[library-chart] PostgreSQL discovery

Author: Gaspi

charts/library-chart/Chart.yaml

@@ -1,4 +1,4 @@
 apiVersion: v2
 name: library-chart
-version: 1.7.6
+version: 1.7.7
 type: library

charts/library-chart/templates/_notes.tpl

@@ -196,6 +196,13 @@ It is possible to associate an initialization script with your service to set up
 </details>
 {{ end -}}
 
+{{- with (include "library-chart.postgresql-discovery-help" .) }}
+<details>
+  <summary>PostgreSQL</summary>
+{{ . }}
+</details>
+{{ end -}}
+
 {{- with (include "library-chart.metaflow-discovery-help" .) }}
 <details>
   <summary>Metaflow</summary>

charts/library-chart/templates/_secret_postgresql_discovery.tpl

@@ -0,0 +1,62 @@
+{{/* Create the name of the secret PostgreSQL to use */}}
+{{- define "library-chart.secretNamePostgreSQL" -}}
+{{- if (.Values.discovery).postgresql }}
+{{- $name := printf "%s-secretpostgresql" (include "library-chart.fullname" .) }}
+{{- default $name (.Values.postgresql).secretName }}
+{{- else }}
+{{- default "default" (.Values.postgresql).secretName }}
+{{- end }}
+{{- end }}
+
+
+{{/* Secret for PostgreSQL */}}
+{{- define "library-chart.secretPostgreSQL" }}
+{{- $context := . }}
+{{- if (.Values.discovery).postgresql }}
+{{- with $secretData := first (include "library-chart.getOnyxiaDiscoverySecrets" (list .Release.Namespace "postgres") | fromJsonArray) -}}
+{{- $pg_service  := index $secretData "postgres-service"  | default "" | b64dec }}
+{{- $pg_port     := index $secretData "postgres-port"     | default "" | b64dec }}
+{{- $pg_database := index $secretData "postgres-database" | default "" | b64dec }}
+{{- $pg_username := index $secretData "postgres-username" | default "" | b64dec }}
+{{- $pg_password := index $secretData "password"          | default "" | b64dec }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ include "library-chart.secretNamePostgreSQL" $context }}
+  labels:
+    {{- include "library-chart.labels" $context | nindent 4 }}
+stringData:
+  PGHOST: "http://{{ $pg_service }}"
+  PGPORT: {{ $pg_port | quote }}
+  PGDATABASE: {{ $pg_database | quote }}
+  PGUSER: {{ $pg_username | quote }}
+  PGPASSWORD: {{ $pg_password | quote }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+
+{{- define "library-chart.postgresql-discovery-help" -}}
+{{- if (.Values.discovery).postgresql }}
+{{- if first (include "library-chart.getOnyxiaDiscoverySecrets" (list .Release.Namespace "postgres") | fromJsonArray) }}
+The connection to your PostgreSQL service is already preconfigured in your service.
+{{- if regexMatch "^r|r$" .Chart.Name }}
+```r
+library(DBI)
+conn <- dbConnect(RPostgres::Postgres())
+print(dbGetQuery(conn, "SELECT version();"))
+dbDisconnect(conn)
+```
+{{- else }}
+A client can be created in a Python script or interactive console:
+```python
+import psycopg
+conn = psycopg.connect()
+with conn.cursor() as cur:
+    print(cur.execute("SELECT version();").fetchone())
+conn.close()
+```
+{{- end }}
+{{- end }}
+{{- end }}
+{{- end -}}