An errors package that will help you handle them gracefully. It allows you to add additional data to your errors, to wrap it and you even get a stack trace. Inspired by the github.com/pkg/errors package and Node.js' verror module.
- Add additional data to error values preventing long and hard to read error messages
- Wrap existing error values into new ones
- Stack traces for each error value
- MultiError, wrap multiple errors values into a single one; great for concurrent workflows that may generate multiple errors
- Pretty print of the whole error value and support JSON marshalling to ease the serialization (check the "Quick demo" section)
go get -u github.com/zignd/errorsFor a better understanding of the features provided by the package check the documentation at: godoc.org/github.com/zignd/errors
There's an example at examples/example1/example1.go that shows how to use the package.
Here's the code for the example:
package main
import (
"encoding/json"
"fmt"
"github.com/zignd/errors"
)
func createTransaction(id string) error {
bank := "bank_123456"
if err := updateDatabase(); err != nil {
return errors.Wrapdf(err, errors.Data{
"transactionId": id,
"userId": "67890",
}, "failed to complete the transaction on %s", bank)
}
return nil
}
func updateDatabase() error {
if err := createConnection(); err != nil {
return errors.Wrapd(err, errors.Data{
"tableName": "transactions",
"operation": "update",
}, "failed to update the database")
}
return nil
}
func createConnection() error {
if err := open(); err != nil {
return errors.Wrapd(err, errors.Data{
"server": "db-server-01",
"timeoutSeconds": 30,
}, "connection timeout")
}
return nil
}
func open() error {
return errors.Errord(errors.Data{
"network": "internal",
"severity": "high",
}, "network instability detected")
}
func main() {
if err := createTransaction("tx_123456"); err != nil {
b, _ := json.MarshalIndent(err, "", " ")
fmt.Println("Error logged as a JSON structure using the json.MarshalIndent:")
fmt.Printf("%s\n", b)
b, _ = json.Marshal(err)
fmt.Println("\nError logged as a JSON structure using the json.Marshal:")
fmt.Printf("%s\n", b)
fmt.Println("\nError logged using the s format specifier:")
fmt.Printf("%s\n", err)
fmt.Println("\nError logged using the +v format specifier:")
fmt.Printf("%+v\n", err)
}
}Here's the execution of the example:
$ go run examples/example1/example1.go
Error logged as a JSON structure using the json.MarshalIndent:
[
{
"data": {
"transactionId": "tx_123456",
"userId": "67890"
},
"message": "failed to complete the transaction on bank_123456",
"stack": [
"main.createTransaction @ /root/hack/errors/examples/example1/example1.go:13",
"main.main @ /root/hack/errors/examples/example1/example1.go:52",
"runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194",
"runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"
]
},
{
"data": {
"operation": "update",
"tableName": "transactions"
},
"message": "failed to update the database",
"stack": [
"main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:24",
"main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12",
"main.main @ /root/hack/errors/examples/example1/example1.go:52",
"runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194",
"runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"
]
},
{
"data": {
"server": "db-server-01",
"timeoutSeconds": 30
},
"message": "connection timeout",
"stack": [
"main.createConnection @ /root/hack/errors/examples/example1/example1.go:35",
"main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:23",
"main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12",
"main.main @ /root/hack/errors/examples/example1/example1.go:52",
"runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194",
"runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"
]
},
{
"data": {
"network": "internal",
"severity": "high"
},
"message": "network instability detected",
"stack": [
"main.open @ /root/hack/errors/examples/example1/example1.go:45",
"main.createConnection @ /root/hack/errors/examples/example1/example1.go:34",
"main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:23",
"main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12",
"main.main @ /root/hack/errors/examples/example1/example1.go:52",
"runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194",
"runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"
]
}
]
Error logged as a JSON structure using the json.Marshal:
[{"data":{"transactionId":"tx_123456","userId":"67890"},"message":"failed to complete the transaction on bank_123456","stack":["main.createTransaction @ /root/hack/errors/examples/example1/example1.go:13","main.main @ /root/hack/errors/examples/example1/example1.go:52","runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194","runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"]},{"data":{"operation":"update","tableName":"transactions"},"message":"failed to update the database","stack":["main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:24","main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12","main.main @ /root/hack/errors/examples/example1/example1.go:52","runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194","runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"]},{"data":{"server":"db-server-01","timeoutSeconds":30},"message":"connection timeout","stack":["main.createConnection @ /root/hack/errors/examples/example1/example1.go:35","main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:23","main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12","main.main @ /root/hack/errors/examples/example1/example1.go:52","runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194","runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"]},{"data":{"network":"internal","severity":"high"},"message":"network instability detected","stack":["main.open @ /root/hack/errors/examples/example1/example1.go:45","main.createConnection @ /root/hack/errors/examples/example1/example1.go:34","main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:23","main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12","main.main @ /root/hack/errors/examples/example1/example1.go:52","runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194","runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651"]}]
Error logged using the s format specifier:
failed to complete the transaction on bank_123456: failed to update the database: connection timeout: network instability detected
Error logged using the +v format specifier:
message:
"failed to complete the transaction on bank_123456"
data:
userId: 67890
transactionId: tx_123456
stack:
main.createTransaction @ /root/hack/errors/examples/example1/example1.go:13
main.main @ /root/hack/errors/examples/example1/example1.go:52
runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194
runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651
cause:
message:
"failed to update the database"
data:
tableName: transactions
operation: update
stack:
main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:24
main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12
main.main @ /root/hack/errors/examples/example1/example1.go:52
runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194
runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651
cause:
message:
"connection timeout"
data:
server: db-server-01
timeoutSeconds: 30
stack:
main.createConnection @ /root/hack/errors/examples/example1/example1.go:35
main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:23
main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12
main.main @ /root/hack/errors/examples/example1/example1.go:52
runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194
runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651
cause:
message:
"network instability detected"
data:
severity: high
network: internal
stack:
main.open @ /root/hack/errors/examples/example1/example1.go:45
main.createConnection @ /root/hack/errors/examples/example1/example1.go:34
main.updateDatabase @ /root/hack/errors/examples/example1/example1.go:23
main.createTransaction @ /root/hack/errors/examples/example1/example1.go:12
main.main @ /root/hack/errors/examples/example1/example1.go:52
runtime/internal/atomic.(*Uint32).Load @ /root/go/version/go1.21.0/src/runtime/internal/atomic/types.go:194
runtime.goexit @ /root/go/version/go1.21.0/src/runtime/asm_amd64.s:1651