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client_implementation.go
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/
client_implementation.go
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package gitlab
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"strconv"
"strings"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"github.com/sirkon/gitlab/gitlabdata"
)
// NewAPIAccess creates an access point to gitlab API instance
// httpClient can be nil, http.DefaultClient will be used if it is
// url must be a full path to gitlab API, e.g. https://gitlab.com/api/v4, etc
func NewAPIAccess(httpClient *http.Client, url string) APIAccess {
if httpClient == nil {
httpClient = http.DefaultClient
}
return &apiAccess{
client: httpClient,
url: url,
}
}
type apiAccess struct {
client *http.Client
url string
}
func (a *apiAccess) Client(token string) Client {
return apiClient{
token: token,
access: a,
}
}
func (a *apiAccess) makeRequest(ctx context.Context, project, token string, keys map[string]string) (*http.Response, error) {
req, err := http.NewRequest(http.MethodGet, a.url+project, nil)
if err != nil {
return nil, fmt.Errorf("failed to create req to gitlab API: %s", err)
}
q := req.URL.Query()
for key, value := range keys {
q.Set(key, value)
}
req.URL.RawQuery = q.Encode()
req.Header.Set("PRIVATE-TOKEN", token)
req = req.WithContext(ctx)
zerolog.Ctx(ctx).Debug().Str("gitlab-url", req.URL.RawPath).Msg("gitlab remote request")
resp, err := a.client.Do(req)
if err != nil {
return nil, fmt.Errorf("failed to get a response: %s", err)
}
if resp.StatusCode != http.StatusOK {
defer closeBody(ctx, resp)
res, err := ioutil.ReadAll(resp.Body)
if err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to read out response content")
return nil, err
}
zerolog.Ctx(ctx).Error().Int("error-code", resp.StatusCode).Str("error-response", string(res)).Msg("gitlab error")
if resp.StatusCode == http.StatusNotFound {
return nil, os.ErrNotExist
}
if len(res) == 0 {
return nil, errors.New("gitlab error")
}
return nil, errors.Errorf("gitlab error: %s", string(res))
}
return resp, nil
}
type apiClient struct {
token string
access *apiAccess
}
func closeBody(ctx context.Context, resp *http.Response) {
if err := resp.Body.Close(); err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to close response body")
}
}
func (c apiClient) projectURL(project string, items ...string) string {
urlItems := make([]string, len(items)+3)
urlItems[0] = ""
urlItems[1] = "projects"
urlItems[2] = url.PathEscape(project)
copy(urlItems[3:], items)
return strings.Join(urlItems, "/")
}
func (c apiClient) Tags(ctx context.Context, project, tagPrefix string) ([]*gitlabdata.Tag, error) {
var urlPath string
if len(tagPrefix) > 0 {
urlPath = c.projectURL(project, "repository", "tags", tagPrefix)
} else {
urlPath = c.projectURL(project, "repository", "tags")
}
logger := zerolog.Ctx(ctx).With().Str("gitlab-request", "tags").Str("project", project).Str("tag-prefix", tagPrefix).Logger()
ctx = (&logger).WithContext(ctx)
resp, err := c.access.makeRequest(ctx, urlPath, c.token, nil)
if err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to get requested tags")
return nil, err
}
defer closeBody(ctx, resp)
var dest []*gitlabdata.Tag
unmarshaler := json.NewDecoder(resp.Body)
if len(tagPrefix) > 0 {
var tag gitlabdata.Tag
if err := unmarshaler.Decode(&tag); err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to unmarshal a response")
return nil, err
}
dest = append(dest, &tag)
} else {
if err := unmarshaler.Decode(&dest); err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to unmarshal a response")
return nil, err
}
}
return dest, nil
}
func (c apiClient) File(ctx context.Context, project, path, ref string) ([]byte, error) {
urlPath := c.projectURL(project, "repository", "files", url.PathEscape(path))
logger := zerolog.Ctx(ctx).With().Str("gitlab-request", "file").Str("project", project).Str("file", path).Logger()
ctx = (&logger).WithContext(ctx)
resp, err := c.access.makeRequest(ctx, urlPath, c.token, map[string]string{"ref": ref})
if err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to get a file")
return nil, err
}
defer closeBody(ctx, resp)
type responseType struct {
Encoding string `json:"encoding"`
Content string `json:"content"`
ContentSHA256 string `json:"content_sha256"`
}
dec := json.NewDecoder(resp.Body)
var dest responseType
if err := dec.Decode(&dest); err != nil {
return nil, err
}
var content []byte
switch dest.Encoding {
case "base64":
content, err = base64.StdEncoding.DecodeString(dest.Content)
if err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to decode file content")
return nil, err
}
default:
zerolog.Ctx(ctx).Error().Msgf("encoding %s is not supported", dest.Encoding)
return nil, fmt.Errorf("encoding %s is not supported", dest.Encoding)
}
return content, nil
}
func (c apiClient) ProjectInfo(ctx context.Context, project string) (*gitlabdata.Project, error) {
urlPath := c.projectURL(project)
logger := zerolog.Ctx(ctx).With().Str("gitlab-request", "project-info").Str("project", project).Logger()
ctx = (&logger).WithContext(ctx)
resp, err := c.access.makeRequest(ctx, urlPath, c.token, nil)
if err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to get project info")
return nil, err
}
defer closeBody(ctx, resp)
var dest gitlabdata.Project
unmarshaler := json.NewDecoder(resp.Body)
if err := unmarshaler.Decode(&dest); err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to unmarshal a response")
return nil, err
}
return &dest, nil
}
func (c apiClient) Archive(ctx context.Context, projectID int, tag string) (io.ReadCloser, error) {
urlPath := c.projectURL(strconv.Itoa(projectID), "repository", "archive.zip")
logger := zerolog.Ctx(ctx).With().Str("gitlab-request", "archive").Int("project-id", projectID).Str("tag", tag).Logger()
ctx = (&logger).WithContext(ctx)
resp, err := c.access.makeRequest(ctx, urlPath, c.token, map[string]string{"sha": tag})
if err != nil {
zerolog.Ctx(ctx).Error().Err(err).Msg("failed to get an archive")
return nil, err
}
return resp.Body, nil
}
type referenceItem struct {
Type string `json:"type"`
Name string `json:"name"`
}
func (c apiClient) Commits(ctx context.Context, project string, ref string) ([]*gitlabdata.Commit, error) {
urlPath := c.projectURL(project, "repository", "commits")
logger := zerolog.Ctx(ctx).With().Str("gitlab-request", "commits").Str("project", project).Logger()
ctx = (&logger).WithContext(ctx)
var dest []*gitlabdata.Commit
resp, err := c.access.makeRequest(ctx, urlPath, c.token, map[string]string{"ref_name": ref, "per_page": "20000"})
if err == nil {
defer closeBody(ctx, resp)
unmarshaler := json.NewDecoder(resp.Body)
if err := unmarshaler.Decode(&dest); err != nil {
logger.Error().Err(err).Msg("failed to unmarshal commits response")
return nil, err
}
return dest, nil
}
logger.Warn().Err(err).Msg("failed to get an archive via branch or tag name, trying to get it via commit SHA")
referenceURLPath := c.projectURL(project, "repository", "commits", ref, "refs")
resp, err = c.access.makeRequest(ctx, referenceURLPath, c.token, nil)
if err != nil {
logger.Error().Err(err).Msgf("failed to get references for a given commit `%s`", ref)
return nil, err
}
defer closeBody(ctx, resp)
var references []referenceItem
unmarshaler := json.NewDecoder(resp.Body)
if err := unmarshaler.Decode(&references); err != nil {
logger.Error().Err(err).Msg("failed to unmarshal commit references response")
return nil, err
}
// got commit references, trying them out
for _, repoRef := range references {
dest, err = c.Commits(ctx, project, repoRef.Name)
if err != nil {
logger.Error().Err(err).Msgf("failed to retrieve commits of %s %s", repoRef.Type, repoRef.Name)
continue
}
// got commits, filter every commit happened after the given one and return the result
for i, commit := range dest {
if commit.ShortID == ref || commit.ID == ref {
return dest[i:], nil
}
}
}
return nil, fmt.Errorf("failed to get commit history of given branch/tag/commit")
}