Function GetExtensionFunction

core/extensions/extensions.go:88–120

GetExtensionFunction returns the function inside the extension matching the given names. Returns an error if the extension or function cannot be found.

(identifier LibraryIdentifier, funcName string)

// GetExtensionFunction returns the function inside the extension matching the given names. Returns an error if the
// extension or function cannot be found.
func GetExtensionFunction(identifier LibraryIdentifier, funcName string) (_ pg_extension.Function, err error) {
	libMutex.Lock()
	defer libMutex.Unlock()

	extName := identifier.ExtensionName()
	if identifier.Platform() != pg_extension.PLATFORM {
		return pg_extension.Function{}, errors.Errorf(
			`function "%s" was initialized through "%s" on a different platform, which is not supported`, funcName, extName)
	}
	lib, ok := allLibraries[extName]
	if !ok {
		ext, err := GetExtension(extName)
		if err != nil {
			return pg_extension.Function{}, err
		}
		lib, err = ext.LoadLibrary()
		if err != nil {
			return pg_extension.Function{}, err
		}
		lib.Version = ext.Control.DefaultVersion
		allLibraries[extName] = lib
	}
	if lib.Version != identifier.Version() {
		return pg_extension.Function{}, errors.Errorf(
			`function "%s" was initialized through "%s" v%s, the current platform only supports v%s"`,
			funcName, extName, identifier.Version().String(), lib.Version.String())
	}
	libFunc, ok := lib.Funcs[funcName]
	if !ok {
		return pg_extension.Function{}, errors.Errorf(`extension "%s" does not declare the function "%s"`, extName, funcName)
	}
	return libFunc, nil
}

// FindInvalidIdentifiers returns all identifiers that are not valid for the current environment. If the return is
// empty, then that means all of the given identifiers are valid.