sql_exporter: adding package plus config, user and group (#869)

* sql_exporter: adding package plus config, user and group

* app-metrics/sql_exporter: improve init script

* app-metrics/sql_exporter: rework ebuild

* sql_exporter: adding package plus config, user and group

---------

Co-authored-by: Patrice Clement <[email protected]>

acct-group/sql_exporter/metadata.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>[email protected]</email>
+	</maintainer>
+</pkgmetadata>

acct-group/sql_exporter/sql_exporter-0.ebuild

@@ -0,0 +1,8 @@
+# Copyright 2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit acct-group
+
+ACCT_GROUP_ID=-1

acct-user/sql_exporter/metadata.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>[email protected]</email>
+	</maintainer>
+</pkgmetadata>

acct-user/sql_exporter/sql_exporter-0.ebuild

@@ -0,0 +1,13 @@
+# Copyright 2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit acct-user
+
+DESCRIPTION="SQL Exporter for Prometheus"
+
+ACCT_USER_ID=-1
+ACCT_USER_GROUPS=( ${PN} )
+
+acct-user_add_deps

app-metrics/sql_exporter/Manifest

@@ -0,0 +1 @@
+DIST sql_exporter-0.5.3.tar.gz 11600200 BLAKE2B f249f54bae8c42984087f365530392d8dd3162a9314e4a58744de23463786833d452ed379b2f785871fbeca6c9feb312307d59f490677ce71df81b33c3f313f7 SHA512 e6f01bdd47e9cf43077662d42fb4500dc0dbfc2bd3462e8082595cfd810c104e6404334c272ecb3459dc604f85147089c88da73200b68543bc4473ab37c8c3e0

app-metrics/sql_exporter/files/sql_exporter.init.d

@@ -0,0 +1,15 @@
+#!/sbin/openrc-run
+# Copyright 2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+name="sql_exporter daemon"
+description="SQL Exporter allows to run custom queries against a database"
+command="/usr/bin/sql_exporter"
+command_args="-config.file /etc/sql_exporter/sql_exporter.yml"
+output_log="/var/log/sql_exporter/sql_exporter.log"
+error_log="/var/log/sql_exporter/sql_exporter.log"
+start_stop_daemon_args="--background --user sql_exporter"
+
+depend() {
+    need net
+}

app-metrics/sql_exporter/files/sql_exporter.yml

@@ -0,0 +1,47 @@
+---
+# jobs is a map of jobs, define any number but please keep the connection usage on the DBs in mind
+jobs:
+  # each job needs a unique name, it's used for logging and as an default label
+- name: "postgres"
+  # interval defined the pause between the runs of this job
+  interval: '1m'
+  # cron_schedule when to execute the job in the standard CRON syntax
+  # if specified, the interval is ignored
+  #cron_schedule: "0 0 * * *"
+  # connections is an array of connection URLs
+  # each query will be executed on each connection
+  connections:
+  - 'postgres://sql_exporter@/?host=/run/postgresql&dbname=postgres&sslmode=disable'
+  # startup_sql is an array of SQL statements
+  # each statements is executed once after connecting
+  startup_sql:
+  - 'SET lock_timeout = 1000'
+  - 'SET idle_in_transaction_session_timeout = 100'
+  # queries is a map of Metric/Query mappings
+  queries:
+    # name is prefied with sql_ and used as the metric name
+  - name: "running_queries"
+    # help is a requirement of the Prometheus default registry, currently not
+    # used by the Prometheus server. Important: Must be the same for all metrics
+    # with the same name!
+    help: "Number of running queries"
+    # Optional: Column to use as a metric timestamp source.
+    # Leave unset if it's not needed
+    timestamp: "created_at"
+    # Labels is an array of columns which will be used as additional labels.
+    # Must be the same for all metrics with the same name!
+    # All labels columns should be of type text, varchar or string
+    labels:
+      - "datname"
+      - "usename"
+    # Values is an array of columns used as metric values. All values should be
+    # of type float
+    values:
+      - "count"
+    # Query is the SQL query that is run unalterted on the each of the connections
+    # for this job
+    query:  |
+            SELECT now() as created_at, datname::text, usename::text, COUNT(*)::float AS count
+            FROM pg_stat_activity GROUP BY created_at, datname, usename;
+    # Consider the query failed if it returns zero rows
+    allow_zero_rows: false

app-metrics/sql_exporter/metadata.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>[email protected]</email>
+		<name>Adjust Ops</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">justwatchcom/sql_exporter</remote-id>
+	</upstream>
+</pkgmetadata>

app-metrics/sql_exporter/sql_exporter-0.5.3.ebuild

@@ -0,0 +1,59 @@
+# Copyright 2024 @Leo
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit golang-build golang-vcs-snapshot
+
+DESCRIPTION="Prometheus exporter for SQL database metrics."
+HOMEPAGE="https://github.com/justwatchcom/sql_exporter"
+SRC_URI="https://github.com/justwatchcom/sql_exporter/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="doc"
+
+DEPEND="
+	dev-lang/go
+	acct-group/sql_exporter
+	acct-user/sql_exporter"
+
+RDEPEND="
+	${DEPEND}"
+
+EGO_PN="github.com/justwatchcom/sql_exporter"
+
+src_prepare() {
+	default
+	cd "${S}"
+	export GO111MODULE=auto
+}
+
+src_compile() {
+	export GOPATH="${S}"
+	cd "${S}/src/${EGO_PN}"
+	echo "compiling from $(pwd)"
+	go build -o "${S}/bin/sql_exporter"
+}
+
+src_test() {
+	cd "${S}/src/${EGO_PN}"
+	go test -v ./... 
+}
+
+src_install() {
+    dobin "${S}/bin/sql_exporter"
+    newinitd "${FILESDIR}/sql_exporter.init.d" sql_exporter
+    dosym /etc/init.d/sql_exporter /etc/runlevels/default/sql_exporter
+
+    insinto /etc/sql_exporter
+    doins "${FILESDIR}/sql_exporter.yml"
+
+    # Create log directory and file
+    dodir /var/log/sql_exporter
+    touch "${ED}"/var/log/sql_exporter/sql_exporter.log
+
+    # Change ownership of the log file to sql_exporter
+    chown sql_exporter:sql_exporter "${ED}"/var/log/sql_exporter/sql_exporter.log
+}