feat: add example server

Co-authored-by: Simon Podlipsky <[email protected]>

.github/workflows/examples.yaml

@@ -0,0 +1,28 @@
+name: Examples
+
+on:
+  pull_request:
+  push:
+    branches:
+      - 0.*.x
+  workflow_dispatch:
+
+jobs:
+  Server:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./examples/server
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup golang environment
+        uses: actions/setup-go@v3
+        with:
+          go-version: '1.18.4'
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Run test case 
+        run: go test .

examples/server/README.md

@@ -0,0 +1,5 @@
+Example server
+
+1. [download](https://go.dev/dl/) and install `go compiler`
+2. Run the demo application `go run main.go`
+3. Add a data source in grafana. The URL value is the address of the demo service, for example: `http://localhost:8181/api/grafana/json/`

examples/server/go.mod

@@ -0,0 +1,11 @@
+module github.com/simPod/GrafanaJsonDatasource/examples/server
+
+go 1.18
+
+require github.com/stretchr/testify v1.8.0
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

examples/server/go.sum

@@ -0,0 +1,15 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

examples/server/main.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+)
+
+func newHandler() http.Handler {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/api/grafana/json", hello)
+	mux.HandleFunc("/api/grafana/json/search", getSearch)
+	mux.HandleFunc("/api/grafana/json/options", getOptions)
+	return mux
+}
+
+func main() {
+	log.Println("grafana api: /api/grafana/json")
+	log.Println("listen 0.0.0.0:8081")
+	http.ListenAndServe(":8181", newHandler())
+}
+
+var defaultMetrics = `
+[{
+  "text": "Lorem",
+  "value": "a"
+},{
+  "text": "Ipsum",
+  "value": "b"
+}]
+`
+
+type MetricsRequest struct {
+	Metric  string                 `json:"metric"`
+	Payload map[string]interface{} `json:"payload"`
+}
+
+func getSearch(writer http.ResponseWriter, request *http.Request) {
+	var req MetricsRequest
+	err := json.NewDecoder(request.Body).Decode(&req)
+	if err != nil {
+		writer.WriteHeader(500)
+		return
+	}
+	writer.Header().Set("content-type", "application/json")
+	writer.Write([]byte(defaultMetrics))
+}
+
+type OptionsRequest struct {
+	Name    string                 `json:"name"`
+	Metric  string                 `json:"metric"`
+	Payload map[string]interface{} `json:"payload"`
+}
+
+func getOptions(writer http.ResponseWriter, request *http.Request) {
+	var req OptionsRequest
+	err := json.NewDecoder(request.Body).Decode(&req)
+	if err != nil {
+		writer.WriteHeader(500)
+		return
+	}
+	writer.Header().Set("content-type", "application/json")
+	switch req.Name {
+	case "instanceId":
+		writer.Write([]byte(`[{ 
+      "label": "My Database 1",
+      "value": "sadbip2kasdmnlo"
+    },{
+      "label": "My Database 2",
+      "value": "sadbip2kasdmnla"
+    },{
+      "label": "My Database 3",
+      "value": "sadbip2kasdmnlx"
+    }]`))
+
+	case "metric":
+		writer.Write([]byte(`[{ 
+      "label": "CPUUtilization",
+      "value": "CPUUtilization"
+    },{
+      "label": "DiskReadIOPS",
+      "value": "DiskReadIOPS"
+    },{
+      "label": "memory_freeutilization",
+      "value": "memory_freeutilization"
+    }]`))
+	case "namespace":
+		writer.Write([]byte(`[{ 
+      "label": "MongoDB",
+      "value": "acs_mongodb"
+    },{
+      "label": "RDS",
+      "value": "acs_rds"
+    },{
+      "label": "Load balancer",
+      "value": "acs_load_balancer"
+    }]`))
+	}
+}
+func hello(writer http.ResponseWriter, request *http.Request) {
+	writer.Write([]byte("ok"))
+}

examples/server/main_test.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_Hello(t *testing.T) {
+	mux := newHandler()
+	server := httptest.NewServer(mux)
+	resp, err := http.Get(server.URL + "/api/grafana/json")
+	require.NoError(t, err)
+	require.Equal(t, resp.StatusCode, 200)
+	rawBody, err := ioutil.ReadAll(resp.Body)
+	resp.Body.Close()
+	require.NoError(t, err)
+	require.Equal(t, string(rawBody), "ok")
+}
+
+type payloadConfig struct {
+	Label string `json:"label"`
+	Name  string `json:"value"`
+}
+
+type metricConfig struct {
+	Label    string          `json:"label"`
+	Value    string          `json:"value"`
+	Payloads []payloadConfig `json:"payloads"`
+}
+
+func Test_Metrics(t *testing.T) {
+	mux := newHandler()
+	server := httptest.NewServer(mux)
+	resp, err := http.Post(server.URL+"/api/grafana/json/search", "application/json", bytes.NewBuffer([]byte("{}")))
+	require.NoError(t, err)
+	require.Equal(t, resp.StatusCode, 200)
+	rawBody, err := ioutil.ReadAll(resp.Body)
+	resp.Body.Close()
+	require.NoError(t, err)
+	var metrics []metricConfig
+	require.NoError(t, json.Unmarshal(rawBody, &metrics))
+	require.Len(t, metrics, 2)
+}
+
+func Test_Options(t *testing.T) {
+	mux := newHandler()
+	server := httptest.NewServer(mux)
+	payload := `{"metric":"DescribeMetricList","payload":{"namespace":"acs_rds"},"name":"instanceId"}`
+	resp, err := http.Post(server.URL+"/api/grafana/json/options", "application/json", bytes.NewBuffer([]byte(payload)))
+	require.NoError(t, err)
+	require.Equal(t, resp.StatusCode, 200)
+	rawBody, err := ioutil.ReadAll(resp.Body)
+	resp.Body.Close()
+	require.NoError(t, err)
+	var metrics []metricConfig
+	require.NoError(t, json.Unmarshal(rawBody, &metrics))
+	require.Len(t, metrics, 3)
+}