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crud.go
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crud.go
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package client
import (
"context"
"fmt"
"net/http"
"strconv"
"github.com/go-resty/resty/v2"
"github.com/google/go-querystring/query"
"golang.org/x/sync/errgroup"
)
type listResult[T any] struct {
// Total item count.
Count int64 `json:"count"`
// URL for next page (if any).
Next string `json:"next"`
// URL for previous page (if any).
Previous string `json:"previous"`
Items []T `json:"results"`
}
type crudOptions struct {
newRequest func(context.Context) *resty.Request
base string
getID func(any) int64
setPage func(any, *PageToken)
}
func crudList[T, O any](ctx context.Context, opts crudOptions, listOpts O) ([]T, *Response, error) {
req := opts.newRequest(ctx).SetResult(new(listResult[T]))
var pageNumber int
if values, err := query.Values(listOpts); err != nil {
return nil, nil, err
} else {
req.SetQueryParamsFromValues(values)
// listOpts has a property with the page number. Getting its value
// directly would require reflection.
if page := values.Get("page"); page != "" {
if pageNumber, err = strconv.Atoi(page); err != nil {
return nil, nil, err
}
}
}
resp, err := req.Get(opts.base)
// Items modified or deleted during iteration can cause a received page
// number to become unavailable. Treat the situation as an empty result
// set.
if err == nil && resp.StatusCode() == http.StatusNotFound && pageNumber > 1 {
return nil, wrapResponse(resp), nil
}
if err := convertError(err, resp); err != nil {
return nil, wrapResponse(resp), err
}
results := resp.Result().(*listResult[T])
w := wrapResponse(resp)
if w.NextPage, err = pageTokenFromURL(results.Next); err != nil {
return nil, nil, err
}
if w.PrevPage, err = pageTokenFromURL(results.Previous); err != nil {
return nil, nil, err
}
return results.Items, w, nil
}
func crudListAll[T, O any](ctx context.Context, opts crudOptions, listOpts O, handler func(context.Context, T) error) error {
queue := make(chan []T, 2)
g, ctx := errgroup.WithContext(ctx)
g.Go(func() error {
defer close(queue)
for {
items, resp, err := crudList[T](ctx, opts, listOpts)
if err != nil {
return err
}
select {
case queue <- items:
case <-ctx.Done():
return ctx.Err()
}
if resp == nil || resp.NextPage == nil {
break
}
opts.setPage(&listOpts, resp.NextPage)
}
return nil
})
g.Go(func() error {
seen := map[int64]struct{}{}
for items := range queue {
for _, i := range items {
key := opts.getID(i)
if _, ok := seen[key]; ok {
// Duplicates may be returned when items are added,
// modified or deleted during iteration.
continue
}
seen[key] = struct{}{}
if err := handler(ctx, i); err != nil {
return err
}
}
}
return nil
})
return g.Wait()
}
func crudGet[T any](ctx context.Context, opts crudOptions, id int64) (*T, *Response, error) {
resp, err := opts.newRequest(ctx).
SetResult(new(T)).
Get(fmt.Sprintf("%s%d/", opts.base, id))
if err := convertError(err, resp); err != nil {
return nil, wrapResponse(resp), err
}
return resp.Result().(*T), wrapResponse(resp), nil
}
func crudCreate[T any](ctx context.Context, opts crudOptions, data any) (*T, *Response, error) {
resp, err := opts.newRequest(ctx).
SetResult(new(T)).
SetBody(data).
Post(opts.base)
err = convertError(err, resp)
if detail, ok := err.(*RequestError); ok && detail.StatusCode == http.StatusCreated {
return resp.Result().(*T), wrapResponse(resp), nil
}
if err == nil {
err = &RequestError{
StatusCode: resp.StatusCode(),
Message: fmt.Sprintf("unexpected status %s", resp.Status()),
}
}
return nil, wrapResponse(resp), err
}
func crudUpdate[T any](ctx context.Context, opts crudOptions, id int64, data *T) (*T, *Response, error) {
resp, err := opts.newRequest(ctx).
SetResult(new(T)).
SetBody(*data).
Put(fmt.Sprintf("%s%d/", opts.base, id))
if err := convertError(err, resp); err != nil {
return nil, wrapResponse(resp), err
}
return resp.Result().(*T), wrapResponse(resp), nil
}
func crudPatch[T any](ctx context.Context, opts crudOptions, id int64, data any) (*T, *Response, error) {
resp, err := opts.newRequest(ctx).
SetResult(new(T)).
SetBody(data).
Patch(fmt.Sprintf("%s%d/", opts.base, id))
if err := convertError(err, resp); err != nil {
return nil, wrapResponse(resp), err
}
return resp.Result().(*T), wrapResponse(resp), nil
}
func crudDelete[T any](ctx context.Context, opts crudOptions, id int64) (*Response, error) {
resp, err := opts.newRequest(ctx).
Delete(fmt.Sprintf("%s%d/", opts.base, id))
return wrapResponse(resp), convertError(err, resp)
}