[issue #1] common provider for one or more nodes

* groups components with the same `provider` attribute (see examples)
* add the new attribute `impl` to all components (see examples)
* change microservice shape to 'octagon'
* layout README file

Author: lucasepe

README.md

@@ -31,27 +31,32 @@ To install GraphViz to your favorite OS, please, follow this link [https://graph
 
 ## Components
 
-### A picture is worth a thousand words 
+> a picture is worth a thousand words 
 
 ... and this is particularly true in regard to complex IT architectures. 
 
 The basic unit of each _draft_ design is the `component`:
 
 ```go
 type Component struct {
-	ID        string `yaml:"id,omitempty"`        // optional - autogenerated if omitted (read more for details...)
-	Kind      string `yaml:"kind"`                // required (one of: service, gateway, queue, broker, function, storage, database)
-	Label     string `yaml:"label,omitempty"`     // optional - the component description (or scope)  
-	Provider  string `yaml:"provider,omitempty"`  // optional - you can use this to specify the implementation
-	FillColor string `yaml:"fillColor,omitempty"` // optional - the hex code for the background color 
-	FontColor string `yaml:"fontColor,omitempty"` // optional - the hex code for the foreground color
-	Rounded   bool   `yaml:"rounded,omitempty"`   // optional - set to true if you wants rounded shapes
+  ID        string `yaml:"id,omitempty"`        // optional - autogenerated if omitted (read more for details...)
+  Kind      string `yaml:"kind"`                // required (one of: service, gateway, queue, broker, function, storage, database)
+  Label     string `yaml:"label,omitempty"`     // optional - the component description (or scope)  
+  Provider  string `yaml:"provider,omitempty"`  // optional - you can use this to specify the cloud provider
+  Impl      string `yaml:"impl,omitempty"`      // optional - you can use this to specify the implementation
+  FillColor string `yaml:"fillColor,omitempty"` // optional - the hex code for the background color 
+  FontColor string `yaml:"fontColor,omitempty"` // optional - the hex code for the foreground color
+  Rounded   bool   `yaml:"rounded,omitempty"`   // optional - set to true if you wants rounded shapes
 }
 ```
 
 Draft uses a set of symbols independent from the different providers (AWS, Microsoft Azure, GCP).
 
-- you can eventually describe the implementation using the `provider` attribute.
+Eventually you can describe...
+
+- the implementation using the `impl` attribute (ie: _impl: 'SQS'_)
+- the cloud provider using the `provider` attribute (ie: _provider: AWS_)
+  - 💡 components with the same provider will be 'grouped'
 
 Below is a list of all the components currently implemented.
 
@@ -66,18 +71,14 @@ Below is a list of all the components currently implemented.
 | **Function**       | `function`  | ![](./examples/fn.jpg)    | ![](./examples/function.png)     |
 | **Database**       | `database`  | ![](./examples/db.jpg)    | ![](./examples/database.png)     |
 
-## Connections
+### Notes about a component `id`
 
-You can connect each component by arrows.
+- you can define your component `id` explicitly (i.e. _id: MY_SERVICE_A_)
+- or you can omit the component `id` attribute and it will be autogenerated
 
-To be able to connect an _origin component_ with one or more _target component_ you need to specify each `componentId`.
+#### How is auto-generated a component `id`?
 
-- you can define your component `id` explicitly
-- you can omit the component `id` attribute and it will be autogenerated
-
-### Autogenerated `id`
-
-An autogenerated `id` has a prefix and a sequential number
+An auto-generated component `id` has a prefix and a sequential number
 
 - the prefix is related to the component `kind`
 
@@ -92,6 +93,12 @@ An autogenerated `id` has a prefix and a sequential number
 | `function`   | fn                                   | _fn1, fn2,..._ |
 | `database`   | db                                   | _db1, db2,..._ |
 
+## Connections
+
+You can connect each component by arrows.
+
+To be able to connect an _origin component_ with one or more _target component_ you need to specify each `componentId`.
+
 A `connection` has the following properties:
 
 ```go
@@ -112,191 +119,52 @@ type Connection struct {
 
 ## Example 1 - Message Bus Pattern
 
-Create the `draft` architecture descriptor YAML with your favorite editor:
-
-```yaml
-title: message bus pattern 
-backgroundColor: '#ffffff'
-components:
-  - 
-    kind: service
-    label: Producer
-    provider: AWS EC2
-  -
-    kind: broker
-    label: "Notification\nService"
-    provider: AWS SNS
-  -
-    kind: queue
-    label: "event queue @ topic 1"
-    provider: AWS SQS
-  -
-    kind: queue
-    label: "event queue @ topic 2"
-    provider: AWS SQS
-  -
-    kind: service
-    label: "Consumer\n@ topic 1"
-    provider: AWS EC2
-  -
-    kind: service
-    label: "Consumer\n@ topic 2"
-    provider: AWS EC2
-connections:
-  -
-    origin: 
-      componentId: ms1
-    targets:
-      -
-        componentId: br1
-  -
-    origin:
-      componentId: br1
-    targets:
-      -
-        componentId: qs1
-        dashed: true
-      -
-        componentId: qs2
-        dashed: true
-  -
-    origin:
-      componentId: qs1
-    targets:
-      -
-        componentId: ms2
-        dir: back
-  -
-    origin: 
-      componentId: qs2
-    targets:
-      -
-        componentId: ms3
-        dir: back
-```
+The `draft` architecture descriptor YAML file is here 👉 [./examples/message-bus-pattern.yml](./examples/message-bus-pattern.yml)
 
-Then run `draft`:
+Running `draft` with this command:
 
 ```bash
 draft message-bus-pattern.yml | dot -Tpng > message-bus-pattern.png
 ```
 
-Here the generated output:
+Will generate this output:
 
 ![](./examples/message-bus-pattern.png)
 
 
 ## Example 2 - AWS Cognito Custom Authentication Flow
 
-Create the draft architecture descriptor YAML with your favorite editor:
-
-```yaml
-title: Amazon Cognito Custom Authentication Flow with external database
-backgroundColor: '#ffffff'
-components:
-  -
-    kind: client
-    label: "Web App"
-  -
-    kind: client
-    label: "Mobile App"
-  -
-    kind: service
-    label: "Cognito"
-    provider: "AWS Cognito"
-    fillColor: '#991919'
-    fontColor: '#fafafa'
-  -
-    kind: function
-    label: "Define\nAuthChallange"
-    provider: "AWS Lambda"
-  -
-    kind: function
-    label: "Create\nAuthChallange"
-    provider: "AWS Lambda"
-  -
-    kind: function
-    label: "Verify\nAuthChallange"
-    provider: "AWS Lambda"
-  -
-    kind: database
-    label: "Users\nRepository"
-    provider: "AWS RDS"
-connections:
-  -
-    origin:
-      componentId: cl1
-    targets:
-      -
-        componentId: ms1
-  -
-    origin:
-      componentId: cl2
-    targets:
-      -
-        componentId: ms1
-  -
-    origin:
-      componentId: ms1
-    targets:
-      -
-        componentId: fn1
-      -
-        componentId: fn2
-      -
-        componentId: fn3
-  -
-    origin:
-      componentId: fn2
-    targets:
-      -
-        componentId: db1
+The `draft` architecture descriptor YAML file is here 👉 [./examples/aws-cognito-custom-auth-flow.yml](./examples/aws-cognito-custom-auth-flow.yml)
+
+Running `draft` with this command:
+
+```bash
+draft aws-cognito-custom-auth-flow.yml | dot -Tpng > aws-cognito-custom-auth-flow.png
 ```
 
-Here the generated output:
+Will generate this output:
 
 ![](./examples/aws-cognito-custom-auth-flow.png)
 
 ## Example 3 - Getting the pre-signed URL to Upload a file to Amazon S3
 
-```yaml
-title: Upload file to S3 using Lambda for pre-signed URL
-backgroundColor: '#ffffff'
-components:
-  -
-    kind: client
-    label: "Web App"
-    provider: SPA
-  -
-    kind: gateway
-    provider: "AWS API Gateway"
-  -
-    kind: function
-    label: "Get\nPre-Signed URL"
-    provider: "AWS Lambda"
-  -
-    kind: storage
-    label: "*.jpg\n*.png"
-    provider: "AWS S3"
-connections:
-  -
-    origin:
-      componentId: cl1
-    targets:
-      -
-        componentId: gt1
-  -
-    origin:
-      componentId: gt1
-    targets:
-      -
-        componentId: fn1
-  -
-    origin:
-      componentId: fn1
-    targets:
-      -
-        componentId: st1
+
+The `draft` architecture descriptor YAML file is here 👉 [./examples/s3-upload-presigned-url.yml](./examples/s3-upload-presigned-url.yml)
+
+Running `draft` with this command:
+
+```bash
+draft s3-upload-presigned-url.yml | dot -Tpng > s3-upload-presigned-url.png
 ```
 
-![](./examples/s3-upload-presigned-url.png)
+![](./examples/s3-upload-presigned-url.png)
+
+## Others examples
+
+Check out the  👉 [./examples/](/examples/) folders for more `draft` architecture descriptor YAML examples.
+
+
+
+---
+
+(c) 2020 Luca Sepe http://lucasepe.it. MIT License

broker.go

@@ -26,10 +26,10 @@ func (rcv *broker) sketch(graph *dot.Graph, comp Component) {
 
 	label := comp.Label
 	if strings.TrimSpace(comp.Label) == "" {
-		label = "Message Broker"
+		label = "Message\nBroker"
 	}
 
-	cl := cluster.New(graph, id, cluster.Label(comp.Provider))
+	cl := cluster.New(graph, id, cluster.Label(comp.Impl))
 
 	el := node.New(cl, id,
 		node.Label(label),
@@ -38,7 +38,8 @@ func (rcv *broker) sketch(graph *dot.Graph, comp Component) {
 		node.FillColor(comp.FillColor, "#e0eeeeff"),
 		node.Shape("cds"),
 	)
-	el.Attr("height", "0.8")
+	el.Attr("height", "0.6")
+	el.Attr("width", "1.2")
 }
 
 /** Alternative

client.go

@@ -24,7 +24,7 @@ func (rcv *client) sketch(graph *dot.Graph, comp Component) {
 		id = rcv.nextID()
 	}
 
-	cl := cluster.New(graph, id, cluster.Label(comp.Provider))
+	cl := cluster.New(graph, id, cluster.Label(comp.Impl))
 
 	el := node.New(cl, id,
 		node.Label(comp.Label),

database.go

@@ -24,7 +24,7 @@ func (rcv *database) sketch(graph *dot.Graph, comp Component) {
 		id = rcv.nextID()
 	}
 
-	cl := cluster.New(graph, id, cluster.Label(comp.Provider))
+	cl := cluster.New(graph, id, cluster.Label(comp.Impl))
 
 	el := node.New(cl, id,
 		node.Label(comp.Label),

draft.go

@@ -3,8 +3,10 @@ package draft
 import (
 	"fmt"
 	"io"
+	"strings"
 
 	"github.com/emicklei/dot"
+	"github.com/lucasepe/draft/pkg/cluster"
 	"github.com/lucasepe/draft/pkg/edge"
 	"github.com/lucasepe/draft/pkg/graph"
 	"gopkg.in/yaml.v2"
@@ -41,6 +43,7 @@ type Component struct {
 	ID        string `yaml:"id,omitempty"`
 	Kind      string `yaml:"kind"`
 	Label     string `yaml:"label,omitempty"`
+	Impl      string `yaml:"impl,omitempty"`
 	Provider  string `yaml:"provider,omitempty"`
 	FillColor string `yaml:"fillColor,omitempty"`
 	FontColor string `yaml:"fontColor,omitempty"`
@@ -109,7 +112,16 @@ func sketchComponents(graph *dot.Graph, draft *Draft) error {
 			return fmt.Errorf("render not found for component of kind '%s'", el.Kind)
 		}
 
-		sketcher.sketch(graph, el)
+		parent := graph
+		if strings.TrimSpace(el.Provider) != "" {
+			parent = cluster.New(graph, el.Provider,
+				cluster.PenColor("#d9cc31"),
+				cluster.FontName("Fira Mono"),
+				cluster.FontSize(10),
+				cluster.FontColor("#63625b"))
+		}
+
+		sketcher.sketch(parent, el)
 	}
 
 	return nil