从Invoke-RestMethod访问JSON中的数据

时间：2018-10-04 13:01:15

标签： json powershell

我正在从Powershell的Elasticsearch集群访问REST API。调用Get调用并接收数据不是问题。通常，我可以毫无问题地获取所需的数据，但是我正在为这种特殊的响应而苦苦挣扎。我搞砸了。

因此，调用是对API的获取，我的响应包含在变量（$ r）中。

使用Postman时，JSON响应如下所示（仅显示响应中的前两个节点。实际响应中有10个节点）：

{
    "_nodes": {
        "total": 10,
        "successful": 10,
        "failed": 0
    },
    "cluster_name": "helios",
    "nodes": {
        "LvrIjMcFR1ahhFOnPl-gsQ": {
            "name": "log001",
            "transport_address": "172.16.1.36:9300",
            "host": "172.16.1.36",
            "ip": "172.16.1.36",
            "version": "6.2.4",
            "build_hash": "ccec39f",
            "total_indexing_buffer": 1601889894,
            "roles": [
                "master",
                "data",
                "ingest"
            ],
            "attributes": {
                "ml.machine_memory": "68718481408",
                "ml.max_open_jobs": "20",
                "box_type": "hot",
                "ml.enabled": "true"
            }
        },
        "yuW4R6yyRFKYdNDcrnEbXA": {
            "name": "log008",
            "transport_address": "172.16.1.63:9300",
            "host": "172.16.1.63",
            "ip": "172.16.1.63",
            "version": "6.2.4",
            "build_hash": "ccec39f",
            "total_indexing_buffer": 1603639705,
            "roles": [
                "data",
                "ingest"
            ],
            "attributes": {
                "ml.machine_memory": "68718481408",
                "ml.max_open_jobs": "20",
                "box_type": "warm",
                "ml.enabled": "true"
            }
        }
    }
}

我可以使用

$r.nodes

获取节点

LvrIjMcFR1ahhFOnPl-gsQ : @{name=log001; transport_address=172.16.1.36:9300; host=172.16.1.36; ip=172.16.1.36;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1601889894; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
6QHP2i8rTXyw_z2jKqXnaA : @{name=log004; transport_address=172.16.1.68:9300; host=172.16.1.68; ip=172.16.1.68;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1603639705; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
DAgkSb6gQQauZlMDaA-VCw : @{name=log002; transport_address=172.16.1.49:9300; host=172.16.1.49; ip=172.16.1.49;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1601889894; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
aVu1OKHoRSinIZ-Ggf1eFg : @{name=log010; transport_address=172.16.1.60:9300; host=172.16.1.60; ip=172.16.1.60;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1603639705; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
6i9_HsVjTH29r0_vnnIvHg : @{name=log006; transport_address=172.16.1.67:9300; host=172.16.1.67; ip=172.16.1.67;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1603639705; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
QN7vh_UZTg2lgMJ_bZOcFw : @{name=log003; transport_address=172.16.1.35:9300; host=172.16.1.35; ip=172.16.1.35;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1601889894; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
C6iDoIA7RkaM8-OXwG49TQ : @{name=log009; transport_address=172.16.1.62:9300; host=172.16.1.62; ip=172.16.1.62;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1603639705; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
gEJx2P5uRmClV7R_oOyo2w : @{name=log005; transport_address=172.16.1.73:9300; host=172.16.1.73; ip=172.16.1.73;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1603639705; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
yuW4R6yyRFKYdNDcrnEbXA : @{name=log008; transport_address=172.16.1.63:9300; host=172.16.1.63; ip=172.16.1.63;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1603639705; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}
HLQquAaoQaedjtwvATf2cg : @{name=log007; transport_address=172.16.1.69:9300; host=172.16.1.69; ip=172.16.1.69;
                         version=6.2.4; build_hash=ccec39f; total_indexing_buffer=1603639705; roles=System.Object[];
                         attributes=; settings=; os=; process=; jvm=; thread_pool=; transport=; http=;
                         plugins=System.Object[]; modules=System.Object[]; ingest=}

然后我希望做

$r.nodes[0]

获得第一个节点，但这与之前的$ r.nodes完全相同。

$r.nodes."LvrIjMcFR1ahhFOnPl-gsQ"

然后给我有关该节点的信息：

name                  : log001
transport_address     : 172.16.1.36:9300
host                  : 172.16.1.36
ip                    : 172.16.1.36
version               : 6.2.4
build_hash            : ccec39f
total_indexing_buffer : 1601889894
roles                 : {master, data, ingest}
attributes            : @{ml.machine_memory=68718481408; ml.max_open_jobs=20; box_type=hot; ml.enabled=true}

但是由于我事先不知道节点的ID，如何在节点上获得某种迭代器？

我正在使用Powershell 5.1

2 个答案:

答案 0 :(得分：2)

您可以使用PSObject属性分解对象。然后管道直到获得价值

$II = @"
{
    "_nodes": {
        "total": 10,
        "successful": 10,
        "failed": 0
    },
    "cluster_name": "helios",
    "nodes": {
        "LvrIjMcFR1ahhFOnPl-gsQ": {
            "name": "log001",
            "transport_address": "172.16.1.36:9300",
            "host": "172.16.1.36",
            "ip": "172.16.1.36",
            "version": "6.2.4",
            "build_hash": "ccec39f",
            "total_indexing_buffer": 1601889894,
            "roles": [
                "master",
                "data",
                "ingest"
            ],
            "attributes": {
                "ml.machine_memory": "68718481408",
                "ml.max_open_jobs": "20",
                "box_type": "hot",
                "ml.enabled": "true"
            }
        },
        "yuW4R6yyRFKYdNDcrnEbXA": {
            "name": "log008",
            "transport_address": "172.16.1.63:9300",
            "host": "172.16.1.63",
            "ip": "172.16.1.63",
            "version": "6.2.4",
            "build_hash": "ccec39f",
            "total_indexing_buffer": 1603639705,
            "roles": [
                "data",
                "ingest"
            ],
            "attributes": {
                "ml.machine_memory": "68718481408",
                "ml.max_open_jobs": "20",
                "box_type": "warm",
                "ml.enabled": "true"
            }
        }
    }
}
"@ | ConvertFrom-Json

$II.nodes.PSobject.Properties | %{
    $_.Value
}

答案 1 :(得分：0)

这里的问题是将json转换为PSCustomObject。枚举键的最简单方法可能是执行以下操作：

$NodeNames = $r.Nodes | Get-Member -MemberType NoteProperty | Select-Object -ExpandProperty Name
foreach ($NodeName in $NodeNames) {
    $r.Nodes.$Nodename
}

如果要使用PowerShell Core 6.1，还可以执行以下操作：

$r = (Invoke-WebRequest 'http://url').Content | ConvertFrom-Json -AsHashTable

然后您可以使用以下命令枚举按键：

foreach ($node in $r.Nodes.GetEnumerator()) {
    #code here
}
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