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package vaku
import (
// folderWriteWorkerInput takes input/output channels for input to the job
type folderWriteWorkerInput struct {
inputsC <-chan *writeInput
resultsC chan<- error
type writeInput struct {
path *PathInput
data map[string]interface{}
// FolderWrite takes in a map of paths to data that should be written to that path. Users may
// find this function difficult to call on its own because the input can be large and specific,
// however the output of FolderRead matches the input of FolderWrite(), making them easy to use
// together. Note that mount/version information is determined only once using a random path in
// the map and cached for all future writes. Therefore this function cannot write to two mounts of
// different versions in the same call.
func (c *Client) FolderWrite(d map[string]map[string]interface{}) error {
var err error
var basePathInfo *PathInput
// Get mount data based on a random path in the map
for p := range d {
basePathInfo = NewPathInput(p)
basePathInfo.opType = "write"
err = c.InitPathInput(basePathInfo)
if err != nil {
return fmt.Errorf("failed to init path %s: %w", basePathInfo.Path, err)
// Concurrency channels for workers
inputsC := make(chan *writeInput, len(d))
resultsC := make(chan error, len(d))
// Spawn workers equal to MaxConcurrency
for w := 1; w <= MaxConcurrency; w++ {
go c.folderWriteWorker(&folderWriteWorkerInput{
inputsC: inputsC,
resultsC: resultsC,
// Add all path/data parts to write to the inputs channel
for k, v := range d {
inputsC <- &writeInput{
path: &PathInput{
Path: k,
mountPath: basePathInfo.mountPath,
mountlessPath: basePathInfo.mountlessPath,
mountVersion: basePathInfo.mountVersion,
data: v,
// Empty the results channel into output
for j := 0; j < len(d); j++ {
o := <-resultsC
if o != nil {
err = fmt.Errorf("failed to write path: %w", o)
return err
func (c *Client) folderWriteWorker(i *folderWriteWorkerInput) {
var err error
for {
id, more := <-i.inputsC
if more {
err = c.PathWrite(id.path,
if err != nil {
i.resultsC <- fmt.Errorf("failed to write path %s: %w", id.path.Path, err)
i.resultsC <- nil
} else {
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