61 lines
1.8 KiB
Go
61 lines
1.8 KiB
Go
package leakybucket
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import (
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"fmt"
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"time"
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"github.com/antonmedv/expr"
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"github.com/antonmedv/expr/vm"
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"github.com/crowdsecurity/crowdsec/pkg/exprhelpers"
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"github.com/crowdsecurity/crowdsec/pkg/types"
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)
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type ConditionalOverflow struct {
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ConditionalFilter string
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ConditionalFilterRuntime *vm.Program
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DumbProcessor
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}
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func NewConditionalOverflow(g *BucketFactory) (*ConditionalOverflow, error) {
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var err error
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c := ConditionalOverflow{}
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c.ConditionalFilter = g.ConditionalOverflow
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c.ConditionalFilterRuntime, err = expr.Compile(c.ConditionalFilter, expr.Env(exprhelpers.GetExprEnv(map[string]interface{}{
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"queue": &Queue{}, "leaky": &Leaky{}})))
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if err != nil {
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g.logger.Errorf("Unable to compile condition expression for conditional bucket : %s", err)
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return nil, fmt.Errorf("unable to compile condition expression for conditional bucket : %v", err)
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}
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return &c, nil
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}
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func (c *ConditionalOverflow) AfterBucketPour(b *BucketFactory) func(types.Event, *Leaky) *types.Event {
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return func(msg types.Event, l *Leaky) *types.Event {
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var condition, ok bool
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if c.ConditionalFilterRuntime != nil {
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l.logger.Debugf("Running condition expression : %s", c.ConditionalFilter)
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ret, err := expr.Run(c.ConditionalFilterRuntime, exprhelpers.GetExprEnv(map[string]interface{}{"evt": &msg, "queue": l.Queue, "leaky": l}))
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if err != nil {
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l.logger.Errorf("unable to run conditional filter : %s", err)
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return &msg
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}
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l.logger.Debugf("Conditional bucket expression returned : %v", ret)
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if condition, ok = ret.(bool); !ok {
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l.logger.Warningf("overflow condition, unexpected non-bool return : %T", ret)
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return &msg
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}
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if condition {
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l.logger.Debugf("Conditional bucket overflow")
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l.Ovflw_ts = time.Now().UTC()
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l.Out <- l.Queue
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return nil
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}
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}
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return &msg
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}
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}
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