add initial version of Grafana updater

grafana-watcher/grafana/dashboard.go

@@ -0,0 +1,80 @@
+package grafana
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"strings"
+)
+
+type DashboardsInterface interface {
+	Search() ([]GrafanaDashboard, error)
+	Create(dashboardJson io.Reader) error
+	Delete(slug string) error
+}
+
+type DashboardsClient struct {
+	BaseUrl    string
+	HTTPClient *http.Client
+}
+
+type GrafanaDashboard struct {
+	Id    int    `json:"id"`
+	Title string `json:"title"`
+	Uri   string `json:"uri"`
+}
+
+func (d *GrafanaDashboard) Slug() string {
+	// The uri in the search result contains the slug.
+	// http://docs.grafana.org/v3.1/http_api/dashboard/#search-dashboards
+	return strings.TrimPrefix(d.Uri, "db/")
+}
+
+func NewDashboardsClient(baseUrl string, c *http.Client) DashboardsInterface {
+	return &DashboardsClient{
+		BaseUrl:    baseUrl,
+		HTTPClient: c,
+	}
+}
+
+func (c *DashboardsClient) Search() ([]GrafanaDashboard, error) {
+	searchUrl := c.BaseUrl + "/api/search"
+	resp, err := c.HTTPClient.Get(searchUrl)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	searchResult := make([]GrafanaDashboard, 0)
+	err = json.NewDecoder(resp.Body).Decode(&searchResult)
+	if err != nil {
+		return nil, err
+	}
+
+	return searchResult, nil
+}
+
+func (c *DashboardsClient) Delete(slug string) error {
+	deleteUrl := c.BaseUrl + "/api/dashboards/db/" + slug
+	req, err := http.NewRequest("DELETE", deleteUrl, nil)
+	if err != nil {
+		return err
+	}
+
+	_, err = c.HTTPClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *DashboardsClient) Create(dashboardJson io.Reader) error {
+	importDashboardUrl := c.BaseUrl + "/api/dashboards/import"
+	_, err := c.HTTPClient.Post(importDashboardUrl, "application/json", dashboardJson)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

grafana-watcher/grafana/grafana.go

@@ -0,0 +1,25 @@
+package grafana
+
+import (
+	"net/http"
+)
+
+type Interface interface {
+	Dashboards() DashboardsInterface
+}
+
+type Clientset struct {
+	BaseUrl    string
+	HTTPClient *http.Client
+}
+
+func New(baseUrl string) Interface {
+	return &Clientset{
+		BaseUrl:    baseUrl,
+		HTTPClient: http.DefaultClient,
+	}
+}
+
+func (c *Clientset) Dashboards() DashboardsInterface {
+	return NewDashboardsClient(c.BaseUrl, c.HTTPClient)
+}