Query parent data (multi-level) based on a child value, on a json file, using jq - json

Question

I have a ksh script that retrives (using curl) a json file similar to the one bellow:
{
"Type1": {
"dev": {
"server": [
{ "group": "APP1", "name": "DAPP1002", "ip": "10.1.1.1" },
{ "group": "APP2", "name": "DAPP2001", "ip": "10.1.1.2" }
]
},
"qa": {
"server": [
{ "group": "APP1", "name": "QAPP1002", "ip": "10.1.2.1" },
{ "group": "APP2", "name": "QAPP2001", "ip": "10.1.2.2" }
]
},
"prod": {
"proxy": "type1.prod.proxy.mydomain.com",
"server": [
{ "group": "APP1", "name": "PAPP1001", "ip": "10.1.3.1" },
{ "group": "APP1", "name": "PAPP1002", "ip": "10.1.3.2" },
{ "group": "APP2", "name": "PAPP2001", "ip": "10.1.3.3" }
]
}
},
"Type2": {
"dev": {
"server": [
{ "group": "APP8", "name": "DAPP8002", "ip": "10.2.1.1" },
{ "group": "APP9", "name": "DAPP9001", "ip": "10.2.1.2" }
]
},
"qa": {
"server": [
{ "group": "APP8", "name": "QAPP8002", "ip": "10.2.2.1" },
{ "group": "APP9", "name": "QAPP9001", "ip": "10.2.2.2" }
]
},
"prod": {
"proxy": "type2.prod.proxy.mydomain.com",
"server": [
{ "group": "APP8", "name": "PAPP8001", "ip": "10.2.3.1" },
{ "group": "APP9", "name": "PAPP9001", "ip": "10.2.3.2" },
{ "group": "APP9", "name": "PAPP9002", "ip": "10.2.3.3" }
]
}
}
}
... based on a server name (field "name") I would have to collect the following info, to pass to a function:
"Type", "name", "ip", "proxy"
(Note that the "proxy" info is optional)
I am new to json, and I am trying to get this filtered with jq but so far, I am out of lucky.
What I acomplished so far is the following jq query, when searching for "PAPP9001" :
jq '.[] | .[] | select(.server[].name=="PAPP9001") | .proxy as $proxy | .server[] | {proxy: $proxy, name: .name, ip: .ip} | select(.name=="PAPP9001")' curlreturn.json
which returns me:
{
"proxy": "type2.prod.proxy.mydomain.com",
"name": "PAPP9001",
"ip": "10.2.3.2"
}
but:
I could not get the "Type" info, at the top level
Considering the number of pipes and the 2 selects, I doubt that this is the most efficient way.

Answer 1

One way to retrieve the key names programmatically is using to_entries. For example, given your input, this jq filter:
to_entries[]
| .key as $type
| .value[]
| .proxy as $proxy
| .server[]
| select(.name == "PAPP9001")
| { Type: $type, name, ip, proxy: $proxy }
yields:
{
"Type": "Type2",
"name": "PAPP9001",
"ip": "10.2.3.2",
"proxy": "type2.prod.proxy.mydomain.com"
}
Variations
If, for example, you wanted these four fields as a CSV row, then you could replace the last line of the filter above with:
| [$type, .name, .ip, $proxy] | #csv
See the jq manual for how to use string interpolation.