59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package templating
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import (
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"strings"
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)
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// matcher determines which template should be applied to a given metric
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// based on a filter tree.
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type matcher struct {
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root *node
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defaultTemplate *Template
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}
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// newMatcher creates a new matcher.
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func newMatcher(defaultTemplate *Template) *matcher {
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return &matcher{
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root: &node{},
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defaultTemplate: defaultTemplate,
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}
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}
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func (m *matcher) addSpec(tmplt templateSpec) error {
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// Parse out the default tags specific to this template
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tags := map[string]string{}
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if tmplt.tagstring != "" {
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for _, kv := range strings.Split(tmplt.tagstring, ",") {
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parts := strings.Split(kv, "=")
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tags[parts[0]] = parts[1]
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}
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}
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tmpl, err := NewTemplate(tmplt.separator, tmplt.template, tags)
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if err != nil {
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return err
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}
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m.add(tmplt.filter, tmpl)
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return nil
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}
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// add inserts the template in the filter tree based the given filter
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func (m *matcher) add(filter string, template *Template) {
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if filter == "" {
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m.defaultTemplate = template
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m.root.separator = template.separator
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return
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}
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m.root.insert(filter, template)
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}
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// match returns the template that matches the given measurement line.
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// If no template matches, the default template is returned.
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func (m *matcher) match(line string) *Template {
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tmpl := m.root.search(line)
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if tmpl != nil {
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return tmpl
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}
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return m.defaultTemplate
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}
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