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@ -0,0 +1,79 @@
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CREATE SEQUENCE currencies_id_seq START WITH 1 INCREMENT BY 1;
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CREATE TABLE currencies (
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id INTEGER PRIMARY KEY NOT NULL DEFAULT NEXTVAL('currencies_id_seq'::regclass),
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name VARCHAR(128) NOT NULL
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);
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INSERT INTO currencies (name) VALUES ('Kč');
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CREATE TYPE exchange_rate_direction AS ENUM ('source_to_target', 'target_to_source');
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CREATE TABLE exchange_rates (
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valid_since TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW() NOT NULL,
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target INTEGER NOT NULL,
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FOREIGN KEY (target) REFERENCES currencies (id),
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source INTEGER NOT NULL,
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FOREIGN KEY (source) REFERENCES currencies (id),
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rate DECIMAL(12,2) NOT NULL,
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rate_dir exchange_rate_direction NOT NULL
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);
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-- brmbar users have 'debt' accounts; a negative balance means that
|
||||||
|
-- we have debt to the users, i.e. they are positive relative to the brmbar.
|
||||||
|
-- Positive balance means that the users have debt in brmbar.
|
||||||
|
-- Therefore, user's balance must always be shown negated.
|
||||||
|
CREATE SEQUENCE accounts_id_seq START WITH 1 INCREMENT BY 1;
|
||||||
|
CREATE TYPE account_type AS ENUM ('cash', 'debt', 'inventory', 'income', 'expense', 'starting_balance', 'ending_balance');
|
||||||
|
CREATE TABLE accounts (
|
||||||
|
id INTEGER PRIMARY KEY NOT NULL DEFAULT NEXTVAL('accounts_id_seq'::regclass),
|
||||||
|
|
||||||
|
name VARCHAR(128) NOT NULL,
|
||||||
|
|
||||||
|
currency INTEGER NOT NULL,
|
||||||
|
FOREIGN KEY (currency) REFERENCES currencies (id),
|
||||||
|
|
||||||
|
acctype account_type NOT NULL
|
||||||
|
);
|
||||||
|
INSERT INTO accounts (name, currency, acctype) VALUES ('BrmBar Cash', (SELECT id FROM currencies WHERE name='Kč'), 'cash');
|
||||||
|
INSERT INTO accounts (name, currency, acctype) VALUES ('BrmBar Profits', (SELECT id FROM currencies WHERE name='Kč'), 'income');
|
||||||
|
|
||||||
|
|
||||||
|
CREATE SEQUENCE barcodes_id_seq START WITH 1 INCREMENT BY 1;
|
||||||
|
CREATE TABLE barcodes (
|
||||||
|
barcode VARCHAR(128) PRIMARY KEY NOT NULL,
|
||||||
|
|
||||||
|
account INTEGER NOT NULL,
|
||||||
|
FOREIGN KEY (account) REFERENCES accounts (id)
|
||||||
|
);
|
||||||
|
|
||||||
|
|
||||||
|
CREATE SEQUENCE transactions_id_seq START WITH 1 INCREMENT BY 1;
|
||||||
|
CREATE TABLE transactions (
|
||||||
|
id INTEGER PRIMARY KEY NOT NULL DEFAULT NEXTVAL('transactions_id_seq'::regclass),
|
||||||
|
time TIMESTAMP DEFAULT NOW() NOT NULL,
|
||||||
|
|
||||||
|
responsible INTEGER,
|
||||||
|
FOREIGN KEY (responsible) REFERENCES accounts (id),
|
||||||
|
-- FIXME: imperfect constraint to assure this is a user
|
||||||
|
|
||||||
|
description TEXT
|
||||||
|
);
|
||||||
|
|
||||||
|
CREATE SEQUENCE transaction_splits_id_seq START WITH 1 INCREMENT BY 1;
|
||||||
|
CREATE TYPE transaction_split_side AS ENUM ('credit', 'debit');
|
||||||
|
CREATE TABLE transaction_splits (
|
||||||
|
id INTEGER PRIMARY KEY NOT NULL DEFAULT NEXTVAL('transaction_splits_id_seq'::regclass),
|
||||||
|
|
||||||
|
transaction INTEGER NOT NULL,
|
||||||
|
FOREIGN KEY (transaction) REFERENCES transactions (id),
|
||||||
|
|
||||||
|
side transaction_split_side NOT NULL,
|
||||||
|
|
||||||
|
account INTEGER NOT NULL,
|
||||||
|
FOREIGN KEY (account) REFERENCES accounts (id),
|
||||||
|
amount DECIMAL(12,2) NOT NULL,
|
||||||
|
|
||||||
|
memo TEXT
|
||||||
|
);
|
||||||
22
brmbar3/SQL.test
Normal file
22
brmbar3/SQL.test
Normal file
|
|
@ -0,0 +1,22 @@
|
||||||
|
-- Few test inserts just for debugging, to be used on clean database
|
||||||
|
|
||||||
|
INSERT INTO accounts (name, currency, acctype) VALUES ('pasky', 1, 'debt');
|
||||||
|
INSERT INTO barcodes (barcode, account) VALUES ('pasky', (SELECT id FROM accounts WHERE name = 'pasky'));
|
||||||
|
INSERT INTO accounts (name, currency, acctype) VALUES ('TMA', 1, 'debt');
|
||||||
|
INSERT INTO barcodes (barcode, account) VALUES ('TMA', (SELECT id FROM accounts WHERE name = 'TMA'));
|
||||||
|
|
||||||
|
INSERT INTO currencies (name) VALUES ('Club Mate');
|
||||||
|
INSERT INTO accounts (name, currency, acctype) VALUES ('Club Mate', (SELECT id FROM currencies WHERE name = 'Club Mate'), 'inventory');
|
||||||
|
INSERT INTO exchange_rates (target, source, rate, rate_dir) VALUES ((SELECT id FROM currencies WHERE name = 'Club Mate'), (SELECT id FROM currencies WHERE name = 'Kč'), 28, 'target_to_source');
|
||||||
|
INSERT INTO exchange_rates (target, source, rate, rate_dir) VALUES ((SELECT id FROM currencies WHERE name = 'Kč'), (SELECT id FROM currencies WHERE name = 'Club Mate'), 35, 'source_to_target');
|
||||||
|
INSERT INTO barcodes (barcode, account) VALUES ('42', (SELECT id FROM accounts WHERE name = 'Club Mate'));
|
||||||
|
|
||||||
|
INSERT INTO currencies (name) VALUES ('Deli');
|
||||||
|
INSERT INTO accounts (name, currency, acctype) VALUES ('Deli', (SELECT id FROM currencies WHERE name = 'Deli'), 'inventory');
|
||||||
|
INSERT INTO exchange_rates (target, source, rate, rate_dir) VALUES ((SELECT id FROM currencies WHERE name = 'Deli'), (SELECT id FROM currencies WHERE name = 'Kč'), 7.50, 'target_to_source');
|
||||||
|
INSERT INTO exchange_rates (target, source, rate, rate_dir) VALUES ((SELECT id FROM currencies WHERE name = 'Kč'), (SELECT id FROM currencies WHERE name = 'Deli'), 10, 'source_to_target');
|
||||||
|
INSERT INTO barcodes (barcode, account) VALUES ('43', (SELECT id FROM accounts WHERE name = 'Deli'));
|
||||||
|
|
||||||
|
INSERT INTO transactions (responsible, description) VALUES ((SELECT id FROM accounts WHERE name = 'pasky'), 'Naskladnena krabice Deli');
|
||||||
|
INSERT INTO transaction_splits (transaction, side, account, amount, memo) VALUES (1, 'credit', (SELECT id FROM accounts WHERE name = 'pasky'), 75, '10x Deli');
|
||||||
|
INSERT INTO transaction_splits (transaction, side, account, amount, memo) VALUES (1, 'debit', (SELECT id FROM accounts WHERE name = 'Deli'), 10, 'pasky');
|
||||||
80
brmbar3/brmbar-cli.pl
Executable file
80
brmbar3/brmbar-cli.pl
Executable file
|
|
@ -0,0 +1,80 @@
|
||||||
|
#!/usr/bin/perl -CSA
|
||||||
|
|
||||||
|
use warnings;
|
||||||
|
use strict;
|
||||||
|
use v5.10;
|
||||||
|
|
||||||
|
use utf8;
|
||||||
|
use encoding::warnings;
|
||||||
|
use open qw(:encoding(UTF-8));
|
||||||
|
|
||||||
|
use lib qw(.);
|
||||||
|
use BrmBar::SQL;
|
||||||
|
use BrmBar::Account;
|
||||||
|
use BrmBar::Shop;
|
||||||
|
|
||||||
|
my $db = BrmBar::SQL->init();
|
||||||
|
my $shop = BrmBar::Shop->new_with_defaults(db => $db);
|
||||||
|
my $currency = $shop->currency();
|
||||||
|
|
||||||
|
my ($active_inv_item, $active_credit);
|
||||||
|
|
||||||
|
while (<>) {
|
||||||
|
chomp;
|
||||||
|
my $barcode = $_;
|
||||||
|
|
||||||
|
if ($barcode =~ /^\$/) {
|
||||||
|
# Credit replenishment
|
||||||
|
my %credits = ('$02' => 20, '$05' => 50, '$10' => 100, '$20' => 200, '$50' => 500, '$1k' => 1000);
|
||||||
|
my $credit = $credits{$barcode};
|
||||||
|
if (not defined $credit) {
|
||||||
|
say("Unknown barcode: $barcode");
|
||||||
|
next;
|
||||||
|
}
|
||||||
|
|
||||||
|
undef $active_inv_item;
|
||||||
|
$active_credit = $credit;
|
||||||
|
next;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ($barcode eq 'SCR') {
|
||||||
|
say("SHOW CREDIT");
|
||||||
|
undef $active_inv_item;
|
||||||
|
undef $active_credit;
|
||||||
|
# In next iteration, person's barcode will for sure not be charged anything
|
||||||
|
next;
|
||||||
|
}
|
||||||
|
|
||||||
|
my $acct = BrmBar::Account->load_by_barcode(db => $db, barcode => $barcode);
|
||||||
|
if (not $acct) {
|
||||||
|
say("Unknown barcode: $barcode");
|
||||||
|
next;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ($acct->acctype() eq 'debt') {
|
||||||
|
if (defined $active_inv_item) {
|
||||||
|
my $cost = $shop->sell(item => $active_inv_item, user => $acct);
|
||||||
|
say($acct->name()." has bought ".$active_inv_item->name()." for ".$currency->str($cost)." and now has ".$acct->negbalance_str()." balance");
|
||||||
|
} elsif (defined $active_credit) {
|
||||||
|
$shop->add_credit(credit => $active_credit, user => $acct);
|
||||||
|
say($acct->name()." has added ".$currency->str($active_credit)." credit");
|
||||||
|
} else {
|
||||||
|
say($acct->name()." has ".$acct->negbalance_str()." balance");
|
||||||
|
}
|
||||||
|
|
||||||
|
undef $active_inv_item;
|
||||||
|
undef $active_credit;
|
||||||
|
|
||||||
|
} elsif ($acct->acctype() eq 'inventory') {
|
||||||
|
my ($buy, $sell) = $acct->currency()->rates($currency);
|
||||||
|
say($acct->name()." costs ".$currency->str($sell)." with ".$acct->balance()." in stock");
|
||||||
|
|
||||||
|
$active_inv_item = $acct;
|
||||||
|
undef $active_credit;
|
||||||
|
|
||||||
|
} else {
|
||||||
|
say("invalid account type ".$acct->acctype());
|
||||||
|
undef $active_inv_item;
|
||||||
|
undef $active_credit;
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Add table
Add a link
Reference in a new issue