Info

Plain directory file based data reporter

Usage

• NOTE: replace /tmp with $env:TEMP for Windows host.

• set up few directories and datafiles

echo 'host1' > /tmp/hosts1
mkdir /tmp/host1
touch /tmp/host1/data.txt
mvn test

mvn spring-boot:run

• create few host lists /tmp/hosts1:

host1
host2
host3

/tmp/hosts2:

host1
host3
host5

/tmp/hosts3:

host6
host7

• create data

for H in $(cat /tmp/hosts1) ;  do D=/tmp/$H; mkdir $D; touch $D/data.txt; K=datakey; echo -e "$K: value for $H\n" > $D/data.txt ;  done

or in Powershell:

cd $env:TEMP
mkdir host1,host2,host3
'host1','host2','host3' | foreach-object { ('dataKey: value for ' + $_) | out-file -literalpath "$_/data.txt" -encoding ascii}
remove-item 'hosts1' -force
'host1','host2','host3','host4' | foreach-object { $_ | out-file -literalpath 'hosts1' -append -encoding ascii}

alternartively start with the hosts file that may have some structure:

$server_tag $hostname/$extra_server_info $additional_fields

iterate over items of inerest and mock up the data files:

$F='hosts2'
$K='datakey'
$V='value'
$T='server tag'
get-content $F  | where-object {
$_ -match $T -and  (-not ($_ -match '^#')) } | 
foreach-object { 
$fields = convertfrom-string $_; 
$H = $fields.P2 -replace '/.*$', ''; 
write-output $H; 
mkdir "${env:TEMP}/$H" -erroraction silentlycontinue;"${K}: ${V}" | out-file -literalpath "${env:TEMP}/$H/data.txt" -encoding ascii }

• test

curl 'http://localhost:8080/data?name=hosts1&key=datakey' | jq '.'

{
  "host1": "value for host1",
  "host3": "value for host3",
  "host2": "value for host2"
}

curl 'http://localhost:8080/data?name=hosts2&key=datakey' | jq '.'

{
  "host5": null,
  "host1": "value for host1",
  "host3": "value for host3"
}

curl 'http://localhost:8080/data?name=hosts3&key=datakey' | jq '.'

{
  "host7": null,
  "host6": null
}

curl http://localhost:8080/data

{}

curl 'http://localhost:8080/typeddata?name=hosts1&key=dataKey' | jq '.'

[
  {
    "hostname": "host1",
    "key": "dataKey",
    "value": "value for host1"
  },
  {
    "hostname": "host2",
    "key": "dataKey",
    "value": "value for host2"
  }
]

curl 'http://localhost:8080/typeddata_v2?name=hosts1&key=dataKey' | jq '.'

{
  "host1": {
    "key": "dataKey",
    "value": "value for host1"
  },
  "host2": {
    "key": "dataKey",
    "value": "value for host2"
  }
}

NOTE:

In the commit cafa2c2deb6ed17a9baaab630b104851d40c48eb introduces the following error

org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No qualifying bean of type 'example.service.ServerService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

The project copied to basic-dirscan-services, rollback of few latest commits pending.

See Also

• https://www.baeldung.com/spring-optional-path-variables

Author

Serguei Kouzmine