Encoding series to a string

[D4no0]

It is possible currently to take a Instream.Series implementation and encode it to string?

The use-case is to send metrics from server to a metrics poller. Meaning that the poller will actually insert the data in database and all I have to do is send series encoded as string.

[mneudert]

That conversion is definitely possible.

Depending on the string format you need you should receive something usable by taking the following steps (both last v1.0.0 release and current development version):

# create/query your point with values
point = %MySeries{}

# convert it to a plain map
data = %{
  measurement: MySeries.__meta__(:measurement),
  fields: Map.from_struct(point.fields),
  tags: Map.from_struct(point.tags),
  timestamp: timestamp
}

# convert it to InfluxDB line format
line = Instream.Encoder.Line.encode(data)

I will update the line format encoder to not require the conversion to plain maps and have public documentation.

Untested but if you want to generate a JSON string the following could work if you are using :jason:

defimpl Jason.Encoder, for: MySeries do
  def encode(point, opts) do
    Jason.Encode.map(
      %{
        measurement: MySeries.__meta__(:measurement),
        fields: Map.from_struct(point.fields),
        tags: Map.from_struct(point.tags),
        timestamp: timestamp
      },
      opts
    )
  end
end