Golang框架实战-KisFlow流式计算框架专栏

Golang框架实战-KisFlow流式计算框架(1)-概述
Golang框架实战-KisFlow流式计算框架(2)-项目构建/基础模块-(上)
Golang框架实战-KisFlow流式计算框架(3)-项目构建/基础模块-(下)
Golang框架实战-KisFlow流式计算框架(4)-数据流
Golang框架实战-KisFlow流式计算框架(5)-Function调度
Golang框架实战-KisFlow流式计算框架(6)-Connector
Golang框架实战-KisFlow流式计算框架(7)-配置导入与导出
Golang框架实战-KisFlow流式计算框架(8)-KisFlow Action
Golang框架实战-KisFlow流式计算框架(9)-Cache/Params 数据缓存与数据参数
Golang框架实战-KisFlow流式计算框架(10)-Flow多副本
Golang框架实战-KisFlow流式计算框架(11)-Prometheus Metrics统计
Golang框架实战-KisFlow流式计算框架(12)-基于反射自适应注册FaaS形参类型

案例：
KisFlow-Golang流式计算案例(一)快速开始QuickStart
KisFlow-Golang流式计算案例(二)-Flow并流操作
KisFlow-Golang流式计算案例(二)-KisFlow在多协程中的应用

---

DownLoad kis-flow source

$go get github.com/aceld/kis-flow

《KisFlow开发者文档》

1. KisFlow快速开始(使用配置文件)

案例源代码： kis-flow-usage/2-quick_start_with_config at main · aceld/kis-flow-usage

首先我们创建一个项目，项目的文件路径如下：

项目目录

├── Makefile
├── conf
│   ├── flow-CalStuAvgScore.yml
│   ├── func-AvgStuScore.yml
│   └── func-PrintStuAvgScore.yml
├── faas_stu_score_avg.go
├── faas_stu_score_avg_print.go
└── main.go

Flow

定义当前的Flow，当前的Flow名称为："CalStuAvgScore",这是一个计算学生平均分值的数据流。

定义两个Function，Function1为：Calculate，是计算学生平均分的逻辑，Function2为Expand 为打印最终结果。

Config

有关Flow和Function的配置文件如下。

(1) Flow Config

conf/flow-CalStuAvgScore.yml

kistype: flow
status: 1
flow_name: CalStuAvgScore
flows:
 - fname: AvgStuScore
 - fname: PrintStuAvgScore

(2) Function1 Config

conf/func-AvgStuScore.yml

kistype: func
fname: AvgStuScore
fmode: Calculate
source:
 name: 学生学分
 must:
 - stu_id

(3) Function2(Slink) Config

conf/func-PrintStuAvgScore.yml

kistype: func
fname: PrintStuAvgScore
fmode: Expand
source:
 name: 学生学分
 must:
 - stu_id

Main

接下来是主逻辑，主要分成三步骤：

• 加载配置文件，获取Flow实例;
• 提交数据;
• 运行Flow。

main.go

package main

import (
    "context"
    "fmt"

    "github.com/aceld/kis-flow/file"
    "github.com/aceld/kis-flow/kis"
)

func main() {
    ctx := context.Background()

    // Load Configuration from file
    if err := file.ConfigImportYaml("conf/"); err != nil {
        panic(err)

    }

    // Get the flow
    flow1 := kis.Pool().GetFlow("CalStuAvgScore")
    if flow1 == nil {
        panic("flow1 is nil")

    }

    // Submit a string
    _ = flow1.CommitRow(`{"stu_id":101, "score_1":100, "score_2":90, "score_3":80}`)
    // Submit a string
    _ = flow1.CommitRow(`{"stu_id":102, "score_1":100, "score_2":70, "score_3":60}`)

    // Run the flow
    if err := flow1.Run(ctx); err != nil {
        fmt.Println("err: ", err)

    }

    return
}

Function1

第一个计算流程的实现逻辑如下, AvgStuScoreIn 为输入数据类型，当前有三个学分，AvgStuScoreOut为输出数据类型，为平均分值。

faas_stu_score_avg.go

package main
import (
    "context"
    "github.com/aceld/kis-flow/kis"
    "github.com/aceld/kis-flow/serialize"

)
type AvgStuScoreIn struct {
    serialize.DefaultSerialize
    StuId  int `json:"stu_id"`
    Score1 int `json:"score_1"`
    Score2 int `json:"score_2"`
    Score3 int `json:"score_3"`

}
type AvgStuScoreOut struct {
    serialize.DefaultSerialize
    StuId    int     `json:"stu_id"`
    AvgScore float64 `json:"avg_score"`

// AvgStuScore(FaaS) 计算学生平均分
func AvgStuScore(ctx context.Context, flow kis.Flow, rows []*AvgStuScoreIn) error {

    for _, row := range rows {
        out := AvgStuScoreOut{
            StuId:    row.StuId,
            AvgScore: float64(row.Score1+row.Score2+row.Score3) / 3,
        }
        // 提交结果数据
        _ = flow.CommitRow(out)


    }
    return nil
}

Function2

打印的计算逻辑为直接打印数据即可，如下。

faas_stu_score_avg_print.go

package main

import (
    "context"
    "fmt"
    "github.com/aceld/kis-flow/kis"
    "github.com/aceld/kis-flow/serialize"

)

type PrintStuAvgScoreIn struct {
    serialize.DefaultSerialize
    StuId    int     `json:"stu_id"`
    AvgScore float64 `json:"avg_score"`
}

type PrintStuAvgScoreOut struct {
    serialize.DefaultSerialize
}

func PrintStuAvgScore(ctx context.Context, flow kis.Flow, rows []*PrintStuAvgScoreIn) error {
    for _, row := range rows {
        fmt.Printf("stuid: [%+v], avg score: [%+v]\n", row.StuId, row.AvgScore)

    }
    return nil
}

OutPut

最后运行程序，得到结果如下：

Add KisPool FuncName=AvgStuScore
Add KisPool FuncName=PrintStuAvgScore
Add FlowRouter FlowName=CalStuAvgScore
stuid: [101], avg score: [90]
stuid: [102], avg score: [76.66666666666667]</pre>

2. KisFlow快速开始（使用原生接口，动态配置）

案例源代码： kis-flow-usage/1-quick_start at main · aceld/kis-flow-usage

项目目录

├── faas_stu_score_avg.go
├── faas_stu_score_avg_print.go
└── main.go

Flow

Main

main.go

package main

import (
    "context"
    "fmt"
    "github.com/aceld/kis-flow/common"
    "github.com/aceld/kis-flow/config"
    "github.com/aceld/kis-flow/flow"
    "github.com/aceld/kis-flow/kis"
)

func main() {
    ctx := context.Background()

    // Create a new flow configuration
    myFlowConfig1 := config.NewFlowConfig("CalStuAvgScore", common.FlowEnable)

    // Create new function configuration
    avgStuScoreConfig := config.NewFuncConfig("AvgStuScore", common.C, nil, nil)
    printStuScoreConfig := config.NewFuncConfig("PrintStuAvgScore", common.E, nil, nil)

    // Create a new flow
    flow1 := flow.NewKisFlow(myFlowConfig1)

    // Link functions to the flow
    _ = flow1.Link(avgStuScoreConfig, nil)
    _ = flow1.Link(printStuScoreConfig, nil)

    // Submit a string
    _ = flow1.CommitRow(`{"stu_id":101, "score_1":100, "score_2":90, "score_3":80}`)
    // Submit a string
    _ = flow1.CommitRow(`{"stu_id":102, "score_1":100, "score_2":70, "score_3":60}`)

    // Run the flow
    if err := flow1.Run(ctx); err != nil {
        fmt.Println("err: ", err)
    }

    return
}

func init() {
    // Register functions
    kis.Pool().FaaS("AvgStuScore", AvgStuScore)
    kis.Pool().FaaS("PrintStuAvgScore", PrintStuAvgScore)
}

Function1

faas_stu_score_avg.go

package main

import (
    "context"
    "github.com/aceld/kis-flow/kis"
    "github.com/aceld/kis-flow/serialize"
)

type AvgStuScoreIn struct {
    serialize.DefaultSerialize
    StuId  int `json:"stu_id"`
    Score1 int `json:"score_1"`
    Score2 int `json:"score_2"`
    Score3 int `json:"score_3"`
}

type AvgStuScoreOut struct {
    serialize.DefaultSerialize
    StuId    int     `json:"stu_id"`
    AvgScore float64 `json:"avg_score"`
}

// AvgStuScore(FaaS) 计算学生平均分
func AvgStuScore(ctx context.Context, flow kis.Flow, rows []*AvgStuScoreIn) error {
    for _, row := range rows {

        out := AvgStuScoreOut{
            StuId:    row.StuId,
            AvgScore: float64(row.Score1+row.Score2+row.Score3) / 3,
        }

        // 提交结果数据
        _ = flow.CommitRow(out)
    }

    return nil
}

Function2

faas_stu_score_avg_print.go

package main

import (
    "context"
    "fmt"
    "github.com/aceld/kis-flow/kis"
    "github.com/aceld/kis-flow/serialize"
)

type PrintStuAvgScoreIn struct {
    serialize.DefaultSerialize
    StuId    int     `json:"stu_id"`
    AvgScore float64 `json:"avg_score"`
}

type PrintStuAvgScoreOut struct {
    serialize.DefaultSerialize
}

func PrintStuAvgScore(ctx context.Context, flow kis.Flow, rows []*PrintStuAvgScoreIn) error {

    for _, row := range rows {
        fmt.Printf("stuid: [%+v], avg score: [%+v]\n", row.StuId, row.AvgScore)
    }

    return nil
}

OutPut

Add KisPool FuncName=AvgStuScore
Add KisPool FuncName=PrintStuAvgScore
funcName NewConfig source is nil, funcName = AvgStuScore, use default unNamed Source.
funcName NewConfig source is nil, funcName = PrintStuAvgScore, use default unNamed Source.
stuid: [101], avg score: [90]
stuid: [102], avg score: [76.66666666666667]

---

作者:刘丹冰Aceld github: https://github.com/aceld
KisFlow开源项目地址：https://github.com/aceld/kis-flow

Golang框架实战-KisFlow流式计算框架专栏

Golang框架实战-KisFlow流式计算框架(1)-概述
Golang框架实战-KisFlow流式计算框架(2)-项目构建/基础模块-(上)
Golang框架实战-KisFlow流式计算框架(3)-项目构建/基础模块-(下)
Golang框架实战-KisFlow流式计算框架(4)-数据流
Golang框架实战-KisFlow流式计算框架(5)-Function调度
Golang框架实战-KisFlow流式计算框架(6)-Connector
Golang框架实战-KisFlow流式计算框架(7)-配置导入与导出
Golang框架实战-KisFlow流式计算框架(8)-KisFlow Action
Golang框架实战-KisFlow流式计算框架(10)-Flow多副本
Golang框架实战-KisFlow流式计算框架(11)-Prometheus Metrics统计
Golang框架实战-KisFlow流式计算框架(12)-基于反射自适应注册FaaS形参类型
Golang框架实战-KisFlow流式计算框架(12)-基于反射自适应注册FaaS形参类型

案例：
KisFlow-Golang流式计算案例(一)快速开始QuickStart
KisFlow-Golang流式计算案例(二)-Flow并流操作
KisFlow-Golang流式计算案例(二)-KisFlow在多协程中的应用