├── .gitignore ├── .vscode └── launch.json ├── LICENSE ├── Makefile ├── README.md ├── cmd └── main.go ├── go.mod ├── go.sum └── server ├── connection.go └── proxy_server.go /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, built with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | 14 | # Dependency directories (remove the comment below to include it) 15 | # vendor/ 16 | 17 | bin/ -------------------------------------------------------------------------------- /.vscode/launch.json: -------------------------------------------------------------------------------- 1 | { 2 | // Use IntelliSense to learn about possible attributes. 3 | // Hover to view descriptions of existing attributes. 4 | // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 5 | "version": "0.2.0", 6 | "configurations": [ 7 | { 8 | "name": "Launch Package", 9 | "type": "go", 10 | "request": "launch", 11 | "mode": "auto", 12 | "program": "cmd/main.go", 13 | "args": [ 14 | "--listen=:5432", 15 | "--primary=postgresql://postgres:password@localhost:5441/postgres", 16 | "--mirror=postgresql://postgres:password@localhost:5442/postgres" 17 | ] 18 | } 19 | ] 20 | } 21 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2023 Kelly Sommers 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | all: deps build 2 | 3 | deps: 4 | go get -d ./... 5 | 6 | build: 7 | go build -o bin/frenzy ./cmd -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ``` 2 | _____ 3 | _/ ____\______ ____ ____ ___________.__. 4 | \ __\\_ __ \_/ __ \ / \\___ < | | 5 | | | | | \/\ ___/| | \/ / \___ | 6 | |__| |__| \___ >___| /_____ \/ ____| 7 | \/ \/ \/\/ 8 | ``` 9 | 10 | A Postgres wire protocol aware mirroring proxy. 11 | 12 | # Getting started 13 | Frenzy is an experimental Postgres mirroring proxy that allows mirroring production traffic to shadow instances. Frenzy allows you to service production traffic from a `primary` while measuring one or more `mirror` shadow instances. 14 | 15 | Frenzy takes 1 `primary` connection string that will be used to respond to production requests and multiple `mirror` connection strings that will receive the duplicated traffic from the primary. 16 | 17 | # Building 18 | To compile the `bin/frenzy` binary run the following. 19 | ``` 20 | make 21 | ``` 22 | 23 | # Using 24 | Provide 1 primary Postgres connection string and one or many mirror Postgres connection strings. 25 | ``` 26 | ./bin/frenzy --listen :5432 \ 27 | --primary postgresql://postgres:password@localhost:5441/postgres \ 28 | --mirror postgresql://postgres:password@localhost:5442/postgres 29 | ``` 30 | 31 | # Supported Queries 32 | Right now I am testing with a simple hello world query. 33 | ``` 34 | PGPASSWORD=password psql -U postgres -h localhost -p 5432 -c "SELECT version();" 35 | ``` 36 | Surprisingly I've seen more complicated queries work already! `\l` in the `psql` console also dispatches a more complicated query that seems to work! 37 | -------------------------------------------------------------------------------- /cmd/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "fmt" 6 | "log" 7 | "os" 8 | "strconv" 9 | 10 | "github.com/akamensky/argparse" 11 | "github.com/kellabyte/frenzy/server" 12 | "go.uber.org/zap" 13 | "go.uber.org/zap/zapcore" 14 | ) 15 | 16 | func main() { 17 | logger, err := configureLogger() 18 | if err != nil { 19 | log.Fatal(err) 20 | } 21 | defer logger.Sync() 22 | 23 | parser := argparse.NewParser("print", "Frenzy Mirroring Postgres Proxy") 24 | listenAddress := parser.String("l", "listen", &argparse.Options{Required: true, Help: "Listening port."}) 25 | primaryAddress := parser.String("p", "primary", &argparse.Options{Required: true, Help: "Primary Postgres connection string."}) 26 | var mirrorsAddresses *[]string = parser.StringList("m", "mirror", &argparse.Options{Required: true, Help: "Mirror Postgres connection string."}) 27 | 28 | // Parse input 29 | err = parser.Parse(os.Args) 30 | if err != nil { 31 | // In case of error print error and print usage 32 | // This can also be done by passing -h or --help flags 33 | fmt.Print(parser.Usage(err)) 34 | fmt.Printf("EXAMPLE\nfrenzy --listen :5432 --primary postgresql://postgres:password@localhost:5441/postgres --mirror postgresql://postgres:password@localhost:5442/postgres") 35 | os.Exit(1) 36 | } 37 | 38 | mirrors := *mirrorsAddresses 39 | logFields := make([]zapcore.Field, 0) 40 | logFields = append(logFields, zap.String("listen", *listenAddress)) 41 | logFields = append(logFields, zap.String("primary", *primaryAddress)) 42 | for index, mirror := range mirrors { 43 | field := zapcore.Field{ 44 | Key: "mirror-" + strconv.Itoa((index + 1)), 45 | Type: zapcore.StringType, 46 | String: mirror, 47 | } 48 | logFields = append(logFields, field) 49 | } 50 | 51 | logger.Info("frenzy starting up", logFields...) 52 | 53 | server := server.NewProxyServer(logger) 54 | server.ListenAndServe(context.Background(), *listenAddress, *primaryAddress, *mirrorsAddresses) 55 | defer server.Close(context.Background()) 56 | } 57 | 58 | func configureLogger() (*zap.Logger, error) { 59 | config := zap.NewDevelopmentConfig() 60 | config.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder 61 | logger, err := config.Build() 62 | return logger.Named("frenzy"), err 63 | } 64 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/kellabyte/frenzy 2 | 3 | go 1.20 4 | 5 | require ( 6 | github.com/akamensky/argparse v1.4.0 7 | github.com/jackc/pgx/v5 v5.3.1 8 | github.com/jeroenrinzema/psql-wire v0.5.3 9 | github.com/lib/pq v1.10.7 10 | go.uber.org/zap v1.19.1 11 | ) 12 | 13 | require ( 14 | github.com/jackc/pgio v1.0.0 // indirect 15 | github.com/jackc/pgpassfile v1.0.0 // indirect 16 | github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect 17 | github.com/jackc/pgtype v1.8.1 // indirect 18 | go.uber.org/atomic v1.7.0 // indirect 19 | go.uber.org/multierr v1.6.0 // indirect 20 | golang.org/x/crypto v0.6.0 // indirect 21 | golang.org/x/text v0.7.0 // indirect 22 | ) 23 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 2 | github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs= 3 | github.com/akamensky/argparse v1.4.0 h1:YGzvsTqCvbEZhL8zZu2AiA5nq805NZh75JNj4ajn1xc= 4 | github.com/akamensky/argparse v1.4.0/go.mod h1:S5kwC7IuDcEr5VeXtGPRVZ5o/FdhcMlQz4IZQuw64xA= 5 | github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA= 6 | github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ= 7 | github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= 8 | github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= 9 | github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY= 10 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 11 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 12 | github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY= 13 | github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A= 14 | github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= 15 | github.com/gofrs/uuid v4.0.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM= 16 | github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI= 17 | github.com/jackc/chunkreader v1.0.0/go.mod h1:RT6O25fNZIuasFJRyZ4R/Y2BbhasbmZXF9QQ7T3kePo= 18 | github.com/jackc/chunkreader/v2 v2.0.0/go.mod h1:odVSm741yZoC3dpHEUXIqA9tQRhFrgOHwnPIn9lDKlk= 19 | github.com/jackc/chunkreader/v2 v2.0.1/go.mod h1:odVSm741yZoC3dpHEUXIqA9tQRhFrgOHwnPIn9lDKlk= 20 | github.com/jackc/pgconn v0.0.0-20190420214824-7e0022ef6ba3/go.mod h1:jkELnwuX+w9qN5YIfX0fl88Ehu4XC3keFuOJJk9pcnA= 21 | github.com/jackc/pgconn v0.0.0-20190824142844-760dd75542eb/go.mod h1:lLjNuW/+OfW9/pnVKPazfWOgNfH2aPem8YQ7ilXGvJE= 22 | github.com/jackc/pgconn v0.0.0-20190831204454-2fabfa3c18b7/go.mod h1:ZJKsE/KZfsUgOEh9hBm+xYTstcNHg7UPMVJqRfQxq4s= 23 | github.com/jackc/pgconn v1.8.0/go.mod h1:1C2Pb36bGIP9QHGBYCjnyhqu7Rv3sGshaQUvmfGIB/o= 24 | github.com/jackc/pgconn v1.9.0/go.mod h1:YctiPyvzfU11JFxoXokUOOKQXQmDMoJL9vJzHH8/2JY= 25 | github.com/jackc/pgconn v1.9.1-0.20210724152538-d89c8390a530/go.mod h1:4z2w8XhRbP1hYxkpTuBjTS3ne3J48K83+u0zoyvg2pI= 26 | github.com/jackc/pgio v1.0.0 h1:g12B9UwVnzGhueNavwioyEEpAmqMe1E/BN9ES+8ovkE= 27 | github.com/jackc/pgio v1.0.0/go.mod h1:oP+2QK2wFfUWgr+gxjoBH9KGBb31Eio69xUb0w5bYf8= 28 | github.com/jackc/pgmock v0.0.0-20190831213851-13a1b77aafa2/go.mod h1:fGZlG77KXmcq05nJLRkk0+p82V8B8Dw8KN2/V9c/OAE= 29 | github.com/jackc/pgmock v0.0.0-20201204152224-4fe30f7445fd/go.mod h1:hrBW0Enj2AZTNpt/7Y5rr2xe/9Mn757Wtb2xeBzPv2c= 30 | github.com/jackc/pgmock v0.0.0-20210724152146-4ad1a8207f65/go.mod h1:5R2h2EEX+qri8jOWMbJCtaPWkrrNc7OHwsp2TCqp7ak= 31 | github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM= 32 | github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg= 33 | github.com/jackc/pgproto3 v1.1.0/go.mod h1:eR5FA3leWg7p9aeAqi37XOTgTIbkABlvcPB3E5rlc78= 34 | github.com/jackc/pgproto3/v2 v2.0.0-alpha1.0.20190420180111-c116219b62db/go.mod h1:bhq50y+xrl9n5mRYyCBFKkpRVTLYJVWeCc+mEAI3yXA= 35 | github.com/jackc/pgproto3/v2 v2.0.0-alpha1.0.20190609003834-432c2951c711/go.mod h1:uH0AWtUmuShn0bcesswc4aBTWGvw0cAxIJp+6OB//Wg= 36 | github.com/jackc/pgproto3/v2 v2.0.0-rc3/go.mod h1:ryONWYqW6dqSg1Lw6vXNMXoBJhpzvWKnT95C46ckYeM= 37 | github.com/jackc/pgproto3/v2 v2.0.0-rc3.0.20190831210041-4c03ce451f29/go.mod h1:ryONWYqW6dqSg1Lw6vXNMXoBJhpzvWKnT95C46ckYeM= 38 | github.com/jackc/pgproto3/v2 v2.0.6/go.mod h1:WfJCnwN3HIg9Ish/j3sgWXnAfK8A9Y0bwXYU5xKaEdA= 39 | github.com/jackc/pgproto3/v2 v2.1.1/go.mod h1:WfJCnwN3HIg9Ish/j3sgWXnAfK8A9Y0bwXYU5xKaEdA= 40 | github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b/go.mod h1:vsD4gTJCa9TptPL8sPkXrLZ+hDuNrZCnj29CQpr4X1E= 41 | github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a h1:bbPeKD0xmW/Y25WS6cokEszi5g+S0QxI/d45PkRi7Nk= 42 | github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM= 43 | github.com/jackc/pgtype v0.0.0-20190421001408-4ed0de4755e0/go.mod h1:hdSHsc1V01CGwFsrv11mJRHWJ6aifDLfdV3aVjFF0zg= 44 | github.com/jackc/pgtype v0.0.0-20190824184912-ab885b375b90/go.mod h1:KcahbBH1nCMSo2DXpzsoWOAfFkdEtEJpPbVLq8eE+mc= 45 | github.com/jackc/pgtype v0.0.0-20190828014616-a8802b16cc59/go.mod h1:MWlu30kVJrUS8lot6TQqcg7mtthZ9T0EoIBFiJcmcyw= 46 | github.com/jackc/pgtype v1.8.1-0.20210724151600-32e20a603178/go.mod h1:C516IlIV9NKqfsMCXTdChteoXmwgUceqaLfjg2e3NlM= 47 | github.com/jackc/pgtype v1.8.1 h1:9k0IXtdJXHJbyAWQgbWr1lU+MEhPXZz6RIXxfR5oxXs= 48 | github.com/jackc/pgtype v1.8.1/go.mod h1:LUMuVrfsFfdKGLw+AFFVv6KtHOFMwRgDDzBt76IqCA4= 49 | github.com/jackc/pgx/v4 v4.0.0-20190420224344-cc3461e65d96/go.mod h1:mdxmSJJuR08CZQyj1PVQBHy9XOp5p8/SHH6a0psbY9Y= 50 | github.com/jackc/pgx/v4 v4.0.0-20190421002000-1b8f0016e912/go.mod h1:no/Y67Jkk/9WuGR0JG/JseM9irFbnEPbuWV2EELPNuM= 51 | github.com/jackc/pgx/v4 v4.0.0-pre1.0.20190824185557-6972a5742186/go.mod h1:X+GQnOEnf1dqHGpw7JmHqHc1NxDoalibchSk9/RWuDc= 52 | github.com/jackc/pgx/v4 v4.12.1-0.20210724153913-640aa07df17c/go.mod h1:1QD0+tgSXP7iUjYm9C1NxKhny7lq6ee99u/z+IHFcgs= 53 | github.com/jackc/pgx/v5 v5.3.1 h1:Fcr8QJ1ZeLi5zsPZqQeUZhNhxfkkKBOgJuYkJHoBOtU= 54 | github.com/jackc/pgx/v5 v5.3.1/go.mod h1:t3JDKnCBlYIc0ewLF0Q7B8MXmoIaBOZj/ic7iHozM/8= 55 | github.com/jackc/puddle v0.0.0-20190413234325-e4ced69a3a2b/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk= 56 | github.com/jackc/puddle v0.0.0-20190608224051-11cab39313c9/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk= 57 | github.com/jackc/puddle v1.1.3/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk= 58 | github.com/jeroenrinzema/psql-wire v0.5.3 h1:+UsK+wDp/mY+d3uZZhHFjr3rYUTsMYGTgy1Duj7Cn30= 59 | github.com/jeroenrinzema/psql-wire v0.5.3/go.mod h1:rqSKPsX6J5i3ZLxIjKQ9S1QmE/WAu0Nvm+ALiL2GhnU= 60 | github.com/kisielk/gotool v1.0.0/go.mod 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github.com/rs/zerolog v1.13.0/go.mod h1:YbFCdg8HfsridGWAh22vktObvhZbQsZXe4/zB0OKkWU= 83 | github.com/rs/zerolog v1.15.0/go.mod h1:xYTKnLHcpfU2225ny5qZjxnj9NvkumZYjJHlAThCjNc= 84 | github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0= 85 | github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4= 86 | github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o= 87 | github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q= 88 | github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE= 89 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 90 | github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 91 | github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE= 92 | github.com/stretchr/testify v1.2.2/go.mod 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h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw= 104 | go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc= 105 | go.uber.org/goleak v1.1.11-0.20210813005559-691160354723/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ= 106 | go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0= 107 | go.uber.org/multierr v1.3.0/go.mod h1:VgVr7evmIr6uPjLBxg28wmKNXyqE9akIJ5XnfpiKl+4= 108 | go.uber.org/multierr v1.5.0/go.mod h1:FeouvMocqHpRaaGuG9EjoKcStLC43Zu/fmqdUMPcKYU= 109 | go.uber.org/multierr v1.6.0 h1:y6IPFStTAIT5Ytl7/XYmHvzXQ7S3g/IeZW9hyZ5thw4= 110 | go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU= 111 | go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA= 112 | go.uber.org/zap v1.9.1/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q= 113 | go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q= 114 | go.uber.org/zap 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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 134 | golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 135 | golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 136 | golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg= 137 | golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM= 138 | golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 139 | golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 140 | golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 141 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod 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-------------------------------------------------------------------------------- /server/connection.go: -------------------------------------------------------------------------------- 1 | package server 2 | 3 | import ( 4 | "context" 5 | "os" 6 | "strings" 7 | 8 | "github.com/jackc/pgx/v5" 9 | wire "github.com/jeroenrinzema/psql-wire" 10 | "github.com/lib/pq/oid" 11 | "go.uber.org/zap" 12 | ) 13 | 14 | type ConnectionType int 15 | 16 | const ( 17 | Primary ConnectionType = iota 18 | Mirror 19 | ) 20 | 21 | type Connection struct { 22 | logger *zap.Logger 23 | name string 24 | host string 25 | conn *pgx.Conn 26 | pgServerVersion string 27 | connectionType ConnectionType 28 | } 29 | 30 | func NewConnection(logger *zap.Logger, connectionType ConnectionType, name string) *Connection { 31 | return &Connection{ 32 | logger: logger, 33 | connectionType: connectionType, 34 | name: name, 35 | } 36 | } 37 | 38 | func (connection *Connection) Connect( 39 | ctx context.Context, 40 | hostAddress string) error { 41 | 42 | connection.host = hostAddress 43 | conn, err := pgx.Connect(ctx, connection.host) 44 | if err != nil { 45 | connection.logger.Error( 46 | "failed to connect to postgres", 47 | zap.String("address", connection.host), 48 | zap.Error(err)) 49 | 50 | os.Exit(1) 51 | } 52 | connection.conn = conn 53 | connection.pgServerVersion, err = connection.getPostgresVersion(ctx) 54 | if err != nil { 55 | connection.logger.Error( 56 | "could not detect Postgres server_version_num", 57 | zap.Error(err)) 58 | } 59 | 60 | if connection.connectionType == Primary { 61 | connection.logger.Info( 62 | "connected", 63 | zap.String("address", connection.host)) 64 | 65 | if strings.TrimSpace(connection.pgServerVersion) == "" { 66 | connection.pgServerVersion = "150002" 67 | 68 | connection.logger.Error( 69 | "Could not detect primary server_version_num using default instead", 70 | zap.String("server_version_num", connection.pgServerVersion), 71 | zap.Error(err)) 72 | } 73 | connection.logger.Info( 74 | "Detected and adopting primary server_version_num", 75 | zap.String("server_version_num", connection.pgServerVersion)) 76 | 77 | } else if connection.connectionType == Mirror { 78 | connection.logger.Info( 79 | "Connected to mirror", 80 | zap.String("address", connection.host)) 81 | } 82 | return nil 83 | } 84 | 85 | func (connection *Connection) getPostgresVersion(ctx context.Context) (string, error) { 86 | rows := connection.conn.QueryRow(ctx, "SELECT current_setting('server_version_num');") 87 | 88 | var pgServerVersion string 89 | err := rows.Scan(&pgServerVersion) 90 | if err != nil { 91 | return "", err 92 | } 93 | return pgServerVersion, nil 94 | } 95 | 96 | func (connection *Connection) Close(ctx context.Context) error { 97 | return connection.conn.Close(ctx) 98 | } 99 | 100 | func (connection *Connection) ExecuteQuery( 101 | ctx context.Context, 102 | query string, 103 | writer wire.DataWriter) error { 104 | 105 | if connection.connectionType == Primary { 106 | return connection.executePrimaryQuery(ctx, query, writer) 107 | } else if connection.connectionType == Mirror { 108 | return connection.executeMirrorQuery(ctx, query) 109 | } 110 | return nil 111 | } 112 | 113 | func (connection *Connection) executePrimaryQuery( 114 | ctx context.Context, 115 | query string, 116 | writer wire.DataWriter) error { 117 | 118 | rows, err := connection.conn.Query(ctx, query) 119 | if err != nil { 120 | connection.logger.Error( 121 | "Could not execute query on primary", 122 | zap.String("address", connection.host), 123 | zap.String("query", query), 124 | zap.Error(err)) 125 | return err 126 | } 127 | 128 | table := wire.Columns{} 129 | 130 | // Add the columns. 131 | for _, field := range rows.FieldDescriptions() { 132 | dataTypeOID := oid.Oid(field.DataTypeOID) 133 | dataTypeName := oid.TypeName[dataTypeOID] 134 | connection.logger.Debug( 135 | "column read", 136 | zap.String("column", field.Name), 137 | zap.String("type", dataTypeName)) 138 | 139 | // No idea what to do here. I suspect this is where I need to add support 140 | // for proxying various data types correctly and not treat everything as Text. 141 | column := wire.Column{ 142 | Table: 0, 143 | Name: field.Name, 144 | Oid: dataTypeOID, 145 | // Width: 146 | Format: wire.TextFormat, 147 | } 148 | table = append(table, column) 149 | } 150 | err = writer.Define(table) 151 | if err != nil { 152 | return err 153 | } 154 | 155 | // Loop each row. 156 | for rows.Next() { 157 | values, err := rows.Values() 158 | if err != nil { 159 | return err 160 | } 161 | writer.Row(values) 162 | } 163 | err = writer.Complete("OK") 164 | if err != nil { 165 | return err 166 | } 167 | return nil 168 | } 169 | 170 | func (connection *Connection) executeMirrorQuery( 171 | ctx context.Context, 172 | query string) error { 173 | 174 | rows, err := connection.conn.Query(context.Background(), query) 175 | if err != nil { 176 | connection.logger.Error( 177 | "Could not execute query on mirror", 178 | zap.String("address", connection.host), 179 | zap.String("query", query), 180 | zap.Error(err)) 181 | 182 | return err 183 | } 184 | defer rows.Close() 185 | return nil 186 | } 187 | -------------------------------------------------------------------------------- /server/proxy_server.go: -------------------------------------------------------------------------------- 1 | package server 2 | 3 | import ( 4 | "context" 5 | "log" 6 | "strconv" 7 | 8 | wire "github.com/jeroenrinzema/psql-wire" 9 | "go.uber.org/zap" 10 | ) 11 | 12 | type ProxyServer struct { 13 | logger *zap.Logger 14 | primary *Connection 15 | mirrors []*Connection 16 | } 17 | 18 | func NewProxyServer(logger *zap.Logger) *ProxyServer { 19 | return &ProxyServer{ 20 | logger: logger, 21 | } 22 | } 23 | 24 | func (server *ProxyServer) ListenAndServe( 25 | ctx context.Context, 26 | listenAddress string, 27 | primaryAddress string, 28 | mirrorAddresses []string) error { 29 | 30 | primaryName := "primary" 31 | primaryConnection := NewConnection(server.logger.Named(primaryName), Primary, primaryName) 32 | err := primaryConnection.Connect(ctx, primaryAddress) 33 | if err != nil { 34 | return err 35 | } 36 | server.primary = primaryConnection 37 | 38 | err = server.connectToMirrors(ctx, mirrorAddresses) 39 | if err != nil { 40 | return err 41 | } 42 | 43 | var postgresListener *wire.Server 44 | postgresListener, err = wire.NewServer(wire.SimpleQuery(server.handle), wire.Logger(server.logger)) 45 | if err != nil { 46 | return err 47 | } 48 | server.adoptPostgresVersion(postgresListener) 49 | postgresListener.ListenAndServe(listenAddress) 50 | return nil 51 | } 52 | 53 | func (server *ProxyServer) adoptPostgresVersion(postgresListener *wire.Server) { 54 | // We adopt and announce as the same version as the Primary. 55 | postgresListener.Version = server.primary.pgServerVersion 56 | } 57 | 58 | func (server *ProxyServer) connectToMirrors( 59 | ctx context.Context, 60 | mirrorAddresses []string) error { 61 | 62 | for index, mirrorAddress := range mirrorAddresses { 63 | name := "mirror-" + strconv.Itoa(index+1) 64 | connection := NewConnection(server.logger.Named(name), Mirror, name) 65 | err := connection.Connect(ctx, mirrorAddress) 66 | if err != nil { 67 | return err 68 | } 69 | server.mirrors = append(server.mirrors, connection) 70 | } 71 | return nil 72 | } 73 | 74 | func (server *ProxyServer) Close(ctx context.Context) error { 75 | for _, mirror := range server.mirrors { 76 | err := mirror.Close(ctx) 77 | if err != nil { 78 | log.Printf("Failed to close mirror %s", err) 79 | return err 80 | } 81 | } 82 | return nil 83 | } 84 | 85 | func (server *ProxyServer) handle( 86 | ctx context.Context, 87 | query string, 88 | writer wire.DataWriter, 89 | parameters []string) error { 90 | 91 | log.Println("QUERY:", query) 92 | 93 | err := server.primary.ExecuteQuery(ctx, query, writer) 94 | if err != nil { 95 | return err 96 | } 97 | for _, mirror := range server.mirrors { 98 | mirror.ExecuteQuery(ctx, query, writer) 99 | } 100 | return err 101 | } 102 | --------------------------------------------------------------------------------