1 files changed, 114 insertions, 0 deletions
diff --git a/krebs/5pkgs/simple/logf/default.nix b/krebs/5pkgs/simple/logf/default.nix
new file mode 100644
index 000000000..ac95acb33
--- /dev/null
+++ b/krebs/5pkgs/simple/logf/default.nix
@@ -0,0 +1,114 @@
+{ lib, pkgs, ... }:
+
+with import <stockholm/lib>;
+
+let
+  default-host-colors = pkgs.writeJSON "logf.default-host-colors.json" {
+  };
+  default-prio-colors = pkgs.writeJSON "logf.default-prio-colors.json" {
+    "0" = 196; # emerg
+    "1" = 160; # alert
+    "2" = 124; # crit
+    "3" = 009; # err
+    "4" = 011; # warning
+    "5" = 255; # notice
+    "6" = 250; # info
+    "7" = 139; # debug
+    "-" = 005; # undefined priority
+  };
+  default-urgent = pkgs.writeJSON "logf.default-urgent.json" [
+  ];
+in
+
+pkgs.writeDashBin "logf" ''
+  export LOGF_HOST_COLORS LOGF_PRIO_COLORS LOGF_URGENT
+  LOGF_HOST_COLORS=$(cat "''${LOGF_HOST_COLORS-${default-host-colors}}")
+  LOGF_PRIO_COLORS=$(cat "''${LOGF_PRIO_COLORS-${default-prio-colors}}")
+  LOGF_URGENT=$(cat "''${LOGF_URGENT-${default-urgent}}")
+  printf '%s\0' "$@" \
+    | ${pkgs.findutils}/bin/xargs -0 -P 0 -n 1 ${pkgs.writeDash "logf-remote" ''
+        target=$1
+        target_host=$(echo "$1" | sed 's/^.*@//;s/\..*//')
+        exec 3>&1
+        2>&1 1>&3 ssh "$target" -T \
+            -o PreferredAuthentications=publickey \
+            -o StrictHostKeyChecking=yes \
+            exec journalctl -af -n 0 -o json \
+          | stdbuf -oL jq -Rcf ${pkgs.writeJq "logf-remote-error.jq" ''
+              {
+                PRIORITY: "4",
+                MESSAGE: .,
+                SYSLOG_IDENTIFIER: env.target_host,
+              }
+            ''}
+        sleep 10m
+        exec "$0" "$@"
+      ''} \
+    | ${pkgs.jq}/bin/jq -Rrf ${pkgs.writeJq "logf-filter.jq" ''
+        (env.LOGF_HOST_COLORS | fromjson) as $host_colors |
+        (env.LOGF_PRIO_COLORS | fromjson) as $prio_colors |
+        (env.LOGF_URGENT | fromjson | map("(\(.))") | join("|"))
+          as $urgent_regex |
+
+        def when(c; f): if c then f else . end;
+
+        # anaphoric gsub
+        def agsub(re; f):
+          # Don't try empty regex: https://github.com/stedolan/jq/issues/1206
+          when(re != ""; gsub("(?<it>\(re))"; .it | f));
+
+        # :: [int] -> sgr
+        def sgr: "\u001b[\(map(tostring) | join(";"))m";
+
+        # :: sgr
+        def rst: [] | sgr;
+
+        # :: int -> sgr
+        def fg(i): [38,5,i]|sgr;
+        # TODO def fg(r;g;b): [38,2,r,g,b]|sgr;
+        # http://cvs.schmorp.de/rxvt-unicode/src/command.C?revision=1.570&view=markup&sortby=log&sortdir=down
+
+        # (sgr; sgr) | (null; any) :: str -> str
+        def col(a; b): when(a != null; a + . + b);
+        def col(a): col(a; rst);
+
+
+        def p_time:
+          ._SOURCE_REALTIME_TIMESTAMP
+          | if . != null then . | fromjson | . / 1000000 else now end
+          | gmtime
+          | todateiso8601
+          | col(fg(237));
+
+        def p_host:
+          ._HOSTNAME
+          | if . != null then . else "-" end
+          | col($host_colors[.]|when(. != null; fg(.)));
+
+        def p_ident:
+          if .SYSLOG_IDENTIFIER != null then .SYSLOG_IDENTIFIER
+          else ._COMM end
+          | col(fg(244));
+
+        def p_message:
+          fg($prio_colors[if has("PRIORITY") then .PRIORITY else "-" end])
+            as $prio_c |
+          .MESSAGE
+          | sub("\r$"; "")
+          | agsub($urgent_regex; "\(.)\u0007" | col(fg(219); $prio_c))
+          | col($prio_c);
+
+        try fromjson catch {
+          _SOURCE_REALTIME_TIMESTAMP: now | tostring | sub("[.]"; ""),
+          SYSLOG_IDENTIFIER: "logf/journalctl",
+          MESSAGE: .,
+        } |
+
+        [ p_time
+        , p_host
+        , p_ident
+        , p_message
+        ]
+        | join(" ")
+      ''}
+''