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configurator.go
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/
configurator.go
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package git
import (
"context"
"errors"
"fmt"
"io"
"os"
"sync"
"github.com/alexfalkowski/go-service/meta"
serrors "github.com/alexfalkowski/konfig/source/configurator/errors"
"github.com/alexfalkowski/konfig/source/configurator/trace/opentracing"
"github.com/go-git/go-billy/v5"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/transport/http"
)
const buffSize = 8192
// Configurator for git.
type Configurator struct {
cfg *Config
repo *git.Repository
mux sync.Mutex
tracer opentracing.Tracer
}
// GetConfig for git.
func (c *Configurator) GetConfig(ctx context.Context, app, ver, env, cluster, cmd string) ([]byte, error) {
c.mux.Lock()
defer c.mux.Unlock()
if err := c.clone(ctx); err != nil {
meta.WithAttribute(ctx, "git.clone_error", err.Error())
return nil, serrors.ErrNotFound
}
if err := c.pull(ctx); err != nil {
meta.WithAttribute(ctx, "git.pull_error", err.Error())
return nil, serrors.ErrNotFound
}
file, err := c.file(ctx, app, ver, env, cluster, cmd)
if err != nil {
meta.WithAttribute(ctx, "git.file_error", err.Error())
return nil, serrors.ErrNotFound
}
return c.bytes(file), nil
}
func (c *Configurator) bytes(reader io.Reader) []byte {
data := make([]byte, 0)
buf := make([]byte, buffSize)
for {
n, err := reader.Read(buf)
if err == io.EOF {
break
}
data = append(data, buf[:n]...)
}
return data
}
func (c *Configurator) file(ctx context.Context, app, ver, env, cluster, cmd string) (billy.File, error) {
var path string
if cluster == "*" {
path = fmt.Sprintf("%s/%s/%s.config.yml", app, env, cmd)
} else {
path = fmt.Sprintf("%s/%s/%s/%s.config.yml", app, env, cluster, cmd)
}
_, span := opentracing.StartSpanFromContext(ctx, c.tracer, "git", fmt.Sprintf("get-file %s", path))
defer span.Finish()
tree, _ := c.repo.Worktree()
err := tree.Checkout(&git.CheckoutOptions{Branch: plumbing.NewTagReferenceName(fmt.Sprintf("%s/%s", app, ver))})
if err != nil {
return nil, err
}
file, err := tree.Filesystem.Open(path)
if err != nil {
return nil, err
}
return file, nil
}
func (c *Configurator) pull(ctx context.Context) error {
ctx, span := opentracing.StartSpanFromContext(ctx, c.tracer, "git", "pull master")
defer span.Finish()
tree, _ := c.repo.Worktree()
if err := tree.Checkout(&git.CheckoutOptions{Branch: plumbing.Master}); err != nil {
return err
}
if err := tree.PullContext(ctx, &git.PullOptions{RemoteName: "origin"}); err != nil && !errors.Is(err, git.NoErrAlreadyUpToDate) {
return err
}
return nil
}
func (c *Configurator) clone(ctx context.Context) error {
ctx, span := opentracing.StartSpanFromContext(ctx, c.tracer, "git", fmt.Sprintf("clone %s", c.cfg.URL))
defer span.Finish()
if c.repo != nil {
return nil
}
if err := os.RemoveAll(c.cfg.Dir); err != nil {
return err
}
opts := &git.CloneOptions{Auth: &http.BasicAuth{Username: "a", Password: c.cfg.Token}, URL: c.cfg.URL}
r, err := git.PlainCloneContext(ctx, c.cfg.Dir, false, opts)
if err != nil {
return err
}
c.repo = r
return nil
}