labeler/webhook.go at main · coder/labeler · GitHub

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package labeler

import (

"context"

"encoding/json"

"errors"

"fmt"

"log/slog"

"net/http"

"regexp"

"sort"

"strconv"

"strings"

"time"

"github.com/ammario/tlru"

"github.com/beatlabs/github-auth/app"

"github.com/coder/labeler/ghapi"

"github.com/coder/labeler/httpjson"

"github.com/coder/retry"

"github.com/go-chi/chi/v5"

githook "github.com/go-playground/webhooks/v6/github"

"github.com/google/go-github/v59/github"

"github.com/sashabaranov/go-openai"

"golang.org/x/exp/maps"

"gopkg.in/yaml.v3"

)

type repoAddr struct {

InstallID, User, Repo string

}

type Webhook struct {

Log *slog.Logger

OpenAI *openai.Client

AppConfig *app.Config

Model string

router *chi.Mux

// These caches are primarily useful in the test system, where there are

// many inference requests to the same repo in a short period of time.

// That will rarely happen in production.

repoLabelsCache *tlru.Cache[repoAddr, []*github.Label]

recentIssuesCache *tlru.Cache[repoAddr, []*github.Issue]

}

func (s *Webhook) Init(r *chi.Mux) {

s.router = r

s.router.Mount("/infer", httpjson.Handler(s.infer))

s.router.Mount("/webhook", httpjson.Handler(s.webhook))

s.repoLabelsCache = tlru.New[repoAddr](func(ls []*github.Label) int {

return len(ls)

}, 4096)

s.recentIssuesCache = tlru.New[repoAddr](func(ls []*github.Issue) int {

return len(ls)

}, 4096)

}

func filterIssues(slice []*github.Issue, f func(*github.Issue) bool) []*github.Issue {

var result []*github.Issue

for _, item := range slice {

if f(item) {

result = append(result, item)

}

return result

}

type InferRequest struct {

InstallID, User, Repo string

Issue int `json:"issue"`

// TestMode determines whether the target issue's existing labels

// are stripped before inference.

TestMode bool `json:"test_mode"`

}

type InferResponse struct {

SetLabels []string `json:"set_labels,omitempty"`

TokensUsed int `json:"tokens_used,omitempty"`

DisabledLabels []string `json:"disabled_labels,omitempty"`

}

type repoConfig struct {

Exclude []regexp.Regexp `json:"exclude"`

}

func (c *repoConfig) checkLabel(label string) bool {

for _, re := range c.Exclude {

if re.MatchString(label) {

return false

}

return true

}

func (s *Webhook) getRepoConfig(ctx context.Context, client *github.Client,

owner, repo string,

) (*repoConfig, error) {

fileContent, _, _, err := client.Repositories.GetContents(

ctx,

owner,

repo,

".github/labeler.yml",

&github.RepositoryContentGetOptions{},

)

if err != nil {

var githubErr *github.ErrorResponse

if errors.As(err, &githubErr) && githubErr.Response.StatusCode == http.StatusNotFound {

return &repoConfig{}, nil

}

return nil, fmt.Errorf("get contents: %w", err)

}

content, err := fileContent.GetContent()

if err != nil {

return nil, fmt.Errorf("unmarshal content: %w", err)

}

var config repoConfig

err = yaml.Unmarshal(

[]byte(content),

&config,

)

return &config, err

}

func filterSlice[T any](slice []T, f func(T) bool) []T {

var result []T

for _, item := range slice {

if f(item) {

result = append(result, item)

}

return result

}

func (s *Webhook) Infer(ctx context.Context, req *InferRequest) (*InferResponse, error) {

instConfig, err := s.AppConfig.InstallationConfig(req.InstallID)

if err != nil {

return nil, fmt.Errorf("get installation config: %w", err)

}

githubClient := github.NewClient(instConfig.Client(ctx))

config, err := s.getRepoConfig(ctx, githubClient, req.User, req.Repo)

if err != nil {

return nil, fmt.Errorf("get repo config: %w", err)

}

lastIssues, err := s.recentIssuesCache.Do(repoAddr{

InstallID: req.InstallID,

User: req.User,

Repo: req.Repo,

}, func() ([]*github.Issue, error) {

return ghapi.Page(

ctx,

githubClient,

func(ctx context.Context, opt *github.ListOptions) ([]*github.Issue, *github.Response, error) {

issues, resp, err := githubClient.Issues.ListByRepo(

ctx,

req.User,

req.Repo,

&github.IssueListByRepoOptions{

State: "all",

ListOptions: *opt,

)

return ghapi.OnlyTrueIssues(issues), resp, err

100,

)

}, time.Minute)

if err != nil {

return nil, fmt.Errorf("list issues: %w", err)

}

repoLabels, err := s.repoLabelsCache.Do(repoAddr{

InstallID: req.InstallID,

User: req.User,

Repo: req.Repo,

}, func() ([]*github.Label, error) {

return ghapi.Page(

ctx,

githubClient,

func(ctx context.Context, opt *github.ListOptions) ([]*github.Label, *github.Response, error) {

return githubClient.Issues.ListLabels(ctx, req.User, req.Repo, opt)

// We use the coder/customers label count as a reasonable maximum.

300,

)

}, time.Minute)

if err != nil {

return nil, fmt.Errorf("list labels: %w", err)

}

targetIssue, _, err := githubClient.Issues.Get(ctx, req.User, req.Repo, req.Issue)

if err != nil {

return nil, fmt.Errorf("get target issue: %w", err)

}

// Take out target issue from the list of issues

lastIssues = filterIssues(lastIssues, func(i *github.Issue) bool {

return i.GetNumber() != targetIssue.GetNumber()

})

// Sort by created at.

sort.Slice(lastIssues, func(i, j int) bool {

iTime := lastIssues[i].GetCreatedAt().Time

jTime := lastIssues[j].GetCreatedAt().Time

return iTime.Before(jTime)

})

if req.TestMode {

targetIssue.Labels = nil

}

aiContext := &aiContext{

allLabels: repoLabels,

lastIssues: lastIssues,

targetIssue: targetIssue,

}

retryAI:

ret := retry.New(time.Second, time.Second*10)

resp, err := s.OpenAI.CreateChatCompletion(

ctx,

aiContext.Request(s.Model),

)

if err != nil {

var aiErr *openai.APIError

if errors.As(err, &aiErr) {

if (aiErr.HTTPStatusCode >= 500 || aiErr.HTTPStatusCode == 429) && ret.Wait(ctx) {

s.Log.Warn("retrying AI call", "error", err)

goto retryAI

}

return nil, fmt.Errorf("create chat completion: %w", err)

}

if len(resp.Choices) != 1 {

return nil, fmt.Errorf("expected one choice")

}

choice := resp.Choices[0]

content := choice.Message.Content

var setLabels struct {

Reasoning string `json:"reasoning"`

Labels []string `json:"labels"`

}

err = json.Unmarshal([]byte(content), &setLabels)

if err != nil {

return nil, fmt.Errorf("unmarshal setLabels: %w, content: %q", err, content)

}

s.Log.Info("set labels", "labels", setLabels.Labels, "reasoning", setLabels.Reasoning)

disabledLabels := make(map[string]struct{})

for _, label := range repoLabels {

if strings.Contains(label.GetDescription(), magicDisableString) {

disabledLabels[label.GetName()] = struct{}{}

}

if !config.checkLabel(label.GetName()) {

disabledLabels[label.GetName()] = struct{}{}

}

// Remove any labels that are disabled.

newLabels := filterSlice(setLabels.Labels, func(label string) bool {

_, ok := disabledLabels[label]

return !ok

})

repoLabelsMap := make(map[string]struct{})

for _, label := range repoLabels {

repoLabelsMap[label.GetName()] = struct{}{}

}

log := s.Log.With(

"repo", req.User+"/"+req.Repo,

"issue", req.Issue,

)

// Remove any labels that are not defined by the repo.

// Sometimes the model returns labels in a

// space delimited string. For example, "bug critical" instead of

// ["bug", "critical"]. It's better to be safe and not accidentally

// create new labels.

newLabels = filterSlice(newLabels, func(label string) bool {

_, ok := repoLabelsMap[label]

if !ok {

log.Warn("label not found", "label", label)

}

return ok

})

return &InferResponse{

SetLabels: newLabels,

TokensUsed: resp.Usage.TotalTokens,

DisabledLabels: maps.Keys(disabledLabels),

}, nil

}

func (s *Webhook) infer(w http.ResponseWriter, r *http.Request) *httpjson.Response {

var (

installID = r.URL.Query().Get("install_id")

user = r.URL.Query().Get("user")

repo = r.URL.Query().Get("repo")

issue = r.URL.Query().Get("issue")

)

if user == "" || repo == "" || issue == "" || installID == "" {

return &httpjson.Response{

Status: http.StatusBadRequest,

Body: httpjson.M{"error": "install_id, user, repo, and issue are required"},

}

issueNum, err := strconv.Atoi(issue)

if err != nil {

return &httpjson.Response{

Status: http.StatusBadRequest,

Body: httpjson.M{"error": "issue must be a number"},

}

resp, err := s.Infer(r.Context(), &InferRequest{

InstallID: installID,

User: user,

Repo: repo,

Issue: issueNum,

})

if err != nil {

return httpjson.ErrorMessage(http.StatusInternalServerError, err)

}

return &httpjson.Response{

Status: http.StatusOK,

Body: resp,

}

func (s *Webhook) serverError(msg error) *httpjson.Response {

s.Log.Error("server error", "error", msg)

return &httpjson.Response{

Status: http.StatusInternalServerError,

Body: httpjson.M{"error": msg.Error()},

}

func (s *Webhook) webhook(w http.ResponseWriter, r *http.Request) *httpjson.Response {

hook, err := githook.New()

if err != nil {

if errors.Is(err, githook.ErrEventNotSpecifiedToParse) {

return &httpjson.Response{

Status: http.StatusOK,

Body: httpjson.M{"msg": "ignoring event: not specified to parse"},

}

return s.serverError(err)

}

payloadAny, err := hook.Parse(

r, githook.IssuesEvent,

)

if err != nil {

return s.serverError(err)

}

payload, ok := payloadAny.(githook.IssuesPayload)

if !ok {

return s.serverError(fmt.Errorf("expected issues payload: %T", payloadAny))

}

if payload.Action != "opened" && payload.Action != "reopened" {

return &httpjson.Response{

Status: http.StatusOK,

Body: httpjson.M{"message": "not an opened issue"},

}

repo := payload.Repository

resp, err := s.Infer(r.Context(), &InferRequest{

InstallID: strconv.FormatInt(payload.Installation.ID, 10),

User: repo.Owner.Login,

Repo: repo.Name,

Issue: int(payload.Issue.Number),

})

if err != nil {

return s.serverError(fmt.Errorf("infer: %w, issue: %+v", err, payload.Issue.URL))

}

if len(resp.SetLabels) == 0 {

return &httpjson.Response{

Status: http.StatusOK,

Body: httpjson.M{"message": "no labels to set"},

}

// Set the labels.

instConfig, err := s.AppConfig.InstallationConfig(strconv.FormatInt(payload.Installation.ID, 10))

if err != nil {

return s.serverError(err)

}

githubClient := github.NewClient(instConfig.Client(r.Context()))

_, _, err = githubClient.Issues.AddLabelsToIssue(

r.Context(),

repo.Owner.Login,

repo.Name,

int(payload.Issue.Number),

resp.SetLabels,

)

if err != nil {

return s.serverError(fmt.Errorf("set %v: %w", resp.SetLabels, err))

}

log := s.Log.With(

"install_id", payload.Installation.ID,

"user", repo.Owner.Login,

"repo", repo.Name,

"issue_num", payload.Issue.Number,

"issue_url", payload.Issue.HTMLURL,

)

log.Info("labels set",

"labels", resp.SetLabels,

"tokens_used", resp.TokensUsed,

)

return &httpjson.Response{

Status: http.StatusOK,

Body: httpjson.M{"message": "labels set", "labels": resp.SetLabels},

}

labeler/webhook.go at main · coder/labeler · GitHub

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