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source.go
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source.go
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package influxdb
import (
"bytes"
"context"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"net/url"
"github.com/influxdata/flux"
"github.com/influxdata/flux/ast"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/csv"
"github.com/influxdata/flux/dependencies/influxdb"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/memory"
)
type ProcedureSpec interface {
GetOrg() *NameOrID
GetHost() *string
GetToken() *string
SetOrg(org *NameOrID)
SetHost(host *string)
SetToken(token *string)
}
type RemoteProcedureSpec interface {
GetOrg() *NameOrID
GetHost() *string
GetToken() *string
BuildQuery() *ast.File
}
type source struct {
execute.ExecutionNode
id execute.DatasetID
spec RemoteProcedureSpec
deps flux.Dependencies
mem *memory.Allocator
ts execute.TransformationSet
}
func CreateSource(id execute.DatasetID, spec RemoteProcedureSpec, a execute.Administration) (execute.Source, error) {
deps := flux.GetDependencies(a.Context())
s := &source{
id: id,
spec: spec,
deps: deps,
mem: a.Allocator(),
}
if err := s.validateHost(*spec.GetHost()); err != nil {
return nil, err
}
return s, nil
}
func (s *source) AddTransformation(t execute.Transformation) {
s.ts = append(s.ts, t)
}
func (s *source) Run(ctx context.Context) {
err := s.run(ctx)
s.ts.Finish(s.id, err)
}
func (s *source) run(ctx context.Context) error {
req, err := s.newRequest(ctx)
if err != nil {
return err
}
client, err := s.deps.HTTPClient()
if err != nil {
return err
}
resp, err := client.Do(req)
if err != nil {
return err
} else if resp.StatusCode != 200 {
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return errors.Newf(codes.Invalid, "error when reading response body: %s", err)
}
return s.parseError(data)
}
return s.processResults(resp.Body)
}
func (s *source) validateHost(host string) error {
validator, err := s.deps.URLValidator()
if err != nil {
return err
}
u, err := url.Parse(host)
if err != nil {
return err
}
return validator.Validate(u)
}
func (s *source) newRequest(ctx context.Context) (*http.Request, error) {
u, err := url.Parse(*s.spec.GetHost())
if err != nil {
return nil, err
}
u.Path += "/api/v2/query"
if org := s.spec.GetOrg(); org != nil {
u.RawQuery = func() string {
params := make(url.Values)
if org.ID != "" {
params.Set("orgID", org.ID)
} else {
params.Set("org", org.Name)
}
return params.Encode()
}()
}
// Validate that the produced url is allowed.
urlv, err := s.deps.URLValidator()
if err != nil {
return nil, err
}
if err := urlv.Validate(u); err != nil {
return nil, err
}
body, err := s.newRequestBody()
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", u.String(), bytes.NewReader(body))
if err != nil {
return nil, err
}
if token := s.spec.GetToken(); token != nil {
req.Header.Set("Authorization", "Token "+*token)
}
req.Header.Set("Content-Type", "application/json")
return req.WithContext(ctx), nil
}
func (s *source) newRequestBody() ([]byte, error) {
var req struct {
Query string `json:"query"`
Dialect struct {
Header bool `json:"header"`
DateTimeFormat string `json:"dateTimeFormat"`
Annotations []string `json:"annotations"`
} `json:"dialect"`
}
// Build the query. This needs to be done first to build
// up the list of imports.
req.Query = ast.Format(s.spec.BuildQuery())
req.Dialect.Header = true
req.Dialect.DateTimeFormat = "RFC3339Nano"
req.Dialect.Annotations = []string{"group", "datatype", "default"}
return json.Marshal(req)
}
func (s *source) processResults(r io.ReadCloser) error {
defer func() { _ = r.Close() }()
config := csv.ResultDecoderConfig{Allocator: s.mem}
dec := csv.NewMultiResultDecoder(config)
results, err := dec.Decode(r)
if err != nil {
return err
}
defer results.Release()
for results.More() {
res := results.Next()
if err := res.Tables().Do(func(table flux.Table) error {
return s.ts.Process(s.id, table)
}); err != nil {
return err
}
}
results.Release()
return results.Err()
}
func (s *source) parseError(p []byte) error {
var e interface{}
if err := json.Unmarshal(p, &e); err != nil {
return err
}
return handleError(e)
}
type sourceIterator struct {
reader influxdb.Reader
mem *memory.Allocator
}
func (s *sourceIterator) Do(ctx context.Context, f func(flux.Table) error) error {
return s.reader.Read(ctx, f, s.mem)
}