feat(platform): add ability to query sources

Currently all  that is supported is v1 sources. This code will likely
need revisiting.

Co-authored-by: Andrew Watkins <andrew.watkinz@gmail.com>
Co-authored-by: Michael Desa <mjdesa@gmail.com>

bolt/source.go

@@ -270,6 +270,9 @@ func (c *Client) setServices(ctx context.Context, s *platform.Source) error {
 		s.BucketService = &influxdb.BucketService{
 			Source: s,
 		}
+		s.SourceQuerier = &influxdb.SourceQuerier{
+			Source: s,
+		}
 	default:
 		return fmt.Errorf("unsupported source type %s", s.Type)
 	}

http/influxdb/query.go

@@ -0,0 +1,56 @@
+package influxdb
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+
+	"github.com/influxdata/platform"
+	"github.com/influxdata/platform/chronograf"
+)
+
+// SourceQuerier connects to Influx via HTTP using tokens to manage buckets
+type SourceQuerier struct {
+	Source *platform.Source
+}
+
+func (s *SourceQuerier) Query(ctx context.Context, q *platform.SourceQuery) (*platform.SourceQueryResult, error) {
+	switch q.Type {
+	case "influxql":
+		return s.influxQuery(ctx, q)
+	case "flux":
+		return s.fluxQuery(ctx, q)
+	}
+
+	return nil, fmt.Errorf("unsupport language %v", q.Type)
+}
+
+func (s *SourceQuerier) influxQuery(ctx context.Context, q *platform.SourceQuery) (*platform.SourceQueryResult, error) {
+	c, err := newClient(s.Source)
+	if err != nil {
+		return nil, err
+	}
+
+	query := chronograf.Query{
+		Command: q.Query,
+		// TODO(specify database)
+	}
+
+	res, err := c.Query(ctx, query)
+	if err != nil {
+		return nil, err
+	}
+
+	b, err := res.MarshalJSON()
+	if err != nil {
+		return nil, err
+	}
+
+	return &platform.SourceQueryResult{
+		Reader: bytes.NewReader(b),
+	}, nil
+}
+
+func (s *SourceQuerier) fluxQuery(ctx context.Context, q *platform.SourceQuery) (*platform.SourceQueryResult, error) {
+	panic("not implemented")
+}

http/platform_handler.go

@@ -30,6 +30,18 @@ func setCORSResponseHeaders(w nethttp.ResponseWriter, r *nethttp.Request) {
 	}
 }
 
+var platformLinks = map[string]interface{}{
+	"sources": "/v2/sources",
+}
+
+func (h *PlatformHandler) serveLinks(w nethttp.ResponseWriter, r *nethttp.Request) {
+	ctx := r.Context()
+	if err := encodeResponse(ctx, w, nethttp.StatusOK, platformLinks); err != nil {
+		EncodeError(ctx, err, w)
+		return
+	}
+}
+
 // ServeHTTP delegates a request to the appropriate subhandler.
 func (h *PlatformHandler) ServeHTTP(w nethttp.ResponseWriter, r *nethttp.Request) {
 
@@ -40,13 +52,18 @@ func (h *PlatformHandler) ServeHTTP(w nethttp.ResponseWriter, r *nethttp.Request
 
 	// Server the chronograf assets for any basepath that does not start with addressable parts
 	// of the platform API.
-	if !strings.HasPrefix(r.URL.Path, "/v1/") &&
-		!strings.HasPrefix(r.URL.Path, "/v2/") &&
+	if !strings.HasPrefix(r.URL.Path, "/v1") &&
+		!strings.HasPrefix(r.URL.Path, "/v2") &&
 		!strings.HasPrefix(r.URL.Path, "/chronograf/") {
 		h.AssetHandler.ServeHTTP(w, r)
 		return
 	}
 
+	if r.URL.Path == "/v2" {
+		h.serveLinks(w, r)
+		return
+	}
+
 	if strings.HasPrefix(r.URL.Path, "/chronograf/") {
 		h.ChronografHandler.ServeHTTP(w, r)
 		return
@@ -55,8 +72,8 @@ func (h *PlatformHandler) ServeHTTP(w nethttp.ResponseWriter, r *nethttp.Request
 	ctx := r.Context()
 	var err error
 	if ctx, err = extractAuthorization(ctx, r); err != nil {
-		nethttp.Error(w, err.Error(), nethttp.StatusBadRequest)
-		return
+		// TODO(desa): add back eventually when things have settled
+		//nethttp.Error(w, err.Error(), nethttp.StatusBadRequest)
 	}
 	r = r.WithContext(ctx)
 

http/source_service.go

@@ -4,17 +4,64 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"fmt"
+	"io"
 	"net/http"
 	"path"
 
+	"go.uber.org/zap"
+
 	"github.com/influxdata/platform"
 	kerrors "github.com/influxdata/platform/kit/errors"
 	"github.com/julienschmidt/httprouter"
 )
 
+const (
+	sourceHTTPPath = "/v2/sources"
+)
+
+type sourceResponse struct {
+	*platform.Source
+	Links map[string]interface{} `json:"links"`
+}
+
+func newSourceResponse(s *platform.Source) *sourceResponse {
+	s.Password = ""
+	s.SharedSecret = ""
+	return &sourceResponse{
+		Source: s,
+		Links: map[string]interface{}{
+			"self":    fmt.Sprintf("%s/%s", sourceHTTPPath, s.ID.String()),
+			"query":   fmt.Sprintf("%s/%s/query", sourceHTTPPath, s.ID.String()),
+			"buckets": fmt.Sprintf("%s/%s/buckets", sourceHTTPPath, s.ID.String()),
+		},
+	}
+}
+
+type sourcesResponse struct {
+	Sources []*sourceResponse      `json:"sources"`
+	Links   map[string]interface{} `json:"links"`
+}
+
+func newSourcesResponse(srcs []*platform.Source) *sourcesResponse {
+	res := &sourcesResponse{
+		Links: map[string]interface{}{
+			"self": sourceHTTPPath,
+		},
+	}
+
+	res.Sources = make([]*sourceResponse, 0, len(srcs))
+	for _, src := range srcs {
+		res.Sources = append(res.Sources, newSourceResponse(src))
+	}
+
+	return res
+}
+
 // SourceHandler is a handler for sources
 type SourceHandler struct {
 	*httprouter.Router
+	Logger *zap.Logger
 
 	SourceService platform.SourceService
 }
@@ -23,6 +70,7 @@ type SourceHandler struct {
 func NewSourceHandler() *SourceHandler {
 	h := &SourceHandler{
 		Router: httprouter.New(),
+		Logger: zap.NewNop(),
 	}
 
 	h.HandlerFunc("POST", "/v2/sources", h.handlePostSource)
@@ -32,9 +80,61 @@ func NewSourceHandler() *SourceHandler {
 	h.HandlerFunc("DELETE", "/v2/sources/:id", h.handleDeleteSource)
 
 	h.HandlerFunc("GET", "/v2/sources/:id/buckets", h.handleGetSourcesBuckets)
+	h.HandlerFunc("POST", "/v2/sources/:id/query", h.handlePostSourceQuery)
 	return h
 }
 
+// handlePostSourceQuery is the HTTP handler for POST /v2/sources/:id/query
+func (h *SourceHandler) handlePostSourceQuery(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	req, err := decodePostSourceQuery(ctx, r)
+	if err != nil {
+		EncodeError(ctx, err, w)
+		return
+	}
+
+	s, err := h.SourceService.FindSourceByID(ctx, req.SourceID)
+	if err != nil {
+		EncodeError(ctx, err, w)
+		return
+	}
+
+	res, err := s.SourceQuerier.Query(ctx, req.sourceQuery)
+	if err != nil {
+		EncodeError(ctx, err, w)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	if _, err := io.Copy(w, res.Reader); err != nil {
+		h.Logger.Info("error copying query response", zap.Error(err))
+	}
+
+}
+
+type postSourceQuery struct {
+	*getSourceRequest
+	sourceQuery *platform.SourceQuery
+}
+
+func decodePostSourceQuery(ctx context.Context, r *http.Request) (*postSourceQuery, error) {
+	getSrcReq, err := decodeGetSourceRequest(ctx, r)
+	if err != nil {
+		return nil, err
+	}
+
+	q := &platform.SourceQuery{}
+	if err := json.NewDecoder(r.Body).Decode(q); err != nil {
+		return nil, err
+	}
+
+	return &postSourceQuery{
+		getSourceRequest: getSrcReq,
+		sourceQuery:      q,
+	}, nil
+}
+
 // handleGetSourcesBuckets is the HTTP handler for the GET /v2/sources/:id/buckets route.
 func (h *SourceHandler) handleGetSourcesBuckets(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
@@ -130,13 +230,15 @@ func (h *SourceHandler) handleGetSource(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	b, err := h.SourceService.FindSourceByID(ctx, req.SourceID)
+	s, err := h.SourceService.FindSourceByID(ctx, req.SourceID)
 	if err != nil {
 		EncodeError(ctx, err, w)
 		return
 	}
 
-	if err := encodeResponse(ctx, w, http.StatusOK, b); err != nil {
+	res := newSourceResponse(s)
+
+	if err := encodeResponse(ctx, w, http.StatusOK, res); err != nil {
 		EncodeError(ctx, err, w)
 		return
 	}
@@ -214,13 +316,15 @@ func (h *SourceHandler) handleGetSources(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	bs, _, err := h.SourceService.FindSources(ctx, req.findOptions)
+	srcs, _, err := h.SourceService.FindSources(ctx, req.findOptions)
 	if err != nil {
 		EncodeError(ctx, err, w)
 		return
 	}
 
-	if err := encodeResponse(ctx, w, http.StatusOK, bs); err != nil {
+	res := newSourcesResponse(srcs)
+
+	if err := encodeResponse(ctx, w, http.StatusOK, res); err != nil {
 		EncodeError(ctx, err, w)
 		return
 	}

query.go

@@ -0,0 +1,25 @@
+package platform
+
+import (
+	"context"
+	"io"
+)
+
+// TODO(desa): These files are possibly a temporary. This is needed
+// as a part of the source work that is being done.
+
+// SourceQuery is a query for a source.
+type SourceQuery struct {
+	Query string `json:"query"`
+	Type  string `json:"type"`
+}
+
+// SourceQueryResult is a result of a source query.
+type SourceQueryResult struct {
+	Reader io.Reader
+}
+
+// SourceQuerier allows for the querying of sources.
+type SourceQuerier interface {
+	Query(ctx context.Context, q *SourceQuery) (*SourceQueryResult, error)
+}

source.go

@@ -40,6 +40,8 @@ type Source struct {
 	V1SourceFields
 
 	BucketService BucketService `json:"-"`
+	// TODO(desa): is this a good idea?
+	SourceQuerier SourceQuerier `json:"-"`
 }
 
 // V1SourceFields are the fields for connecting to a 1.0 source (oss or enterprise)

testing/source.go

@@ -24,7 +24,7 @@ var sourceCmpOptions = cmp.Options{
 	cmp.Comparer(func(x, y []byte) bool {
 		return bytes.Equal(x, y)
 	}),
-	cmpopts.IgnoreFields(platform.Source{}, "BucketService"),
+	cmpopts.IgnoreFields(platform.Source{}, "SourceQuerier", "BucketService"),
 	cmp.Transformer("Sort", func(in []*platform.Source) []*platform.Source {
 		out := append([]*platform.Source(nil), in...) // Copy input to avoid mutating it
 		sort.Slice(out, func(i, j int) bool {