db.messagesByType = function (opts) {
if(!opts)
throw new Error('must provide {type: string} to messagesByType')
if(isString(opts))
opts = {type: opts}
opts = stdopts(opts)
var _keys = opts.keys
var _values = opts.values
ltgt.toLtgt(opts, opts, function (value) {
return ['type', opts.type, value]
}, LO, HI)
opts.values = true
return pull(
pl.read(indexDB, opts),
paramap(function (data, cb) {
var id = _keys ? data.value : data
db.get(id, function (err, msg) {
var ts = opts.keys ? data.key[2] : undefined
cb(null, msgFmt(_keys, _values, {key: id, ts: ts, value: msg}))
})
}),
pull.filter()
)
}
read: function (opts) {
opts = ltgt.toLtgt(opts, opts, function (value, isUpper) {
var bound = isUpper ? HI : LO
return [path, value, bound]
})
return pull(
pl.read(db.sublevel('idx'), opts),
pull.map(function (e) {
return e[2]
})
)
},
index.createUserStream = function (streamOpts) {
const opts = u.options(streamOpts)
// mutates opts
ltgt.toLtgt(opts, opts, function (value) {
return [opts.id, value]
}, u.lo, u.hi)
var keys = opts.keys !== false
var values = opts.values !== false
opts.keys = false
opts.values = true
return pull(index.read(opts), u.Format(keys, values, opts.private))
}
db.createUserStream = function (opts) {
opts = stdopts(opts)
ltgt.toLtgt(opts, opts, function (value) {
return [opts.id, value]
}, LO, HI)
var _keys = opts.keys
var _values = opts.values
opts.keys = false
opts.values = true
return pull(
pl.read(clockDB, opts),
lookup(_keys, _values)
)
}
db.createFeedStream = function (opts) {
opts = stdopts(opts)
ltgt.toLtgt(opts, opts, function (value) {
return [value, LO]
}, LO, HI)
var _keys = opts.keys
var _values = opts.values
opts.keys = false
opts.values = true
return pull(
pl.read(feedDB, opts),
lookup(_keys, _values)
)
}
iterator: function (_opts, cb) {
var opts = clone(_opts || {})
var prefix = _opts.prefix || []
function encodeKey(key) {
return encodePrefix(prefix, key, opts, {})
}
ltgt.toLtgt(_opts, opts, encodeKey, precodec.lowerBound, precodec.upperBound)
// if these legacy values are in the options, remove them
opts.prefix = null
//************************************************
//hard coded defaults, for now...
//TODO: pull defaults and encoding out of levelup.
opts.keyAsBuffer = opts.valueAsBuffer = false
//************************************************
//this is vital, otherwise limit: undefined will
//create an empty stream.
if ('number' !== typeof opts.limit)
opts.limit = -1
opts.keyAsBuffer = precodec.buffer
opts.valueAsBuffer = codec.isValueAsBuffer(opts)
function wrapIterator (iterator) {
return {
next: function (cb) {
return iterator.next(cb)
},
end: function (cb) {
iterator.end(cb)
}
}
}
if(ready)
return wrapIterator((db.db || db).iterator(opts))
else
waiting.push(function () {
cb(null, wrapIterator((db.db || db).iterator(opts)))
})
}
emitter.query = function (opts) {
var name = opts && opts.name
var period = opts && opts.period
if(!name)
throw new Error('must provide period')
if(!~tp.periods.indexOf(period))
throw new Error('period must be one of:' + JSON.stringify(tp.periods))
function map (key) {
return [name, period, toTimestamp(key)]
}
opts = ltgt.toLtgt(opts, opts, map, 0, MAX)
return pl.read(db, opts)
}
index.messagesByType = function (opts) {
if (!opts) { throw new Error('must provide {type: string} to messagesByType') }
if (isString(opts)) { opts = { type: opts } }
opts = u.options(opts)
var keys = opts.keys !== false
var values = opts.values !== false
opts.values = true
ltgt.toLtgt(opts, opts, function (value) {
return ['type', opts.type, value]
}, u.lo, u.hi)
return pull(
index.read(opts),
Format(keys, values, opts.private)
)
}
db.messagesByType = function (opts) {
if(!opts)
throw new Error('must provide {type: string} to messagesByType')
if(isString(opts))
opts = {type: opts}
ltgt.toLtgt(opts, opts, function (value) {
return ['type', opts.type, value]
}, LO, HI)
//default keys to false
var keys = opts.keys = opts.keys === true
return pull(
pl.read(indexDB, opts),
paramap(function (data, cb) {
var id = keys ? data.value : data
db.get(id, function (err, msg) {
cb(null, keys ? {key: id, ts: data.key[2], value: msg} : msg)
})
}),
pull.filter()
)
}