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54 lines
1.9 KiB
54 lines
1.9 KiB
---
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id: edge
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title: Edges
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---
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Edge is representing an edge between Nodes.
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## Basic
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Edge is an object representing a connection between Nodes with some additional properties.
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An edge object contains three attributes: **label**, **color** and **style** which mirror corresponding graphviz edge attributes.
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```python
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from diagrams import Cluster, Diagram, Edge
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from diagrams.onprem.analytics import Spark
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from diagrams.onprem.compute import Server
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from diagrams.onprem.database import PostgreSQL
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from diagrams.onprem.inmemory import Redis
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from diagrams.onprem.logging import Fluentd
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from diagrams.onprem.monitoring import Grafana, Prometheus
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from diagrams.onprem.network import Nginx
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from diagrams.onprem.queue import Kafka
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with Diagram(name="Advanced Web Service with On-Premise (colored)", show=False):
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ingress = Nginx("ingress")
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metrics = Prometheus("metric")
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metrics << Edge(color="firebrick", style="dashed") << Grafana("monitoring")
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with Cluster("Service Cluster"):
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grpcsvc = [
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Server("grpc1"),
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Server("grpc2"),
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Server("grpc3")]
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with Cluster("Sessions HA"):
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master = Redis("session")
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master - Edge(color="brown", style="dashed") - Redis("replica") << Edge(label="collect") << metrics
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grpcsvc >> Edge(color="brown") >> master
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with Cluster("Database HA"):
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master = PostgreSQL("users")
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master - Edge(color="brown", style="dotted") - PostgreSQL("slave") << Edge(label="collect") << metrics
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grpcsvc >> Edge(color="black") >> master
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aggregator = Fluentd("logging")
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aggregator >> Edge(label="parse") >> Kafka("stream") >> Edge(color="black", style="bold") >> Spark("analytics")
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ingress >> Edge(color="darkgreen") << grpcsvc >> Edge(color="darkorange") >> aggregator
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```
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