Add ability to override synthetic monitoring base URL

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+name: Release
+on:
+  push:
+    tags:
+      - 'v*'
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Unshallow
+        run: git fetch --prune --unshallow
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: 1.19
+
+      - name: Release Grizzly Binaries
+        uses: goreleaser/goreleaser-action@v4
+        with:
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yaml

@@ -0,0 +1,39 @@
+# Visit https://goreleaser.com for documentation on how to customize this
+# behavior.
+before:
+  hooks:
+    # this is just an example and not a requirement for provider building/publishing
+    - go mod tidy
+builds:
+- env:
+    # goreleaser does not work with CGO, it could also complicate
+    # usage by users in CI/CD systems like Terraform Cloud where
+    # they are unable to install libraries.
+    - CGO_ENABLED=0
+  main: ./cmd/grr
+  mod_timestamp: '{{ .CommitTimestamp }}'
+  flags:
+    - -trimpath
+  ldflags:
+    - '-s -w -X main.Version={{.Version}}'
+  goos:
+    - linux
+    - darwin
+  goarch:
+    - amd64
+    - arm
+    - arm64
+  ignore:
+    - goos: darwin
+      goarch: arm
+  binary: grr
+archives:
+  - name_template: 'grr-{{ .Os }}-{{ .Arch }}'
+checksum:
+  name_template: 'grr-sha256-checksums.txt'
+  algorithm: sha256
+release:
+  # If you want to manually examine the release before its live, uncomment this line:
+  draft: false
+changelog:
+  skip: true

pkg/grafana/synthetic-monitoring.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/url"
 	"os"
 	"strconv"
 	"time"
@@ -28,7 +29,7 @@ import (
  *    them to IDs, having requested an ID<->string mapping from the API.
  */
 
-const smBaseURL = "https://synthetic-monitoring-api.grafana.net"
+var smBaseURL = "https://synthetic-monitoring-api.grafana.net"
 
 type Probes struct {
 	ByID   map[int64]synthetic_monitoring.Probe
@@ -42,6 +43,14 @@ func NewSyntheticMonitoringClient() (*smapi.Client, error) {
 		return nil, err
 	}
 
+	if smBaseOverrideURLFromEnv, exists := os.LookupEnv("GRAFANA_SM_URL"); exists {
+		smBaseOverrideURL, err := url.ParseRequestURI(smBaseOverrideURLFromEnv)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse GRAFANA_SM_URL environment variable - %v", err)
+		}
+		smBaseURL = smBaseOverrideURL.String()
+	}
+
 	smClient := smapi.NewClient(smBaseURL, "", client)
 
 	apiToken, ok := os.LookupEnv("GRAFANA_SM_TOKEN")