package worker
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"net/url"
"github.com/google/uuid"
"github.com/osbuild/osbuild-composer/internal/common"
"github.com/osbuild/osbuild-composer/internal/worker/api"
)
type Client struct {
server *url.URL
requester *http.Client
}
type Job interface {
Id() uuid.UUID
Type() string
Args(args interface{}) error
DynamicArgs(i int, args interface{}) error
NDynamicArgs() int
Update(result interface{}) error
Canceled() (bool, error)
UploadArtifact(name string, reader io.Reader) error
}
type job struct {
requester *http.Client
id uuid.UUID
location string
artifactLocation string
jobType string
args json.RawMessage
dynamicArgs []json.RawMessage
}
func NewClient(baseURL string, conf *tls.Config) (*Client, error) {
server, err := url.Parse(baseURL)
if err != nil {
return nil, err
}
server, err = server.Parse(api.BasePath + "/")
if err != nil {
panic(err)
}
requester := &http.Client{
Transport: &http.Transport{
TLSClientConfig: conf,
},
}
return &Client{server, requester}, nil
}
func NewClientUnix(path string) *Client {
server, err := url.Parse("http://localhost/")
if err != nil {
panic(err)
}
server, err = server.Parse(api.BasePath + "/")
if err != nil {
panic(err)
}
requester := &http.Client{
Transport: &http.Transport{
DialContext: func(context context.Context, network, addr string) (net.Conn, error) {
return net.Dial("unix", path)
},
},
}
return &Client{server, requester}
}
func (c *Client) RequestJob(types []string) (Job, error) {
url, err := c.server.Parse("jobs")
if err != nil {
// This only happens when "jobs" cannot be parsed.
panic(err)
}
var buf bytes.Buffer
err = json.NewEncoder(&buf).Encode(api.RequestJobJSONRequestBody{
Types: types,
Arch: common.CurrentArch(),
})
if err != nil {
panic(err)
}
response, err := c.requester.Post(url.String(), "application/json", &buf)
if err != nil {
return nil, fmt.Errorf("error requesting job: %v", err)
}
defer response.Body.Close()
if response.StatusCode != http.StatusCreated {
return nil, errorFromResponse(response, "error requesting job")
}
var jr requestJobResponse
err = json.NewDecoder(response.Body).Decode(&jr)
if err != nil {
return nil, fmt.Errorf("error parsing response: %v", err)
}
location, err := c.server.Parse(jr.Location)
if err != nil {
return nil, fmt.Errorf("error parsing location url in response: %v", err)
}
artifactLocation, err := c.server.Parse(jr.ArtifactLocation)
if err != nil {
return nil, fmt.Errorf("error parsing artifact location url in response: %v", err)
}
return &job{
requester: c.requester,
id: jr.Id,
jobType: jr.Type,
args: jr.Args,
dynamicArgs: jr.DynamicArgs,
location: location.String(),
artifactLocation: artifactLocation.String(),
}, nil
}
func (j *job) Id() uuid.UUID {
return j.id
}
func (j *job) Type() string {
return j.jobType
}
func (j *job) Args(args interface{}) error {
err := json.Unmarshal(j.args, args)
if err != nil {
return fmt.Errorf("error parsing job arguments: %v", err)
}
return nil
}
func (j *job) NDynamicArgs() int {
return len(j.dynamicArgs)
}
func (j *job) DynamicArgs(i int, args interface{}) error {
err := json.Unmarshal(j.dynamicArgs[i], args)
if err != nil {
return fmt.Errorf("error parsing job arguments: %v", err)
}
return nil
}
func (j *job) Update(result interface{}) error {
var buf bytes.Buffer
err := json.NewEncoder(&buf).Encode(api.UpdateJobJSONRequestBody{
Result: result,
})
if err != nil {
panic(err)
}
req, err := http.NewRequest("PATCH", j.location, &buf)
if err != nil {
panic(err)
}
req.Header.Add("Content-Type", "application/json")
response, err := j.requester.Do(req)
if err != nil {
return fmt.Errorf("error fetching job info: %v", err)
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return errorFromResponse(response, "error setting job status")
}
return nil
}
func (j *job) Canceled() (bool, error) {
response, err := j.requester.Get(j.location)
if err != nil {
return false, fmt.Errorf("error fetching job info: %v", err)
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return false, errorFromResponse(response, "error fetching job info")
}
var jr getJobResponse
err = json.NewDecoder(response.Body).Decode(&jr)
if err != nil {
return false, fmt.Errorf("error parsing reponse: %v", err)
}
return jr.Canceled, nil
}
func (j *job) UploadArtifact(name string, reader io.Reader) error {
if j.artifactLocation == "" {
return fmt.Errorf("server does not accept artifacts for this job")
}
loc, err := url.Parse(j.artifactLocation)
if err != nil {
return fmt.Errorf("error parsing job location: %v", err)
}
loc, err = loc.Parse(url.PathEscape(name))
if err != nil {
panic(err)
}
req, err := http.NewRequest("PUT", loc.String(), reader)
if err != nil {
return fmt.Errorf("cannot create request: %v", err)
}
req.Header.Add("Content-Type", "application/octet-stream")
response, err := j.requester.Do(req)
if err != nil {
return fmt.Errorf("error uploading artifact: %v", err)
}
if response.StatusCode != 200 {
return errorFromResponse(response, "error uploading artifact")
}
return nil
}
// Parses an api.Error from a response and returns it as a golang error. Other
// errors, such failing to parse the response, are returned as golang error as
// well. If client code expects an error, it gets one.
func errorFromResponse(response *http.Response, message string) error {
var e api.Error
err := json.NewDecoder(response.Body).Decode(&e)
if err != nil {
return fmt.Errorf("failed to parse error response: %v", err)
}
return fmt.Errorf("%v: %v — %v", message, response.StatusCode, e.Message)
}