You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: cachegenerator.go
    path of file: ./repos/aether-app/aether-core/aether/backend/responsegenerator
    
    the code of the file until where you have to start completion: // Backend > ResponseGenerator > CacheGenerator
// This file provides a set of functions that relate to the generation of pregenerated caches in certain intervals.

package responsegenerator

import (
	// "fmt"
	"aether-core/aether/io/api"
	"aether-core/aether/io/persistence"
	// "aether-core/aether/services/configstore"
	"aether-core/aether/backend/feapiconsumer"
	"aether-core/aether/services/extverify"
	"aether-core/aether/services/globals"
	"aether-core/aether/services/logging"
	"aether-core/aether/services/randomhashgen"
	"aether-core/aether/services/toolbox"
	"encoding/json"
	"errors"
	"fmt"
	// "github.com/davecgh/go-spew/spew"
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	// "strings"
	"time"
)

// CacheResponse is the internal procesing structure for generating caches to be saved to the disk.
type CacheResponse struct {
	cacheName     string
	start         api.Timestamp
	end           api.Timestamp
	entityPages   *[]api.Response
	indexPages    *[]api.Response
	manifestPages *[]api.Response
	counts        *[]api.EntityCount
}

// GatherCacheData responds to a cache generation request. This returns an Api.Response entity with entities, entity indexes, and the cache link that needs to be inserted into the index of the endpoint.
// T
    
func CreateNewCache(etype string, start api.Timestamp, end api.Timestamp, allPriorCachesGeneratedSoFarAreEmpty bool) (bool, error) {
	// - Pull the data from the DB
	// - Look at the cache folder. If there is a cache folder and an index there, save the cache and add to index.
	// - If there is no cache present there, create the index and add it as the first entry.
	// fmt.Printf("CreateNewCache was asked to generate a cache for the resp type %#v that ended at the timestamp: %#v\n", etype, end)
	cacheData, err := GatherCacheData(etype, start, end)
	if err != nil {
		return false, errors.New(fmt.Sprintf("Cache creation process encountered an error. Error: %s", err))
	}
	// if (*cacheData.entityPages)[0].Empty() && allPriorCachesGeneratedSoFarAreEmpty {
	// 	// fmt.Printf("This cache and all prior caches generated so far were empty, skipping generation of this cache. Entity type: %s, Start: %d, End: %d\n", etype, start, end)
	// 	return true, nil
	// }
	/*
		^ This is an optimisation that we should do eventually, but for now, it's easier to reason about when they don't actually prevent generation.
	*/
	ePagesApiresp := convertResponsesToApiResponses(cacheData.entityPages)
	iPagesApiresp := convertResponsesToApiResponses(cacheData.indexPages)
	mPagesApiresp := convertResponsesToApiResponses(cacheData.manifestPages)
	startAsString := strconv.FormatInt(int64(cacheData.start), 10)
	endAsString := strconv.FormatInt(int64(cacheData.end), 10)
	filter := api.Filter{Type: "timestamp", Values: []string{startAsString, endAsString}}
	generateContainer(ePagesApiresp, iPagesApiresp, mPagesApiresp, cacheData.counts, &[]api.Filter{filter}, cacheData.cacheName, false, etype, api.Timestamp(cacheData.start))
	// Generate endpoint index.
	epd, err := generateEndpointDir(etype)
	if err != nil {
		return false, err
	}
	toolbox.CreatePath(epd)
	var endpointIndex api.ApiResponse
	// Look for the index.json in it. If it doesn't exist, create.
	// Heads up: we're reading and parsing our own caches.
	endpointIndexAsJson, err3 := ioutil.ReadFile(filepath.Join(epd, "index.json"))
	if IsFileNotFoundError(err3) {
		toolbox.ResetPath(epd)
		/*
			^ We reset (delete + recreate) the path. This is useful because the cache index being not present does not mean the folder is empty. If there is a bug that prevents index.json from being generated, the cache index can grow indefinitely because the assumption that index.json not present == endpoint index empty will make it so that you generate a whole new set of network head caches every time the iteration runs. Not great! Having this reset here makes it so that if the index.json is present and we enter unbounded probability space, we delete the folder and reset the whole thing, so that it returns to a known state.
		*/

		// The index.json of this cache likely doesn't exist. Create one.
		endpointIndex.Prefill()
		endpointIndex.Entity = etype
		endpointIndex.Endpoint = etype
	} else if err3 != nil {
		// The index is corrupted. The user knowingly modified it or filesystem did, or some other process did.
		//FUTURE: We should regenerate this cache, maybe. But if the user (or a process running as user) modified this cache, we have no guarantee that it will not do that again in the future, so regenerating it might just be a waste of resources.
		logging.Logf(1, "Cache creation process encountered an error. Error: %s", err3)
		return false, errors.New(fmt.Sprintf("Cache creation process encountered an error. Error: %s", err3))
	} else {
		// err3 is nil
		json.Unmarshal(endpointIndexAsJson, &endpointIndex)
	}
	// If the file exists, go through with regular processing.
	updateEndpointIndex(&endpointIndex, &cacheData)
	deleteTooOldCaches(etype, &endpointIndex)
	signingErr := endpointIndex.CreateSignature(globals.BackendConfig.GetBackendKeyPair())
	if signingErr != nil {
		return false, errors.New(fmt.Sprintf("This entity index failed to be page-signed. Error: %#v Page: %#v\n", signingErr, endpointIndex))
	}
	json, err4 := endpointIndex.ToJSON()
	if err4 != nil {
		return false, err
	}
	saveFileToDisk(json, epd, "index.json")
	return false, nil
}