github.com/shashidharatd/test-infra@v0.0.0-20171006011030-71304e1ca560/mungegithub/github/status_change.go (about)

     1  /*
     2  Copyright 2016 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package github
    18  
    19  import (
    20  	"sync"
    21  
    22  	"k8s.io/kubernetes/pkg/util/sets"
    23  )
    24  
    25  // StatusChange keeps track of issue/commit for status changes
    26  type StatusChange struct {
    27  	heads        map[int]string      // Pull-Request ID -> head-sha
    28  	pullRequests map[string]sets.Int // head-sha -> Pull-Request IDs
    29  	changed      sets.String         // SHA of commits whose status changed
    30  	mutex        sync.Mutex
    31  }
    32  
    33  // NewStatusChange creates a new status change tracker
    34  func NewStatusChange() *StatusChange {
    35  	return &StatusChange{
    36  		heads:        map[int]string{},
    37  		pullRequests: map[string]sets.Int{},
    38  		changed:      sets.NewString(),
    39  	}
    40  }
    41  
    42  // UpdatePullRequestHead updates the head commit for a pull-request
    43  func (s *StatusChange) UpdatePullRequestHead(pullRequestID int, newHead string) {
    44  	s.mutex.Lock()
    45  	defer s.mutex.Unlock()
    46  
    47  	if oldHead, has := s.heads[pullRequestID]; has {
    48  		delete(s.pullRequests, oldHead)
    49  	}
    50  	s.heads[pullRequestID] = newHead
    51  	if _, has := s.pullRequests[newHead]; !has {
    52  		s.pullRequests[newHead] = sets.NewInt()
    53  	}
    54  	s.pullRequests[newHead].Insert(pullRequestID)
    55  }
    56  
    57  // CommitStatusChanged must be called when the status for this commit has changed
    58  func (s *StatusChange) CommitStatusChanged(commit string) {
    59  	s.mutex.Lock()
    60  	defer s.mutex.Unlock()
    61  
    62  	s.changed.Insert(commit)
    63  }
    64  
    65  // PopChangedPullRequests returns the list of issues changed since last call
    66  func (s *StatusChange) PopChangedPullRequests() []int {
    67  	s.mutex.Lock()
    68  	defer s.mutex.Unlock()
    69  
    70  	changedPullRequests := sets.NewInt()
    71  	for _, commit := range s.changed.List() {
    72  		if pullRequests, has := s.pullRequests[commit]; has {
    73  			changedPullRequests = changedPullRequests.Union(pullRequests)
    74  		}
    75  	}
    76  	s.changed = sets.NewString()
    77  
    78  	return changedPullRequests.List()
    79  }