97 lines
2.0 KiB
Go
97 lines
2.0 KiB
Go
package checker
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import (
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"fmt"
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"plugin"
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"strings"
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)
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// CreateRegistry creates an empty type registry
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// if TRUE is given, it will use default Types
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// see ./default/ folder
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func CreateRegistry(useDefaultTypes bool) *TypeRegistry {
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return &TypeRegistry{
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Types: make([]Type, 0),
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}
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}
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// Add adds a type to the registry; it must be a
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// valid and existing plugin name without the .so extension
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func (tr *TypeRegistry) Add(pluginName string) error {
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/* (1) Check plugin name */
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if len(pluginName) < 1 {
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return fmt.Errorf("Plugin name must not be empty")
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}
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/* (2) Check plugin extension */
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if strings.HasSuffix(pluginName, ".so") {
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return fmt.Errorf("Plugin name must be provided without extension: '%s'", pluginName[0:len(pluginName)-3])
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}
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/* (3) Try to load the plugin */
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p, err := plugin.Open(fmt.Sprintf("%s.so", pluginName))
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if err != nil {
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return err
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}
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/* (4) Export wanted properties */
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matcher, err := p.Lookup("Match")
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if err != nil {
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return fmt.Errorf("Missing method 'Match()'; %s", err)
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}
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checker, err := p.Lookup("Check")
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if err != nil {
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return fmt.Errorf("Missing method 'Check()'; %s", err)
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}
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/* (5) Cast Match+Check */
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matcherCast, ok := matcher.(func(string) bool)
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if !ok {
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return fmt.Errorf("Match() is malformed")
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}
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checkerCast, ok := checker.(func(interface{}) bool)
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if !ok {
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return fmt.Errorf("Check() is malformed")
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}
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/* (6) Add type to registry */
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tr.Types = append(tr.Types, Type{
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Match: matcherCast,
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Check: checkerCast,
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})
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return nil
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}
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// Checks the 'value' which must be of type 'name'
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func (tr TypeRegistry) Run(name string, value interface{}) error {
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var T *Type = nil
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/* (1) Iterate to find matching type (take first) */
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for _, t := range tr.Types {
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// stop if found
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if t.Match(name) {
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T = &t
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break
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}
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}
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/* (2) Abort if no matching type */
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if T == nil {
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return fmt.Errorf("No matching type")
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}
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/* (3) Check */
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if !T.Check(value) {
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return fmt.Errorf("Does not match")
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}
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return nil
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}
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