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Support for AWS Elasticsearch using AWS SDK v2 (prometheus-community#597
) * Support for AWS Elasticsearch using AWS SDK v2 (#1) Signed-off-by: Roshan Patil <patilroshan443@gmail.com> * Fixes PR comments Signed-off-by: Roshan Patil <patilroshan443@gmail.com> * Resolved PR comments Signed-off-by: Roshan Patil <patilroshan443@gmail.com> * Fix PR comments Signed-off-by: Roshan Patil <patilroshan443@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // Copyright 2022 The Prometheus Authors | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package roundtripper | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "io" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/aws/aws-sdk-go-v2/aws" | ||
| v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4" | ||
| "github.com/aws/aws-sdk-go-v2/config" | ||
| "github.com/go-kit/log" | ||
| "github.com/go-kit/log/level" | ||
| ) | ||
|
|
||
| const ( | ||
| service = "es" | ||
| ) | ||
|
|
||
| type AWSSigningTransport struct { | ||
| t http.RoundTripper | ||
| creds aws.Credentials | ||
| region string | ||
| log log.Logger | ||
| } | ||
|
|
||
| func NewAWSSigningTransport(transport http.RoundTripper, region string, log log.Logger) (*AWSSigningTransport, error) { | ||
| cfg, err := config.LoadDefaultConfig(context.Background(), config.WithRegion(region)) | ||
| if err != nil { | ||
| _ = level.Error(log).Log("msg", "fail to load aws default config", "err", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| creds, err := cfg.Credentials.Retrieve(context.Background()) | ||
| if err != nil { | ||
| _ = level.Error(log).Log("msg", "fail to retrive aws credentials", "err", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| return &AWSSigningTransport{ | ||
| t: transport, | ||
| region: region, | ||
| creds: creds, | ||
| log: log, | ||
| }, err | ||
| } | ||
|
|
||
| func (a *AWSSigningTransport) RoundTrip(req *http.Request) (*http.Response, error) { | ||
| signer := v4.NewSigner() | ||
| payloadHash, newReader, err := hashPayload(req.Body) | ||
| if err != nil { | ||
| _ = level.Error(a.log).Log("msg", "fail to hash request body", "err", err) | ||
| return nil, err | ||
| } | ||
| req.Body = newReader | ||
| err = signer.SignHTTP(context.Background(), a.creds, req, payloadHash, service, a.region, time.Now()) | ||
| if err != nil { | ||
| _ = level.Error(a.log).Log("msg", "fail to sign request body", "err", err) | ||
| return nil, err | ||
| } | ||
| return a.t.RoundTrip(req) | ||
| } | ||
|
|
||
| func hashPayload(r io.ReadCloser) (string, io.ReadCloser, error) { | ||
| var newReader io.ReadCloser | ||
| payload := []byte("") | ||
| if r != nil { | ||
| defer r.Close() | ||
| payload, err := ioutil.ReadAll(r) | ||
| if err != nil { | ||
| return "", newReader, err | ||
| } | ||
| newReader = ioutil.NopCloser(bytes.NewReader(payload)) | ||
| } | ||
| hash := sha256.Sum256(payload) | ||
| payloadHash := hex.EncodeToString(hash[:]) | ||
| return payloadHash, newReader, nil | ||
| } |