介绍

lg_pod_plugin 是一个 ruby gem, 基于 cocoapods 开发, 实现了 pod 预下载功能.

lg_pod_plugin 使用 gitlab api 来下载 gitlab 仓库代码, 只将 gitlab 账号信息保存在本地, 并不会泄露你的 gitlab 账户信息.

lg_pod_plugin 利用Swift Asnyc 多线程技术进行并发下载, 多任务下载能够有效利用网络资源, 从而减少下载 Pod 花费的时间.

lg_pod_plugin 使用 Github 加速功能, 下载单个 commit 对应的压缩文件包, 减少 git clone 速度慢的问题.

只提供了预下载功能, 没有修改 cocoapods 源码, 不影响 pod install | update 执行流程, 无侵入式设计, 不需要对现有项目进行改动.

原理

项目整体流程

项目下载流程

缓存路径计算方法: 根据下载参数进行 hash 运算, 生产一个文件路径

开发版本 external pod 文件路径示意图

Release pod 文件路径示意图

文件路径生成算法

def slug(name: self.name, params: self.params, spec: self.spec)
  checksum = spec && spec.checksum && '-' << spec.checksum[0, 5]
  if released_pod?
    "Release/#{name}/#{spec.version}#{checksum}"
  else
    opts = params.to_a.sort_by(&:first).map { |k, v| "#{k}=#{v}" }.join('-')
    digest = Digest::MD5.hexdigest(opts)
    "External/#{name}/#{digest}#{checksum}"
  end
end

git & branch

pod "AFNetworking", :git => 'https://github.com/AFNetworking/AFNetworking.git', :branch => 'master'
下载前参数:
{"commit": "c29d3d09e5f1ba5ec7265bbdf097eac977071d39", "git": "https://github.com/AFNetworking/AFNetworking.git"} 
下载后参数
{"commit": "c29d3d09e5f1ba5ec7265bbdf097eac977071d39", "git": "https://github.com/AFNetworking/AFNetworking.git"}

git & tag

pod "AFNetworking", :git => ''https://github.com/AFNetworking/AFNetworking.git', :tag => '0.2.0'
下载前参数:
{ "git" : "'https://github.com/AFNetworking/AFNetworking.git", "tag" "0.2.0"}
下载后参数
{ "git" : "'https://github.com/AFNetworking/AFNetworking.git", "tag" "0.2.0"}

git & commit

pod "AFNetworking", :git => 'https://github.com/AFNetworking/AFNetworking.git', :commit => 'c29d3d09e5f1ba5ec7265bbdf097eac977071d39'
下载前参数:
{"commit": "c29d3d09e5f1ba5ec7265bbdf097eac977071d39", "git": "https://github.com/AFNetworking/AFNetworking.git"} 
下载后参数
{"commit": "c29d3d09e5f1ba5ec7265bbdf097eac977071d39", "git": "https://github.com/AFNetworking/AFNetworking.git"}

http

pod 'AlicloudPush', '1.9.9.7'
下载前参数:
{"http": "https://ios-repo.oss-cn-shanghai.aliyuncs.com/push/1.9.9.7/push.zip"}
下载后参数:
{"http": "https://ios-repo.oss-cn-shanghai.aliyuncs.com/push/1.9.9.7/push.zip"}

判断Pod 缓存是否存在

public
def pod_cache_exist(name, options, spec = nil, released_pod = false)
  destination, cache_pod_spec = self.find_pod_cache name, options, spec, released_pod
  if (File.exist?(destination) && !destination.children.empty?) && cache_pod_spec.exist?
    return [true, destination, cache_pod_spec]
  else
    return [false, destination, cache_pod_spec]
  end
end

#判断缓存是否存在且有效命中缓存
public
def find_pod_cache(name, options, spec = nil, released_pod = false)
  hash_map = Hash.new.merge!(options)
  if hash_map.has_key?(:version)
    hash_map.delete(:version)
  end
  request = LCache.download_request(name, hash_map, spec, released_pod)
  destination = LCache.path_for_pod(request, {})
  cache_pod_spec = LCache.path_for_spec(request, {})
  [destination, cache_pod_spec]
end

#MARK - 判断 Pod 缓存是否存在
def self.path_for_pod(request, slug_opts = {})
  root = self.root_path
  root + request.slug(**slug_opts)
end

#MARK - 判断 PodSpec 文件是否存在
def self.path_for_spec(request, slug_opts = {})
  root = self.root_path
  path = root + 'Specs' + request.slug(**slug_opts)
  Pathname.new(path.to_path + '.podspec.json')
end