From f3e32ed100d428a44448e14f05b1e62649aa76b7 Mon Sep 17 00:00:00 2001 From: Scott Garman Date: Thu, 8 Feb 2024 16:04:32 -0800 Subject: [PATCH] Log metadata diffs on upserts Before performing an upsert, log the differences between the existing metadata and the new metadata. This will help us understand what is happening when we see unexpected changes in the metadata. --- go.mod | 2 +- go.sum | 33 +------------- pkg/api/v1/router_instance_metadata.go | 63 ++++++++++++++++++++++++++ 3 files changed, 66 insertions(+), 32 deletions(-) diff --git a/go.mod b/go.mod index 8ff2cac0..456dbfde 100644 --- a/go.mod +++ b/go.mod @@ -95,7 +95,7 @@ require ( github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect github.com/modern-go/reflect2 v1.0.2 // indirect github.com/pelletier/go-toml/v2 v2.1.0 // indirect - github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect + github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 github.com/pressly/goose/v3 v3.15.0 // indirect github.com/prometheus/client_model v0.5.0 // indirect github.com/prometheus/common v0.45.0 // indirect diff --git a/go.sum b/go.sum index 37a301cc..325ffa72 100644 --- a/go.sum +++ b/go.sum @@ -120,8 +120,6 @@ github.com/cncf/xds/go v0.0.0-20211001041855-01bcc9b48dfe/go.mod h1:eXthEFrGJvWH github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= github.com/cockroachdb/apd v1.1.0 h1:3LFP3629v+1aKXU5Q37mxmRxX/pIu1nijXydLShEq5I= github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ= -github.com/cockroachdb/cockroach-go/v2 v2.3.5 h1:Khtm8K6fTTz/ZCWPzU9Ne3aOW9VyAnj4qIPCJgKtwK0= -github.com/cockroachdb/cockroach-go/v2 v2.3.5/go.mod h1:1wNJ45eSXW9AnOc3skntW9ZUZz6gxrQK3cOj3rK+BC8= github.com/cockroachdb/cockroach-go/v2 v2.3.6 h1:Wlv9TzkrG9V7i6u8dEtmXPrBzvfFp+CgJNs696rAajM= github.com/cockroachdb/cockroach-go/v2 v2.3.6/go.mod h1:1wNJ45eSXW9AnOc3skntW9ZUZz6gxrQK3cOj3rK+BC8= github.com/coreos/go-oidc/v3 v3.9.0 h1:0J/ogVOd4y8P0f0xUh8l9t07xRP/d8tccvjHl2dcsSo= @@ -203,8 +201,6 @@ github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY= github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY= github.com/go-playground/validator/v10 v10.2.0/go.mod h1:uOYAAleCW8F/7oMFd6aG0GOhaH6EGOAJShg8Id5JGkI= -github.com/go-playground/validator/v10 v10.16.0 h1:x+plE831WK4vaKHO/jpgUGsvLKIqRRkz6M78GuJAfGE= -github.com/go-playground/validator/v10 v10.16.0/go.mod h1:9iXMNT7sEkjXb0I+enO7QXmzG6QCsPWY4zveKFVRSyU= github.com/go-playground/validator/v10 v10.17.0 h1:SmVVlfAOtlZncTxRuinDPomC2DkXJ4E5T9gDA0AIH74= github.com/go-playground/validator/v10 v10.17.0/go.mod h1:9iXMNT7sEkjXb0I+enO7QXmzG6QCsPWY4zveKFVRSyU= github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg= @@ -306,8 +302,6 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= -github.com/google/uuid v1.5.0 h1:1p67kYwdtXjb0gL0BPiP1Av9wiZPo5A8z2cWkTZ+eyU= -github.com/google/uuid v1.5.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0= github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg= @@ -648,12 +642,9 @@ github.com/volatiletech/null/v8 v8.1.2 h1:kiTiX1PpwvuugKwfvUNX/SU/5A2KGZMXfGD0DU github.com/volatiletech/null/v8 v8.1.2/go.mod h1:98DbwNoKEpRrYtGjWFctievIfm4n4MxG0A6EBUcoS5g= github.com/volatiletech/randomize v0.0.1 h1:eE5yajattWqTB2/eN8df4dw+8jwAzBtbdo5sbWC4nMk= github.com/volatiletech/randomize v0.0.1/go.mod h1:GN3U0QYqfZ9FOJ67bzax1cqZ5q2xuj2mXrXBjWaRTlY= -github.com/volatiletech/sqlboiler/v4 v4.15.0 h1:+twm3mA34SaUF6wB9U6QkXxkK8AKkV5EfgMSvcKWeY4= -github.com/volatiletech/sqlboiler/v4 v4.15.0/go.mod h1:s643wqYyCQ7Ak2hMVxH7kTS0+lFPNlj+gHKUIukJ0YA= github.com/volatiletech/sqlboiler/v4 v4.16.1 h1:utSd0n+zoasYAGOwbeGzzLb3p9vdItRyYR6zm20SVP0= github.com/volatiletech/sqlboiler/v4 v4.16.1/go.mod h1:B14BPBGTrJ2X6l7lwnvV/iXgYR48+ozGSlzHI3frl6U= github.com/volatiletech/strmangle v0.0.1/go.mod h1:F6RA6IkB5vq0yTG4GQ0UsbbRcl3ni9P76i+JrTBKFFg= -github.com/volatiletech/strmangle v0.0.5/go.mod h1:ycDvbDkjDvhC0NUU8w3fWwl5JEMTV56vTKXzR3GeR+0= github.com/volatiletech/strmangle v0.0.6 h1:AdOYE3B2ygRDq4rXDij/MMwq6KVK/pWAYxpC7CLrkKQ= github.com/volatiletech/strmangle v0.0.6/go.mod h1:ycDvbDkjDvhC0NUU8w3fWwl5JEMTV56vTKXzR3GeR+0= github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= @@ -680,16 +671,10 @@ go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= 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/github.com/gin-gonic/gin/otelgin v0.45.0 h1:0KYeVr81ogcVRLXVcXFuPQMNZngplnP8MqrE8CqvHeg= -go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.45.0/go.mod h1:ro3eEFOynMu0p59YVUFFbkOeaPREbqc5yDR2HnGpFc0= -go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.46.1 h1:mMv2jG58h6ZI5t5S9QCVGdzCmAsTakMa3oxVgpSD44g= -go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.46.1/go.mod h1:oqRuNKG0upTaDPbLVCG8AD0G2ETrfDtmh7jViy7ox6M= go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.48.0 h1:9fRyGkm/rbLuNNJsk9YY2c7Tpjf9tRjm1BAa48L3ypU= go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.48.0/go.mod h1:7eRxLMX2ua+Pwtw1lkj8L0i0aykVQ/CafXhARYY056k= -go.opentelemetry.io/contrib/propagators/b3 v1.20.0 h1:Yty9Vs4F3D6/liF1o6FNt0PvN85h/BJJ6DQKJ3nrcM0= -go.opentelemetry.io/contrib/propagators/b3 v1.20.0/go.mod h1:On4VgbkqYL18kbJlWsa18+cMNe6rYpBnPi1ARI/BrsU= -go.opentelemetry.io/otel v1.21.0 h1:hzLeKBZEL7Okw2mGzZ0cc4k/A7Fta0uoPgaJCr8fsFc= -go.opentelemetry.io/otel v1.21.0/go.mod h1:QZzNPQPm1zLX4gZK4cMi+71eaorMSGT3A4znnUvNNEo= +go.opentelemetry.io/contrib/propagators/b3 v1.23.0 h1:aaIGWc5JdfRGpCafLRxMJbD65MfTa206AwSKkvGS0Hg= +go.opentelemetry.io/contrib/propagators/b3 v1.23.0/go.mod h1:Gyz7V7XghvwTq+mIhLFlTgcc03UDroOg8vezs4NLhwU= go.opentelemetry.io/otel v1.23.1 h1:Za4UzOqJYS+MUczKI320AtqZHZb7EqxO00jAHE0jmQY= go.opentelemetry.io/otel v1.23.1/go.mod h1:Td0134eafDLcTS4y+zQ26GE8u3dEuRBiBCTUIRHaikA= go.opentelemetry.io/otel/exporters/jaeger v1.17.0 h1:D7UpUy2Xc2wsi1Ras6V40q806WM07rqoCWzXu7Sqy+4= @@ -702,16 +687,12 @@ go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.21.0 h1:digkE go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.21.0/go.mod h1:/OpE/y70qVkndM0TrxT4KBoN3RsFZP0QaofcfYrj76I= go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0 h1:VhlEQAPp9R1ktYfrPk5SOryw1e9LDDTZCbIPFrho0ec= go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0/go.mod h1:kB3ufRbfU+CQ4MlUcqtW8Z7YEOBeK2DJ6CmR5rYYF3E= -go.opentelemetry.io/otel/metric v1.21.0 h1:tlYWfeo+Bocx5kLEloTjbcDwBuELRrIFxwdQ36PlJu4= -go.opentelemetry.io/otel/metric v1.21.0/go.mod h1:o1p3CA8nNHW8j5yuQLdc1eeqEaPfzug24uvsyIEJRWM= go.opentelemetry.io/otel/metric v1.23.1 h1:PQJmqJ9u2QaJLBOELl1cxIdPcpbwzbkjfEyelTl2rlo= go.opentelemetry.io/otel/metric v1.23.1/go.mod h1:mpG2QPlAfnK8yNhNJAxDZruU9Y1/HubbC+KyH8FaCWI= go.opentelemetry.io/otel/sdk v1.21.0 h1:FTt8qirL1EysG6sTQRZ5TokkU8d0ugCj8htOgThZXQ8= go.opentelemetry.io/otel/sdk v1.21.0/go.mod h1:Nna6Yv7PWTdgJHVRD9hIYywQBRx7pbox6nwBnZIxl/E= go.opentelemetry.io/otel/sdk/metric v0.39.0 h1:Kun8i1eYf48kHH83RucG93ffz0zGV1sh46FAScOTuDI= go.opentelemetry.io/otel/sdk/metric v0.39.0/go.mod h1:piDIRgjcK7u0HCL5pCA4e74qpK/jk3NiUoAHATVAmiI= -go.opentelemetry.io/otel/trace v1.21.0 h1:WD9i5gzvoUPuXIXH24ZNBudiarZDKuekPqi/E8fpfLc= -go.opentelemetry.io/otel/trace v1.21.0/go.mod h1:LGbsEB0f9LGjN+OZaQQ26sohbOmiMR+BaslueVtS/qQ= go.opentelemetry.io/otel/trace v1.23.1 h1:4LrmmEd8AU2rFvU1zegmvqW7+kWarxtNOPyeL6HmYY8= go.opentelemetry.io/otel/trace v1.23.1/go.mod h1:4IpnpJFwr1mo/6HL8XIPJaE9y0+u1KcVmuW7dwFSVrI= go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI= @@ -764,8 +745,6 @@ golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4/go.mod h1:IxCIyHEi3zRg3s0 golang.org/x/crypto v0.0.0-20220511200225-c6db032c6c88/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4= golang.org/x/crypto v0.0.0-20220826181053-bd7e27e6170d/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4= golang.org/x/crypto v0.6.0/go.mod h1:OFC/31mSvZgRz0V1QTNCzfAI1aIRzbiufJtkMIlEp58= -golang.org/x/crypto v0.17.0 h1:r8bRNjWL3GshPW3gkd+RpvzWrZAwPS49OmTGZ/uhM4k= -golang.org/x/crypto v0.17.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4= golang.org/x/crypto v0.19.0 h1:ENy+Az/9Y1vSrlrvBSyna3PITt4tiZLf7sgCjZBX7Wo= golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU= golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= @@ -859,8 +838,6 @@ golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4/go.mod h1:CfG3xpIq0wQ8r1q4Su golang.org/x/net v0.0.0-20220520000938-2e3eb7b945c2/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk= golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c= golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs= -golang.org/x/net v0.19.0 h1:zTwKpTd2XuCqf8huc7Fo2iSy+4RHPd10s4KzeTnVr1c= -golang.org/x/net v0.19.0/go.mod h1:CfAk/cbD4CthTvqiEl8NpboMuiuOYsAr/7NOjZJtv1U= golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4= golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44= golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U= @@ -883,8 +860,6 @@ golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8/go.mod h1:KelEdhl1UZF7XfJ golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b/go.mod h1:DAh4E804XQdzx2j+YRIaUnCqCV2RuMz24cGBJ5QYIrc= golang.org/x/oauth2 v0.0.0-20220309155454-6242fa91716a/go.mod h1:DAh4E804XQdzx2j+YRIaUnCqCV2RuMz24cGBJ5QYIrc= golang.org/x/oauth2 v0.0.0-20220411215720-9780585627b5/go.mod h1:DAh4E804XQdzx2j+YRIaUnCqCV2RuMz24cGBJ5QYIrc= -golang.org/x/oauth2 v0.15.0 h1:s8pnnxNVzjWyrvYdFUQq5llS1PX2zhPXmccZv99h7uQ= -golang.org/x/oauth2 v0.15.0/go.mod h1:q48ptWNTY5XWf+JNten23lcvHpLJ0ZSxF5ttTHKVCAM= golang.org/x/oauth2 v0.17.0 h1:6m3ZPmLEFdVxKKWnKq4VqZ60gutO35zm+zrAHVmHyDQ= golang.org/x/oauth2 v0.17.0/go.mod h1:OzPDGQiuQMguemayvdylqddI7qcD9lnSDb+1FiwQ5HA= golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= @@ -988,8 +963,6 @@ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBc golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= -golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc= -golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y= golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw= @@ -1266,8 +1239,6 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc= google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc= google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I= -google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8= -google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I= google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I= google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos= gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= diff --git a/pkg/api/v1/router_instance_metadata.go b/pkg/api/v1/router_instance_metadata.go index 9d8ecddc..3720415d 100644 --- a/pkg/api/v1/router_instance_metadata.go +++ b/pkg/api/v1/router_instance_metadata.go @@ -5,12 +5,16 @@ import ( "database/sql" "encoding/json" "errors" + "fmt" + "log" "math/rand" "net/http" + "reflect" "strconv" "time" "github.com/gin-gonic/gin" + "github.com/pmezard/go-difflib/difflib" "github.com/spf13/viper" "github.com/volatiletech/null/v8" "github.com/volatiletech/sqlboiler/v4/types" @@ -267,6 +271,9 @@ func (r *Router) instanceMetadataSet(c *gin.Context) { Metadata: types.JSON(params.Metadata), } + // Log the difference between the metadata we're about to upsert and the metadata we have in the database + instanceMetadataLogDiffs(r, c, newInstanceMetadata) + err := upserter.UpsertMetadata(c, r.DB, r.Logger, params.ID, params.getIPAddresses(), newInstanceMetadata) if err != nil { dbErrorResponse(r.Logger, c, err) @@ -275,6 +282,62 @@ func (r *Router) instanceMetadataSet(c *gin.Context) { c.Status(http.StatusOK) } +// Log the difference between the metadata we're about to upsert and the metadata we have in the database +func instanceMetadataLogDiffs(r *Router, c *gin.Context, newInstanceMetadata *models.InstanceMetadatum) { + instanceID := newInstanceMetadata.ID + + existingMetadata, err := models.FindInstanceMetadatum(c.Request.Context(), r.DB, instanceID) + if err != nil && !errors.Is(err, sql.ErrNoRows) { + r.Logger.Sugar().Info("Upsert metadata diff for instance ", instanceID, ": this is the first metadata for this instance") + return + } + + if existingMetadata != nil { + r.Logger.Sugar().Info("Upsert metadata diff for instance ", instanceID, ": ", diffJSON(existingMetadata.Metadata, newInstanceMetadata.Metadata)) + } +} + +// diffJSON returns a string representation of the difference between two JSON objects +func diffJSON(existingJSON, newJSON types.JSON) string { + var existingMap map[string]interface{} + + var newMap map[string]interface{} + + err := existingJSON.Unmarshal(&existingMap) + if err != nil { + return "Error unmarshalling existing JSON" + } + + err = newJSON.Unmarshal(&newMap) + if err != nil { + return "Error unmarshalling new JSON" + } + + return diffMap(existingMap, newMap) +} + +// diffMap returns a string representation of the difference between two maps +func diffMap(existingMap, newMap map[string]interface{}) string { + var diff difflib.UnifiedDiff + + if reflect.DeepEqual(existingMap, newMap) { + return "No difference" + } + + // Generate a unified diff between the two maps + diff = difflib.UnifiedDiff{ + A: difflib.SplitLines(fmt.Sprintf("%#v", existingMap)), + B: difflib.SplitLines(fmt.Sprintf("%#v", newMap)), + } + + diffText, err := difflib.GetUnifiedDiffString(diff) + if err != nil { + log.Fatal(err) + } + + return diffText +} + func (r *Router) instanceUserdataSet(c *gin.Context) { params := UpsertUserdataRequest{}