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index.js
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index.js
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var through = require('through2')
var fs = require('fs')
var concat = require('concat-stream')
var n = 0
function prepare (giffer, limit) {
n = 0
var ops = []
giffer.seqDb.createReadStream()
.on('data', function (kv) {
if (++n <= limit) return
ops.push({ type: 'del', key: kv.value })
})
.on('end', function () {
if (ops.length === 0) return
n = n - ops.length
giffer.urlDb.batch(ops, function (err) {
if (err) throw err
})
})
}
module.exports = function (giffer, opts) {
prepare(giffer, opts.limit)
giffer.pre('download', function(next) {
if (++n <= opts.limit) return next()
giffer.seqDb.createReadStream({
limit: 1,
gt: 1,
reverse: false
})
.on('data', function (kv) {
--n
giffer.urlDb.get(kv.value, function (err, o) {
if (err) throw new Error('There was an error deleting an old GIF')
// fs.unlink(giffer.outDir + '/' + o.filename, noop)
giffer.urlDb.del(kv.value, noop)
})
})
next()
})
}
function noop () {}