An idiomatic library for connecting an Elixir project to a Jylis CRDT database.
Jylis is a distributed in-memory database for Conflict-free Replicated Data Types (CRDTs), built for speed, scalability, availability, and ease of use.
Add the :jylis_ex dependency to your mix.exs file:
defp deps() do
[{:jylis_ex, ">= 0.0.0"}]
endRun mix deps.get to get the new dependency.
The connection URI must be specified in the format: schema://host:port, where
the schema is jylis. The host can be a host name, IP address, or domain name
of the database host to connect to. The port is optional and defaults to
6379 unless otherwise specified.
{:ok, connection} = Jylis.start_link("jylis://host:port")This library aims to be idiomatic with both Elixir and Jylis. Therefore, the syntax of the queries closely match the Jylis documentation and ideally it should feel natural to you, an Elixir programmer.
For example, take the case of a Jylis query to set a value for a
UJSON key:
UJSON SET fruit apple '{"color": "red", "ripe": true}'
Using this library, the query looks like this:
connection |> Jylis.UJSON.set(["fruit", "apple"], %{color: "red", ripe: true})The format for a query is:
Jylis.<data_type>.<function>(key(s), value?, timestamp?)
However, be sure to consult the API documentation or the Jylis documentation for the exact format of your particular query.
Timestamped Register [link]
{:ok, _} = connection |> Jylis.TREG.set("lamp_brightness", 80, 1528082143)
{:ok, result} = connection |> Jylis.TREG.get("lamp_brightness")
# {:ok, {"80", 1528082143}}Timestamped Log [link]
{:ok, _} = connection |> Jylis.TLOG.ins("temperature", 68.8, 1528082150)
{:ok, _} = connection |> Jylis.TLOG.ins("temperature", 70.1, 1528082160)
{:ok, _} = connection |> Jylis.TLOG.ins("temperature", 73.6, 1528082170)
{:ok, size} = connection |> Jylis.TLOG.size("temperature")
# {:ok, 3}
{:ok, items} = connection |> Jylis.TLOG.get("temperature")
# {:ok, [{"73.6", 1528082170}, {"70.1", 1528082160}, {"68.8", 1528082150}]}
{:ok, _} = connection |> Jylis.TLOG.trim("temperature", 1)
{:ok, items} = connection |> Jylis.TLOG.get("temperature")
# {:ok, [{"73.6", 1528082170}]}
{:ok, _} = connection |> Jylis.TLOG.cutoff("temperature")
# {:ok, 1528082170}Grow-Only Counter [link]
{:ok, _} = connection |> Jylis.GCOUNT.inc("mileage", 10)
{:ok, _} = connection |> Jylis.GCOUNT.inc("mileage", 5)
{:ok, value} = connection |> Jylis.GCOUNT.get("mileage")
# {:ok, 15}Positive/Negative Counter [link]
{:ok, _} = connection |> Jylis.PNCOUNT.inc("subscribers", 3)
{:ok, _} = connection |> Jylis.PNCOUNT.dec("subscribers", 1)
{:ok, value} = connection |> Jylis.PNCOUNT.get("subscribers")
# {:ok, 2}Multi-Value Register [link]
{:ok, _} = connection |> Jylis.MVREG.set("thermostat", 68)
{:ok, value} = connection |> Jylis.MVREG.get("thermostat")
# {:ok, ["68"]}Unordered JSON [link]
{:ok, _} = connection |> Jylis.UJSON.set(["users", "alice"], %{admin: false})
{:ok, _} = connection |> Jylis.UJSON.set(["users", "brett"], %{admin: false})
{:ok, _} = connection |> Jylis.UJSON.set(["users", "carol"], %{admin: true})
{:ok, users} = connection |> Jylis.UJSON.get("users")
# {:ok,
# %{
# "alice" => %{"admin" => false},
# "brett" => %{"admin" => false},
# "carol" => %{"admin" => true}
# }}
{:ok, _} = connection |> Jylis.UJSON.ins(["users", "brett", "banned"], true)
{:ok, _} = connection |> Jylis.UJSON.clr(["users", "alice"])
{:ok, users} = connection |> Jylis.UJSON.get("users")
# {:ok,
# %{
# "brett" => %{"admin" => false, "banned" => true},
# "carol" => %{"admin" => true}
# }}If this library doesn't contain a function for the query you would like to
perform, you can construct the query yourself by calling Jylis.query.
However, be aware that this function is non-idiomatic and may require you to
do your own pre/post processing on the data.
{:ok, _} = connection |> Jylis.query(["TLOG", "INS", "temperature", 72.6, 5])
# {:ok, "OK"}
{:ok, value} = connection |> Jylis.query(["TLOG", "GET", "temperature"])
# {:ok, [["73.6", 1528082170]]}In addition to supporting integer timestamps as defined by the Jylis spec, this
library also has helpers to convert the Jylis Timestamped data types to/from
ISO 8601. Functions that have a timestamp parameter will automatically convert
an ISO 8601 string to a Unix timestamp.
{:ok, _} = connection |> Jylis.TREG.set("volume", 64, "2018-06-06T01:42:57Z")
{:ok, result} = connection |> Jylis.TREG.get("volume")
# {:ok, {"64", 1528249377}}
result |> Jylis.Result.to_iso8601
# {"64", "2018-06-06T01:42:57Z"}
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