Add sample flows with readme

Signed-off-by: s8sg <[email protected]>

eventhandler/trace_handler.go

@@ -107,6 +107,10 @@ func (tracerObj *TraceHandler) StartNodeSpan(node string, reqID string) {
 // StopNodeSpan terminates a node span
 func (tracerObj *TraceHandler) StopNodeSpan(node string) {
 
+	if tracerObj.nodeSpans[node] == nil {
+		return
+	}
+
 	tracerObj.nodeSpans[node].Finish()
 }
 

samples/.gitignore

@@ -0,0 +1 @@
+examples

samples/Makefile

@@ -1,15 +1,5 @@
-all: compile 
+all: clean compile
 clean:
-	@rm flow
-setup:
-	@sudo docker run -p 6379:6379 -d redis
-
+	@rm examples || true
 compile:
-	@go build -o flow
-run: setup
-	./flow &
-check:
-	@curl -d "Hell World" localhost:8080/myflow
-	@echo "\n"
-shutdown:
-	@docker ps | awk -F ' ' '{ print $1 }' | tail -n 1 | xargs docker stop
+	@go build -o examples

samples/README.md

@@ -0,0 +1,36 @@
+# Samples
+This section list a few example that demonstrates different patterns in goflow.  
+
+Examples:
+
+| **Name**                            | **Description**         |
+|-------------------------------------|:------------------------|
+| [single](single/single.go)          | Single node             |
+| [serial](serial/serial.go)          | Serial sequential nodes |
+| [parallel](parallel/parallel.go)    | Parallel nodes          |
+| [condition](condition/condition.go) | Conditional nodes       |
+
+
+## How to run
+Build
+```bash
+make
+```
+Run dependencies
+```bash
+docker-compose down && docker-compose up -d
+```
+Run flow
+```
+./examples
+```
+
+## How to execute
+Execute with curl
+```bash
+curl -d hello localhost:8080/<name>
+```
+For example to execute `parallel` flow
+```bash
+curl -d hello localhost:8080/parallel
+```

samples/condition/condition.go

@@ -0,0 +1,77 @@
+package condition
+
+import (
+	"fmt"
+	flow "github.com/s8sg/goflow/flow/v1"
+	"math/rand"
+)
+
+const (
+	CASE1 = "case1"
+	CASE2 = "case2"
+)
+
+// Workload function
+func node1(data []byte, option map[string][]string) ([]byte, error) {
+	result := fmt.Sprintf("(Executing node 1 with data (%s))", string(data))
+	fmt.Println(result)
+	return []byte(result), nil
+}
+
+// Condition determine the condition branch to take
+// by returning the list of all matched conditions
+func conditionCheck(response []byte) []string {
+	result := CASE1
+	if rand.Int()%2 == 0 {
+		result = CASE2
+	}
+	fmt.Println("Matched condition: " + result)
+	return []string{result}
+}
+
+// Workload function to handle case1
+func handleCase1(data []byte, option map[string][]string) ([]byte, error) {
+	result := fmt.Sprintf("(Executing case 1 with data (%s))", string(data))
+	fmt.Println(result)
+	return []byte(result), nil
+}
+
+// Workload function to handle case 2
+func handleCase2(data []byte, option map[string][]string) ([]byte, error) {
+	result := fmt.Sprintf("(Executing case 2 with data (%s))", string(data))
+	fmt.Println(result)
+	return []byte(result), nil
+}
+
+// Workload function
+func result(data []byte, option map[string][]string) ([]byte, error) {
+	result := fmt.Sprintf("(Executing result with data (%s))", string(data))
+	fmt.Println(result)
+	return []byte(result), nil
+}
+
+// conditionAggregator can be used to collect and map response from multiple in-degree as a request to node
+// here conditionAggregator aggregates the result from different condition branches before forwarding
+// it to the next node in the dag
+func conditionAggregator(data map[string][]byte) ([]byte, error) {
+	case1Data, _ := data["case1"]
+	case2Data, _ := data["case2"]
+	aggregatedResult := fmt.Sprintf("(case1: %s, case2: %s)", case1Data, case2Data)
+	return []byte(aggregatedResult), nil
+}
+
+// DefineWorkflow Define provide definition of the workflow
+func DefineWorkflow(workflow *flow.Workflow, context *flow.Context) error {
+	dag := workflow.Dag()
+	dag.Node("node1", node1)
+	branches := dag.ConditionalBranch("condition",
+		[]string{CASE1, CASE2},
+		conditionCheck,
+		flow.Aggregator(conditionAggregator))
+	branches[CASE1].Node("case1", handleCase1)
+	branches[CASE2].Node("case2", handleCase2)
+	dag.Node("result", result)
+	dag.Edge("node1", "condition")
+	dag.Edge("condition", "result")
+	return nil
+}

samples/examples.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"fmt"
+	"github.com/s8sg/goflow/samples/condition"
+	"github.com/s8sg/goflow/samples/loop"
+	"github.com/s8sg/goflow/samples/parallel"
+	"github.com/s8sg/goflow/samples/serial"
+	"github.com/s8sg/goflow/samples/single"
+
+	goflow "github.com/s8sg/goflow/v1"
+)
+
+func main() {
+	fs := &goflow.FlowService{
+		Port:              8080,
+		RedisURL:          "localhost:6379",
+		OpenTraceUrl:      "localhost:5775",
+		WorkerConcurrency: 5,
+		EnableMonitoring:  true,
+		DebugEnabled:      true,
+	}
+	fs.Register("single", single.DefineWorkflow)
+	fs.Register("serial", serial.DefineWorkflow)
+	fs.Register("parallel", parallel.DefineWorkflow)
+	fs.Register("condition", condition.DefineWorkflow)
+	fs.Register("loop", loop.DefineWorkflow)
+	fmt.Println(fs.Start())
+}

samples/go.mod

@@ -0,0 +1,24 @@
+module github.com/s8sg/goflow/samples
+
+go 1.20
+
+require github.com/s8sg/goflow v0.1.2
+
+require (
+	github.com/adjust/rmq/v4 v4.0.0 // indirect
+	github.com/alexellis/hmac v0.0.0-20180624211220-5c52ab81c0de // indirect
+	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/go-redis/redis v6.15.5+incompatible // indirect
+	github.com/go-redis/redis/v8 v8.3.2 // indirect
+	github.com/jasonlvhit/gocron v0.0.1 // indirect
+	github.com/julienschmidt/httprouter v1.3.0 // indirect
+	github.com/opentracing/opentracing-go v1.2.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rs/xid v1.2.1 // indirect
+	github.com/uber/jaeger-client-go v2.25.0+incompatible // indirect
+	github.com/uber/jaeger-lib v2.2.0+incompatible // indirect
+	go.opentelemetry.io/otel v0.13.0 // indirect
+	go.uber.org/atomic v1.6.0 // indirect
+	gopkg.in/redis.v5 v5.2.9 // indirect
+)

samples/go.sum

@@ -0,0 +1,132 @@
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