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Rewrite emailservice in ruby (open-telemetry#109)
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* feat: rewrite emailservice in ruby

Rather than use GRPC, we reimplement the emailservice as a simple HTTP
application, using Sinatra and OpenTelemetry auto-instrumentation. We
can do this because our use of GRPC in this instance is not very
complicated - we can just serialize the protobuf request to JSON and
send it over HTTP instead, and it's pretty straightforward.

Probably the most interesting part here is that we're rendering the
email text right into the logfile, which might be noisy. We can revisit
that decision if needed.

* feat: call emailservice via HTTP POST

This commit causes the checkoutservice to call emailservice via HTTP
POST. We leverage the golang net/http autoinstrumentation to create the
spans and propagate context correctly for us.

* feat: modify setup to work with otel/ruby

Because we rewrote the emailservice as an HTTP service, we need to
modify the `EMAIL_SERVICE_ADDR` to reflect the actual scheme (`http`).
We could just do some more string concatenation in the app, I guess.

We pin to a specific collector version - I was getting weird segfaults
with whatever version of the collector was already on my machine, and
they were resolved with 0.52.0. However, that also required a minor
config change to the jaeger exporter. Yay, M1 macs!

We can't specify the otlp/grpc port for the ruby libraries, it won't
work. So for email service we pass the correct OTLP/HTTP URL in the env
var.

* docs: note that emailservice is now ruby

* fixup: remove `loglevel: debug` from otel-col config

Whoops, this was accidentally left in from my testing.

* fixup: appease markdownlint
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ahayworth authored and GaryPWhite committed Jun 30, 2022
1 parent fc730cc commit 916e195
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Showing 21 changed files with 197 additions and 3,041 deletions.
2 changes: 1 addition & 1 deletion .env
Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ CURRENCY_SERVICE_PORT=7000
CURRENCY_SERVICE_ADDR=currencyservice:${CURRENCY_SERVICE_PORT}

EMAIL_SERVICE_PORT=8080
EMAIL_SERVICE_ADDR=emailservice:${EMAIL_SERVICE_PORT}
EMAIL_SERVICE_ADDR=http://emailservice:${EMAIL_SERVICE_PORT}

PAYMENT_SERVICE_PORT=50051
PAYMENT_SERVICE_ADDR=paymentservice:${PAYMENT_SERVICE_PORT}
Expand Down
4 changes: 2 additions & 2 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -113,7 +113,7 @@ cache[(Cache<br/>&#40redis&#41)]
cartservice(Cart Service<br/>&#40.NET&#41):::dotnet
checkoutservice(Checkout Service<br/>&#40Go&#41):::golang
currencyservice(Currency Service<br/>&#40Node.js&#41):::nodejs
emailservice(Email Service<br/>&#40Python&#41):::python
emailservice(Email Service<br/>&#40Ruby&#41):::ruby
frontend(Frontend<br/>&#40Go&#41):::golang
loadgenerator([Load Generator<br/>&#40Python&#41]):::python
paymentservice(Payment Service<br/>&#40Node.js&#41):::nodejs
Expand Down Expand Up @@ -152,7 +152,7 @@ Find **Protocol Buffers Descriptions** at the [`./pb` directory](./pb/README.md)
| [currencyservice](./src/currencyservice/README.md) | Node.js | Converts one money amount to another currency. Uses real values fetched from European Central Bank. It's the highest QPS service. |
| [paymentservice](./src/paymentservice/README.md) | Node.js | Charges the given credit card info (mock) with the given amount and returns a transaction ID. |
| [shippingservice](./src/shippingservice/README.md) | Go | Gives shipping cost estimates based on the shopping cart. Ships items to the given address (mock) |
| [emailservice](./src/emailservice/README.md) | Python | Sends users an order confirmation email (mock). |
| [emailservice](./src/emailservice/README.md) | Ruby | Sends users an order confirmation email (mock). |
| [checkoutservice](./src/checkoutservice/README.md) | Go | Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification. |
| [recommendationservice](./src/recommendationservice/README.md) | Python | Recommends other products based on what's given in the cart. |
| [adservice](./src/adservice/README.md) | Java | Provides text ads based on given context words. |
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6 changes: 3 additions & 3 deletions compose.yml
Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ services:

# Collector
otelcol:
image: otel/opentelemetry-collector
image: otel/opentelemetry-collector:0.52.0
command: [ "--config=/etc/otelcol-config.yml" ]
volumes:
- ./src/otelcollector/otelcol-config.yml:/etc/otelcol-config.yml
Expand Down Expand Up @@ -103,9 +103,9 @@ services:
ports:
- "${EMAIL_SERVICE_PORT}"
environment:
- APP_ENV=production
- PORT=${EMAIL_SERVICE_PORT}
- OTEL_PYTHON_LOG_CORRELATION=true
- OTEL_EXPORTER_OTLP_TRACES_ENDPOINT
- OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://otelcol:4318/v1/traces
- OTEL_RESOURCE_ATTRIBUTES=service.name=emailservice
depends_on:
- otelcol
Expand Down
4 changes: 4 additions & 0 deletions src/checkoutservice/go.mod
Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,15 @@ require (
require (
cloud.google.com/go/compute v0.1.0 // indirect
github.com/cenkalti/backoff/v4 v4.1.2 // indirect
github.com/felixge/httpsnoop v1.0.2 // indirect
github.com/go-logr/logr v1.2.2 // indirect
github.com/go-logr/stdr v1.2.2 // indirect
github.com/golang/protobuf v1.5.2 // indirect
github.com/grpc-ecosystem/grpc-gateway v1.16.0 // indirect
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.29.0 // indirect
go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1 // indirect
go.opentelemetry.io/otel/internal/metric v0.27.0 // indirect
go.opentelemetry.io/otel/metric v0.27.0 // indirect
go.opentelemetry.io/otel/trace v1.4.1 // indirect
go.opentelemetry.io/proto/otlp v0.12.0 // indirect
golang.org/x/net v0.0.0-20220121210141-e204ce36a2ba // indirect
Expand Down
20 changes: 20 additions & 0 deletions src/checkoutservice/go.sum
Original file line number Diff line number Diff line change
Expand Up @@ -81,12 +81,16 @@ github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.m
github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.mod h1:AFq3mo9L8Lqqiid3OhADV3RfLJnjiw63cSpi+fDTRC0=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/felixge/httpsnoop v1.0.2 h1:+nS9g82KMXccJ/wp0zyRW9ZBHFETmMGtkk+2CTTrW4o=
github.com/felixge/httpsnoop v1.0.2/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
github.com/go-logr/logr v1.2.2 h1:ahHml/yUpnlb96Rp8HCvtYVPY8ZYpxq3g7UYchIYwbs=
github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0=
github.com/go-logr/logr v1.2.3/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
Expand Down Expand Up @@ -190,6 +194,8 @@ github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
Expand All @@ -204,20 +210,34 @@ go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.29.0 h1:n9b7AAdbQtQ0k9dm0Dm2/KUcUqtG8i2O15KzNaDze8c=
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.29.0/go.mod h1:LsankqVDx4W+RhZNA5uWarULII/MBhF5qwCYxTuyXjs=
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.29.0 h1:SLme4Porm+UwX0DdHMxlwRt7FzPSE0sys81bet2o0pU=
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.29.0/go.mod h1:tLYsuf2v8fZreBVwp9gVMhefZlLFZaUiNVSq8QxXRII=
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.32.0 h1:mac9BKRqwaX6zxHPDe3pvmWpwuuIM0vuXv2juCnQevE=
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.32.0/go.mod h1:5eCOqeGphOyz6TsY3ZDNjE33SM/TFAK3RGuCL2naTgY=
go.opentelemetry.io/otel v1.4.0/go.mod h1:jeAqMFKy2uLIxCtKxoFj0FAL5zAPKQagc3+GtBWakzk=
go.opentelemetry.io/otel v1.4.1 h1:QbINgGDDcoQUoMJa2mMaWno49lja9sHwp6aoa2n3a4g=
go.opentelemetry.io/otel v1.4.1/go.mod h1:StM6F/0fSwpd8dKWDCdRr7uRvEPYdW0hBSlbdTiUde4=
go.opentelemetry.io/otel v1.7.0 h1:Z2lA3Tdch0iDcrhJXDIlC94XE+bxok1F9B+4Lz/lGsM=
go.opentelemetry.io/otel v1.7.0/go.mod h1:5BdUoMIz5WEs0vt0CUEMtSSaTSHBBVwrhnz7+nrD5xk=
go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1 h1:imIM3vRDMyZK1ypQlQlO+brE22I9lRhJsBDXpDWjlz8=
go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1/go.mod h1:VpP4/RMn8bv8gNo9uK7/IMY4mtWLELsS+JIP0inH0h4=
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.4.1 h1:WPpPsAAs8I2rA47v5u0558meKmmwm1Dj99ZbqCV8sZ8=
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.4.1/go.mod h1:o5RW5o2pKpJLD5dNTCmjF1DorYwMeFJmb/rKr5sLaa8=
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.4.1 h1:AxqDiGk8CorEXStMDZF5Hz9vo9Z7ZZ+I5m8JRl/ko40=
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.4.1/go.mod h1:c6E4V3/U+miqjs/8l950wggHGL1qzlp0Ypj9xoGrPqo=
go.opentelemetry.io/otel/internal/metric v0.27.0 h1:9dAVGAfFiiEq5NVB9FUJ5et+btbDQAUIJehJ+ikyryk=
go.opentelemetry.io/otel/internal/metric v0.27.0/go.mod h1:n1CVxRqKqYZtqyTh9U/onvKapPGv7y/rpyOTI+LFNzw=
go.opentelemetry.io/otel/metric v0.27.0 h1:HhJPsGhJoKRSegPQILFbODU56NS/L1UE4fS1sC5kIwQ=
go.opentelemetry.io/otel/metric v0.27.0/go.mod h1:raXDJ7uP2/Jc0nVZWQjJtzoyssOYWu/+pjZqRzfvZ7g=
go.opentelemetry.io/otel/metric v0.30.0 h1:Hs8eQZ8aQgs0U49diZoaS6Uaxw3+bBE3lcMUKBFIk3c=
go.opentelemetry.io/otel/metric v0.30.0/go.mod h1:/ShZ7+TS4dHzDFmfi1kSXMhMVubNoP0oIaBp70J6UXU=
go.opentelemetry.io/otel/sdk v1.4.1 h1:J7EaW71E0v87qflB4cDolaqq3AcujGrtyIPGQoZOB0Y=
go.opentelemetry.io/otel/sdk v1.4.1/go.mod h1:NBwHDgDIBYjwK2WNu1OPgsIc2IJzmBXNnvIJxJc8BpE=
go.opentelemetry.io/otel/trace v1.4.0/go.mod h1:uc3eRsqDfWs9R7b92xbQbU42/eTNz4N+gLP8qJCi4aE=
go.opentelemetry.io/otel/trace v1.4.1 h1:O+16qcdTrT7zxv2J6GejTPFinSwA++cYerC5iSiF8EQ=
go.opentelemetry.io/otel/trace v1.4.1/go.mod h1:iYEVbroFCNut9QkwEczV9vMRPHNKSSwYZjulEtsmhFc=
go.opentelemetry.io/otel/trace v1.7.0 h1:O37Iogk1lEkMRXewVtZ1BBTVn5JEp8GrJvP92bJqC6o=
go.opentelemetry.io/otel/trace v1.7.0/go.mod h1:fzLSB9nqR2eXzxPXb2JW9IKE+ScyXA48yyE4TNvoHqU=
go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
go.opentelemetry.io/proto/otlp v0.12.0 h1:CMJ/3Wp7iOWES+CYLfnBv+DVmPbB+kmy9PJ92XvlR6c=
go.opentelemetry.io/proto/otlp v0.12.0/go.mod h1:TsIjwGWIx5VFYv9KGVlOpxoBl5Dy+63SUguV7GGvlSQ=
Expand Down
26 changes: 20 additions & 6 deletions src/checkoutservice/main.go
Original file line number Diff line number Diff line change
Expand Up @@ -15,9 +15,12 @@
package main

import (
"bytes"
"context"
"encoding/json"
"fmt"
"net"
"net/http"
"os"
"time"

Expand All @@ -29,6 +32,7 @@ import (
"google.golang.org/grpc/status"

"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
Expand Down Expand Up @@ -333,14 +337,24 @@ func (cs *checkoutService) chargeCard(ctx context.Context, amount *pb.Money, pay
}

func (cs *checkoutService) sendOrderConfirmation(ctx context.Context, email string, order *pb.OrderResult) error {
conn, err := createClient(ctx, cs.emailSvcAddr)
emailServicePayload, err := json.Marshal(map[string]interface{}{
"email": email,
"order": order,
})
if err != nil {
return fmt.Errorf("failed to connect email service: %+v", err)
return fmt.Errorf("failed to marshal order to JSON: %+v", err)
}
defer conn.Close()
_, err = pb.NewEmailServiceClient(conn).SendOrderConfirmation(ctx, &pb.SendOrderConfirmationRequest{
Email: email,
Order: order})

resp, err := otelhttp.Post(ctx, cs.emailSvcAddr+"/send_order_confirmation", "application/json", bytes.NewBuffer(emailServicePayload))
if err != nil {
return fmt.Errorf("failed POST to email service: %+v", err)
}
defer resp.Body.Close()

if resp.StatusCode != http.StatusOK {
return fmt.Errorf("failed POST to email service: expected 200, got %d", resp.StatusCode)
}

return err
}

Expand Down
1 change: 1 addition & 0 deletions src/emailservice/.ruby-version
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
3.1.2
22 changes: 4 additions & 18 deletions src/emailservice/Dockerfile
Original file line number Diff line number Diff line change
Expand Up @@ -12,28 +12,14 @@
# See the License for the specific language governing permissions and
# limitations under the License.

FROM python:3.10-slim
FROM ruby:3.1.2

# get packages
COPY requirements.txt .
RUN pip install -r requirements.txt

# Enable unbuffered logging
ENV PYTHONUNBUFFERED=1

RUN apt-get -qq update \
&& apt-get install -y --no-install-recommends \
wget

# Download the grpc health probe
RUN GRPC_HEALTH_PROBE_VERSION=v0.4.7 && \
wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-amd64 && \
chmod +x /bin/grpc_health_probe
COPY Gemfile* .
RUN bundle install

WORKDIR /email_server

# Add the application
COPY . .

EXPOSE 8080
ENTRYPOINT [ "opentelemetry-instrument", "python", "email_server.py" ]
ENTRYPOINT ["bundle", "exec", "ruby", "email_server.rb"]
10 changes: 10 additions & 0 deletions src/emailservice/Gemfile
Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
source "https://rubygems.org"

gem "net-smtp", "~> 0.3"
gem "pony", "~> 1.13"
gem "puma", "~> 5.6"
gem "sinatra", "~> 2.2"

gem "opentelemetry-sdk", "~> 1.1"
gem "opentelemetry-exporter-otlp", "~> 0.21"
gem "opentelemetry-instrumentation-sinatra", "~> 0.19"
74 changes: 74 additions & 0 deletions src/emailservice/Gemfile.lock
Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
GEM
remote: https://rubygems.org/
specs:
digest (3.1.0)
google-protobuf (3.21.1)
googleapis-common-protos-types (1.3.1)
google-protobuf (~> 3.14)
mail (2.7.1)
mini_mime (>= 0.1.1)
mini_mime (1.1.2)
mustermann (1.1.1)
ruby2_keywords (~> 0.0.1)
net-protocol (0.1.3)
timeout
net-smtp (0.3.1)
digest
net-protocol
timeout
nio4r (2.5.8)
opentelemetry-api (1.0.2)
opentelemetry-common (0.19.6)
opentelemetry-api (~> 1.0)
opentelemetry-exporter-otlp (0.21.3)
google-protobuf (~> 3.19)
googleapis-common-protos-types (~> 1.3)
opentelemetry-api (~> 1.0)
opentelemetry-common (~> 0.19.3)
opentelemetry-sdk (~> 1.0)
opentelemetry-semantic_conventions
opentelemetry-instrumentation-base (0.20.0)
opentelemetry-api (~> 1.0)
opentelemetry-instrumentation-sinatra (0.19.4)
opentelemetry-api (~> 1.0)
opentelemetry-common (~> 0.19.3)
opentelemetry-instrumentation-base (~> 0.20.0)
opentelemetry-registry (0.1.0)
opentelemetry-api (~> 1.0.1)
opentelemetry-sdk (1.1.0)
opentelemetry-api (~> 1.0)
opentelemetry-common (~> 0.19.3)
opentelemetry-registry (~> 0.1)
opentelemetry-semantic_conventions
opentelemetry-semantic_conventions (1.8.0)
opentelemetry-api (~> 1.0)
pony (1.13.1)
mail (>= 2.0)
puma (5.6.4)
nio4r (~> 2.0)
rack (2.2.3.1)
rack-protection (2.2.0)
rack
ruby2_keywords (0.0.5)
sinatra (2.2.0)
mustermann (~> 1.0)
rack (~> 2.2)
rack-protection (= 2.2.0)
tilt (~> 2.0)
tilt (2.0.10)
timeout (0.3.0)

PLATFORMS
arm64-darwin-21

DEPENDENCIES
net-smtp (~> 0.3)
opentelemetry-exporter-otlp (~> 0.21)
opentelemetry-instrumentation-sinatra (~> 0.19)
opentelemetry-sdk (~> 1.1)
pony (~> 1.13)
puma (~> 5.6)
sinatra (~> 2.2)

BUNDLED WITH
2.3.7
24 changes: 22 additions & 2 deletions src/emailservice/README.md
Original file line number Diff line number Diff line change
@@ -1,3 +1,23 @@
# Read Me
# Email Service

This is a placeholder
The Email service "sends" an email to the customer with their order details by
rendering it as a log message. It expects a JSON payload like:

```json
{
"email": "some.address@website.com",
"order": "<serialized order protobuf>"
}
```

## Building locally

We use `bundler` to manage dependencies. To get started, simply `bundle install`.

## Running locally

You may run this service locally with `bundle exec ruby email_server.rb`.

## Building docker image

From `src/emailservice`, run `docker build .`

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