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Jim Clark
2022-12-04 12:19:08 -08:00
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/parser
/.clj-kondo/
/.cpcache/
/.lsp/

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# Contributing
Make an [issue](https://github.com/atomisthq/pod-babashka-docker/issues) and/or [PR](https://github.com/atomisthq/pod-babashka-docker/pulls).

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## Background
This is a [babashka pod](https://github.com/babashka/pods) that binds some golang functions into a clojure namespace. Using this pod, clojure programs can parse dockerfiles and docker images names using the "official" docker golang libraries.
* [`github.com/docker/distribution/reference`](https://github.com/distribution/distribution/blob/main/reference/reference.go) (for image name parsing)
* [`github.com/moby/buildkit/frontend/dockerfile/parser`](https://github.com/moby/buildkit/blob/master/frontend/dockerfile/parser/parser.go) (for generating a Dockerfile AST).
## Usage
```clojure
(require '[babashka.pods :as pods])
(pods/load-pod 'atomisthq/docker "0.1.0")
; OR use a locally built pod binary
#_(pods/load-pod "./parser")
;; load-pod will create this namespace with two vars
(require '[pod.babashka.docker :as docker])
;; parse image names using github.com/docker/distribution
;; turns golang structs into clojure maps
(docker/parse-image-name "gcr.io/whatever:tag")
;; automatically turns golang errors into Exceptions
(try
(docker/parse-image-name "gcr.io/whatever/:tag")
(catch Exception e
;; invalid reference format
(println (.getMessage e))))
;; parse dockerfiles using github.com/moby/buildkit
;; returns the Result struct transformed to a clojure map
(docker/parse-dockerfile "FROM \\\n gcr.io/whatever:tag\nCMD [\"run\"]")
```
## Building
To build the golang `parser` binary locally, run `go build`.
```bash
go build
```
## Contributing
You can find information about contributing to this project in the CONTRIBUTING.md

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package babashka
import (
"bufio"
"encoding/json"
"os"
"github.com/jackpal/bencode-go"
)
type Message struct {
Op string
Id string
Args string
Var string
}
type Namespace struct {
Name string "name"
Vars []Var "vars"
}
type Var struct {
Name string "name"
Code string `bencode:"code,omitempty"`
}
type DescribeResponse struct {
Format string "format"
Namespaces []Namespace "namespaces"
}
type InvokeResponse struct {
Id string "id"
Value string "value" // stringified json response
Status []string "status"
}
type ErrorResponse struct {
Id string "id"
Status []string "status"
ExMessage string "ex-message"
ExData string "ex-data"
}
func ReadMessage() (*Message, error) {
reader := bufio.NewReader(os.Stdin)
message := &Message{}
if err := bencode.Unmarshal(reader, &message); err != nil {
return nil, err
}
return message, nil
}
func WriteDescribeResponse(describeResponse *DescribeResponse) {
writeResponse(*describeResponse)
}
func WriteInvokeResponse(inputMessage *Message, value any) error {
if value == nil {
return nil
}
resultValue, err := json.Marshal(value)
if err != nil {
return err
}
response := InvokeResponse{Id: inputMessage.Id, Status: []string{"done"}, Value: string(resultValue)}
writeResponse(response)
return nil
}
func WriteErrorResponse(inputMessage *Message, err error) {
errorResponse := ErrorResponse{Id: inputMessage.Id, Status: []string{"done", "error"}, ExMessage: err.Error()}
writeResponse(errorResponse)
}
func writeResponse(response any) error {
writer := bufio.NewWriter(os.Stdout)
if err := bencode.Marshal(writer, response); err != nil {
return err
}
writer.Flush()
return nil
}

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{:sources ["dev"]
:deps {babashka/babashka.pods {:mvn/version "0.1.0"}
com.cognitect/transit-clj {:mvn/version "1.0.324"}}}

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(ns user
(:require [babashka.pods :as pods]))
(pods/load-pod 'atomisthq/docker "0.1.0")
(require '[pod.babashka.docker :as docker])
;; parse image names using github.com/docker/distribution
;; turns golang structs into clojure maps
(docker/parse-image-name "gcr.io/whatever:tag")
;; automatically turns golang errors into Exceptions
(try
(docker/parse-image-name "gcr.io/whatever/:tag")
(catch Exception e
;; invalid reference format
(println (.getMessage e))))
;; parse dockerfiles using github.com/moby/buildkit
;; returns the Result struct transformed to a clojure map
(docker/parse-dockerfile "FROM \\\n gcr.io/whatever:tag\nCMD [\"run\"]")

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package docker
import (
"github.com/docker/distribution/reference"
"github.com/moby/buildkit/frontend/dockerfile/parser"
//"reflect"
"crypto/sha256"
"crypto/sha512"
"encoding/json"
"fmt"
"strings"
"dockerfileparse/user/parser/babashka"
)
type Reference struct {
Path string `json:"path"`
Domain string `json:"domain,omitempty"`
Tag string `json:"tag,omitempty"`
Digest string `json:"digest,omitempty"`
}
type Error struct {
Error string `json:"error"`
}
func parse_uri(s string) (Reference, error) {
tag, domain, path, digest := "", "", "", ""
sha256.New()
sha512.New()
ref, err := reference.Parse(s)
if err != nil {
return Reference{},err;
}
//fmt.Printf("%s\n", reflect.TypeOf(ref));
if tagged, ok := ref.(reference.NamedTagged); ok {
tag = tagged.Tag()
}
if named, ok := ref.(reference.Named); ok {
domain = reference.Domain(named)
path = reference.Path(named)
}
if digested, ok := ref.(reference.Canonical); ok {
digest = digested.Digest().String()
}
//u, err := json.Marshal(Reference{Path: path, Domain: domain, Tag: tag, Digest: digest})
return Reference{Path: path, Domain: domain, Tag: tag, Digest: digest}, err;
}
func ProcessMessage(message *babashka.Message) (any, error) {
switch message.Op {
case "describe":
return &babashka.DescribeResponse{
Format: "json",
Namespaces: []babashka.Namespace{
{
Name: "pod.babashka.docker",
Vars: []babashka.Var{
{
Name: "parse-image-name",
},
{
Name: "parse-dockerfile",
},
},
},
},
}, nil
case "invoke":
switch message.Var {
case "pod.babashka.docker/parse-image-name":
args := []string{}
if err := json.Unmarshal([]byte(message.Args), &args); err != nil {
return nil, err
}
return parse_uri(args[0])
case "pod.babashka.docker/parse-dockerfile":
args := []string{}
if err := json.Unmarshal([]byte(message.Args), &args); err != nil {
return nil, err
}
reader := strings.NewReader(args[0])
return parser.Parse(reader)
default:
return nil, fmt.Errorf("Unknown var %s", message.Var)
}
default:
return nil, fmt.Errorf("Unknown op %s", message.Op)
}
}

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module dockerfileparse/user/parser
go 1.19
require (
github.com/docker/distribution v2.8.1+incompatible
github.com/jackpal/bencode-go v1.0.0
github.com/moby/buildkit v0.10.6
)
require (
github.com/containerd/typeurl v1.0.2 // indirect
github.com/gogo/protobuf v1.3.2 // indirect
github.com/golang/protobuf v1.5.2 // indirect
github.com/opencontainers/go-digest v1.0.0 // indirect
github.com/pkg/errors v0.9.1 // indirect
google.golang.org/protobuf v1.27.1 // indirect
)

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github.com/containerd/typeurl v1.0.2 h1:Chlt8zIieDbzQFzXzAeBEF92KhExuE4p9p92/QmY7aY=
github.com/containerd/typeurl v1.0.2/go.mod h1:9trJWW2sRlGub4wZJRTW83VtbOLS6hwcDZXTn6oPz9s=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/docker/distribution v2.8.1+incompatible h1:Q50tZOPR6T/hjNsyc9g8/syEs6bk8XXApsHjKukMl68=
github.com/docker/distribution v2.8.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
github.com/jackpal/bencode-go v1.0.0 h1:lzbSPPqqSfWQnqVNe/BBY1NXdDpncArxShL10+fmFus=
github.com/jackpal/bencode-go v1.0.0/go.mod h1:5FSBQ74yhCl5oQ+QxRPYzWMONFnxbL68/23eezsBI5c=
github.com/moby/buildkit v0.10.6 h1:DJlEuLIgnu34HQKF4n9Eg6q2YqQVC0eOpMb4p2eRS2w=
github.com/moby/buildkit v0.10.6/go.mod h1:tQuuyTWtOb9D+RE425cwOCUkX0/oZ+5iBZ+uWpWQ9bU=
github.com/novln/docker-parser v1.0.0 h1:PjEBd9QnKixcWczNGyEdfUrP6GR0YUilAqG7Wksg3uc=
github.com/novln/docker-parser v1.0.0/go.mod h1:oCeM32fsoUwkwByB5wVjsrsVQySzPWkl3JdlTn1txpE=
github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

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package main
import (
"dockerfileparse/user/parser/babashka"
"dockerfileparse/user/parser/docker"
)
func main() {
for {
message, err := babashka.ReadMessage()
if err != nil {
babashka.WriteErrorResponse(message, err)
continue
}
res, err := docker.ProcessMessage(message)
if err != nil {
babashka.WriteErrorResponse(message, err)
continue
}
describeres, ok := res.(*babashka.DescribeResponse)
if ok {
babashka.WriteDescribeResponse(describeres)
continue
}
babashka.WriteInvokeResponse(message, res)
}
}