69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
// +build !nofilter
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package filtering
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import (
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"fmt"
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"os"
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"github.com/araddon/qlbridge/datasource"
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"github.com/araddon/qlbridge/expr"
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"github.com/araddon/qlbridge/value"
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"github.com/araddon/qlbridge/vm"
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)
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type ExprValue struct {
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node expr.Node
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expression string
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}
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func (e *ExprValue) String() string {
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if e.node != nil {
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return e.node.String()
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} else {
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return "<Empty Expression>"
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}
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}
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func (e *ExprValue) Set(value string) error {
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if value == "" {
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e.node = nil
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e.expression = value
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return nil
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}
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ast, err := expr.ParseExpression(value)
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if err != nil {
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return err
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}
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e.node = ast
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e.expression = value
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return nil
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}
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// Validate answers the question wether to include a log line or not.
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func (e *ExprValue) Validate(lineInput map[string]interface{}) bool {
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if e.node == nil {
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return true
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}
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line := translateMap(lineInput)
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context := datasource.NewContextSimpleNative(line)
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val, ok := vm.Eval(context, e.node)
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if !ok || val == nil { // errors when evaluating
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return false
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}
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if bv, isBool := val.(value.BoolValue); isBool {
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return bv.Val()
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}
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fmt.Fprintln(os.Stderr, "WARNING: The 'where' expression doesn't return a boolean")
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return false
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}
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func translateMap(lineInput map[string]interface{}) map[string]interface{} {
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lineOutput := make(map[string]interface{})
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lineOutput["prog"] = lineInput["app_name"]
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lineOutput["msg"] = lineInput["message"]
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lineOutput["facility"] = lineInput["facility"]
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lineOutput["host"] = lineInput["hostname"]
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lineOutput["time"] = lineInput["timestamp"]
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lineOutput["sev"] = lineInput["severity"]
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return lineOutput
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}
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