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fix(master): ensure url_parser does not fail on missing txt record #261

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merged 4 commits into from
Dec 11, 2024
Merged

fix(master): ensure url_parser does not fail on missing txt record #261

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3062871
fix url parser to avid failing on missing txt record
alexkerezsini Dec 10, 2024
2450eec
Fix lookup value parsing
alexkerezsini Dec 10, 2024
9314707
Fix warning
alexkerezsini Dec 11, 2024
fa4b0b1
fix comments
alexkerezsini Dec 11, 2024
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22 changes: 20 additions & 2 deletions lib/mongo/url_parser.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -155,8 +155,8 @@ defmodule Mongo.UrlParser do
{:ok, {_, _, _, _, _, srv_record}} <-
:inet_res.getbyname(~c"_mongodb._tcp." ++ url_char, :srv),
{:ok, host} <- get_host_srv(srv_record),
{:ok, {_, _, _, _, _, txt_record}} <- :inet_res.getbyname(url_char, :txt),
txt <- "#{orig_options}&#{txt_record}&ssl=true" do
{:ok, txt_record} <- resolve_txt_record(url_char),
txt <- build_params(orig_options, txt_record) do
frags
|> Map.put("seeds", host)
|> Map.put("options", txt)
Expand All @@ -167,6 +167,24 @@ defmodule Mongo.UrlParser do

defp resolve_srv_url(frags), do: frags

defp build_params(orig_options, nil) do
"#{orig_options}&ssl=true"
end

defp build_params(orig_options, txt_record) do
"#{orig_options}&#{txt_record}&ssl=true"
end

defp resolve_txt_record(url_char) do
case :inet_res.lookup(url_char, :in, :txt) do
[[txt_record] | _] ->
{:ok, txt_record}

_other ->
{:ok, nil}
end
end

@spec get_host_srv([{term, term, term, term}]) :: {:ok, String.t()}
defp get_host_srv(srv) when is_list(srv) do
hosts = Enum.map_join(srv, ",", fn {_, _, port, host} -> "#{host}:#{port}" end)
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