snapshot of https://github.com/ThreeDotsLabs/watermill.git (master, 2026-09-15; blobs > 131072B omitted)
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4
_examples/pubsubs/sql/.validate_example.yml
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4
_examples/pubsubs/sql/.validate_example.yml
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validation_cmd: "docker compose up"
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teardown_cmd: "docker compose down"
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timeout: 180
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expected_output: "Hello, world!"
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20
_examples/pubsubs/sql/docker-compose.yml
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20
_examples/pubsubs/sql/docker-compose.yml
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services:
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server:
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image: golang:1.25
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restart: unless-stopped
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depends_on:
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- mysql
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volumes:
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- .:/app
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- $GOPATH/pkg/mod:/go/pkg/mod
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working_dir: /app
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command: go run main.go
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mysql:
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image: mysql:8.0
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restart: unless-stopped
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ports:
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- 3306:3306
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environment:
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MYSQL_DATABASE: watermill
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MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
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24
_examples/pubsubs/sql/go.mod
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24
_examples/pubsubs/sql/go.mod
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module main.go
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go 1.25.0
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require (
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github.com/ThreeDotsLabs/watermill v1.5.1
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github.com/ThreeDotsLabs/watermill-sql/v4 v4.1.3
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github.com/go-sql-driver/mysql v1.10.0
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)
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require (
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filippo.io/edwards25519 v1.2.0 // indirect
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github.com/cenkalti/backoff/v5 v5.0.3 // indirect
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github.com/google/uuid v1.6.0 // indirect
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github.com/jackc/pgpassfile v1.0.0 // indirect
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github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
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github.com/jackc/pgx/v5 v5.9.2 // indirect
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github.com/lib/pq v1.12.3 // indirect
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github.com/lithammer/shortuuid/v3 v3.0.7 // indirect
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github.com/oklog/ulid v1.3.1 // indirect
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github.com/pkg/errors v0.9.1 // indirect
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github.com/sony/gobreaker v1.0.0 // indirect
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golang.org/x/text v0.37.0 // indirect
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)
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49
_examples/pubsubs/sql/go.sum
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49
_examples/pubsubs/sql/go.sum
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filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo=
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filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc=
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github.com/ThreeDotsLabs/watermill v1.5.1 h1:t5xMivyf9tpmU3iozPqyrCZXHvoV1XQDfihas4sV0fY=
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github.com/ThreeDotsLabs/watermill v1.5.1/go.mod h1:Uop10dA3VeJWsSvis9qO3vbVY892LARrKAdki6WtXS4=
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github.com/ThreeDotsLabs/watermill-sql/v4 v4.1.3 h1:d9niNUM3G9nFH2YRdJ7F+qz3IF0bS2IHq6UB2TKWHGE=
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github.com/ThreeDotsLabs/watermill-sql/v4 v4.1.3/go.mod h1:Ce2GVZVnyajAh0AkwxSJXwx8ajBBveu1DI/yatan5jc=
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github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
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github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/go-sql-driver/mysql v1.10.0 h1:Q+1LV8DkHJvSYAdR83XzuhDaTykuDx0l6fkXxoWCWfw=
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github.com/go-sql-driver/mysql v1.10.0/go.mod h1:M+cqaI7+xxXGG9swrdeUIoPG3Y3KCkF0pZej+SK+nWk=
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github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
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github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
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github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
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github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
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github.com/jackc/pgx/v5 v5.9.2 h1:3ZhOzMWnR4yJ+RW1XImIPsD1aNSz4T4fyP7zlQb56hw=
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github.com/jackc/pgx/v5 v5.9.2/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM0Jn4=
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github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
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github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
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github.com/lib/pq v1.12.3 h1:tTWxr2YLKwIvK90ZXEw8GP7UFHtcbTtty8zsI+YjrfQ=
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github.com/lib/pq v1.12.3/go.mod h1:/p+8NSbOcwzAEI7wiMXFlgydTwcgTr3OSKMsD2BitpA=
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github.com/lithammer/shortuuid/v3 v3.0.7 h1:trX0KTHy4Pbwo/6ia8fscyHoGA+mf1jWbPJVuvyJQQ8=
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github.com/lithammer/shortuuid/v3 v3.0.7/go.mod h1:vMk8ke37EmiewwolSO1NLW8vP4ZaKlRuDIi8tWWmAts=
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github.com/oklog/ulid v1.3.1 h1:EGfNDEx6MqHz8B3uNV6QAib1UR2Lm97sHi3ocA6ESJ4=
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github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
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github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
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github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/sony/gobreaker v1.0.0 h1:feX5fGGXSl3dYd4aHZItw+FpHLvvoaqkawKjVNiFMNQ=
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github.com/sony/gobreaker v1.0.0/go.mod h1:ZKptC7FHNvhBz7dN2LGjPVBz2sZJmc0/PkyDJOjmxWY=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
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github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
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github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
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golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
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golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
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golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
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golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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95
_examples/pubsubs/sql/main.go
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95
_examples/pubsubs/sql/main.go
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@@ -0,0 +1,95 @@
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// Sources for https://watermill.io/learn/getting-started/
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package main
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import (
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"context"
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stdSQL "database/sql"
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"log"
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"time"
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driver "github.com/go-sql-driver/mysql"
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"github.com/ThreeDotsLabs/watermill"
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"github.com/ThreeDotsLabs/watermill-sql/v4/pkg/sql"
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"github.com/ThreeDotsLabs/watermill/message"
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)
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func main() {
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db := createDB()
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logger := watermill.NewStdLogger(false, false)
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subscriber, err := sql.NewSubscriber(
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sql.BeginnerFromStdSQL(db),
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sql.SubscriberConfig{
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SchemaAdapter: sql.DefaultMySQLSchema{},
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OffsetsAdapter: sql.DefaultMySQLOffsetsAdapter{},
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InitializeSchema: true,
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},
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logger,
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)
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if err != nil {
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panic(err)
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}
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messages, err := subscriber.Subscribe(context.Background(), "example_topic")
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if err != nil {
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panic(err)
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}
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go process(messages)
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publisher, err := sql.NewPublisher(
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sql.BeginnerFromStdSQL(db),
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sql.PublisherConfig{
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SchemaAdapter: sql.DefaultMySQLSchema{},
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},
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logger,
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)
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if err != nil {
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panic(err)
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}
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publishMessages(publisher)
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}
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func createDB() *stdSQL.DB {
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conf := driver.NewConfig()
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conf.Net = "tcp"
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conf.User = "root"
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conf.Addr = "mysql"
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conf.DBName = "watermill"
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db, err := stdSQL.Open("mysql", conf.FormatDSN())
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if err != nil {
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panic(err)
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}
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err = db.Ping()
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if err != nil {
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panic(err)
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}
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return db
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}
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func publishMessages(publisher message.Publisher) {
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for {
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msg := message.NewMessage(watermill.NewUUID(), []byte(`{"message": "Hello, world!"}`))
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if err := publisher.Publish("example_topic", msg); err != nil {
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panic(err)
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}
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time.Sleep(time.Second)
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}
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}
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func process(messages <-chan *message.Message) {
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for msg := range messages {
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log.Printf("received message: %s, payload: %s", msg.UUID, string(msg.Payload))
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// we need to Acknowledge that we received and processed the message,
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// otherwise, it will be resent over and over again.
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msg.Ack()
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}
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}
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