我有不同的yaml文件，可能有不同的嵌套结构
file1.yaml：
test3:
service1:
name1: |
"somedata"
name2: |
"somedata"
file2.yaml：
test1:
app1:
app2:|
"somedata"
app7:
key2: |
"testapp"
因此您可以看到yaml文件的结构可能不同。
问题是，我是否可以灵活地管理将某些数据附加到这些文件的特定块？
例如在file1中我想在name1和name 2键或service1的级别上写密钥vaue：
test3:
service1:
name1: |
"somedata"
name2: |
"somedata"
my-appended-key:|
"my appended value"
my_second_appended_key: |
"my second appended valye"
等等。
所以我的想法是能够在yaml中指定我想要附加数据的嵌套块。
我有不同的yaml文件，可能有不同的嵌套结构
file1.yaml：
test3:
service1:
name1: |
"somedata"
name2: |
"somedata"
file2.yaml：
test1:
app1:
app2:|
"somedata"
app7:
key2: |
"testapp"
因此您可以看到yaml文件的结构可能不同。
问题是，我是否可以灵活地管理将某些数据附加到这些文件的特定块？
例如在file1中我想在name1和name 2键或service1的级别上写密钥vaue：
test3:
service1:
name1: |
"somedata"
name2: |
"somedata"
my-appended-key:|
"my appended value"
my_second_appended_key: |
"my second appended valye"
等等。
目前我是针对yaml文件结构的具体情况而做的。 这是我的代码的一部分：
import gnupg
import re
import argparse
def NewPillarFile():
with open(args.sensitive) as sensitive_data:
with open(args.encrypted, "w") as encrypted_result:
encrypted_result.write('#!yaml|gpg\n\nsecrets:\n '+args.service+':\n')
for line in sensitive_data:
encrypted_value = gpg.encrypt(re.sub(r'^( +?|[A-Za-z0-9]|[A-Za]|[0-9])+( +)?'+args.separator+'( +)?','',line,1), recipients=args.resident, always_trust=True)
if not encrypted_value.ok:
print(encrypted_value.status, '\n', encrypted_value.stderr)
break
line = re.sub(r'^( +)?','',line)
encrypted_result.write(' '+re.sub(r'( +)?'+args.separator+'.*',': |',line))
encrypted_result.write(re.sub(re.compile(r'^', re.MULTILINE), ' ', encrypted_value.data.decode())+'\n')
def ExistingPillarFile():
with open(args.sensitive) as sensitive_data:
with open(args.encrypted, "a") as encrypted_result:
encrypted_result.write(' '+args.service+':\n')
for line in sensitive_data:
encrypted_value = gpg.encrypt(
re.sub(r'^( +?|[A-Za-z0-9]|[A-Za]|[0-9])+( +)?' + args.separator + '( +)?', '', line, 1),
recipients=args.resident, always_trust=True)
if not encrypted_value.ok:
print(encrypted_value.status, '\n', encrypted_value.stderr)
break
line = re.sub(r'^( +)?', '', line)
encrypted_result.write(' ' + re.sub(r'( +)?' + args.separator + '.*', ': |', line))
encrypted_result.write(re.sub(re.compile(r'^', re.MULTILINE), ' ', encrypted_value.data.decode())+'\n')
所以我的想法是能够指定yaml中哪个嵌套块我想附加数据以使脚本更灵活。
答案 0 :(得分：0)
您可以使用PyYAML的低级事件接口。假设您有一个输入YAML文件并想要将修改写入输出YAML文件，您可以编写一个函数，该函数通过PyYAML生成的事件流并在指定位置插入请求的附加值：
import yaml
from yaml.events import *
class AppendableEvents:
def __init__(self, path, events):
self.path = path
self.events = events
def correct_position(self, levels):
if len(self.path) != len(levels):
return False
for index, expected in enumerate(self.path):
if expected != levels[index].cur_id:
return False
return True
class Level:
def __init__(self, mode):
self.mode = mode
self.cur_id = -1 if mode == "item" else ""
def append_to_yaml(yamlFile, targetFile, items):
events = []
levels = []
with open(yamlFile, 'r') as handle:
for event in yaml.parse(handle):
if isinstance(event, StreamStartEvent) or \
isinstance(event, StreamEndEvent) or \
isinstance(event, DocumentStartEvent) or \
isinstance(event, DocumentEndEvent):
pass
elif isinstance(event, CollectionStartEvent):
if len(levels) > 0:
if levels[-1].mode == "key":
# we can only handle scalar keys
raise ValueError("encountered complex key!")
else:
if levels[-1].mode == "value":
levels[-1].mode = "key"
if isinstance(event, MappingStartEvent):
levels.append(Level("key"))
else: # SequenceStartEvent
levels.append(Level("item"))
elif isinstance(event, ScalarEvent):
if len(levels) > 0:
if levels[-1].mode == "item":
levels[-1].cur_id += 1
elif levels[-1].mode == "key":
levels[-1].cur_id = event.value
levels[-1].mode = "value"
else: # mode == "value"
levels[-1].mode = "key"
elif isinstance(event, CollectionEndEvent):
# here we check whether we want to append anything
levels.pop()
for item in items:
if item.correct_position(levels):
for additional_event in item.events:
events.append(additional_event)
events.append(event)
with open(targetFile, mode="w") as handle:
yaml.emit(events, handle)
要使用它，您必须提供要作为YAML事件列表追加的其他内容，并将所需位置指定为键列表（或序列索引）：
def key(name):
return ScalarEvent(None, None, (True, True), name)
def literal_value(content):
return ScalarEvent(None, None, (False, True), content, style="|")
append_to_yaml("file1.yaml", "file1_modified.yaml", [
AppendableEvents(["test3", "service1"], [
key("my-appended-key"),
literal_value("\"my appended value\"\n")]),
AppendableEvents(["test3"], [
key("my_second_appended_key"),
literal_value("\"my second appended value\"\n")])])
此代码正确地将您的file1.yaml转换为给定的修改文件。通常，这还允许您附加复杂（序列或映射）节点。以下是如何执行此操作的基本示例：
def seq(*scalarValues):
return [SequenceStartEvent(None, None, True)] + \
[ScalarEvent(None, None, (True, False), v) for v in scalarValues] + \
[SequenceEndEvent()]
def map(*scalarValues):
return [MappingStartEvent(None, None, True)] + \
[ScalarEvent(None, None, (True, False), v) for v in scalarValues] + \
[MappingEndEvent()]
append_to_yaml("file1.yaml", "file1_modified.yaml", [
AppendableEvents(["test3", "service1"], [
key("my-appended-key")] + seq("one", "two", "three")),
AppendableEvents(["test3"], [
key("my_second_appended_key")] + map("foo", "bar"))])