Jenkins - Get Artifacts with REST API

Problem

為了節省軟體的反安裝、下載與安裝時間，我們有隻script，會去jenkins抓某個固定位置的最新安裝程式並安裝。然而，開發過程會因為新功能或修bug等原因產生branch；原本的腳本並無法根據branch去下載安裝程式，也因此花了些時間去研究並解決這個問題。

How to?

jenkins既然有RestAPI，應該就有辦法讓人可以存取到它專案相關資訊吧? 為了達到我們目的，其中會包含幾個步驟:

取得專案build列表。
取得branch吻合的build URL。
取得此build的artifact列表。
過濾想要的artifacts。

以專案名稱Example為例，其專案的URL為:

http://tonylin.idv/job/Example

取得專案build列表

首先可以透過此URL去搜尋所有build資訊:

http://tonylin.idv/job/Example/api/json?tree=builds[*]

以一個build的結果如下:

{
  "builds": [
  {
  "actions": [
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {}
  ],
  "artifacts": [
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {},
  {}
  ],
  "building": false,
  "description": "origin/integration_testing",
  "displayName": "#6611",
  "duration": 375922,
  "estimatedDuration": 366451,
  "executor": null,
  "fullDisplayName": "Example #6611",
  "id": "6611",
  "keepLog": true,
  "number": 6611,
  "queueId": 335,
  "result": "SUCCESS",
  "timestamp": 1481712191068,
  "url": "http://tonylin.idv/job/Example/6611/",
  "builtOn": "",
  "changeSet": {},
  "culprits": [
  {},
  {},
  {},
  {},
  {},
  {}
  ],
  "fingerprint": []
  }
]
}

取得branch吻合的build URL

由於前一個URL使用[*]是列出所有項目，但其實我們只需要知道branch、build結果、build URL與build number，可以透過以下URL去做query:

http://tonylin.idv/job/Example/api/json?tree=builds[description,result,displayName,url]

三個build的輸出結果如下，從結果內容不難得知個別資訊意義，需注意的是master的description會是null或master(我們使用dscription當branch名稱):

{
  "builds": [
  {
  "description": "origin/integration_testing",
  "displayName": "#6611",
  "result": "SUCCESS",
  "url": "http://tonylin.idv/job/Example/6611/"
  },
  {
  "description": "origin/fix_memory_leak",
  "displayName": "#6610",
  "result": "SUCCESS",
  "url": "http://tonylin.idv/job/Example/6610/"
  },
  {
  "description": null,
  "displayName": "#6583",
  "result": "SUCCESS",
  "url": "http://tonylin.idv/job/Example/6583/"
  }
]
}

取得此build的artifact列表

從前一次query結果，以origin/integration_testing為例，我們需要的build URL為:

http://tonylin.idv/job/Example/6611/

接著我們可以透過以下URL去query artifacts，我需要的是檔案名稱與檔案下載路徑:

http://tonylin.idv/job/Example/6611/api/json?tree=artifacts[fileName,relativePath]

可以看到結果如下:

{
  "artifacts": [
  {
  "fileName": "user_guide.pdf",
  "relativePath": "dist/user_guide.pdf"
  },
  {
  "fileName": "Example_1.0_build6611_linux_x64.bin",
  "relativePath": "dist/Example_1.0_build6611_linux_x64.bin"
  },
  {
  "fileName": "Example_1.0_build6611_windows_x64.exe",
  "relativePath": "dist/Example_1.0_build6611_windows_x64.exe"
  }
  ]
}

接著只要根據你需要的檔案名稱做過濾後，將relativePath串到build URL就可以拿到你想要的東西了。

Sample code

針對以上過程，我用python寫了一隻範例程式給大家參考:

import requests
import json
import platform
 
 
def find_latest_build(base_url, project_name, branch=None):
    query_url = base_url + project_name + "/api/json?tree=builds[description,result,displayName,url]"
    response = requests.get(query_url)
    if response.status_code != 200:
        raise RuntimeError("request failed, status code=%d" % response.status_code)
 
    json_object = json.loads(response.content)
    found_build = None
    for build in json_object["builds"]:
        if not branch and build["description"] == "master":
            return build
        elif build["description"] == branch:
            return build
    return None
 
 
def find_installer(build_url, file_prefix):
    is_windows = platform.system() == "Windows"
    ext = ".exe" if is_windows else ".bin"
    query_url = build_url + "api/json?tree=artifacts[fileName,relativePath]"
 
    response = requests.get(query_url)
    if response.status_code != 200:
        raise RuntimeError("request failed, status code=%d" % response.status_code)
 
    json_object = json.loads(response.content)
    for artifact in json_object["artifacts"]:
        file_name = artifact["fileName"]
        if file_name.startswith(file_prefix) and file_name.endswith(ext):
            relative_path = artifact["relativePath"]
            return build_url + "artifact/" + relative_path
    return None

簡單的測試案例:

from unittest import TestCase
from jenkins.utils import find_latest_build
from jenkins.utils import find_installer
 
 
class TestJenkinsUtils(TestCase):
    base_url = "http://tonylin.idv/job/"
    project = "Example"
    installer_prefix = "Example"
 
    def test_find_latest_master_build(self):
        latest_build = find_latest_build(TestJenkinsUtils.base_url, TestJenkinsUtils.project)
        self.assertTrue(latest_build["url"].startswith(TestJenkinsUtils.base_url))
        self.assertIsNone(latest_build["description"])
        self.assertIsNotNone(latest_build["displayName"])
        self.assertEqual("SUCCESS", latest_build["result"])
 
    def test_find_latest_branch_build(self):
        branch_name = "origin/integration_testing"
 
        latest_build = find_latest_build(TestJenkinsUtils.base_url, TestJenkinsUtils.project, branch_name)
        self.assertTrue(latest_build["url"].startswith(TestJenkinsUtils.base_url))
        self.assertEqual(branch_name, latest_build["description"])
        self.assertIsNotNone(latest_build["displayName"])
        self.assertEqual("SUCCESS", latest_build["result"])
 
    def test_find_none_build(self):
        branch_name = "origin/none"
 
        latest_build = find_latest_build(TestJenkinsUtils.base_url, TestJenkinsUtils.project, branch_name)
        self.assertIsNone(latest_build)
 
    def test_find_build_with_invalid_url(self):
        branch_name = "origin/none"
        try:
            latest_build = find_latest_build(TestJenkinsUtils.base_url, "InvalidProject", branch_name)
        except RuntimeError as e:
            self.assertEqual("request failed, status code=404", e.message)
 
    def test_find_installer(self):
        latest_build = find_latest_build(TestJenkinsUtils.base_url, TestJenkinsUtils.project)
        installer_url = find_installer(latest_build["url"], TestJenkinsUtils.installer_prefix)
        self.assertTrue(installer_url.startswith(TestJenkinsUtils.base_url) and installer_url.__contains__(TestJenkinsUtils.installer_prefix))

友藏內心獨白: 純粹是為了練python而做的。

阿兩的筆記本 Ryoutsu's Notebook

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