fill-up-pouchdb-with-revisions.js

const sleep = (milliseconds) => new Promise((res) => setTimeout(() => res(true), milliseconds))

const fillUpWithRevisions = async (numberOfDocs = 100, numberOfRevisionsPerDoc = 10, templateDoc, compactCompare = true, autoCompact = false, destroy = true) => {
  let initialEstimate = await navigator.storage.estimate()
  let dbName = `test-${new Date().getTime()}`
  let db = new PouchDB(dbName, {auto_compaction: autoCompact})
  delete templateDoc._rev
  let docNumber = 0
  let revisionNumber = 0
  while (numberOfDocs > docNumber) {
    let doc = Object.assign({}, templateDoc, { _id: `${docNumber}` })
    await db.put(doc)
    while (revisionNumber < numberOfRevisionsPerDoc) {
      doc = await db.get(doc._id)
      doc.cacheBreak = revisionNumber
      await db.put(doc)
      revisionNumber++
    }
    revisionNumber = 0
    docNumber++
  }
  console.log('Concluding...')
  await sleep(10*1000)
  let concludingEstimate = await navigator.storage.estimate()
  if (compactCompare) {
    console.log('Compacting...')
    await db.compact()
    await db.compact()
    await sleep(10*1000)
    let compactedEstimate = await navigator.storage.estimate()
    console.log(`
      Initial Estimate: ${JSON.stringify(initialEstimate)}
      Concluding Estimate: ${JSON.stringify(concludingEstimate)}
      Compacted Estimate: ${JSON.stringify(compactedEstimate)}
      Usage Difference: ${concludingEstimate.usage - initialEstimate.usage} bytes
      Average Doc Size: ${(concludingEstimate.usage - initialEstimate.usage) / numberOfDocs} bytes
    `)
  } else {
    console.log(`
      Initial Estimate: ${JSON.stringify(initialEstimate)}
      Concluding Estimate: ${JSON.stringify(concludingEstimate)}
      Usage Difference: ${concludingEstimate.usage - initialEstimate.usage} bytes
      Average Doc Size: ${(concludingEstimate.usage - initialEstimate.usage) / numberOfDocs} bytes
    `)
  }
  if (destroy) await db.destroy()
}