'JSON.parse' 错误处理无效/非 JSON 格式

Question

我从 HTTP 流服务请求信息。它以 JSON 格式提供数据。这里是the documentation。这是我正在使用的代码的一部分：

require 'uri'
require 'net/https'
require 'json'


uri = URI("https://api.tradier.com/v1/markets/events/session")
http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Post.new(uri.request_uri)
http.read_timeout = 30
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_PEER

# Headers

request["Accept"] = "application/json"
request["Authorization"] = "Bearer xxx"

# Send synchronously

response = http.request(request)

# parses response

parse = JSON.parse(response.body)

#out puts values only from response

sessionid = parse.values[0]["sessionid"]
url = parse.values[0]["url"]


uri = URI("#{url}?sessionid=#{sessionid}&symbols=aapl")
http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Post.new(uri.request_uri)
http.read_timeout = 30
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_PEER

# Headers

request["Accept"] = "application/json"
request["Authorization"] = "Bearer xxx"


http.request request do |response|
  response.read_body do |data|
    puts data.class
  #  info = JSON.parse(data, :quirks_mode => true)
  #  puts info.values
    end
end

我想让系统继续执行该程序。看来我需要使用begin 和rescue，但我无法让它们工作。当我请求数据时，我收到以下错误：

`parse': 757: '{"type":"trade","symbol":"AAPL","exch":"Q","price":"191.23","size": "1081622","cvol":"18308460","date":"1528747200000","last":"191.23"}{"type":"summary","symbol":"AAPL","open":" 191.35","high":"191.97","low":"190.21","prevClose":"191.7","close":"191.23"}' (JSON::ParserError)

Answer 1

您使用的端点记录在Tradier API docs 中，它是streaming endpoint。

似乎响应没有分块，每个块只包含一个 JSON 文档。然而，文档似乎由换行符分隔，使得响应看起来像：

{ "json": "data" }
{ "more": "data" }

这不是有效的 JSON。您可能需要通过执行以下操作一一解析它们：

http.request request do |response|
  response.read_body do |data|
    data.each_line do |chunk|
      info = JSON.parse(chunk)
      puts info.inspect
    end
  end
end

如果响应分块发生在 JSON 文档的中间，则必须使用某种缓冲阅读器。