lnd postStart: poll for REST service availability

Improves service startup time compared to just sleeping
2019-11-27 14:04:41 +01:00 · 2019-11-27 14:04:41 +01:00 · 3e86637327
commit 3e86637327
parent 795c51dc01
1 changed files with 5 additions and 1 deletions
--- a/modules/lnd.nix
+++ b/modules/lnd.nix
@ -98,7 +98,11 @@ in {
      postStart = ''
        umask 377

-        sleep 5
+        attempts=50
+        while ! { exec 3>/dev/tcp/127.0.0.1/8080 && exec 3>&-; } &>/dev/null; do
+              ((attempts-- == 0)) && { echo "lnd REST service unreachable"; exit 1; }
+              sleep 0.1
+        done

        if [[ ! -f /secrets/lnd-seed-mnemonic ]]; then
          echo Creating lnd seed