function next (err, doc) {
if(err) return cb(err)
//read a singe value from the stream.
pull(
chooser(doc, vrange, opts),
pull.find(Boolean, cb)
)
}
paramap(function (user, cb) {
pull(
sbot.createHistoryStream({id: user.id, limit: 1}),
pull.find(null, function (err, msg) {
if (err) throw err
user.first = msg.value.timestamp
user.lifespan = user.last - user.first
cb(null, user)
})
)
}),
paramap(function (data, cb) {
// DONT use this, because our .first will be using the msg's declared timestamp, and this is the msg's local receive time
// if(data.ts) return cb(null, { id: data.id, last: data.ts })
// handle some legacy: older users may not have .ts included in latest()
pull(
sbot.createHistoryStream({id: data.id, sequence: data.sequence - 1}),
pull.find(null, function (err, msg) {
if (err) throw err
if (msg == null) return cb(null)
cb(null, { id: data.id, last: msg.value.timestamp })
})
)
}),
function first(stream, cb) {
pull(stream, pull.find(cb))
}