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注意

由于Go是不支持热编译特性的,每一次代码变更后都要重新手动停止、编译、运行代码文件。run命令也不是实现热编译功能,而是提供了自动编译功能,当开发者修改了项目中的go文件时,该命令将会自动编译当前程序,并停止原有程序,运行新版的程序。

run命令会递归监控当前运行目录的所有go文件变化来实现自动编译。

查看命令使用帮助

$ gf run -h
USAGE
    gf run FILE [OPTION]

ARGUMENT
    FILE    building file path.
    OPTION  the same options as "go run"/"go build" except some options as follows defined

OPTION
    -/--args     custom process arguments.
    -/--swagger  auto parse and pack swagger into packed/data-swagger.go before running.

EXAMPLES
    gf run main.go
    gf run main.go --swagger
    gf run main.go --args "server -p 8080"
    gf run main.go -mod=vendor

DESCRIPTION
    The "run" command is used for running go codes with hot-compiled-like feature,
    which compiles and runs the go codes asynchronously when codes change.

使用示例

一般gf run main.go即可

$ gf run main.go --swagger
2020-12-31 00:40:16.948 build: main.go
2020-12-31 00:40:16.994 producing swagger files...
2020-12-31 00:40:17.145 done!
2020-12-31 00:40:17.216 gf pack swagger packed/swagger.go -n packed -y
2020-12-31 00:40:17.279 done!
2020-12-31 00:40:17.282 go build -o bin/main  main.go
2020-12-31 00:40:18.696 go file changes: "/Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf-demos/packed/swagger.go": WRITE
2020-12-31 00:40:18.696 build: main.go
2020-12-31 00:40:18.775 producing swagger files...
2020-12-31 00:40:18.911 done!
2020-12-31 00:40:19.045 gf pack swagger packed/swagger.go -n packed -y
2020-12-31 00:40:19.136 done!
2020-12-31 00:40:19.144 go build -o bin/main  main.go
2020-12-31 00:40:21.367 bin/main 
2020-12-31 00:40:21.372 build running pid: 40954
2020-12-31 00:40:21.437 [DEBU] [ghttp] SetServerRoot path: /Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf-demos/public
2020-12-31 00:40:21.440 40954: http server started listening on [:8199]
...


常见问题

too many open files on macOS

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2 Comments

  1. $ gf run main.go
    2021-02-25 02:08:08.660 build: main.go
    2021-02-25 02:08:08.677 go build -o bin\main.exe  main.go
    2021-02-25 02:08:08.770 build error:
    ERROR: 2021/02/25 02:08:08 [profiling] error parsing flags: when -address isn't specified, you must include -stream-stats-catapult-json
    exit status 1

    windows10 运行提示这个,我看了看文档也没发现这种如何解决。参数中也没-address这个,  -stream-stats-catapult-json 请问下这个参数是什么意思。

  2. 我google了一下,发现这个错误是定义在grpc-go里的。看起来是只有在特定的输入参数值下才会触发,我也不知道你是怎么启动的,你可以参照一下下面的代码

    /*
     *
     * Copyright 2019 gRPC authors.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     *
     */
    
    package main
    
    import (
    	"flag"
    	"fmt"
    )
    
    var flagAddress = flag.String("address", "", "address of a remote gRPC server with profiling turned on to retrieve stats from")
    var flagTimeout = flag.Int("timeout", 0, "network operations timeout in seconds to remote target (0 indicates unlimited)")
    
    var flagRetrieveSnapshot = flag.Bool("retrieve-snapshot", false, "connect to remote target and retrieve a profiling snapshot locally for processing")
    var flagSnapshot = flag.String("snapshot", "", "snapshot file to write to when retrieving profiling data or snapshot file to read from when processing profiling data")
    
    var flagEnableProfiling = flag.Bool("enable-profiling", false, "enable profiling in remote target")
    var flagDisableProfiling = flag.Bool("disable-profiling", false, "disable profiling in remote target")
    
    var flagStreamStatsCatapultJSON = flag.String("stream-stats-catapult-json", "", "path to a file to write to after transforming a snapshot into catapult's JSON format")
    var flagStreamStatsFilter = flag.String("stream-stats-filter", "server,client", "comma-separated list of stat tags to filter for")
    
    func exactlyOneOf(opts ...bool) bool {
    	first := true
    	for _, o := range opts {
    		if !o {
    			continue
    		}
    
    		if first {
    			first = false
    		} else {
    			return false
    		}
    	}
    
    	return !first
    }
    
    func parseArgs() error {
    	flag.Parse()
    
    	if *flagAddress != "" {
    		if !exactlyOneOf(*flagEnableProfiling, *flagDisableProfiling, *flagRetrieveSnapshot) {
    			return fmt.Errorf("when -address is specified, you must include exactly only one of -enable-profiling, -disable-profiling, and -retrieve-snapshot")
    		}
    
    		if *flagStreamStatsCatapultJSON != "" {
    			return fmt.Errorf("when -address is specified, you must not include -stream-stats-catapult-json")
    		}
    	} else {
    		if *flagEnableProfiling || *flagDisableProfiling || *flagRetrieveSnapshot {
    			return fmt.Errorf("when -address isn't specified, you must not include any of -enable-profiling, -disable-profiling, and -retrieve-snapshot")
    		}
    
    		if *flagStreamStatsCatapultJSON == "" {
    			return fmt.Errorf("when -address isn't specified, you must include -stream-stats-catapult-json")
    		}
    	}
    
    	return nil
    }