// Generate calls all the service generators associated with this plugin and
// consolidates their output.
//
// Any conflicts in the generated files will result in a failure.
func (msg MultiServiceGenerator) Generate(req *api.GenerateServiceRequest) (*api.GenerateServiceResponse, error) {
var (
lock sync.Mutex
files = make(map[string][]byte)
usedPaths = make(map[string]string) // path -> plugin name
)
err := concurrent.Range(msg, func(_ int, sg ServiceGenerator) error {
res, err := sg.Generate(req)
if err != nil {
return err
}
lock.Lock()
defer lock.Unlock()
pluginName := sg.Handle().Name()
for path, contents := range res.Files {
if takenBy, taken := usedPaths[path]; taken {
return fmt.Errorf("plugin conflict: cannot write file %q for plugin %q: "+
"plugin %q already wrote to that file", path, pluginName, takenBy)
}
usedPaths[path] = pluginName
files[path] = contents
}
return nil
})
return &api.GenerateServiceResponse{Files: files}, err
}
// Handle gets a MultiHandle to all the plugins in this list or nil if the
// list is empty.
//
// The returned handle MUST be closed by the caller if error was nil.
func (fs Flags) Handle() (MultiHandle, error) {
var (
lock sync.Mutex
multi MultiHandle
)
err := concurrent.Range(fs, func(_ int, f Flag) error {
h, err := f.Handle()
if err != nil {
return err
}
lock.Lock()
defer lock.Unlock()
multi = append(multi, h)
return nil
})
if err == nil {
return multi, nil
}
return nil, internal.CombineErrors(err, multi.Close())
}
// Close closes all Handles associated with this MultiHandle.
func (mh MultiHandle) Close() error {
return concurrent.Range(mh, func(_ int, h Handle) error {
return h.Close()
})
}