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68 lines
1.9 KiB
Bash
Executable File
68 lines
1.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright 2021 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Serves a collection of scrape files up to Prometheus scraping.
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# Usage: $0 port_num scrapes-dir
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#
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# Where scrapes-dir has descendant files whose name is of the form
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# <timestamp>.scrape
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# where <timestamp> is seconds since Jan 1, 1970 UTC.
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# Each such file is taken to be a scrape that lacks timestamps,
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# and the timestamp from the filename is multiplied by the necessary 1000
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# and added to the data in that file.
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# This requires an `nc` command that this script knows how to wrangle.
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if (( $# != 2 )); then
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echo "Usage: $0 port_num scrapes_dir" >&2
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exit 1
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fi
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port_num="$1"
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scrapes_dir="$2"
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response_file="/tmp/$(cd /tmp && mktemp response.XXXXXX)"
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cleanup_serve() {
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rm -rf "$response_file"
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}
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trap cleanup_serve EXIT
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chmod +r "$response_file"
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transform() {
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path="$1"
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base="$(basename "$path")"
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seconds="${base%.scrape}"
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sed 's/^\([^#].*\)$/\1 '"${seconds}000/" "$path"
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}
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find_and_transform() {
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echo -n $'HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\n\r\n' > "$response_file"
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find "$scrapes_dir" -name "*.scrape" -print0 | sort -z | while read -d '' -r scrapename; do transform "$scrapename" >> "$response_file"; done
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}
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find_and_transform
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if man nc | grep -wq -e -N
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then dashen=-N
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else dashen=
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fi
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# shellcheck disable=SC2086
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while true; do nc -l $dashen 0.0.0.0 "$port_num" < "$response_file" > /dev/null; sleep 10; done
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