Module: Mbeditor::GitInfoService

Defined in:
app/services/mbeditor/git_info_service.rb

Constant Summary collapse

CACHE_TTL =

How long a computed payload stays fresh. Must exceed the frontend's lite-poll interval (5s) so steady-state polls never trigger the full multi-subprocess fan-out below.

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Class Method Summary collapse

Class Method Details

.cached_git_info(repo_path, ttl: CACHE_TTL) ⇒ Object 



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# File 'app/services/mbeditor/git_info_service.rb', line 191

def cached_git_info(repo_path, ttl: CACHE_TTL)
  GIT_INFO_MUTEX.synchronize do
    cache = @git_info_cache || {}
    entry = cache[repo_path]
    return entry[:data] if entry && (Process.clock_gettime(Process::CLOCK_MONOTONIC) - entry[:ts]) < ttl
  end
  nil
end

.call(repo_path) ⇒ Object 



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# File 'app/services/mbeditor/git_info_service.rb', line 17

def call(repo_path)
  cached = cached_git_info(repo_path)
  return cached if cached

  flight = nil
  GIT_INFO_MUTEX.synchronize do
    @git_info_flights ||= {}
    flight = @git_info_flights[repo_path]
    @git_info_flights[repo_path] = Queue.new unless flight
  end

  if flight
    # Another thread is already running the fan-out; don't duplicate it.
    stale = stale_git_info(repo_path)
    return stale if stale

    # The owner closes this queue when it is done, which releases every
    # waiter at once. Waiting on the owner *thread* was the old mechanism,
    # but a Puma pool thread never exits, so join always ran to CACHE_TTL.
    begin
      Timeout.timeout(CACHE_TTL) { flight.pop }
    rescue Timeout::Error
      nil
    end
    return cached_git_info(repo_path) || stale_git_info(repo_path) ||
           { ok: false, error: "git info computation in progress" }
  end

  begin
    compute(repo_path)
  ensure
    done = GIT_INFO_MUTEX.synchronize { @git_info_flights.delete(repo_path) }
    done&.close
  end
end

.compute(repo_path) ⇒ Object 



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# File 'app/services/mbeditor/git_info_service.rb', line 53

def compute(repo_path)
  branch = GitService.current_branch(repo_path)
  unless branch
    return stale_or_error(repo_path, "Unable to determine current branch")
  end

  # Wave 1: all independent git reads run in parallel
  # -z on both: it is the only form that leaves paths with spaces or
  # non-ASCII bytes unquoted, and the two lists are paired by path below.
  status_t   = Thread.new { safe_git(repo_path, "status", "--porcelain", "-z") }
  numstat_t  = Thread.new { safe_git(repo_path, "diff", "--numstat", "-z", "HEAD") }
  upstream_t = Thread.new { safe_git(repo_path, "rev-parse", "--abbrev-ref", "--symbolic-full-name", "@{u}") }
  base_t     = Thread.new { GitService.find_branch_base(repo_path, branch) }

  working_output, working_ok = status_t.value
  working_tree = working_ok ? GitService.parse_porcelain_status(working_output) : []

  numstat_out, = numstat_t.value
  numstat_map = GitService.parse_numstat(numstat_out)
  working_tree = working_tree.map { |f| f.merge(numstat_map.fetch(f[:path], {})) }

  upstream_output, upstream_ok = upstream_t.value
  upstream_branch = upstream_ok ? upstream_output.strip : nil
  upstream_branch = nil unless upstream_branch&.match?(GitService::SAFE_GIT_REF)

  base_sha, base_ref = base_t.value

  ahead_count    = 0
  behind_count   = 0
  unpushed_files = []
  unpushed_commits = []
  diff_base = base_sha || upstream_branch

  # Wave 2: conditional parallel reads that depend on Wave 1 results
  wave2 = {}
  wave2[:counts]    = Thread.new { safe_git(repo_path, "rev-list", "--left-right", "--count", "HEAD...#{upstream_branch}") } if upstream_branch.to_s != ""
  wave2[:unp_log]   = Thread.new { safe_git(repo_path, "log", "#{upstream_branch}..HEAD", "--pretty=format:%H%x1f%s%x1f%an%x1f%aI%x1e") } if upstream_branch.to_s != ""
  wave2[:diff_name] = Thread.new { safe_git(repo_path, "diff", "--name-status", "#{diff_base}..HEAD") } if diff_base.to_s != ""
  wave2[:diff_num]  = Thread.new { safe_git(repo_path, "diff", "--numstat", "#{diff_base}..HEAD") } if diff_base.to_s != ""
  wave2[:branch_log] = Thread.new do
    if base_sha
      safe_git(repo_path, "log", "--first-parent", "#{base_sha}..HEAD",
               "--pretty=format:%H%x1f%s%x1f%an%x1f%aI%x1e")
    else
      safe_git(repo_path, "log", "--first-parent", branch, "-n", "100",
               "--pretty=format:%H%x1f%s%x1f%an%x1f%aI%x1e")
    end
  end

  wave2.each_value(&:join)

  if (ct = wave2[:counts])
    counts_output, counts_ok = ct.value
    if counts_ok
      ahead_str, behind_str = counts_output.strip.split("\t", 2)
      ahead_count  = ahead_str.to_i
      behind_count = behind_str.to_i
    end
  end

  if (ul = wave2[:unp_log])
    unpushed_log_output, unpushed_log_ok = ul.value
    unpushed_commits = GitService.parse_git_log(unpushed_log_output) if unpushed_log_ok
  end

  if (dn = wave2[:diff_name]) && (dnum = wave2[:diff_num])
    diff_name_out, diff_name_ok = dn.value
    if diff_name_ok
      unpushed_files  = GitService.parse_name_status(diff_name_out)
      unp_numstat_out = dnum.value.first
      unp_numstat_map = GitService.parse_numstat(unp_numstat_out)
      unpushed_files  = unpushed_files.map { |f| f.merge(unp_numstat_map.fetch(f[:path], {})) }
    end
  end

  branch_log_output, branch_log_ok = wave2[:branch_log].value
  branch_commits = branch_log_ok ? GitService.parse_git_log(branch_log_output) : []

  redmine_ticket_id = nil
  if Mbeditor.configuration.redmine_enabled
    if Mbeditor.configuration.redmine_ticket_source == :branch
      m = branch.match(/\A(\d+)/)
      redmine_ticket_id = m[1] if m
    else
      branch_commits.each do |commit|
        m = commit["title"]&.match(/#(\d+)/)
        if m
          redmine_ticket_id = m[1]
          break
        end
      end
    end
  end

  payload = {
    ok: true,
    branch: branch,
    upstreamBranch: upstream_branch,
    ahead: ahead_count,
    behind: behind_count,
    workingTree: working_tree,
    unpushedFiles: unpushed_files,
    unpushedCommits: unpushed_commits,
    branchCommits: branch_commits,
    branchBaseRef: base_ref,
    # The merge-base sha the unpushedFiles list was actually computed
    # against. The frontend needs this to diff an individual file against
    # the same baseline — passing the ref name would compare the file to
    # the tip of the base branch, and passing the upstream would compare
    # the branch to itself.
    branchBaseSha: diff_base,
    redmineTicketId: redmine_ticket_id
  }
  store_git_info(repo_path, payload)
  payload
rescue StandardError => e
  stale_or_error(repo_path, e.message)
end

.invalidate(repo_path) ⇒ Object 



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# File 'app/services/mbeditor/git_info_service.rb', line 183

def invalidate(repo_path)
  GIT_INFO_MUTEX.synchronize do
    cache = @git_info_cache || {}
    cache.delete(repo_path)
    @git_info_cache = cache
  end
end

.safe_git(repo_path, *args) ⇒ Object

Run a git command via GitService.run_git (which honors config.git_timeout through ProcessRunner). Returns [stdout, ok]; a timed-out or failed call degrades to ["", false] so one slow subprocess only blanks its own field instead of failing the whole payload.



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# File 'app/services/mbeditor/git_info_service.rb', line 176

def safe_git(repo_path, *args)
  out, status = GitService.run_git(repo_path, *args)
  [out, status.success?]
rescue StandardError
  ["", false]
end

.stale_git_info(repo_path) ⇒ Object

Last computed payload regardless of TTL; nil if never computed.



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# File 'app/services/mbeditor/git_info_service.rb', line 201

def stale_git_info(repo_path)
  GIT_INFO_MUTEX.synchronize do
    entry = (@git_info_cache || {})[repo_path]
    return entry[:data].merge(stale: true) if entry
  end
  nil
end

.stale_or_error(repo_path, message) ⇒ Object 



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# File 'app/services/mbeditor/git_info_service.rb', line 209

def stale_or_error(repo_path, message)
  stale_git_info(repo_path) || { ok: false, error: message }
end

.store_git_info(repo_path, data) ⇒ Object 



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# File 'app/services/mbeditor/git_info_service.rb', line 213

def store_git_info(repo_path, data)
  GIT_INFO_MUTEX.synchronize do
    cache = @git_info_cache || {}
    cache[repo_path] = { ts: Process.clock_gettime(Process::CLOCK_MONOTONIC), data: data }
    @git_info_cache = cache
  end
end