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status.go
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/
status.go
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// Copyright 2018 Palantir Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package handler
import (
"context"
"encoding/json"
"fmt"
"strings"
"github.com/google/go-github/v61/github"
"github.com/palantir/go-githubapp/githubapp"
"github.com/palantir/policy-bot/policy/common"
"github.com/palantir/policy-bot/pull"
"github.com/pkg/errors"
)
type Status struct {
Base
}
func (h *Status) Handles() []string { return []string{"status"} }
// Handle status
// https://developer.github.com/v3/activity/events/types/#statusevent
func (h *Status) Handle(ctx context.Context, eventType, deliveryID string, payload []byte) error {
var event github.StatusEvent
if err := json.Unmarshal(payload, &event); err != nil {
return errors.Wrap(err, "failed to parse status event payload")
}
if strings.HasPrefix(event.GetContext(), h.PullOpts.StatusCheckContext) {
return h.processOwn(ctx, event)
}
if event.GetState() == "success" {
return h.processOthers(ctx, event)
}
return nil
}
func (h *Status) processOwn(ctx context.Context, event github.StatusEvent) error {
repo := event.GetRepo()
ownerName := repo.GetOwner().GetLogin()
repoName := repo.GetName()
commitSHA := event.GetCommit().GetSHA()
installationID := githubapp.GetInstallationIDFromEvent(&event)
client, err := h.NewInstallationClient(installationID)
if err != nil {
return err
}
ctx, logger := githubapp.PrepareRepoContext(ctx, installationID, repo)
sender := event.GetSender()
if sender.GetLogin() == h.AppName+"[bot]" {
return nil
}
logger.Warn().
Str(LogKeyAudit, event.GetName()).
Str(LogKeyGitHubSHA, commitSHA).
Msgf(
"Entity '%s' overwrote status check '%s' to state='%s' description='%s' targetURL='%s'",
sender.GetLogin(),
event.GetContext(),
event.GetState(),
event.GetDescription(),
event.GetTargetURL(),
)
// must be less than 140 characters to satisfy GitHub API
desc := fmt.Sprintf("'%s' overwrote status to '%s'", sender.GetLogin(), event.GetState())
// unlike in other code, use a single context here because we want to
// replace a forged context with a failure, not post a general status
// if multiple contexts are forged, we will handle multiple events
status := &github.RepoStatus{
Context: event.Context,
State: github.String("failure"),
Description: &desc,
}
_, _, err = client.Repositories.CreateStatus(ctx, ownerName, repoName, commitSHA, status)
return err
}
func (h *Status) processOthers(ctx context.Context, event github.StatusEvent) error {
repo := event.GetRepo()
ownerName := repo.GetOwner().GetLogin()
repoName := repo.GetName()
commitSHA := event.GetCommit().GetSHA()
installationID := githubapp.GetInstallationIDFromEvent(&event)
client, err := h.NewInstallationClient(installationID)
if err != nil {
return err
}
ctx, logger := githubapp.PrepareRepoContext(ctx, installationID, repo)
// In practice, there should be well under 100 PRs for a given commit. In exceptional cases, if there are
// more than 100 PRs, only process the most recent 100.
prs, _, err := client.PullRequests.ListPullRequestsWithCommit(
ctx,
ownerName,
repoName,
commitSHA,
&github.ListOptions{
PerPage: 100,
})
if err != nil {
return errors.Wrapf(err, "failed to list pull requests for SHA %s", commitSHA)
}
logger.Debug().Msgf("Context event is for '%s', found %d PRs", event.GetContext(), len(prs))
evaluationFailures := 0
for _, pr := range prs {
if pr.GetState() == "open" {
err = h.Evaluate(ctx, installationID, common.TriggerStatus, pull.Locator{
Owner: ownerName,
Repo: repoName,
Number: pr.GetNumber(),
Value: pr,
})
if err != nil {
evaluationFailures++
logger.Error().Err(err).Msgf("Failed to evaluate pull request '%d' for SHA '%s'", pr.GetNumber(),
commitSHA)
}
}
}
if evaluationFailures == 0 {
return nil
}
return errors.Errorf("failed to evaluate %d pull requests", evaluationFailures)
}