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package discovery
// PluginCache is an interface implemented by objects that are able to maintain
// a cache of plugins.
type PluginCache interface {
// CachedPluginPath returns a path where the requested plugin is already
// cached, or an empty string if the requested plugin is not yet cached.
CachedPluginPath(kind string, name string, version Version) string
// InstallDir returns the directory that new plugins should be installed into
// in order to populate the cache. This directory should be used as the
// first argument to getter.Get when downloading plugins with go-getter.
//
// After installing into this directory, use CachedPluginPath to obtain the
// path where the plugin was installed.
InstallDir() string
}
// NewLocalPluginCache returns a PluginCache that caches plugins in a
// given local directory.
func NewLocalPluginCache(dir string) PluginCache {
return &pluginCache{
Dir: dir,
}
}
type pluginCache struct {
Dir string
}
func (c *pluginCache) CachedPluginPath(kind string, name string, version Version) string {
allPlugins := FindPlugins(kind, []string{c.Dir})
plugins := allPlugins.WithName(name).WithVersion(version)
if plugins.Count() == 0 {
// nothing cached
return ""
}
// There should generally be only one plugin here; if there's more than
// one match for some reason then we'll just choose one arbitrarily.
plugin := plugins.Newest()
return plugin.Path
}
func (c *pluginCache) InstallDir() string {
return c.Dir
}
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