feat: enables remote custom analyzers (#906)

* feat: enables remote custom analyzers

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: fixed test that was broken

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: hiding custom analysis behind a flag

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: resolved govet issue

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: updated

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: updated

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: updated deps

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

* chore: updated deps

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

---------

Signed-off-by: Alex Jones <alexsimonjones@gmail.com>

README.md

@@ -459,6 +459,33 @@ k8sgpt cache remove
 ```
 </details>
 
+<details>
+<summary> Custom Analyzers</summary>
+
+There may be scenarios where you wish to write your own analyzer in a language of your choice.
+K8sGPT now supports the ability to do so by abiding by the [schema](https://github.com/k8sgpt-ai/schemas/blob/main/protobuf/schema/v1/analyzer.proto) and serving the analyzer for consumption.
+To do so, define the analyzer within the K8sGPT configuration and it will add it into the scanning process.
+In addition to this you will need to enable the following flag on analysis:
+```
+k8sgpt analyze --custom-analysis
+```
+
+Here is an example local host analyzer in [Rust](https://github.com/k8sgpt-ai/host-analyzer)
+When this is run on `localhost:8080` the K8sGPT config can pick it up with the following additions:
+
+```
+custom_analyzers:
+  - name: host-analyzer
+    connection:
+      url: localhost
+      port: 8080
+```
+
+This now gives the ability to pass through hostOS information ( from this analyzer example ) to K8sGPT to use as context with normal analysis.
+
+_See the docs on how to write a custom analyzer_
+
+</details>
 
 ## Documentation
 

cmd/analyze/analyze.go

@@ -37,6 +37,7 @@ var (
 	maxConcurrency  int
 	withDoc         bool
 	interactiveMode bool
+	customAnalysis  bool
 )
 
 // AnalyzeCmd represents the problems command
@@ -65,6 +66,9 @@ var AnalyzeCmd = &cobra.Command{
 		}
 		defer config.Close()
 
+		if customAnalysis {
+			config.RunCustomAnalysis()
+		}
 		config.RunAnalysis()
 
 		if explain {
@@ -131,4 +135,7 @@ func init() {
 	AnalyzeCmd.Flags().BoolVarP(&withDoc, "with-doc", "d", false, "Give me the official documentation of the involved field")
 	// interactive mode flag
 	AnalyzeCmd.Flags().BoolVarP(&interactiveMode, "interactive", "i", false, "Enable interactive mode that allows further conversation with LLM about the problem. Works only with --explain flag")
+	// custom analysis flag
+	AnalyzeCmd.Flags().BoolVarP(&customAnalysis, "custom-analysis", "z", false, "Enable custom analyzers")
+
 }

pkg/analysis/analysis.go

@@ -28,6 +28,7 @@ import (
 	"github.com/k8sgpt-ai/k8sgpt/pkg/analyzer"
 	"github.com/k8sgpt-ai/k8sgpt/pkg/cache"
 	"github.com/k8sgpt-ai/k8sgpt/pkg/common"
+	"github.com/k8sgpt-ai/k8sgpt/pkg/custom"
 	"github.com/k8sgpt-ai/k8sgpt/pkg/kubernetes"
 	"github.com/k8sgpt-ai/k8sgpt/pkg/util"
 	"github.com/schollz/progressbar/v3"
@@ -50,8 +51,10 @@ type Analysis struct {
 	WithDoc            bool
 }
 
-type AnalysisStatus string
-type AnalysisErrors []string
+type (
+	AnalysisStatus string
+	AnalysisErrors []string
+)
 
 const (
 	StateOK              AnalysisStatus = "OK"
@@ -147,6 +150,27 @@ func NewAnalysis(
 	return a, nil
 }
 
+func (a *Analysis) RunCustomAnalysis() {
+	var customAnalyzers []custom.CustomAnalyzer
+	if err := viper.UnmarshalKey("custom_analyzers", &customAnalyzers); err != nil {
+		a.Errors = append(a.Errors, err.Error())
+	}
+
+	for _, cAnalyzer := range customAnalyzers {
+
+		canClient, err := custom.NewClient(cAnalyzer.Connection)
+		if err != nil {
+			a.Errors = append(a.Errors, fmt.Sprintf("Client creation error for %s analyzer", cAnalyzer.Name))
+			continue
+		}
+
+		result, err := canClient.Run()
+		if err != nil {
+			a.Results = append(a.Results, result)
+		}
+	}
+}
+
 func (a *Analysis) RunAnalysis() {
 	activeFilters := viper.GetStringSlice("active_filters")
 

pkg/custom/client.go

@@ -0,0 +1,57 @@
+package custom
+
+import (
+	rpc "buf.build/gen/go/k8sgpt-ai/k8sgpt/grpc/go/schema/v1/schemav1grpc"
+	schemav1 "buf.build/gen/go/k8sgpt-ai/k8sgpt/protocolbuffers/go/schema/v1"
+	"context"
+	"fmt"
+	"github.com/k8sgpt-ai/k8sgpt/pkg/common"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+type Client struct {
+	c              *grpc.ClientConn
+	analyzerClient rpc.AnalyzerServiceClient
+}
+
+func NewClient(c Connection) (*Client, error) {
+
+	conn, err := grpc.Dial(fmt.Sprintf("%s:%s", c.Url, c.Port), grpc.WithTransportCredentials(insecure.NewCredentials()))
+
+	if err != nil {
+		return nil, err
+	}
+	client := rpc.NewAnalyzerServiceClient(conn)
+	return &Client{
+		c:              conn,
+		analyzerClient: client,
+	}, nil
+}
+
+func (cli *Client) Run() (common.Result, error) {
+	var result common.Result
+	req := &schemav1.AnalyzerRunRequest{}
+	res, err := cli.analyzerClient.Run(context.Background(), req)
+	if err != nil {
+		return result, err
+	}
+	if res.Result != nil {
+
+		// We should refactor this, because Error and Failure do not map 1:1 from K8sGPT/schema
+		var errorsFound []common.Failure
+		for _, e := range res.Result.Error {
+			errorsFound = append(errorsFound, common.Failure{
+				Text: e.Text,
+				// TODO: Support sensitive data
+			})
+		}
+
+		result.Name = res.Result.Name
+		result.Kind = res.Result.Kind
+		result.Details = res.Result.Details
+		result.ParentObject = res.Result.ParentObject
+		result.Error = errorsFound
+	}
+	return result, nil
+}

pkg/custom/types.go

@@ -0,0 +1,10 @@
+package custom
+
+type Connection struct {
+	Url  string `json:"url"`
+	Port string `json:"port"`
+}
+type CustomAnalyzer struct {
+	Name       string     `json:"name"`
+	Connection Connection `json:"connection"`
+}