From: Amolith <amolith@secluded.site>
To: ~whereswaldon/arbor-dev@lists.sr.ht
Cc: Amolith <amolith@secluded.site>
Subject: [PATCH 04/12] Move setup source, add templating & more configs
Date: Wed, 20 Jul 2022 23:09:53 -0400
Message-Id: <20220721031001.97027-5-amolith@secluded.site>
In-Reply-To: <20220721031001.97027-1-amolith@secluded.site>
References: <20220721031001.97027-1-amolith@secluded.site>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Signed-off-by: Amolith <amolith@secluded.site>
---
 deploy/setup.go           | 12 ----------
 files/Caddyfile           |  3 +++
 files/arbor-relay.service | 11 +++++++++
 files/prometheus.yml      | 47 +++++++++++++++++++++++++++++++++++++++
 setup.go                  | 39 ++++++++++++++++++++++++++++++++
 5 files changed, 100 insertions(+), 12 deletions(-)
 delete mode 100644 deploy/setup.go
 create mode 100644 files/Caddyfile
 create mode 100644 files/arbor-relay.service
 create mode 100644 files/prometheus.yml

diff --git a/deploy/setup.go b/deploy/setup.go
deleted file mode 100644
index bbb2af9..0000000
--- a/deploy/setup.go
+++ /dev/null
@@ -1,12 +0,0 @@
-//+build mage
-
-package main
-
-import (
-    "github.com/magefile/mage/sh"
-)
-
-// says hoi >:3
-func Build() error {
-	return sh.Run("/bin/echo", "hoooooooooi!")
-}
diff --git a/files/Caddyfile b/files/Caddyfile
new file mode 100644
index 0000000..7b790f9
--- /dev/null
+++ b/files/Caddyfile
@@ -0,0 +1,3 @@
+{{ .Hostname }} {
+    reverse_proxy localhost:9090
+}
diff --git a/files/arbor-relay.service b/files/arbor-relay.service
new file mode 100644
index 0000000..49e281b
--- /dev/null
+++ b/files/arbor-relay.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=Arbor Chat Relay
+
+[Service]
+User=arbor-relay
+Group=arbor-relay
+ExecStart=/usr/local/bin/relay --grovepath /usr/local/share/arbor-relay --tls-ip 0.0.0.0 --tls-port 7117 --keypath /var/lib/caddy/.local/share/caddy/certificates/acme-v02.api.letsencrypt.org-directory/{{ .Hostname }}/{{ .Hostname }}.key --certpath /var/lib/caddy/.local/share/caddy/certificates/acme-v02.api.letsencrypt.org-directory/{{ .Hostname }}/{{ .Hostname }}.crt arbor.chat:7117
+Restart=Always
+
+[Install]
+WantedBy=multi-user.target
diff --git a/files/prometheus.yml b/files/prometheus.yml
new file mode 100644
index 0000000..2e011d6
--- /dev/null
+++ b/files/prometheus.yml
@@ -0,0 +1,47 @@
+global:
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+  # Attach these labels to any time series or alerts when communicating with
+  # external systems (federation, remote storage, Alertmanager).
+  external_labels:
+      monitor: '{{ .Hostname }}'
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets: ['localhost:9093']
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: 'prometheus'
+
+    # Override the global default and scrape targets from this job every 5 seconds.
+    scrape_interval: 5s
+    scrape_timeout: 5s
+
+    # metrics_path defaults to '/metrics'
+    # scheme defaults to 'http'.
+
+    static_configs:
+      - targets: ['localhost:9090']
+
+  - job_name: node
+    # If prometheus-node-exporter is installed, grab stats about the local
+    # machine by default.
+    static_configs:
+      - targets: ['localhost:9100']
+
+  - job_name: arbor-relay
+    static_configs:
+      - targets: ['localhost:2112']
+
diff --git a/setup.go b/setup.go
index de63f25..5fcfb18 100644
--- a/setup.go
+++ b/setup.go
@@ -5,6 +5,10 @@ package main
 import (
 	"embed"
 	"fmt"
+	"log"
+	"os"
+	"strings"
+	"text/template"
 
 	"github.com/magefile/mage/mg"
 	"github.com/magefile/mage/sh"
@@ -113,3 +117,38 @@ func Firewall() error {
 
 	return sh.Run("ufw", "enable")
 }
+
+// config() takes source template and destination file arguments and executes
+// the template replacing `hostname` with the system's hostname.
+func config(rfile string, wfile string) error {
+	log.Println("Generating config from", rfile, "and writing to", wfile)
+
+	// Create a new template using the rfile (read file)
+	data, err := files.ReadFile(rfile)
+	tmpl := template.Must(template.New("temp").Parse(string(data)))
+
+	hostname, err := os.ReadFile("/etc/hostname")
+	if err != nil {
+		return err
+	}
+
+	// Open wfile (write file) for writing generated config
+	file, err := os.OpenFile(wfile, os.O_CREATE|os.O_RDWR, 0660)
+	if err != nil {
+		return err
+	}
+
+	// Compose config file using the template, substituting Hostname with the
+	// contents of /etc/hostname and trimming all whitespace
+	err = tmpl.Execute(file, map[string]string{"Hostname": strings.TrimSpace(string(hostname))})
+	if err != nil {
+		return err
+	}
+
+	err = file.Close()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
-- 
2.37.1