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influxdb.go
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influxdb.go
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package influxdb
import (
"bytes"
"context"
"errors"
"io/ioutil"
"net/http"
neturl "net/url"
"strings"
"time"
"github.com/influxdata/flux"
"github.com/influxdata/flux/codes"
fluxhttp "github.com/influxdata/flux/dependencies/http"
fluxurl "github.com/influxdata/flux/dependencies/url"
fluxerrors "github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/interpreter"
"github.com/influxdata/flux/runtime"
"github.com/influxdata/flux/semantic"
"github.com/influxdata/flux/values"
)
const (
APIFuncName = "api"
PackagePath = "experimental/influxdb"
APIKind = PackagePath + "." + APIFuncName
)
var APISignature = runtime.MustLookupBuiltinType(PackagePath, APIFuncName)
func init() {
runtime.RegisterPackageValue(PackagePath, APIFuncName,
values.NewFunction(APIFuncName, APISignature, api, true),
)
}
// api submits an HTTP request to the specified API path.
// Returns HTTP status code, response headers, and body as a byte array.
func api(ctx context.Context, a values.Object) (values.Value, error) {
var (
deps = flux.GetDependencies(ctx)
validator fluxurl.Validator
client fluxhttp.Client
err error
)
{
if validator, err = deps.URLValidator(); err != nil {
return nil, fluxerrors.New(codes.Internal, "missing dependencies")
}
if client, err = deps.HTTPClient(); err != nil {
return nil, fluxerrors.New(codes.Internal, "missing dependencies")
}
}
var (
args = interpreter.NewArguments(a)
method string
path string
host string
token string
headers values.Dictionary
query values.Dictionary
timeout values.Duration
body []byte
ok bool
)
{
if method, err = args.GetRequiredString("method"); err != nil {
return nil, err
}
if path, err = args.GetRequiredString("path"); err != nil {
return nil, err
}
if host, ok, err = args.GetString("host"); err != nil {
return nil, err
} else if !ok {
return nil, fluxerrors.New(codes.Invalid, `keyword argument "host" is required when executing outside InfluxDB`)
}
if token, ok, err = args.GetString("token"); err != nil {
return nil, err
} else if !ok {
return nil, fluxerrors.New(codes.Invalid, `keyword argument "token" is required when executing outside InfluxDB`)
}
if raw, ok := args.Get("timeout"); !ok {
timeout = values.ConvertDurationNsecs(30 * time.Second)
} else if raw.Type().Nature() != semantic.Duration {
return nil, fluxerrors.New(codes.Invalid, `keyword argument "timeout" must be a duration type`)
} else {
timeout = raw.Duration()
}
if query, _, err = args.GetDictionary("query"); err != nil {
return nil, err
}
if headers, _, err = args.GetDictionary("headers"); err != nil {
return nil, err
}
if b, ok := args.Get("body"); ok {
if b.Type().Nature() != semantic.Bytes {
return nil, fluxerrors.New(codes.Invalid, `keyword argument "body" must be a bytes type`)
}
body = b.Bytes()
}
}
var url string
{
u, err := neturl.Parse(host + path)
if err != nil {
return nil, err
}
if query != nil {
q := make(neturl.Values, query.Len())
query.Range(func(k values.Value, v values.Value) {
q.Set(k.Str(), v.Str())
})
u.RawQuery = q.Encode()
}
if err := validator.Validate(u); err != nil {
return nil, err
}
url = u.String()
}
var req *http.Request
{
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, timeout.Duration())
defer cancel()
req, err = http.NewRequestWithContext(ctx, strings.ToUpper(method), url, bytes.NewReader(body))
if err != nil {
return nil, err
}
if headers != nil {
headers.Range(func(k values.Value, v values.Value) {
req.Header.Set(k.Str(), v.Str())
})
}
req.Header.Set("Authorization", "Token "+token)
}
resp, err := client.Do(req)
if err != nil {
// Following the pattern set by the experimental/http.get implementation:
// Alias the DNS lookup error so as not to disclose the DNS server address.
// This error is private in the net/http package, so string matching is used.
if strings.HasSuffix(err.Error(), "no such host") {
return nil, errors.New("no such host")
}
return nil, err
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
responseHeaders, err := headerToDict(resp.Header)
if err != nil {
return nil, err
}
return values.NewObjectWithValues(map[string]values.Value{
"statusCode": values.NewInt(int64(resp.StatusCode)),
"headers": responseHeaders,
"body": values.NewBytes(b)}), nil
}
// headerToDict constructs a values.Dictionary from a map of header keys and values.
func headerToDict(header http.Header) (values.Dictionary, error) {
builder := values.NewDictBuilder(semantic.NewDictType(semantic.BasicString, semantic.BasicString))
for name, thevalues := range header {
for _, onevalue := range thevalues {
if err := builder.Insert(values.NewString(name), values.NewString(onevalue)); err != nil {
return nil, err
}
}
}
return builder.Dict(), nil
}