Solution intended to intercept communication with external services in integration tests.
Predictable and isolated integration testing of application like in diagram is complicated.
In the following diagram HttpToGrpcMock is service hosted in docker compose with external.service.one and external.service.two names assigned to it. Edge services will have those URL's resolved to proxy service and no communication to external world will happen at this point.
Sequence diagram may explain better how everyting works:
Self signed certificates to show how proxy works with https have been added to repo. Steps 1 - 5 are described here for self reference only
New-SelfSignedCertificate -NotBefore (Get-Date) `
-NotAfter (Get-Date).AddYears(10) `
-Subject "second.example.com" `
-KeyAlgorithm "RSA" `
-KeyLength 2048 `
-HashAlgorithm "SHA256" `
-CertStoreLocation "cert:\CurrentUser\My" `
-KeyUsage KeyEncipherment `
-FriendlyName "second.example.com certificate for sample integration tests" `
-TextExtension @("2.5.29.19={critical}{text}","2.5.29.37={critical}{text}1.3.6.1.5.5.7.3.1","2.5.29.17={critical}{text}DNS=second.example.com")$password = ConvertTo-SecureString -String "1234" -Force -AsPlainText
Get-ChildItem -Path cert:\CurrentUser\My\< thumbprint > | Export-PfxCertificate -FilePath "< DockerComposeTests directory >\second.example.com.pfx" -Password $password$certificate = Get-ChildItem -Path "cert:\CurrentUser\My\< thumbprint >
$base64certificate = @"
-----BEGIN CERTIFICATE-----
$([Convert]::ToBase64String($certificate.Export('Cert'), [System.Base64FormattingOptions]::InsertLineBreaks))
-----END CERTIFICATE-----
"@
Set-Content -Path "< DockerComposeTests directory >\second.example.com.cer" -Value $base64certificateCOPY ./second.example.com.cer ./second.example.com.crt
RUN cat ./second.example.com.crt >> /etc/ssl/certs/ca-certificates.crt5. Pass .pfx (private and public) certificates to proxy container as shown in docker-compose.yml example
docker compose -f .\DockerComposeTests\docker-compose-services.yml -f .\DockerComposeTests\docker-compose-proxy.yml build
docker compose -f .\DockerComposeTests\docker-compose-services.yml -f .\DockerComposeTests\docker-compose-proxy.yml -d updocker build -o . -f ./DockerComposeTests/TestApp.Tests/Dockerfile --build-arg CACHEBUST=$(date) .Tests result xml file will be copied out of container into
./test_resultsfolder
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