python - 如何解决 Telegraf 中的此错误？

Question

我有一个自定义的 python 插件，用于将数据拉入 Telegraf。它按预期打印出线路协议(protocol)输出。
在我的 Ubuntu 18.04 环境中，当这个插件运行时，我在我的日志中看到一行:

2020-12-28T21:55:00Z E! [inputs.exec] Error in plugin: exec: exit status 1 for command '/my_company/plugins-enabled/plugin-mysystem/poll_mysystem.py': Traceback (most recent call last):...

这就对了。我不知道如何获得实际的回溯。
如果我运行 sudo -u telegraf /usr/bin/telegraf -config /etc/telegraf/telegraf.conf ，插件按预期工作。它完全按照应有的方式轮询和加载数据。
当 Telegraf 自行执行插件时，我不确定如何解决此错误。
我已经重新启动了 Telegraf 服务。我已经验证了权限(我认为上面的执行表明它应该可以工作)。
根据收到的评论和答案提供了一些额外的细节:

该插件位于一个目录中，其中整个结构归 telegraf:telegraf 所有。 .该错误似乎并不表示它无法看到正在执行的文件，而是当 Telegraf 执行插件时文件中的某些内容失败了。

插件代码如下。

插件代码( /my_company/plugins-enabled/plugin-mysystem/poll_mysystem.py ):

from google.auth.transport.requests import Request
from google.oauth2 import id_token
import requests
import os

RUNTIME_URL = INTERNAL_URL
MEASUREMENT = "MY_MEASUREMENT"
CREDENTIALS = "GOOGLE_SERVICE_FILE.json"
os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = CREDENTIALS  # ENV VAR REQUIRED BY GOOGLE CODE BELOW
CLIENT_ID = VALUE_FROM_GOOGLE

exclude_fields = ["name", "version"] # Don't try to put these into influxdb from json response

def make_iap_request(url, client_id, method="GET", **kwargs):
    # Code provided by Google docs
    # Set the default timeout, if missing
    if "timeout" not in kwargs:
        kwargs["timeout"] = 90

    # Obtain an OpenID Connect (OIDC) token from metadata server or using service
    # account.
    open_id_connect_token = id_token.fetch_id_token(Request(), client_id)

    # Fetch the Identity-Aware Proxy-protected URL, including an
    # Authorization header containing "Bearer " followed by a
    # Google-issued OpenID Connect token for the service account.
    resp = requests.request(method, url, headers={"Authorization": "Bearer {}".format(open_id_connect_token)}, **kwargs)
    if resp.status_code == 403:
        raise Exception("Service account does not have permission to " "access the IAP-protected application.")
    elif resp.status_code != 200:
        raise Exception(
            "Bad response from application: {!r} / {!r} / {!r}".format(resp.status_code, resp.headers, resp.text)
        )
    else:
        return resp.json()


def print_results(results):
    """
    Take the results of a Dolores call and print influx line protocol results
    """
    for item in results["workflow"]:
        line_protocol_line_base = f"{MEASUREMENT},name={item['name']}"
        values = ""
        for key, value in item.items():
            if key not in exclude_fields:
                values = values + f",{key}={value}"
        values = values[1:]
        line_protocol_line = f"{line_protocol_line_base} {values}"
        print(line_protocol_line)


def main():
    current_runtime = make_iap_request(URL, CLIENT_ID, timeout=30)
    print_results(current_runtime)


if __name__== "__main__":
    main()

telegraf.conf的相关部分文件:

[[inputs.exec]]
  ## Commands array
  commands = [
    "/my_company/plugins-enabled/plugin-*/poll_*.py",
  ]

配置文件的代理部分

[agent]
  interval = "60s"
  round_interval = true
  metric_batch_size = 1000
  metric_buffer_limit = 10000
  collection_jitter = "0s"
  flush_interval = "10s"
  flush_jitter = "0s"
  precision = ""
  debug = false
  quiet = false
  logfile = "/var/log/telegraf/telegraf.log"
  hostname = ""
  omit_hostname = true

我接下来该怎么做？

Answer 1

exec插件在换行符处截断您的异常消息。如果您结束对 make_iap_request 的调用在 try/except 块中，然后 print(e, file=sys.stderr)与其让异常一直冒泡，不如告诉你更多。

def main():
    """
    Query URL and print line protocol
    """
    try:
        current_runtime = make_iap_request(URL, CLIENT_ID, timeout=30)
        print_results(current_runtime)
    except Exception as e:
        print(e, file=sys.stderr)

或者，您的脚本可以将错误消息记录到它自己的日志文件中，而不是将它们传回 Telegraf。这将使您更好地控制记录的内容。
我怀疑您遇到了环境问题，您的运行方式有所不同。如果不是权限，则可能是环境变量差异。