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package ingest
import (
"bufio"
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/Fuwn/plutia/internal/types"
)
type Client struct {
source string
http *http.Client
}
func NewClient(source string) *Client {
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{Timeout: 10 * time.Second, KeepAlive: 30 * time.Second}).DialContext,
ForceAttemptHTTP2: true,
MaxIdleConns: 256,
MaxIdleConnsPerHost: 64,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
return &Client{
source: strings.TrimRight(source, "/"),
http: &http.Client{
Timeout: 60 * time.Second,
Transport: transport,
},
}
}
func (c *Client) FetchExport(ctx context.Context, after uint64) ([]types.ExportRecord, error) {
return c.FetchExportLimited(ctx, after, 0)
}
func (c *Client) FetchExportLimited(ctx context.Context, after uint64, limit uint64) ([]types.ExportRecord, error) {
if strings.HasPrefix(c.source, "file://") || strings.HasSuffix(c.source, ".ndjson") || strings.HasSuffix(c.source, ".json") {
return c.fetchFromFile(after, limit)
}
u, err := url.Parse(c.source)
if err != nil {
return nil, fmt.Errorf("parse plc source: %w", err)
}
u.Path = strings.TrimRight(u.Path, "/") + "/export"
q := u.Query()
q.Set("after", fmt.Sprintf("%d", after))
u.RawQuery = q.Encode()
req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
if err != nil {
return nil, fmt.Errorf("new request: %w", err)
}
resp, err := c.http.Do(req)
if err != nil {
return nil, fmt.Errorf("fetch export: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
b, _ := io.ReadAll(io.LimitReader(resp.Body, 4*1024))
return nil, fmt.Errorf("export response %d: %s", resp.StatusCode, strings.TrimSpace(string(b)))
}
return decodeExportBody(resp.Body, limit)
}
func decodeExportBody(r io.Reader, limit uint64) ([]types.ExportRecord, error) {
br := bufio.NewReader(r)
first, err := peekFirstNonSpace(br)
if err != nil {
if err == io.EOF {
return nil, nil
}
return nil, err
}
if first == '[' {
b, err := io.ReadAll(br)
if err != nil {
return nil, fmt.Errorf("read export body: %w", err)
}
trimmed := bytes.TrimSpace(b)
var records []types.ExportRecord
if err := json.Unmarshal(trimmed, &records); err != nil {
return nil, fmt.Errorf("decode export json array: %w", err)
}
if limit > 0 && uint64(len(records)) > limit {
records = records[:limit]
}
return records, nil
}
out := make([]types.ExportRecord, 0, 1024)
for {
line, err := br.ReadBytes('\n')
isEOF := errors.Is(err, io.EOF)
if err != nil && !isEOF {
return nil, fmt.Errorf("read ndjson line: %w", err)
}
if limit > 0 && uint64(len(out)) >= limit {
return out, nil
}
trimmed := bytes.TrimSpace(line)
if len(trimmed) > 0 {
var rec types.ExportRecord
if err := json.Unmarshal(trimmed, &rec); err != nil {
if isEOF && isTrailingNDJSONPartial(err) {
return out, nil
}
return nil, fmt.Errorf("decode ndjson line: %w", err)
}
out = append(out, rec)
}
if isEOF {
break
}
}
return out, nil
}
func isTrailingNDJSONPartial(err error) bool {
if !errors.Is(err, io.ErrUnexpectedEOF) && !strings.Contains(err.Error(), "unexpected end of JSON input") {
return false
}
return true
}
func peekFirstNonSpace(br *bufio.Reader) (byte, error) {
for {
b, err := br.ReadByte()
if err != nil {
return 0, err
}
if !isSpace(b) {
if err := br.UnreadByte(); err != nil {
return 0, fmt.Errorf("unread byte: %w", err)
}
return b, nil
}
}
}
func isSpace(b byte) bool {
switch b {
case ' ', '\n', '\t', '\r':
return true
default:
return false
}
}
func (c *Client) fetchFromFile(after uint64, limit uint64) ([]types.ExportRecord, error) {
path := c.source
if strings.HasPrefix(path, "file://") {
path = strings.TrimPrefix(path, "file://")
}
path = filepath.Clean(path)
b, err := os.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("read source file: %w", err)
}
recs, err := decodeExportBody(bytes.NewReader(b), 0)
if err != nil {
return nil, err
}
out := make([]types.ExportRecord, 0, len(recs))
for _, r := range recs {
if r.Seq <= after {
continue
}
out = append(out, r)
if limit > 0 && uint64(len(out)) >= limit {
break
}
}
return out, nil
}
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