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github.go
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github.go
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package main
import (
"bytes"
"context"
"encoding/json"
"fmt"
"html/template"
"io"
"net/http"
"strconv"
"strings"
"time"
"golang.org/x/sync/errgroup"
)
var (
githubURL = "https://api.github.com/graphql"
)
type project struct {
Name string `json:"nameWithOwner"`
URL string `json:"url"`
ForkCount int `json:"forkCount"`
IsFork bool `json:"isFork"`
IsArchived bool `json:"isArchived"`
IsInOrganization bool `json:"isInOrganization"`
StargazerCount int `json:"StargazerCount"`
}
type rateLimitStats struct {
limit int
remaining int
resetTime time.Time
}
func getRateLimitStats(ctx context.Context, token string) (*rateLimitStats, error) {
req, err := http.NewRequestWithContext(ctx, "HEAD", githubURL, nil)
req.Header.Add("Authorization", "Bearer "+token)
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
limit, err := strconv.Atoi(resp.Header.Get("X-RateLimit-Limit"))
if err != nil {
return nil, err
}
remaining, err := strconv.Atoi(resp.Header.Get("X-RateLimit-Remaining"))
if err != nil {
return nil, err
}
rawResetTime, err := strconv.ParseInt(resp.Header.Get("X-RateLimit-Reset"), 10, 64)
if err != nil {
return nil, err
}
resetTime := time.Unix(rawResetTime, 0)
return &rateLimitStats{
limit: limit,
remaining: remaining,
resetTime: resetTime,
}, nil
}
func containsProject(ps []project, lookupProject project) bool {
for _, p := range ps {
if p.Name == lookupProject.Name {
return true
}
}
return false
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
// getAllProjects splits projectIDs into chunks which Github should be able to handle
func getAllProjects(ctx context.Context, projectIDs []string, token string) ([]project, error) {
// somewhere between 2125 and 2250 is the limit from what Github can handle.
// If we try to query more than that Github returns a HTTP 500 error.
// To hopefully be safe we reduce the chunk size to 2000.
chunkSize := 2000
errGroup, ctx := errgroup.WithContext(ctx)
projects := make(chan project)
for i := 0; i < len(projectIDs); i += chunkSize {
batch := projectIDs[i:min(i+chunkSize, len(projectIDs))]
errGroup.Go(func() error {
ps, err := getProjects(ctx, batch, token)
if err != nil {
return err
}
for _, p := range ps {
projects <- p
}
return nil
})
}
go func() {
errGroup.Wait()
close(projects)
}()
result := []project{}
for project := range projects {
// different owner/name pairs can point to the same github project due to redirects.
// e.g. peterbourgon/gokit -> go-kit/kit
if containsProject(result, project) {
continue
}
result = append(result, project)
}
if err := errGroup.Wait(); err != nil {
return nil, err
}
return result, nil
}
// getProjects returns a list of projects for all projectIDs in the form OWNER/REPO
func getProjects(ctx context.Context, projectIDs []string, token string) ([]project, error) {
query, err := buildQuery(projectIDs)
if err != nil {
return nil, err
}
type Request struct {
Query string `json:"query"`
}
payload, err := json.Marshal(&Request{query})
if err != nil {
return nil, err
}
req, err := http.NewRequestWithContext(ctx, "POST", githubURL, bytes.NewBuffer(payload))
req.Header.Add("Authorization", "Bearer "+token)
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
payload, err = io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("failed to read body: %w", err)
}
if resp.StatusCode > 399 {
return nil, fmt.Errorf("http request failed with status: %d. body: %s", resp.StatusCode, string(payload))
}
type Response struct {
Data map[string]project `json:"data"`
Errors []Error `json:"errors"`
}
response := &Response{}
err = json.Unmarshal(payload, response)
if err != nil {
return nil, err
}
err = ignoreNotFoundErrs(response.Errors)
if err != nil {
return nil, err
}
projects := []project{}
for _, project := range response.Data {
// In the project array we usually have a couple of uninitialized projects for
// the projects we could not find on Github. Most likely projects which do no
// longer exist or are private.
if project.Name == "" {
continue
}
projects = append(projects, project)
}
return projects, nil
}
type Error struct {
Message string `json:"message"`
Type string `json:"type"`
}
func ignoreNotFoundErrs(errs []Error) error {
realErrs := []Error{}
for _, e := range errs {
if e.Type == "NOT_FOUND" {
continue
}
realErrs = append(realErrs, e)
}
if len(realErrs) != 0 {
return fmt.Errorf("query failed. errors: %d. first error: %s", len(realErrs), realErrs[0].Message)
}
return nil
}
var queryTemplate = `{
{{ range . }}
{{ .Alias }}: repository(name: "{{ .Name }}", owner: "{{ .Owner }}") {nameWithOwner url forkCount isFork isArchived isInOrganization stargazerCount}
{{- end }}
}`
func buildQuery(projectIDs []string) (string, error) {
type project struct {
Alias string
Name string
Owner string
}
projects := []project{}
for i, projectID := range projectIDs {
parts := strings.Split(projectID, "/")
if len(parts) != 2 {
return "", fmt.Errorf("projectID format error. got '%s' expects 'OWNER/REPONAME'", projectID)
}
projects = append(projects, project{
Alias: "_" + strconv.Itoa(i),
Name: parts[1],
Owner: parts[0],
})
}
t, err := template.New("query").Parse(queryTemplate)
if err != nil {
return "", err
}
buf := &bytes.Buffer{}
err = t.Execute(buf, &projects)
if err != nil {
return "", err
}
return buf.String(), nil
}