为什么我的Golang频道会永远阻止写入？

Here’s原始代码(master branch).

Here’s具有并发性的分支(x_concurrent分支).

当我使用go run jira_open_comment_emailer.go执行并发代码时,如果将JIRA问题添加到通道here中,则延迟wg.Done()永远不会执行,这会导致我的wg.Wait()永久挂起.

这个想法是我有大量的JIRA问题,我想为每个问题分拆一个goroutine,看看它是否有我需要回应的评论.如果是这样,我想将它添加到某个结构(我在一些研究后选择了一个频道),我可以稍后从队列中读取以构建电子邮件提醒.

这是代码的相关部分：

// Given an issue,determine if it has an open comment
// Returns true if there is an open comment on the issue,otherwise false
func getAndProcessComments(issue Issue,channel chan<- Issue,wg *sync.WaitGroup) {
    // Decrement the wait counter when the function returns
    defer wg.Done()

    needsReply := false

    // Loop over the comments in the issue
    for _,comment := range issue.Fields.Comment.Comments {
        commentMatched,err := regexp.MatchString("~"+config.JIRAUsername,comment.Body)
        checkError("Failed to regex match against comment body",err)

        if commentMatched {
            needsReply = true
        }

        if comment.Author.Name == config.JIRAUsername {
            needsReply = false
        }
    }

    // Only add the issue to the channel if it needs a reply
    if needsReply == true {
        // This never allows the defered wg.Done() to execute?
        channel <- issue
    }
}

func main() {
    start := time.Now()

    // This retrieves all issues in a search from JIRA
    allIssues := getFullIssueList()

    // Initialize a wait group
    var wg sync.WaitGroup

    // Set the number of waits to the number of issues to process
    wg.Add(len(allIssues))

    // Create a channel to store issues that need a reply
    channel := make(chan Issue)

    for _,issue := range allIssues {
        go getAndProcessComments(issue,channel,&wg)
    }

    // Block until all of my goroutines have processed their issues.
    wg.Wait()

    // Only send an email if the channel has one or more issues
    if len(channel) > 0 {
        sendEmail(channel)
    }

    fmt.Printf("Script ran in %s",time.Since(start))
}