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| 1 | +defmodule Sentry.Telemetry.SpanProcessor do |
| 2 | + @behaviour :otel_span_processor |
| 3 | + |
| 4 | + require Record |
| 5 | + |
| 6 | + @fields Record.extract(:span, from: "deps/opentelemetry/include/otel_span.hrl") |
| 7 | + Record.defrecordp(:span, @fields) |
| 8 | + |
| 9 | + alias Sentry.{Span, Transaction} |
| 10 | + |
| 11 | + defmodule SpanStorage do |
| 12 | + use GenServer |
| 13 | + |
| 14 | + def start_link(_opts) do |
| 15 | + GenServer.start_link(__MODULE__, nil, name: __MODULE__) |
| 16 | + end |
| 17 | + |
| 18 | + def init(_) do |
| 19 | + {:ok, %{root_spans: %{}, child_spans: %{}}} |
| 20 | + end |
| 21 | + |
| 22 | + def store_span(span_data) do |
| 23 | + GenServer.call(__MODULE__, {:store_span, span_data}) |
| 24 | + end |
| 25 | + |
| 26 | + def get_root_span(span_id) do |
| 27 | + GenServer.call(__MODULE__, {:get_root_span, span_id}) |
| 28 | + end |
| 29 | + |
| 30 | + def get_child_spans(parent_span_id) do |
| 31 | + GenServer.call(__MODULE__, {:get_child_spans, parent_span_id}) |
| 32 | + end |
| 33 | + |
| 34 | + def update_span(span_data) do |
| 35 | + GenServer.call(__MODULE__, {:update_span, span_data}) |
| 36 | + end |
| 37 | + |
| 38 | + def handle_call({:store_span, span_data}, _from, state) do |
| 39 | + if span_data[:parent_span_id] == :undefined do |
| 40 | + new_state = put_in(state, [:root_spans, span_data[:span_id]], span_data) |
| 41 | + {:reply, :ok, new_state} |
| 42 | + else |
| 43 | + new_state = |
| 44 | + update_in(state, [:child_spans, span_data[:parent_span_id]], fn spans -> |
| 45 | + (spans || []) ++ [span_data] |
| 46 | + end) |
| 47 | + |
| 48 | + {:reply, :ok, new_state} |
| 49 | + end |
| 50 | + end |
| 51 | + |
| 52 | + def handle_call({:get_root_span, span_id}, _from, state) do |
| 53 | + {:reply, state.root_spans[span_id], state} |
| 54 | + end |
| 55 | + |
| 56 | + def handle_call({:get_child_spans, parent_span_id}, _from, state) do |
| 57 | + {:reply, state.child_spans[parent_span_id] || [], state} |
| 58 | + end |
| 59 | + |
| 60 | + def handle_call({:update_span, span_data}, _from, state) do |
| 61 | + if span_data[:parent_span_id] == :undefined do |
| 62 | + new_state = put_in(state, [:root_spans, span_data[:span_id]], span_data) |
| 63 | + {:reply, :ok, new_state} |
| 64 | + else |
| 65 | + new_state = |
| 66 | + update_in(state, [:child_spans, span_data[:parent_span_id]], fn spans -> |
| 67 | + Enum.map(spans || [], fn span -> |
| 68 | + if span[:span_id] == span_data[:span_id], do: span_data, else: span |
| 69 | + end) |
| 70 | + end) |
| 71 | + |
| 72 | + {:reply, :ok, new_state} |
| 73 | + end |
| 74 | + end |
| 75 | + end |
| 76 | + |
| 77 | + @impl true |
| 78 | + def on_start(_ctx, otel_span, _config) do |
| 79 | + span_record = span(otel_span) |
| 80 | + |
| 81 | + SpanStorage.store_span(span_record) |
| 82 | + |
| 83 | + otel_span |
| 84 | + end |
| 85 | + |
| 86 | + @impl true |
| 87 | + def on_end(otel_span, _config) do |
| 88 | + span_record = span(otel_span) |
| 89 | + |
| 90 | + SpanStorage.update_span(span_record) |
| 91 | + |
| 92 | + if span_record[:parent_span_id] == :undefined do |
| 93 | + root_span = SpanStorage.get_root_span(span_record[:span_id]) |
| 94 | + child_spans = SpanStorage.get_child_spans(span_record[:span_id]) |
| 95 | + |
| 96 | + transaction = transaction_from_root_span(root_span, child_spans) |
| 97 | + Sentry.send_transaction(transaction) |
| 98 | + end |
| 99 | + |
| 100 | + :ok |
| 101 | + end |
| 102 | + |
| 103 | + @impl true |
| 104 | + def force_flush(_config) do |
| 105 | + :ok |
| 106 | + end |
| 107 | + |
| 108 | + defp transaction_from_root_span(root_span, child_spans) do |
| 109 | + trace_id = cast_trace_id(root_span[:trace_id]) |
| 110 | + |
| 111 | + Transaction.new(%{ |
| 112 | + transaction: root_span[:name], |
| 113 | + start_timestamp: cast_timestamp(root_span[:start_time]), |
| 114 | + timestamp: cast_timestamp(root_span[:end_time]), |
| 115 | + transaction_info: %{ |
| 116 | + source: "route" |
| 117 | + }, |
| 118 | + contexts: %{ |
| 119 | + trace: %{ |
| 120 | + op: root_span[:name], |
| 121 | + trace_id: trace_id, |
| 122 | + span_id: to_string(root_span[:span_id]), |
| 123 | + parent_span_id: nil |
| 124 | + } |
| 125 | + }, |
| 126 | + spans: Enum.map([root_span | child_spans], &span_from_record(&1, trace_id)) |
| 127 | + }) |
| 128 | + end |
| 129 | + |
| 130 | + defp span_from_record(span_record, trace_id) do |
| 131 | + %Span{ |
| 132 | + op: span_record[:name] || "unknown", |
| 133 | + start_timestamp: cast_timestamp(span_record[:start_time]), |
| 134 | + timestamp: cast_timestamp(span_record[:end_time]), |
| 135 | + trace_id: trace_id, |
| 136 | + span_id: to_string(span_record[:span_id] || ""), |
| 137 | + parent_span_id: cast_parent_span_id(span_record[:parent_span_id]) |
| 138 | + } |
| 139 | + end |
| 140 | + |
| 141 | + defp cast_trace_id(trace_id) do |
| 142 | + :crypto.hash(:md5, to_string(trace_id)) |
| 143 | + |> Base.encode16(case: :lower) |
| 144 | + end |
| 145 | + |
| 146 | + defp cast_parent_span_id(:undefined), do: nil |
| 147 | + defp cast_parent_span_id(nil), do: nil |
| 148 | + defp cast_parent_span_id(parent_span_id), do: to_string(parent_span_id) |
| 149 | + |
| 150 | + defp cast_timestamp(:undefined), do: nil |
| 151 | + defp cast_timestamp(nil), do: nil |
| 152 | + |
| 153 | + defp cast_timestamp(timestamp) do |
| 154 | + nano_timestamp = :opentelemetry.timestamp_to_nano(timestamp) |
| 155 | + {:ok, datetime} = DateTime.from_unix(div(nano_timestamp, 1_000_000), :millisecond) |
| 156 | + |
| 157 | + DateTime.to_iso8601(datetime) |
| 158 | + end |
| 159 | +end |
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