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package e2e
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import (
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"bytes"
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"context"
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"encoding/json"
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"net/http"
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"os/exec"
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"strings"
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"testing"
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"github.com/barerepo/server/internal/token"
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// Chapter 25 budgets any page with no diff at 15kb, and a build log is the thing that can break it.
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func TestALongBuildLogDoesNotBreakTheRunPage(t *testing.T) {
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if _, err := exec.LookPath("git"); err != nil {
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t.Skip("git is not installed")
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in := newInstance(t)
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john := in.account("john")
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work := seed(t, in, john, "john", "johnbot")
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sha := strings.TrimSpace(run(t, work, "git", "rev-parse", "HEAD"))
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jobID, runnerToken := jobOn(t, in, "john", "john/johnbot", sha)
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// A build that says a lot, which is what a real one does when it fails.
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var log strings.Builder
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for i := 0; i < 4000; i++ {
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log.WriteString("go: downloading example.com/some/module v1.2.3\n")
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log.WriteString("store/db.go:14:2: cannot find module providing package\n")
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body, err := json.Marshal(map[string]any{
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"token": runnerToken, "job_id": jobID, "chunk": log.String(),
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})
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if err != nil {
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t.Fatal(err)
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resp, err := http.Post(in.http.URL+"/runner/log", "application/json", bytes.NewReader(body))
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if err != nil {
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t.Fatal(err)
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resp.Body.Close()
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finish(t, in, runnerToken, jobID, 1)
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code, _, page := get(t, in.http.URL+"/john/johnbot/run/"+sha)
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if code != http.StatusOK {
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t.Fatalf("the run page answered %d", code)
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if len(page) > 15<<10 {
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t.Errorf("the run page sent %dkb, over chapter 25's 15kb", len(page)>>10)
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// The end of a log is where the failure is, so that is the end that stays.
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if !strings.Contains(page, "cannot find module providing package") {
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t.Error("the page cut off the line the reader came for")
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if !strings.Contains(page, "the whole log") {
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t.Error("the page does not offer the rest of the log it cut")
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// jobOn queues and takes a job for one real commit, which is what the run page can then find.
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func jobOn(t *testing.T, in *instance, account, repo, sha string) (int64, string) {
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t.Helper()
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ctx := context.Background()
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runnerToken, tok, err := in.db.CreateToken(ctx, token.Runner, account, repo, "a runner")
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if err != nil {
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t.Fatal(err)
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runner, err := in.db.AttachRunner(ctx, tok.ID, repo, "uproar.local", "linux", "amd64", nil)
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if err != nil {
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t.Fatal(err)
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if _, err := in.db.QueueJob(ctx, repo, "refs/heads/master", sha, "go build", ""); err != nil {
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t.Fatal(err)
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job, err := in.db.TakeJob(ctx, repo, *runner)
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if err != nil || job == nil {
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t.Fatalf("the runner could not take the job: %v", err)
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return job.ID, runnerToken