5.2. 配置

本章我们开始理解如何配置 Iroha ，让我们看看example/config.sample。

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{
  "block_store_path": "/tmp/block_store/",
  "torii_port": 50051,
  "internal_port": 10001,
  "pg_opt": "host=localhost port=5432 user=postgres password=mysecretpassword",
  "max_proposal_size": 10,
  "proposal_delay": 5000,
  "vote_delay": 5000,
  "mst_enable" : false,
  "mst_expiration_time" : 1440,
  "max_rounds_delay": 3000,
  "stale_stream_max_rounds": 2
}

正如您所见，配置文件是json结构。让我们一行一行理解这些参数的意义。

5.2.1. 部署参数

  • block_store_path: 配置存放区块(blocks)的文件夹的路径。
  • torii_port: 配置外部通信端口。请求和交易被发送到这里。
  • internal_port: 配置内部通信端口——请求服务，共识，限制下载。
  • “pg_opt” 用来配置 PostgreSQL 的相关凭据：主机、端口、用户名和密码。
  • log is an optional parameter controlling log output verbosity and format (see below).

5.2.2. 环境参数

  • max_proposal_size:在一次请求中的最大交易额，也是单个区块的大小。因此，通过改变这个数值大小，你可以改变区块大小。一开始可以定为10。但是，如果你每秒交易很多，我们建议增加这个数值。

  • proposal_delay is a timeout in milliseconds that a peer waits a response from the orderding service with a proposal.

  • vote_delay 是给下一位节点 发送投票 之前的等待毫秒时间。 其最佳时间依赖于网络中Iroha节点的数量(节点数量越多，则需要越多的``vote_delay``)。 我们推荐刚开始设置为 100-1000 毫秒。

  • mst_enable enables or disables multisignature transaction network transport in Iroha. Note that MST engine always works for any peer even when the flag is set to false. The flag only allows sharing information about MST transactions among the peers.

  • mst_expiration_time is an optional parameter specifying the time period in which a not fully signed transaction (or a batch) is considered expired (in minutes). The default value is 1440.

  • max_rounds_delay is an optional parameter specifying the maximum delay between two consensus rounds (in milliseconds). The default value is 3000. When Iroha is idle, it gradually increases the delay to reduce CPU, network and logging load. However too long delay may be unwanted when first transactions arrive after a long idle time. This parameter allows users to find an optimal value in a tradeoff between resource consumption and the delay of getting back to work after an idle period.

  • stale_stream_max_rounds is an optional parameter specifying the maximum amount of rounds to keep an open status stream while no status update is reported. The default value is 2. Increasing this value reduces the amount of times a client must reconnect to track a transaction if for some reason it is not updated with new rounds. However large values increase the average number of connected clients during each round.

  • "initial_peers is an optional parameter specifying list of peers a node will use after startup instead of peers from genesis block. It could be useful when you add a new node to the network where the most of initial peers may become malicious. Peers list should be provided as a JSON array:

    "initial_peers" : [{"address":"127.0.0.1:10001", "public_key": "bddd58404d1315e0eb27902c5d7c8eb0602c16238f005773df406bc191308929"}]

5.2.3. Logging

In Iroha logging can be adjusted as granularly as you want. Each component has its own logging configuration with properties inherited from its parent, able to be overridden through config file. This means all the component loggers are organized in a tree with a single root. The relevant section of the configuration file contains the overriding values:

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"log": {
  "level": "info",
  "patterns": {
    "debug": "don't panic, it's %v.",
    "error": "MAMA MIA! %v!!!"
  },
  "children": {
    "KeysManager": {
      "level": "trace"
    },
    "Irohad": {
      "children": {
        "Storage": {
          "level": "trace",
          "patterns": {
            "debug": "thread %t: %v."
          }
        }
      }
    }
  }
}

Every part of this config section is optional.

  • level sets the verbosity. Available values are (in decreasing verbosity order):
    • trace - print everything
    • debug
    • info
    • warning
    • error
    • critical - print only critical messages
  • patterns controls the formatting of each log string for different verbosity levels. Each value overrides the less verbose levels too. So in the example above, the “don’t panic” pattern also applies to info and warning levels, and the trace level pattern is the only one that is not initialized in the config (it will be set to default hardcoded value).
  • children describes the overrides of child nodes. The keys are the names of the components, and the values have the same syntax and semantics as the root log configuration.