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knotserver: add generic git repo walker interface #269

merged
opened by
oppi.li 5 months ago targeting master from push-zvkrywwskknq
Signed-off-by: oppiliappan me@oppi.li
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unified split
Changed files
+79
knotserver
git
tree.go
+79
knotserver/git/tree.go
···

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       import (

     

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       	"context"

     

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       	"errors"

     

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       	"fmt"

     

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       	"path"

     

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       	"time"

     
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       	return nts

     

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       }

     

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       var (

     

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       	TerminateWalk error = errors.New("terminate walk")

     

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       )

     

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       type callback = func(node object.TreeEntry, parent *object.Tree, fullPath string) error

     

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       func (g *GitRepo) Walk(

     

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       	ctx context.Context,

     

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       	root string,

     

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       	cb callback,

     

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       ) error {

     

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       	c, err := g.r.CommitObject(g.h)

     

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       	if err != nil {

     

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       		return fmt.Errorf("commit object: %w", err)

     

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       	}

     

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       	tree, err := c.Tree()

     

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       	if err != nil {

     

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       		return fmt.Errorf("file tree: %w", err)

     

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       	}

     

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       	subtree := tree

     

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       	if root != "" {

     

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       		subtree, err = tree.Tree(root)

     

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       		if err != nil {

     

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       			return fmt.Errorf("sub tree: %w", err)

     

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       		}

     

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       	}

     

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       	return g.walkHelper(ctx, root, subtree, cb)

     

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       }

     

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       func (g *GitRepo) walkHelper(

     

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       	ctx context.Context,

     

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       	root string,

     

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       	currentTree *object.Tree,

     

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       	cb callback,

     

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       ) error {

     

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       	for _, e := range currentTree.Entries {

     

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       		// check if context hits deadline before processing

     

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       		select {

     

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       		case <-ctx.Done():

     

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       			return ctx.Err()

     

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       		default:

     

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       		}

     

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       		mode, err := e.Mode.ToOSFileMode()

     

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       		if err != nil {

     

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       			// TODO: log this

     

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       			continue

     

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       		}

     

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       		if e.Mode.IsFile() {

     

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       			err = cb(e, currentTree, root)

     

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       			if errors.Is(err, TerminateWalk) {

     

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       				return err

     

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       			}

     

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       		}

     

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       		// e is a directory

     

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       		if mode.IsDir() {

     

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       			subtree, err := currentTree.Tree(e.Name)

     

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       			if err != nil {

     

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       				return fmt.Errorf("sub tree %s: %w", e.Name, err)

     

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       			}

     

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       			fullPath := path.Join(root, e.Name)

     

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       			err = g.walkHelper(ctx, fullPath, subtree, cb)

     

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       			if err != nil {

     

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       				return err

     

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       			}

     

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       		}

     

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       	}

     

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       	return nil

     

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       }