nebulous/monitoring
Code Issues Proposed changes

Added examples

Browse Source 
* Added samples of Helm charts, and sample application code for sending application metrics  (Java, Python)
* Fixed ems-nebulous Dockerfile

Change-Id: I31504a817ba0c0f7b73717d0b72a71317f8ec9b5
This commit is contained in:
ipatini 2024-03-01 14:36:40 +02:00
parent d3d3097e22
commit c773bc1328
31 changed files with 1584 additions and 1 deletions
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2
nebulous/Dockerfile
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@ -9,7 +9,7 @@ COPY pom.xml ${BASEDIR}/
RUN mvn -f ${BASEDIR}/pom.xml -DskipTests clean install
# ----------------- Runtime image -----------------
FROM registry.gitlab.com/nebulous-project/ems-main/ems-server:2024-jan
FROM registry.gitlab.com/nebulous-project/ems-main/ems-server:opendev
COPY --from=builder /app/ems-nebulous/target/ems-nebulous-plugin-1.0.0-SNAPSHOT-jar-with-dependencies.jar /plugins/
ENV EXTRA_LOADER_PATHS=/plugins/*

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nebulous/examples/LICENSE Normal file
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@ -0,0 +1,373 @@
Mozilla Public License Version 2.0
==================================
1. Definitions
--------------
1.1. "Contributor"
means each individual or legal entity that creates, contributes to
the creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used
by a Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached
the notice in Exhibit A, the Executable Form of such Source Code
Form, and Modifications of such Source Code Form, in each case
including portions thereof.
1.5. "Incompatible With Secondary Licenses"
means
(a) that the initial Contributor has attached the notice described
in Exhibit B to the Covered Software; or
(b) that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the
terms of a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in
a separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible,
whether at the time of the initial grant or subsequently, any and
all of the rights conveyed by this License.
1.10. "Modifications"
means any of the following:
(a) any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered
Software; or
(b) any new file in Source Code Form that contains any Covered
Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the
License, by the making, using, selling, offering for sale, having
made, import, or transfer of either its Contributions or its
Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU
Lesser General Public License, Version 2.1, the GNU Affero General
Public License, Version 3.0, or any later versions of those
licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that
controls, is controlled by, or is under common control with You. For
purposes of this definition, "control" means (a) the power, direct
or indirect, to cause the direction or management of such entity,
whether by contract or otherwise, or (b) ownership of more than
fifty percent (50%) of the outstanding shares or beneficial
ownership of such entity.
2. License Grants and Conditions
--------------------------------
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
(a) under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
(b) under Patent Claims of such Contributor to make, use, sell, offer
for sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
(a) for any code that a Contributor has removed from Covered Software;
or
(b) for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
(c) under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights
to grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
in Section 2.1.
3. Responsibilities
-------------------
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
(a) such Covered Software must also be made available in Source Code
Form, as described in Section 3.1, and You must inform recipients of
the Executable Form how they can obtain a copy of such Source Code
Form by reasonable means in a timely manner, at a charge no more
than the cost of distribution to the recipient; and
(b) You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter
the recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty,
or limitations of liability) contained within the Source Code Form of
the Covered Software, except that You may alter any license notices to
the extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
---------------------------------------------------
If it is impossible for You to comply with any of the terms of this
License with respect to some or all of the Covered Software due to
statute, judicial order, or regulation then You must: (a) comply with
the terms of this License to the maximum extent possible; and (b)
describe the limitations and the code they affect. Such description must
be placed in a text file included with all distributions of the Covered
Software under this License. Except to the extent prohibited by statute
or regulation, such description must be sufficiently detailed for a
recipient of ordinary skill to be able to understand it.
5. Termination
--------------
5.1. The rights granted under this License will terminate automatically
if You fail to comply with any of its terms. However, if You become
compliant, then the rights granted under this License from a particular
Contributor are reinstated (a) provisionally, unless and until such
Contributor explicitly and finally terminates Your grants, and (b) on an
ongoing basis, if such Contributor fails to notify You of the
non-compliance by some reasonable means prior to 60 days after You have
come back into compliance. Moreover, Your grants from a particular
Contributor are reinstated on an ongoing basis if such Contributor
notifies You of the non-compliance by some reasonable means, this is the
first time You have received notice of non-compliance with this License
from such Contributor, and You become compliant prior to 30 days after
Your receipt of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all
end user license agreements (excluding distributors and resellers) which
have been validly granted by You or Your distributors under this License
prior to termination shall survive termination.
************************************************************************
* *
* 6. Disclaimer of Warranty *
* ------------------------- *
* *
* Covered Software is provided under this License on an "as is" *
* basis, without warranty of any kind, either expressed, implied, or *
* statutory, including, without limitation, warranties that the *
* Covered Software is free of defects, merchantable, fit for a *
* particular purpose or non-infringing. The entire risk as to the *
* quality and performance of the Covered Software is with You. *
* Should any Covered Software prove defective in any respect, You *
* (not any Contributor) assume the cost of any necessary servicing, *
* repair, or correction. This disclaimer of warranty constitutes an *
* essential part of this License. No use of any Covered Software is *
* authorized under this License except under this disclaimer. *
* *
************************************************************************
************************************************************************
* *
* 7. Limitation of Liability *
* -------------------------- *
* *
* Under no circumstances and under no legal theory, whether tort *
* (including negligence), contract, or otherwise, shall any *
* Contributor, or anyone who distributes Covered Software as *
* permitted above, be liable to You for any direct, indirect, *
* special, incidental, or consequential damages of any character *
* including, without limitation, damages for lost profits, loss of *
* goodwill, work stoppage, computer failure or malfunction, or any *
* and all other commercial damages or losses, even if such party *
* shall have been informed of the possibility of such damages. This *
* limitation of liability shall not apply to liability for death or *
* personal injury resulting from such party's negligence to the *
* extent applicable law prohibits such limitation. Some *
* jurisdictions do not allow the exclusion or limitation of *
* incidental or consequential damages, so this exclusion and *
* limitation may not apply to You. *
* *
************************************************************************
8. Litigation
-------------
Any litigation relating to this License may be brought only in the
courts of a jurisdiction where the defendant maintains its principal
place of business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions.
Nothing in this Section shall prevent a party's ability to bring
cross-claims or counter-claims.
9. Miscellaneous
----------------
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides
that the language of a contract shall be construed against the drafter
shall not be used to construe this License against a Contributor.
10. Versions of the License
---------------------------
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses
If You choose to distribute Source Code Form that is Incompatible With
Secondary Licenses under the terms of this version of the License, the
notice described in Exhibit B of this License must be attached.
Exhibit A - Source Code Form License Notice
-------------------------------------------
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at https://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular
file, then You may include the notice in a location (such as a LICENSE
file in a relevant directory) where a recipient would be likely to look
for such a notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
---------------------------------------------------------
This Source Code Form is "Incompatible With Secondary Licenses", as
defined by the Mozilla Public License, v. 2.0.

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# Patterns to ignore when building packages.
# This supports shell glob matching, relative path matching, and
# negation (prefixed with !). Only one pattern per line.
.DS_Store
# Common VCS dirs
.git/
.gitignore
.bzr/
.bzrignore
.hg/
.hgignore
.svn/
# Common backup files
*.swp
*.bak
*.tmp
*.orig
*~
# Various IDEs
.project
.idea/
*.tmproj
.vscode/

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nebulous/examples/helm-charts/ems-server/Chart.yaml Normal file
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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
# Esper library is used, in which case it is subject to the terms of General Public License v2.0.
# If a copy of the MPL was not distributed with this file, you can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
apiVersion: v2
name: ems-server
description: EMS server Helm chart for Kubernetes
# A chart can be either an 'application' or a 'library' chart.
#
# Application charts are a collection of templates that can be packaged into versioned archives
# to be deployed.
#
# Library charts provide useful utilities or functions for the chart developer. They're included as
# a dependency of application charts to inject those utilities and functions into the rendering
# pipeline. Library charts do not define any templates and therefore cannot be deployed.
type: application
# This is the chart version. This version number should be incremented each time you make changes
# to the chart and its templates, including the app version.
# Versions are expected to follow Semantic Versioning (https://semver.org/)
version: 0.1.0
# This is the version number of the application being deployed. This version number should be
# incremented each time you make changes to the application. Versions are not expected to
# follow Semantic Versioning. They should reflect the version the application is using.
# It is recommended to use it with quotes.
appVersion: "7.0.0-SNAPSHOT"

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1. Get the application URL by running these commands:
{{- if .Values.ingress.enabled }}
{{- range $host := .Values.ingress.hosts }}
{{- range .paths }}
http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
{{- end }}
{{- end }}
{{- else if contains "NodePort" .Values.service.type }}
export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "ems-server.fullname" . }})
export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
echo http://$NODE_IP:$NODE_PORT
{{- else if contains "LoadBalancer" .Values.service.type }}
NOTE: It may take a few minutes for the LoadBalancer IP to be available.
You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "ems-server.fullname" . }}'
export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "ems-server.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
echo http://$SERVICE_IP:{{ .Values.service.port }}
{{- else if contains "ClusterIP" .Values.service.type }}
export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "ems-server.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
echo "Visit http://127.0.0.1:8080 to use your application"
kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
{{- end }}

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{{/*
Expand the name of the chart.
*/}}
{{- define "ems-server.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
{{- end }}
{{/*
Create a default fully qualified app name.
We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
If release name contains chart name it will be used as a full name.
*/}}
{{- define "ems-server.fullname" -}}
{{- if .Values.fullnameOverride }}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- $name := default .Chart.Name .Values.nameOverride }}
{{- if contains $name .Release.Name }}
{{- .Release.Name | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
{{- end }}
{{- end }}
{{- end }}
{{/*
Create chart name and version as used by the chart label.
*/}}
{{- define "ems-server.chart" -}}
{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
{{- end }}
{{/*
Common labels
*/}}
{{- define "ems-server.labels" -}}
helm.sh/chart: {{ include "ems-server.chart" . }}
{{ include "ems-server.selectorLabels" . }}
{{- if .Chart.AppVersion }}
app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
{{- end }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end }}
{{/*
Selector labels
*/}}
{{- define "ems-server.selectorLabels" -}}
app.kubernetes.io/name: {{ include "ems-server.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end }}
{{/*
Create the name of the service account to use
*/}}
{{- define "ems-server.serviceAccountName" -}}
{{- if .Values.serviceAccount.create }}
{{- default (include "ems-server.fullname" .) .Values.serviceAccount.name }}
{{- else }}
{{- default "default" .Values.serviceAccount.name }}
{{- end }}
{{- end }}

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
# Esper library is used, in which case it is subject to the terms of General Public License v2.0.
# If a copy of the MPL was not distributed with this file, you can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ include "ems-server.fullname" . }}
labels:
{{- include "ems-server.labels" . | nindent 4 }}
spec:
{{- if not .Values.autoscaling.enabled }}
replicas: {{ .Values.replicaCount }}
{{- end }}
selector:
matchLabels:
{{- include "ems-server.selectorLabels" . | nindent 6 }}
template:
metadata:
{{- with .Values.podAnnotations }}
annotations:
{{- toYaml . | nindent 8 }}
{{- end }}
labels:
{{- include "ems-server.selectorLabels" . | nindent 8 }}
spec:
{{- with .Values.imagePullSecrets }}
imagePullSecrets:
{{- toYaml . | nindent 8 }}
{{- end }}
serviceAccountName: {{ include "ems-server.serviceAccountName" . }}
securityContext:
{{- toYaml .Values.podSecurityContext | nindent 8 }}
terminationGracePeriodSeconds: 10
containers:
- name: {{ .Chart.Name }}
securityContext:
{{- toYaml .Values.securityContext | nindent 12 }}
image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
imagePullPolicy: {{ .Values.image.pullPolicy }}
env:
{{- range .Values.env }}
- name: {{ .name }}
value: {{ .value | quote }}
{{- end }}
ports:
{{- range .Values.ports }}
- name: {{ .name }}
containerPort: {{ .containerPort }}
protocol: {{ .protocol }}
{{- end }}
livenessProbe:
tcpSocket:
port: http
readinessProbe:
tcpSocket:
port: http
resources:
{{- toYaml .Values.resources | nindent 12 }}
{{- with .Values.nodeSelector }}
nodeSelector:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.affinity }}
affinity:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.tolerations }}
tolerations:
{{- toYaml . | nindent 8 }}
{{- end }}
---
# The configmap to be updated
#apiVersion: v1
#kind: ConfigMap
#metadata:
# name: ems-client-configmap
#---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: ems-server-role-binding
subjects:
- kind: ServiceAccount
name: {{ include "ems-server.serviceAccountName" . }}
# namespace: default
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: ems-server-role
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: ems-server-role
# Benefit of using RBAC over giving your personal access token as a secret to your application: You can pinpoint which access you want to allow
rules:
- apiGroups: ["", "apps"] # Empty string for kubernetes system
resources: ["configmaps", "daemonsets"]
resourceNames: ["monitoring-configmap", "ems-client-configmap", "ems-client-daemonset"]
verbs: ["get", "update", "delete", "list", "watch", "patch"]
- apiGroups: ["", "apps"] # Empty string for kubernetes system
resources: ["configmaps", "daemonsets"]
verbs: ["create"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: ems-server-cluster-role-binding
subjects:
- kind: ServiceAccount
name: {{ include "ems-server.serviceAccountName" . }}
namespace: default
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: ems-server-cluster-role
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: ems-server-cluster-role
rules:
- apiGroups: ["", "apps"]
resources: ["pods", "nodes"]
verbs: ["get", "list", "watch"]

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{{- if .Values.autoscaling.enabled }}
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
name: {{ include "ems-server.fullname" . }}
labels:
{{- include "ems-server.labels" . | nindent 4 }}
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: {{ include "ems-server.fullname" . }}
minReplicas: {{ .Values.autoscaling.minReplicas }}
maxReplicas: {{ .Values.autoscaling.maxReplicas }}
metrics:
{{- if .Values.autoscaling.targetCPUUtilizationPercentage }}
- type: Resource
resource:
name: cpu
targetAverageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
{{- end }}
{{- if .Values.autoscaling.targetMemoryUtilizationPercentage }}
- type: Resource
resource:
name: memory
targetAverageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}
{{- end }}
{{- end }}

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{{- if .Values.ingress.enabled -}}
{{- $fullName := include "ems-server.fullname" . -}}
{{- $svcPort := .Values.service.port -}}
{{- if and .Values.ingress.className (not (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion)) }}
{{- if not (hasKey .Values.ingress.annotations "kubernetes.io/ingress.class") }}
{{- $_ := set .Values.ingress.annotations "kubernetes.io/ingress.class" .Values.ingress.className}}
{{- end }}
{{- end }}
{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion -}}
apiVersion: networking.k8s.io/v1
{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
apiVersion: networking.k8s.io/v1beta1
{{- else -}}
apiVersion: extensions/v1beta1
{{- end }}
kind: Ingress
metadata:
name: {{ $fullName }}
labels:
{{- include "ems-server.labels" . | nindent 4 }}
{{- with .Values.ingress.annotations }}
annotations:
{{- toYaml . | nindent 4 }}
{{- end }}
spec:
{{- if and .Values.ingress.className (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}
ingressClassName: {{ .Values.ingress.className }}
{{- end }}
{{- if .Values.ingress.tls }}
tls:
{{- range .Values.ingress.tls }}
- hosts:
{{- range .hosts }}
- {{ . | quote }}
{{- end }}
secretName: {{ .secretName }}
{{- end }}
{{- end }}
rules:
{{- range .Values.ingress.hosts }}
- host: {{ .host | quote }}
http:
paths:
{{- range .paths }}
- path: {{ .path }}
{{- if and .pathType (semverCompare ">=1.18-0" $.Capabilities.KubeVersion.GitVersion) }}
pathType: {{ .pathType }}
{{- end }}
backend:
{{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
service:
name: {{ $fullName }}
port:
number: {{ $svcPort }}
{{- else }}
serviceName: {{ $fullName }}
servicePort: {{ $svcPort }}
{{- end }}
{{- end }}
{{- end }}
{{- end }}

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
# Esper library is used, in which case it is subject to the terms of General Public License v2.0.
# If a copy of the MPL was not distributed with this file, you can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
apiVersion: v1
kind: Service
metadata:
name: {{ include "ems-server.fullname" . }}
labels:
{{- include "ems-server.labels" . | nindent 4 }}
spec:
type: {{ .Values.service.type }}
ports:
- port: {{ .Values.service.port }}
targetPort: http
protocol: TCP
name: http
selector:
{{- include "ems-server.selectorLabels" . | nindent 4 }}

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{{- if .Values.serviceAccount.create -}}
apiVersion: v1
kind: ServiceAccount
metadata:
name: {{ include "ems-server.serviceAccountName" . }}
labels:
{{- include "ems-server.labels" . | nindent 4 }}
{{- with .Values.serviceAccount.annotations }}
annotations:
{{- toYaml . | nindent 4 }}
{{- end }}
{{- end }}

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apiVersion: v1
kind: Pod
metadata:
name: "{{ include "ems-server.fullname" . }}-test-connection"
labels:
{{- include "ems-server.labels" . | nindent 4 }}
annotations:
"helm.sh/hook": test
spec:
containers:
- name: wget
image: busybox
command: ['wget']
args: ['{{ include "ems-server.fullname" . }}:{{ .Values.service.port }}']
restartPolicy: Never

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
# Esper library is used, in which case it is subject to the terms of General Public License v2.0.
# If a copy of the MPL was not distributed with this file, you can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
# Default values for ems-server.
# This is a YAML-formatted file.
# Declare variables to be passed into your templates.
replicaCount: 1
image:
repository: "quay.io/nebulous/monitoring"
pullPolicy: IfNotPresent
# Overrides the image tag whose default is the chart appVersion.
tag: &image_tag "latest"
imagePullSecrets: []
nameOverride: ""
fullnameOverride: ""
serviceAccount:
# Specifies whether a service account should be created
create: true
# Annotations to add to the service account
annotations: {}
# The name of the service account to use.
# If not set and create is true, a name is generated using the fullname template
name: "ems-server-service-account"
podAnnotations: {}
podSecurityContext: {}
# fsGroup: 2000
securityContext: {}
# capabilities:
# drop:
# - ALL
# readOnlyRootFilesystem: true
# runAsNonRoot: true
# runAsUser: 1000
service:
type: ClusterIP
port: 8111
ingress:
enabled: false
className: ""
annotations: {}
# kubernetes.io/ingress.class: nginx
# kubernetes.io/tls-acme: "true"
hosts:
- host: chart-example.local
paths:
- path: /
pathType: ImplementationSpecific
tls: []
# - secretName: chart-example-tls
# hosts:
# - chart-example.local
resources: {}
# We usually recommend not to specify default resources and to leave this as a conscious
# choice for the user. This also increases chances charts run on environments with little
# resources, such as Minikube. If you do want to specify resources, uncomment the following
# lines, adjust them as necessary, and remove the curly braces after 'resources:'.
# limits:
# cpu: 100m
# memory: 128Mi
# requests:
# cpu: 100m
# memory: 128Mi
autoscaling:
enabled: false
minReplicas: 1
maxReplicas: 1
targetCPUUtilizationPercentage: 80
# targetMemoryUtilizationPercentage: 80
nodeSelector: {}
tolerations: []
affinity: {}
ports:
- name: http
containerPort: 8111
protocol: TCP
- name: openwire
containerPort: 61616
protocol: TCP
- name: openwire-tls
containerPort: 61617
protocol: TCP
- name: stomp
containerPort: 61610
protocol: TCP
env:
#
# ===== EMS server configuration =====
#
# ===== INITIALIZATION settings =====
- name: JASYPT_PASSWORD
value: 'password'
- name: NET_UTIL_ADDRESS_DISCOVERY_SERVICES
value: '-'
- name: EMS_IP_SETTING
value: 'DEFAULT_IP'
# ===== Authentication settings =====
- name: JWT_SECRET
value: 'ENC(I0mRWgH2FVDDNs4OBcdh7Z+o3lOQDa3ztaEtmnXT2HN0aClkChp/lqm9zM5HyTk0stJ7v2Di75U=)'
- name: WEB_SECURITY_API_KEY_AUTHENTICATION_VALUE
value: '1234567890'
- name: WEB_SECURITY_FORM_AUTHENTICATION_PASSWORD
value: 'ems'
- name: EXTERNAL_ENABLED
value: 'true'
- name: EXTERNAL_BROKER_ADDRESS
value: ''
- name: EXTERNAL_BROKER_PORT
value: '5672'
- name: EXTERNAL_BROKER_USERNAME
value: ''
- name: EXTERNAL_BROKER_PASSWORD
value: ''
# ===== Broker settings =====
- name: BROKERCEP_ADDITIONAL_BROKER_CREDENTIALS
value: 'aaa/111, bbb/222'
# value: 'ENC(axeJUxNHajYfBffUwvuT3kwTgLTpRliDMz/ZQ9hROZ3BNOv0Idw72NJsawzIZRuZ)'
- name: BROKERCEP_EVENT_RECORDER_ENABLED
value: 'false'
- name: BROKERCEP_EVENT_RECORDER_FILTER_MODE
value: 'ALL'
# ===== Baguette Server settings =====
- name: BAGUETTE_SERVER_CREDENTIALS
# value: '{ "aa":"xx" }'
value: 'ENC(y46CiW6przlpXvz8ToE+T1Sn6uGfO2haP7OhATB0SXo=)'
#
# ===== EMS server K8sClientInstaller configuration =====
#
- name: EMS_CLIENT_DEPLOYMENT_DRY_RUN
value: "false"
- name: K8S_SERVICE_ACCOUNT_SECRETS_PATH
value: "/var/run/secrets/kubernetes.io/serviceaccount"
- name: APP_CONFIG_MAP_NAME
value: "monitoring-configmap"
# - name: EMS_CLIENT_BROKER_USERNAME # It is appended to EMS_CLIENT_ADDITIONAL_BROKER_CREDENTIALS
# value: "ccc"
# - name: EMS_CLIENT_BROKER_PASSWORD
# value: "333"
- name: EMS_CLIENT_CONFIG_MAP_NAME
value: "ems-client-configmap"
# - name: EMS_CLIENT_DAEMONSET_SPECIFICATION_FILE
# value: "/ems-client-daemonset.yaml"
- name: EMS_CLIENT_DAEMONSET_NAME
value: "ems-client-daemonset"
- name: EMS_CLIENT_DAEMONSET_IMAGE_REPOSITORY
value: "registry.gitlab.com/nebulous-project/ems-main/ems-client"
- name: EMS_CLIENT_DAEMONSET_IMAGE_TAG
# value: "latest"
value: *image_tag
- name: EMS_CLIENT_DAEMONSET_IMAGE_PULL_POLICY
value: "Always"
- name: EMS_CLIENT_ADDITIONAL_BROKER_CREDENTIALS
value: 'aaa/111, bbb/222'
# value: "ENC(axeJUxNHajYfBffUwvuT3kwTgLTpRliDMz/ZQ9hROZ3BNOv0Idw72NJsawzIZRuZ)"
- name: EMS_CLIENT_KEYSTORE_SECRET
value: ""
- name: EMS_CLIENT_TRUSTSTORE_SECRET
value: ""

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
# Esper library is used, in which case it is subject to the terms of General Public License v2.0.
# If a copy of the MPL was not distributed with this file, you can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
apiVersion: v2
name: simple-app
description: Simple App Helm chart
version: 0.1.0

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{{/* _helpers.tpl */}}
{{- define "simple-app.fullname" -}}
{{- printf "%s-%s" .Release.Name .Chart.Name }}
{{- end -}}
{{- define "simple-app.labels" -}}
app.kubernetes.io/name: {{ include "simple-app.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end -}}
{{- define "simple-app.selectorLabels" -}}
app.kubernetes.io/name: {{ include "simple-app.name" . }}
{{- end -}}
{{- define "simple-app.name" -}}
{{- default "simple-app" .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
{{- end -}}

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apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ include "simple-app.fullname" . }}
spec:
replicas: 1
selector:
matchLabels:
app: {{ include "simple-app.fullname" . }}
template:
metadata:
labels:
app: {{ include "simple-app.fullname" . }}
spec:
containers:
- name: {{ .Chart.Name }}
image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
imagePullPolicy: {{ .Values.image.pullPolicy }}
ports:
- containerPort: 8080
env:
#
# K8S cluster node info
#
- name: K8S_NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: K8S_NODE_ADDRESS
valueFrom:
fieldRef:
fieldPath: status.hostIP
#
# Pod info
#
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: POD_ADDRESS
valueFrom:
fieldRef:
fieldPath: status.podIP
#
# EMS client broker info
#
- name: 'BROKER_SERVER'
valueFrom:
fieldRef:
fieldPath: status.hostIP
- name: 'BROKER_PORT'
value: '61610'
- name: 'BROKER_USERNAME'
valueFrom:
configMapKeyRef:
name: monitoring-configmap
key: BROKER_USERNAME
- name: 'BROKER_PASSWORD'
valueFrom:
configMapKeyRef:
name: monitoring-configmap
key: BROKER_PASSWORD
#
# Env. vars from Values.yaml
#
{{- range .Values.env }}
- name: {{ .name }}
value: {{ .value | quote }}
{{- end }}
volumeMounts:
{{- range .Values.volumeMounts }}
- name: {{ .name }}
mountPath: {{ .mountPath | quote }}
{{- end }}

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
# Esper library is used, in which case it is subject to the terms of General Public License v2.0.
# If a copy of the MPL was not distributed with this file, you can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
replicaCount: 1
image:
repository: "simple-app"
pullPolicy: IfNotPresent
# Overrides the image tag whose default is the chart appVersion.
tag: "latest"
env:
- name: 'TARGET_TOPIC'
value: 'a__component_cpu__util__instance__SENSOR'
- name: 'SEND_DELAY'
value: '10'
- name: 'VALUE_MIN'
value: '0'
- name: 'VALUE_MAX'
value: '100'

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
* text eol=lf

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target/
### STS ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
### IntelliJ IDEA ###
.idea
*.iws
*.iml
*.ipr

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
FROM eclipse-temurin:21.0.2_13-jre-jammy
WORKDIR /app
RUN apt-get update && \
apt-get install -y vim iputils-ping curl telnet && \
rm -rf /var/lib/apt/lists/*
COPY target/simple-app-java-jar-with-dependencies.jar /app/
COPY entrypoint.sh /app/
RUN chmod + /app/*.sh
EXPOSE 8080
ENTRYPOINT [ "./entrypoint.sh" ]

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
services:
simple-app:
image: simple-app:latest
environment:
- BROKER_SERVER=host.docker.internal
- BROKER_PORT=61616
- BROKER_USERNAME=aaa
- BROKER_PASSWORD=111
- TARGET_TOPIC=some_topic
- SEND_DELAY=10
- VALUE_MIN=0
- VALUE_MAX=100
ports:
- 8080:8080

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#!/usr/bin/env bash
#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
# Start simple-app to send messages to broker
java -jar simple-app-java-jar-with-dependencies.jar

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<!--
~ Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
~
~ This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
~ Esper library is used, in which case it is subject to the terms of General Public License v2.0.
~ If a copy of the MPL was not distributed with this file, you can obtain one at
~ https://www.mozilla.org/en-US/MPL/2.0/
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>simple-app-java</artifactId>
<groupId>ems-examples</groupId>
<version>1.0.0</version>
<name>Simple App for sending metrics to EMS client</name>
<dependencies>
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-client</artifactId>
<version>6.0.1</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>gr.iccs.imu.ems.example.SimpleApp</mainClass>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
<addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

142
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/*
* Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
*
* This Source Code Form is subject to the terms of the Mozilla Public License, v2.0, unless
* Esper library is used, in which case it is subject to the terms of General Public License v2.0.
* If a copy of the MPL was not distributed with this file, you can obtain one at
* https://www.mozilla.org/en-US/MPL/2.0/
*/
package gr.iccs.imu.ems.example;
import jakarta.jms.*;
import org.apache.activemq.ActiveMQConnectionFactory;
public class SimpleApp {
private Connection connection;
private Session session;
public static void main(String[] args) throws InterruptedException {
// Load configuration
String brokerAddress = getOrDefault("BROKER_SERVER", "localhost");
String brokerPort = getOrDefault("BROKER_PORT", "61616");
String connectionString = "tcp://"+brokerAddress+":"+brokerPort;
String username = getOrDefault("BROKER_USERNAME", "aaa");
String password = getOrDefault("BROKER_PASSWORD", "111");
String destinationName = getOrDefault("TARGET_TOPIC", "sample_topic");
int retryConnect = Integer.parseInt(getOrDefault("RETRY_CONNECT", "5"));
int sendDelay = Integer.parseInt(getOrDefault("SEND_DELAY", "10"));
double valueMin = Double.parseDouble(getOrDefault("VALUE_MIN", "0"));
double valueMax = Double.parseDouble(getOrDefault("VALUE_MAX", "100"));
// Print configuration
System.out.println("===== Configuration =====");
System.out.println(" BROKER_SERVER: "+brokerAddress);
System.out.println(" BROKER_PORT: "+brokerPort);
System.out.println(" CONNECTION-STR: "+connectionString);
System.out.println("BROKER_USERNAME: "+username);
System.out.println("BROKER_PASSWORD: "+password);
System.out.println(" TARGET_TOPIC: "+destinationName);
System.out.println(" RETRY_CONNECT: "+retryConnect);
System.out.println(" SEND_DELAY: "+sendDelay);
System.out.println(" VALUE_MIN: "+valueMin);
System.out.println(" VALUE_MAX: "+valueMax);
// Run example
while (true) {
try {
SimpleApp app = new SimpleApp();
app.runExample(connectionString, username, password,
destinationName, 1000L * sendDelay, valueMin, valueMax);
} catch (Exception e) {
System.err.println("EXCEPTION: "+e.getMessage());
e.printStackTrace(System.err);
System.out.println("Retrying in "+retryConnect+" seconds");
Thread.sleep(1000L * retryConnect);
}
}
}
protected static String getOrDefault(String name, String defaultValue) {
String value = System.getenv(name);
if (value==null || value.trim().isEmpty())
value = defaultValue;
if (value==null)
throw new IllegalArgumentException("Property "+name+" is not provided or is empty, and default value is null");
return value.trim();
}
public void runExample(String connectionString, String username, String password,
String destinationName, long sendDelay, double valueMin, double valueMax)
throws JMSException, InterruptedException
{
try {
// open connection
openConnection(connectionString, username, password);
System.out.println("Connected to broker: "+connectionString+", as user: "+username);
// Create the destination (Topic)
Topic destination = session.createTopic(destinationName);
System.out.println("Sending to topic: "+destinationName);
// Create a MessageProducer from the Session to the Topic
MessageProducer producer = session.createProducer(destination);
producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
// Publish values
double valueRange = valueMax - valueMin;
while (true) {
publishEvent(producer, valueRange * Math.random() - valueMin);
Thread.sleep(sendDelay);
}
} finally {
// close connection
closeConnection();
}
}
// ------------------------------------------------------------------------
protected void publishEvent(MessageProducer producer, double value) throws JMSException {
// Create a messages
String payloadText = String.format("{ \"metricValue\": %f, \"level\": 1, \"timestamp\": %d }", value, System.currentTimeMillis());
Message message = session.createTextMessage(payloadText);
// Send the message
producer.send(message);
System.out.println("Sent: " + payloadText);
}
// ------------------------------------------------------------------------
public void openConnection(String connectionString, String username, String password) throws JMSException {
// Create connection factory
ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(connectionString);
connectionFactory.setBrokerURL(connectionString);
connectionFactory.setUserName(username);
connectionFactory.setPassword(password);
connectionFactory.setTrustAllPackages(true);
connectionFactory.setWatchTopicAdvisories(true);
// Create a Connection
Connection connection = connectionFactory.createConnection();
connection.start();
// Create a Session
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
this.connection = connection;
this.session = session;
}
public void closeConnection() throws JMSException {
// Clean up
session.close();
connection.close();
session = null;
connection = null;
}
}

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
* text eol=lf

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
FROM python:3.9.18-slim
WORKDIR /app
RUN apt-get update && \
apt-get install -y netcat-traditional && \
apt-get install -y vim iputils-ping curl telnet && \
rm -rf /var/lib/apt/lists/*
COPY requirements.txt /app/
RUN pip install -r requirements.txt
COPY simple-app.py /app/
COPY simple-prometheus-exporter.sh /app/
COPY entrypoint.sh /app/
RUN chmod + /app/*.sh
EXPOSE 8080
ENTRYPOINT [ "./entrypoint.sh" ]

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
services:
simple-app:
image: simple-app:latest
environment:
- BROKER_SERVER=host.docker.internal
- BROKER_PORT=61610
- BROKER_USERNAME=aaa
- BROKER_PASSWORD=111
- TARGET_TOPIC=some_topic
- SEND_DELAY=10
- VALUE_MIN=0
- VALUE_MAX=100
ports:
- 8080:8080

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#!/usr/bin/env bash
#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
# Start prometheus endpoint in background
./simple-prometheus-exporter.sh &
# Start simple-app to send messages to broker
python simple-app.py

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docopt==0.6.2
stomp.py==8.1.0
websocket-client==1.7.0

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#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
import stomp
import time
import calendar
import random
import json
import os
import sys
BROKER_SERVER=os.environ.get('BROKER_SERVER')
BROKER_PORT=int(os.environ.get('BROKER_PORT', 61610))
BROKER_USERNAME=os.environ.get('BROKER_USERNAME')
BROKER_PASSWORD=os.environ.get('BROKER_PASSWORD')
RETRY_CONNECT=os.environ.get('RETRY_CONNECT', 5)
TARGET_TOPIC='/topic/' + os.environ.get('TARGET_TOPIC', 'simple')
SEND_DELAY=int(os.environ.get('SEND_DELAY', 10))
VALUE_MIN=float(os.environ.get('VALUE_MIN', 0))
VALUE_MAX=float(os.environ.get('VALUE_MAX', 100))
class MyListener(stomp.ConnectionListener):
def __init__(self, conn):
self.conn = conn
def on_error(self, frame):
print("on_error %s %s", frame.headers, frame.body)
def on_message(self, frame):
print("Received ",frame.body)
def on_disconnected(self):
print('disconnected')
def eprint(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
while True:
try:
print(f'Connecting to broker: {BROKER_SERVER}:{BROKER_PORT}, as user: {BROKER_USERNAME}...')
sys.stdout.flush()
conn = stomp.Connection([(BROKER_SERVER, BROKER_PORT)])
conn.set_listener('', MyListener(conn))
conn.connect(BROKER_USERNAME, BROKER_PASSWORD, wait=True)
print('Connected')
print(f'Sending messages to topic: {TARGET_TOPIC}, every {SEND_DELAY}s. Value range: [{VALUE_MIN}..{VALUE_MAX}]')
sys.stdout.flush()
while True:
timestamp = calendar.timegm(time.gmtime())
# message = '{ "metricValue": '+str(random.randint(VALUE_MIN, VALUE_MAX))+', "level": 1, "timestamp": '+str(timestamp)+' }'
payload_body = {
"metricValue": random.uniform(VALUE_MIN, VALUE_MAX),
"level": 1,
"timestamp": timestamp
}
message = json.dumps(payload_body)
print(f"Sending {message}")
sys.stdout.flush()
conn.send(TARGET_TOPIC, message, headers={'type':'textMessage', 'amq-msg-type':'text'})
time.sleep(SEND_DELAY)
except:
eprint("Error:", sys.exc_info()[0])
eprint(f"Re-connect in {RETRY_CONNECT}s")
sys.stderr.flush()
time.sleep(RETRY_CONNECT)

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#!/bin/bash
#
# Copyright (C) 2017-2025 Institute of Communication and Computer Systems (imu.iccs.gr)
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
# If a copy of the MPL was not distributed with this file, You can obtain one at
# https://www.mozilla.org/en-US/MPL/2.0/
#
DATE=`command -v date`
CUT=`command -v cut`
SHUF=`command -v shuf`
OD=`command -v od`
NC=`command -v nc`
GREP=`command -v grep`
PORT=8080
PATH="/metrics"
METRIC_NAME="random_number"
METRIC_HELP="Random number sequences, generated using various methods (check the labels)"
METRIC_TYPE="gauge"
# Bash/Nc-based Web server
# See: https://funprojects.blog/2021/04/11/a-web-server-in-1-line-of-bash/
echo "Starting prometheus endpoint on port ${PORT}"
while true;
#for i in {1..5}
do
REQUEST_PATH=$( {
echo "HTTP/1.1 200 OK"
echo "Content-Type: text/plain; version=0.0.4"
echo -e ""
echo "# HELP ${METRIC_NAME} ${METRIC_HELP}"
echo "# TYPE ${METRIC_NAME} ${METRIC_TYPE}"
TIMESTAMP=`$DATE +%s%N | $CUT -b1-13`;
RND1=`$SHUF -i 0-255 -n 1`;
RND2=`$OD -A n -t d -N 1 /dev/urandom`;
RND2="${RND2#"${RND2%%[![:space:]]*}"}"
RND2="${RND2%"${RND2##*[![:space:]]}"}"
echo "${METRIC_NAME}{method=\"shuf\"} ${RND1} ${TIMESTAMP}"
echo "${METRIC_NAME}{method=\"urandom\"} ${RND2} ${TIMESTAMP}"
} \
| $NC -l -k -p ${PORT} -q 1 \
| $GREP "GET /" ; )
echo $REQUEST_PATH
# if [[ $REQUEST_PATH =~ ^GET\ /exit\ .* ]]; then
# break
# fi
done
echo "Prometheus exporter exited."