first commit

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "gomod" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/analysis.yml

@@ -0,0 +1,19 @@
+name: Analysis
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  analyse:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - name: checks
+        run: |
+          go get -u golang.org/x/lint/golint
+          golint ./...
+          go vet ./...

.github/workflows/codeql-analysis.yml

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+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches:
+      - develop
+  schedule:
+    - cron: '23 3 * * 6'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      # Initializes the CodeQL tools for scanning.
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v1
+        with:
+          languages: ${{ matrix.language }}
+          # If you wish to specify custom queries, you can do so here or in a config file.
+          # By default, queries listed here will override any specified in a config file.
+          # Prefix the list here with "+" to use these queries and those in the config file.
+          # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+      # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+      # If this step fails, then you should remove it and run the build manually (see below)
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v1
+
+      # ℹ️ Command-line programs to run using the OS shell.
+      # 📚 https://git.io/JvXDl
+
+      # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+      #    and modify them (or add more) to build your code if your project
+      #    uses a compiled language
+
+      #- run: |
+      #   make bootstrap
+      #   make release
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v1

.github/workflows/test.yml

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+name: Test
+
+on:
+  push:
+  pull_request_target:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    container: golang:1.15
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - name: test
+        run: |
+          go test ./... -race -coverprofile=coverage.txt -covermode=atomic
+      - uses: codecov/codecov-action@v1
+        with:
+          file: coverage.txt
+          token: ${{ secrets.CODECOV_TOKEN }}

LICENSE.md

@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2021 Christophe Lambin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

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+# grafana-json
+![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/clambin/grafana-json?color=green&label=Release&style=plastic)
+![Codecov](https://img.shields.io/codecov/c/gh/clambin/grafana-json?style=plastic)
+![Test](https://github.com/clambin/grafana-json/workflows/Test/badge.svg)
+![Go Report Card](https://goreportcard.com/badge/github.com/clambin/grafana-json)
+![GitHub](https://img.shields.io/github/license/clambin/grafana-json?style=plastic)
+
+Basic Go implementation of a Grafana Simple JSON API server

endpoints.go

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+package grafana_json
+
+import (
+	"encoding/json"
+	"fmt"
+	log "github.com/sirupsen/logrus"
+	"io/ioutil"
+	"net/http"
+)
+
+// endpoints
+
+func (apiServer *APIServer) hello(w http.ResponseWriter, _ *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	_, _ = fmt.Fprintf(w, "Hello")
+}
+
+func (apiServer *APIServer) search(w http.ResponseWriter, _ *http.Request) {
+	targets := apiServer.apiHandler.Search()
+	if output, err := json.Marshal(targets); err == nil {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write(output)
+	} else {
+		log.WithField("err", err).Warning("failed to create search response")
+		http.Error(w, "failed to create search response", http.StatusInternalServerError)
+	}
+}
+
+func (apiServer *APIServer) query(w http.ResponseWriter, req *http.Request) {
+	var (
+		err            error
+		bytes          []byte
+		request        QueryRequest
+		responses      []*QueryResponse
+		tableResponses []*QueryTableResponse
+		output         []byte
+	)
+	defer req.Body.Close()
+
+	if bytes, err = ioutil.ReadAll(req.Body); err == nil {
+		err = json.Unmarshal(bytes, &request)
+	}
+
+	if err != nil {
+		log.WithField("err", err).Warning("failed to parse request")
+		http.Error(w, "failed to parse request", http.StatusBadRequest)
+		return
+	}
+
+	responses, tableResponses, err = apiServer.handleQueryRequest(&request)
+
+	if err == nil {
+		packed := make([]interface{}, 0)
+		for _, response := range responses {
+			packed = append(packed, response)
+		}
+		for _, response := range tableResponses {
+			packed = append(packed, response)
+		}
+
+		output, err = json.Marshal(packed)
+	}
+
+	if err == nil {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write(output)
+	} else {
+		log.WithField("err", err).Warning("unable to create response")
+		http.Error(w, "unable to create response", http.StatusInternalServerError)
+	}
+}
+
+func (apiServer *APIServer) handleQueryRequest(request *QueryRequest) (responses []*QueryResponse, tableResponses []*QueryTableResponse, err error) {
+	for _, target := range request.Targets {
+		switch target.Type {
+		case "timeserie", "":
+			var response *QueryResponse
+			if response, err = apiServer.apiHandler.Query(target.Target, request); err == nil {
+				response.Target = target.Target
+				responses = append(responses, response)
+			}
+		case "table":
+			var response *QueryTableResponse
+			if response, err = apiServer.apiHandler.QueryTable(target.Target, request); err == nil {
+				tableResponses = append(tableResponses, response)
+			}
+		default:
+			log.WithFields(log.Fields{"target": target.Target, "type": target.Type}).Warning("invalid target type")
+			err = fmt.Errorf("unsupport target type: %s", target.Type)
+			break
+		}
+	}
+	return
+}

go.mod

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+module github.com/clambin/grafana-json
+
+go 1.15
+
+require (
+	github.com/gorilla/mux v1.8.0
+	github.com/prometheus/client_golang v1.9.0
+	github.com/sirupsen/logrus v1.6.0
+	github.com/stretchr/testify v1.7.0
+)