go cover不能生成可编译的打桩代码

[Leon Su]

执行goc cover生成打桩代码

执行命令：

goc cover

生成了cover.go和http_cover_apis_auto_generated.go

.
├── cover.go
├── go.mod
├── http_cover_apis_auto_generated.go
└── main.go

运行打好桩的代码报错

go run .
cover.go:1:9: expected 'IDENT', found '.'
http_cover_apis_auto_generated.go:24:2: .: cannot import current directory

生成的代码：
cover.go

package .



var GoCover_0_623462353261316139306530 = struct {
	Count     [29]uint32
	Pos       [3 * 29]uint32
	NumStmt   [29]uint16
} {
	Pos: [3 * 29]uint32{
		30, 48, 0x21000d, // [0]
		52, 65, 0xc0002, // [1]
		80, 82, 0x4f0002, // [2]
		86, 87, 0x220002, // [3]
		48, 50, 0x30021, // [4]
		65, 74, 0x2e000c, // [5]
		77, 77, 0xe0003, // [6]
		74, 76, 0x4002e, // [7]
		82, 84, 0x3004f, // [8]
		90, 91, 0x47001b, // [9]
		91, 92, 0x180047, // [10]
		96, 99, 0x230003, // [11]
		92, 95, 0x40018, // [12]
		103, 104, 0x47001d, // [13]
		104, 105, 0x260047, // [14]
		109, 109, 0x2f0003, // [15]
		105, 108, 0x40026, // [16]
		113, 114, 0x2e0042, // [17]
		114, 115, 0x48002e, // [18]
		115, 116, 0x110048, // [19]
		123, 123, 0x180004, // [20]
		116, 118, 0xc0011, // [21]
		121, 121, 0x510005, // [22]
		118, 120, 0x6000c, // [23]
		128, 129, 0x2e004b, // [24]
		129, 130, 0x48002e, // [25]
		130, 132, 0x170048, // [26]
		135, 137, 0x290004, // [27]
		132, 134, 0x50017, // [28]
	},
	NumStmt: [29]uint16{
		13, // 0
		5, // 1
		3, // 2
		2, // 3
		1, // 4
		7, // 5
		1, // 6
		1, // 7
		1, // 8
		1, // 9
		1, // 10
		4, // 11
		2, // 12
		1, // 13
		1, // 14
		1, // 15
		2, // 16
		1, // 17
		1, // 18
		1, // 19
		1, // 20
		2, // 21
		1, // 22
		1, // 23
		1, // 24
		1, // 25
		2, // 26
		3, // 27
		1, // 28
	},
}

http_cover_apis_auto_generated.go

// Code generated by goc system. DO NOT EDIT.

package main

import (
	"bufio"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	_log "log"
	"net"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"strings"
	"sync/atomic"
	"syscall"
	"testing"

	_cover "."

)

func init() {
	go registerHandlersGoc()
}

func loadValuesGoc() (map[string][]uint32, map[string][]testing.CoverBlock) {
	var (
		coverCounters = make(map[string][]uint32)
		coverBlocks   = make(map[string][]testing.CoverBlock)
	)

...

main.go

//line /Users/leonsulicun/LeonDisk/chopeGit/test/simple-go-server/main.go:1
package main; import . "."

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"sync/atomic"
	"time"
)

type key int

const (
	requestIDKey key = 0
)

var (
	Version      string = ""
	GitTag       string = ""
	GitCommit    string = ""
	GitTreeState string = ""
	listenAddr   string
	healthy      int32
)

func main() {GoCover_0_623462353261316139306530.Count[0]++;
	flag.StringVar(&listenAddr, "listen-addr", ":5001", "server listen address")
	flag.Parse()
...

go.mod

module simple-server

go 1.20

[Changjun Ji]

hi @LeonSu070 , The goc cover function was initially created as an internal tool to aid in testing during the early stages of development. However, it is now considered deprecated and should not be utilized.

For experiencing the desired feature, I recommend using the goc build command. This will provide a suitable alternative to meet your testing requirements.

[Leon Su]

Hi @CarlJi , Thanks for your response!

Actually, we are running our service on AWS Lambda. That means we use AWS sam build to build our service. That's why i need to run goc cover to generate the source code first, then run sam build to deploy our service to Lambda.

I changed the generated source code manually like the following steps, it can be built by sam build. If you can update goc cover to reduce the manual work that would be great.

1. move cover.go to a folder cover, and rename the package name from "." to "cover"
2. import "simple-server/cover" in main.go and http_cover_apis_auto_generated.go
3. change the counter var from GoCover_0_xxxxxxxxxxxxxxxxxxxx to cover.GoCover_0_xxxxxxxxxxxxxxxxxxxx in main.go

//line /Users/leonsulicun/LeonDisk/chopeGit/test/simple-go-server/main.go:1
package main; 

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"sync/atomic"
	"time"
	"simple-server/cover"
)

type key int

const (
	requestIDKey key = 0
)

var (
	Version      string = ""
	GitTag       string = ""
	GitCommit    string = ""
	GitTreeState string = ""
	listenAddr   string
	healthy      int32
)

func main() {cover.GoCover_0_623462353261316139306530.Count[0]++;
	flag.StringVar(&listenAddr, "listen-addr", ":5001", "server listen address")
	flag.Parse()

	logger := log.New(os.Stdout, "http: ", log.LstdFlags)

	logger.Println("Simple go server")
	logger.Println("Version:", Version)
	logger.Println("GitTag:", GitTag)
	logger.Println("GitCommit:", GitCommit)
	logger.Println("GitTreeState:", GitTreeState)

	logger.Println("Server is starting...")

	router := http.NewServeMux()
	router.Handle("/", index())
	router.Handle("/healthz", healthz())

	nextRequestID := func() string {cover.GoCover_0_623462353261316139306530.Count[4]++;
		return fmt.Sprintf("%d", time.Now().UnixNano())
	}

	cover.GoCover_0_623462353261316139306530.Count[1]++;server := &http.Server{
		Addr:         listenAddr,
		Handler:      tracing(nextRequestID)(logging(logger)(router)),
		ErrorLog:     logger,
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
		IdleTimeout:  15 * time.Second,
	}
...

[Changjun Ji]

@LeonSu070 Certainly, let's add it to the backlog. Thank you!

[Leon Su]

Thanks!