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This commit is contained in:
Lewis Wynne 2026-04-29 16:13:53 +01:00
parent 883eb2ea89
commit 5f43f6b2cd
3 changed files with 57 additions and 11 deletions
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9
modules/uptime/default.nix
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@ -47,7 +47,13 @@ in
displayDays = lib.mkOption {
type = lib.types.int;
default = 30;
description = "How many days of history to render in the bar.";
description = "How many days of history to render in the long-term bar (1 cell = 1 day).";
};
displayHours = lib.mkOption {
type = lib.types.int;
default = 24;
description = "How many hours of recent history to render in the short-term bar (1 cell = 1 hour).";
};
};
@ -73,6 +79,7 @@ in
OUTPUT_PATH = cfg.outputPath;
RETENTION_DAYS = toString cfg.retentionDays;
DISPLAY_DAYS = toString cfg.displayDays;
DISPLAY_HOURS = toString cfg.displayHours;
};
serviceConfig = {
Type = "oneshot";

58
modules/uptime/run.sh
View file

@ -2,6 +2,7 @@
: "${OUTPUT_PATH:?must be set}"
: "${RETENTION_DAYS:?must be set}"
: "${DISPLAY_DAYS:?must be set}"
: "${DISPLAY_HOURS:?must be set}"
state_dir=$(dirname "$OUTPUT_PATH")
mkdir -p "$state_dir"
@ -9,6 +10,14 @@ mkdir -p "$state_dir"
now=$(date -u +%s)
retention_cutoff=$(( now - RETENTION_DAYS * 86400 ))
max_name_len=0
while IFS= read -r line; do
[ -z "$line" ] && continue
n=${line%% *}
(( ${#n} > max_name_len )) && max_name_len=${#n}
done <<< "$SERVICES"
name_col=$(( max_name_len + 2 ))
# Probe each service and rotate its log.
while IFS= read -r line; do
[ -z "$line" ] && continue
@ -80,35 +89,64 @@ render_row() {
}' "$log_file"
}
day_bucket=86400
day_bar_cells=30
day_bucket=$(( DISPLAY_DAYS * 86400 / day_bar_cells ))
days_per_cell=$(( DISPLAY_DAYS / day_bar_cells ))
if (( days_per_cell == 1 )); then
day_unit="1 day"
else
day_unit="$days_per_cell days"
fi
hour_bar_cells="$DISPLAY_HOURS"
hour_bucket=3600
scale_bar() {
local cells="$1"
local left_label="$2"
local right_label="$3"
local fill=$(( cells - ${#left_label} - ${#right_label} ))
local cells="$1" left="$2" right="$3"
local fill=$(( cells - ${#left} - ${#right} ))
if (( fill < 1 )); then
printf '%*s' "$cells" '' | tr ' ' '-'
else
printf '%s%*s%s' "$left_label" "$fill" '' "$right_label"
printf '%s%*s%s' "$left" "$fill" '' "$right"
fi
}
center() {
local width="$1" text="$2"
local fill=$(( width - ${#text} ))
if (( fill <= 0 )); then
printf '%s' "$text"
else
local left_pad=$(( fill / 2 )) right_pad
right_pad=$(( fill - left_pad ))
printf '%*s%s%*s' "$left_pad" '' "$text" "$right_pad" ''
fi
}
day_scale=$(scale_bar "$day_bar_cells" "<-${DISPLAY_DAYS}d" "now->")
hour_scale=$(scale_bar "$hour_bar_cells" "<-${DISPLAY_HOURS}h" "now->")
tmp="$OUTPUT_PATH.tmp"
{
printf '# updated %s\n\n' "$(date -u -d "@$now" '+%Y-%m-%d %H:%M:%S UTC')"
printf '%-20s %s\n' '' "$(scale_bar "$DISPLAY_DAYS" "<-${DISPLAY_DAYS}d" "now->")"
printf "%-${name_col}s%s %s\n" '' "$day_scale" "$hour_scale"
while IFS= read -r line; do
[ -z "$line" ] && continue
name=${line%% *}
url=${line#* }
log="$state_dir/$name.log"
read -r bar pct state < <(render_row "$log" "$now" "$day_bucket" "$DISPLAY_DAYS")
printf '%-20s %s %-7s %7s%% %s\n' "$name" "$bar" "$state" "$pct" "$url"
read -r day_bar day_pct _ < <(render_row "$log" "$now" "$day_bucket" "$day_bar_cells")
read -r hour_bar _ state < <(render_row "$log" "$now" "$hour_bucket" "$hour_bar_cells")
printf "%-${name_col}s%s %s %-4s %7s%% %s\n" \
"$name" "$day_bar" "$hour_bar" "$state" "$day_pct" "$url"
done <<< "$SERVICES"
printf '\nlegend: = up - degraded _ down . no data (1 cell = 1 day)\n'
printf "%-${name_col}s%s %s\n" '' \
"$(center "$day_bar_cells" "1 cell = $day_unit")" \
"$(center "$hour_bar_cells" "1 cell = 1 hour")"
printf '\nlegend: = up - degraded _ down . no data\n'
} > "$tmp"
mv "$tmp" "$OUTPUT_PATH"