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1.0.0
New Relic's Open-Source Elixir Agent
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Files
lib/new_relic/harvest/collector/metric/harvester.ex
defmodule NewRelic.Harvest.Collector.Metric.Harvester do
use GenServer
@moduledoc false
alias NewRelic.Harvest
alias NewRelic.Harvest.Collector
alias NewRelic.Metric.MetricData
def start_link(_) do
GenServer.start_link(__MODULE__, [])
end
def init(_) do
{:ok,
%{
start_time: System.system_time(),
start_time_mono: System.monotonic_time(),
end_time_mono: nil,
metrics: %{}
}}
end
# API
def report_metric(identifier, values),
do:
Collector.Metric.HarvestCycle
|> Harvest.HarvestCycle.current_harvester()
|> GenServer.cast({:report, MetricData.transform(identifier, values)})
def gather_harvest,
do:
Collector.Metric.HarvestCycle
|> Harvest.HarvestCycle.current_harvester()
|> GenServer.call(:gather_harvest)
# Server
def handle_cast(_late_msg, :completed), do: {:noreply, :completed}
def handle_cast({:report, report_metrics}, state) do
metrics =
report_metrics
|> List.wrap()
|> Enum.reduce(state.metrics, fn %{name: name, scope: scope} = metric, acc ->
Map.update(acc, {name, scope}, metric, fn existing ->
NewRelic.Metric.merge(existing, metric)
end)
end)
{:noreply, %{state | metrics: metrics}}
end
def handle_call(_late_msg, _from, :completed), do: {:reply, :completed, :completed}
def handle_call(:send_harvest, _from, state) do
send_harvest(%{state | end_time_mono: System.monotonic_time()})
{:reply, :ok, :completed}
end
def handle_call(:gather_harvest, _from, state) do
{:reply, build_metric_data(state.metrics), state}
end
def send_harvest(state) do
metric_data = build_metric_data(state.metrics)
Collector.Protocol.metric_data([
Collector.AgentRun.agent_run_id(),
System.convert_time_unit(state.start_time, :native, :second),
System.convert_time_unit(
state.start_time + (state.end_time_mono - state.start_time_mono),
:native,
:second
),
metric_data
])
log_harvest(length(metric_data))
end
def log_harvest(harvest_size) do
NewRelic.report_metric({:supportability, "MetricData"}, harvest_size: harvest_size)
NewRelic.log(:debug, "Completed Metric harvest - size: #{harvest_size}")
end
defp build_metric_data(metrics) do
metrics
|> Map.values()
|> Enum.map(&encode/1)
end
def encode(%NewRelic.Metric{name: name, scope: scope} = m) do
[
%{name: to_string(name), scope: to_string(scope)},
[
m.call_count,
m.total_call_time,
m.total_exclusive_time,
m.min_call_time,
m.max_call_time,
m.sum_of_squares
]
]
end
end