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root |
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package tbf; |
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# kind of token-bucket-filter |
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my $max_per_client = 1e5; |
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sub new { |
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my $class = shift; |
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my %arg = @_; |
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my $self = bless \%arg, $class; |
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$self->{maxbucket} ||= $self->{rate} * 3; # max 3s bucket |
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$self->{minbucket} ||= $self->{rate}; # minimum bucket to share |
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$self->{interval} ||= $::BUFSIZE / $max_per_client; # good default interval |
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if ($self->{rate}) { |
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$self->{w} = Event->timer(hard => 1, after => 0, interval => $self->{interval}, repeat => 1, cb => sub { |
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$self->inject($self->{rate} * $self->{interval}); |
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}); |
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} else { |
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die "chaining not yet implemented\n"; |
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} |
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$self; |
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} |
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sub DESTROY { |
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my $self = shift; |
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$self->{w}->cancel; |
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} |
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sub inject { |
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my ($self, $bytes) = @_; |
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$self->{bucket} += $bytes; |
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while ($self->{bucket} >= $self->{minbucket}) { |
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if ($self->{waitw}) { |
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my $rate = $self->{bucket} / $self->{waitw}; |
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for my $v (values %{$self->{waitq}}) { |
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$self->{bucket} -= $rate * $v->[0]; |
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$v->[1] += $rate * $v->[0]; |
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if ($v->[1] >= $v->[2]) { |
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$self->{bucket} += $v->[1] - $v->[2]; |
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$v->[3]->(); |
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} |
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} |
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} else { |
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if ($self->{maxbucket} < $self->{bucket}) { |
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::slog (9, "unused bandwith: ".($self->{bucket} - $self->{maxbucket}));#d# |
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$self->{bucket} = $self->{maxbucket}; |
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} |
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} |
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last; |
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} |
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} |
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my $_tbf_id; |
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sub request { |
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my ($self, $bytes, $weight) = @_; |
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$weight ||= 1; |
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if ($self->{waitw} || $self->{bucket} < $bytes || 1) { |
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my $coro = $Coro::current; |
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my $id = $_tbf_id++; |
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$self->{waitw} += $weight; |
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$self->{waitq}{$id} = [$weight, 0, $bytes, sub { |
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delete $self->{waitq}{$id}; |
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$self->{waitw} -= $weight; |
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$coro->ready; |
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}]; |
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Coro::schedule; |
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} else { |
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$self->{bucket} -= $bytes; |
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} |
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} |
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1; |
