diff --git a/README.md b/README.md index 0e72074..b8bacd2 100644 --- a/README.md +++ b/README.md @@ -536,6 +536,30 @@ via the command line flag: ./build/mkp-server --enable-rate-limiting=false ``` +### OpenTelemetry + +MKP supports OpenTelemetry for distributed tracing and metrics. When enabled, +tool calls are instrumented with spans and metrics to help monitor and debug +your MCP server. + +Configuration is done via environment variables: + +- `MKP_OTEL_ENABLED`: Enable OpenTelemetry (default: false) +- `MKP_OTEL_SERVICE_NAME`: Service name for tracing (default: mkp) +- `MKP_OTEL_SERVICE_VERSION`: Service version (default: 0.1.0) +- `OTEL_EXPORTER_OTLP_ENDPOINT`: OTLP endpoint (e.g., localhost:4317) + +```bash +# Run with OpenTelemetry enabled, sending traces to a local collector +MKP_OTEL_ENABLED=true OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317 ./build/mkp-server +``` + +If no OTLP endpoint is configured, traces are printed to stdout for debugging. + +Metrics exported: +- `mkp.tool.requests`: Counter of tool requests (with tool name and error status) +- `mkp.tool.duration`: Histogram of tool request duration in milliseconds + ## Development ### Running tests diff --git a/go.mod b/go.mod index b1eb6c4..56bfe9d 100644 --- a/go.mod +++ b/go.mod @@ -5,6 +5,12 @@ go 1.24.2 require ( github.com/mark3labs/mcp-go v0.43.2 github.com/stretchr/testify v1.11.1 + go.opentelemetry.io/otel v1.39.0 + go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.39.0 + go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.39.0 + go.opentelemetry.io/otel/metric v1.39.0 + go.opentelemetry.io/otel/sdk v1.39.0 + go.opentelemetry.io/otel/trace v1.39.0 k8s.io/api v0.34.3 k8s.io/apimachinery v0.34.3 k8s.io/client-go v0.34.3 @@ -13,18 +19,21 @@ require ( require ( github.com/bahlo/generic-list-go v0.2.0 // indirect github.com/buger/jsonparser v1.1.1 // indirect + github.com/cenkalti/backoff/v5 v5.0.3 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect github.com/emicklei/go-restful/v3 v3.12.2 // indirect github.com/fxamacker/cbor/v2 v2.9.0 // indirect - github.com/go-logr/logr v1.4.2 // indirect + github.com/go-logr/logr v1.4.3 // indirect + github.com/go-logr/stdr v1.2.2 // indirect github.com/go-openapi/jsonpointer v0.21.0 // indirect github.com/go-openapi/jsonreference v0.20.2 // indirect github.com/go-openapi/swag v0.23.0 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/google/gnostic-models v0.7.0 // indirect - github.com/google/go-cmp v0.7.0 // indirect github.com/google/uuid v1.6.0 // indirect github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 // indirect + github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 // indirect github.com/invopop/jsonschema v0.13.0 // indirect github.com/josharian/intern v1.0.0 // indirect github.com/json-iterator/go v1.1.12 // indirect @@ -42,15 +51,21 @@ require ( github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect github.com/x448/float16 v0.8.4 // indirect github.com/yosida95/uritemplate/v3 v3.0.2 // indirect + go.opentelemetry.io/auto/sdk v1.2.1 // indirect + go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.39.0 // indirect + go.opentelemetry.io/proto/otlp v1.9.0 // indirect go.yaml.in/yaml/v2 v2.4.2 // indirect go.yaml.in/yaml/v3 v3.0.4 // indirect - golang.org/x/net v0.38.0 // indirect - golang.org/x/oauth2 v0.27.0 // indirect - golang.org/x/sys v0.31.0 // indirect - golang.org/x/term v0.30.0 // indirect - golang.org/x/text v0.23.0 // indirect + golang.org/x/net v0.47.0 // indirect + golang.org/x/oauth2 v0.32.0 // indirect + golang.org/x/sys v0.39.0 // indirect + golang.org/x/term v0.37.0 // indirect + golang.org/x/text v0.31.0 // indirect golang.org/x/time v0.9.0 // indirect - google.golang.org/protobuf v1.36.5 // indirect + google.golang.org/genproto/googleapis/api v0.0.0-20251202230838-ff82c1b0f217 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect + google.golang.org/grpc v1.77.0 // indirect + google.golang.org/protobuf v1.36.10 // indirect gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect gopkg.in/inf.v0 v0.9.1 // indirect gopkg.in/yaml.v3 v3.0.1 // indirect @@ -59,7 +74,6 @@ require ( k8s.io/utils v0.0.0-20250604170112-4c0f3b243397 // indirect sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8 // indirect sigs.k8s.io/randfill v1.0.0 // indirect - sigs.k8s.io/structured-merge-diff/v4 v4.6.0 // indirect sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect sigs.k8s.io/yaml v1.6.0 // indirect ) diff --git a/go.sum b/go.sum index 32e7cb7..b57e6e3 100644 --- a/go.sum +++ b/go.sum @@ -4,23 +4,26 @@ github.com/bahlo/generic-list-go v0.2.0 h1:5sz/EEAK+ls5wF+NeqDpk5+iNdMDXrh3z3nPn github.com/bahlo/generic-list-go v0.2.0/go.mod h1:2KvAjgMlE5NNynlg/5iLrrCCZ2+5xWbdbCW3pNTGyYg= github.com/buger/jsonparser v1.1.1 h1:2PnMjfWD7wBILjqQbt530v576A/cAbQvEW9gGIpYMUs= github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0= +github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM= +github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw= +github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs= +github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM= github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= -github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxERmMY4rD+g= -github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= github.com/emicklei/go-restful/v3 v3.12.2 h1:DhwDP0vY3k8ZzE0RunuJy8GhNpPL6zqLkDf9B/a0/xU= github.com/emicklei/go-restful/v3 v3.12.2/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8= github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0= -github.com/fxamacker/cbor/v2 v2.7.0 h1:iM5WgngdRBanHcxugY4JySA0nk1wZorNOpTgCMedv5E= -github.com/fxamacker/cbor/v2 v2.7.0/go.mod h1:pxXPTn3joSm21Gbwsv0w9OSA2y1HFR9qXEeXQVeNoDQ= github.com/fxamacker/cbor/v2 v2.9.0 h1:NpKPmjDBgUfBms6tr6JZkTHtfFGcMKsw3eGcmD/sapM= github.com/fxamacker/cbor/v2 v2.9.0/go.mod h1:vM4b+DJCtHn+zz7h3FFp/hDAI9WNWCsZj23V5ytsSxQ= -github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY= -github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= +github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI= +github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= +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/go-openapi/jsonpointer v0.19.6/go.mod h1:osyAmYz/mB/C3I+WsTTSgw1ONzaLJoLCyoi6/zppojs= github.com/go-openapi/jsonpointer v0.21.0 h1:YgdVicSA9vH5RiHs9TZW5oyafXZFc6+2Vc1rr/O9oNQ= github.com/go-openapi/jsonpointer v0.21.0/go.mod h1:IUyH9l/+uyhIYQ/PXVA41Rexl+kOkAPDdXEYns6fzUY= @@ -33,11 +36,10 @@ github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1v github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8= github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q= github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q= -github.com/google/gnostic-models v0.6.9 h1:MU/8wDLif2qCXZmzncUQ/BOfxWfthHi63KqpoNbWqVw= -github.com/google/gnostic-models v0.6.9/go.mod h1:CiWsm0s6BSQd1hRn8/QmxqB6BesYcbSZxsz9b0KuDBw= +github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek= +github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps= github.com/google/gnostic-models v0.7.0 h1:qwTtogB15McXDaNqTZdzPJRHvaVJlAl+HVQnLmJEJxo= github.com/google/gnostic-models v0.7.0/go.mod h1:whL5G0m6dmc5cPxKc5bdKdEN3UjI7OUGxBlw57miDrQ= -github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY= github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8= github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU= github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg= @@ -47,6 +49,8 @@ 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/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 h1:JeSE6pjso5THxAzdVpqr6/geYxZytqFMBCOtn/ujyeo= github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674/go.mod h1:r4w70xmWCQKmi1ONH4KIaBptdivuRPyosB9RmPlGEwA= +github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 h1:NmZ1PKzSTQbuGHw9DGPFomqkkLWMC+vZCkfs+FHv1Vg= +github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3/go.mod h1:zQrxl1YP88HQlA6i9c63DSVPFklWpGX4OWAc9bFuaH4= github.com/invopop/jsonschema v0.13.0 h1:KvpoAJWEjR3uD9Kbm2HWJmqsEaHt8lBUpd0qHcIi21E= github.com/invopop/jsonschema v0.13.0/go.mod h1:ffZ5Km5SWWRAIN6wbDXItl95euhFz2uON45H2qjYt+0= github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY= @@ -64,32 +68,6 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY= github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE= github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0= github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc= -github.com/mark3labs/mcp-go v0.33.0 h1:naxhjnTIs/tyPZmWUZFuG0lDmdA6sUyYGGf3gsHvTCc= -github.com/mark3labs/mcp-go v0.33.0/go.mod h1:rXqOudj/djTORU/ThxYx8fqEVj/5pvTuuebQ2RC7uk4= -github.com/mark3labs/mcp-go v0.34.0 h1:eWy7WBGvhk6EyAAyVzivTCprE52iXJwNtvHV6Cv3bR0= -github.com/mark3labs/mcp-go v0.34.0/go.mod h1:rXqOudj/djTORU/ThxYx8fqEVj/5pvTuuebQ2RC7uk4= -github.com/mark3labs/mcp-go v0.36.0 h1:rIZaijrRYPeSbJG8/qNDe0hWlGrCJ7FWHNMz2SQpTis= -github.com/mark3labs/mcp-go v0.36.0/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.37.0 h1:BywvZLPRT6Zx6mMG/MJfxLSZQkTGIcJSEGKsvr4DsoQ= -github.com/mark3labs/mcp-go v0.37.0/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.38.0 h1:E5tmJiIXkhwlV0pLAwAT0O5ZjUZSISE/2Jxg+6vpq4I= -github.com/mark3labs/mcp-go v0.38.0/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.39.0 h1:dQwaOADzUJ1ROslEJB8QV+4u/8XQCqH9ylB//x8cCEQ= -github.com/mark3labs/mcp-go v0.39.0/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.39.1 h1:2oPxk7aDbQhouakkYyKl2T4hKFU1c6FDaubWyGyVE1k= -github.com/mark3labs/mcp-go v0.39.1/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.40.0 h1:M0oqK412OHBKut9JwXSsj4KanSmEKpzoW8TcxoPOkAU= -github.com/mark3labs/mcp-go v0.40.0/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.41.0 h1:IFfJaovCet65F3av00bE1HzSnmHpMRWM1kz96R98I70= -github.com/mark3labs/mcp-go v0.41.0/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.41.1 h1:w78eWfiQam2i8ICL7AL0WFiq7KHNJQ6UB53ZVtH4KGA= -github.com/mark3labs/mcp-go v0.41.1/go.mod h1:T7tUa2jO6MavG+3P25Oy/jR7iCeJPHImCZHRymCn39g= -github.com/mark3labs/mcp-go v0.42.0 h1:gk/8nYJh8t3yroCAOBhNbYsM9TCKvkM13I5t5Hfu6Ls= -github.com/mark3labs/mcp-go v0.42.0/go.mod h1:YnJfOL382MIWDx1kMY+2zsRHU/q78dBg9aFb8W6Thdw= -github.com/mark3labs/mcp-go v0.43.0 h1:lgiKcWMddh4sngbU+hoWOZ9iAe/qp/m851RQpj3Y7jA= -github.com/mark3labs/mcp-go v0.43.0/go.mod h1:YnJfOL382MIWDx1kMY+2zsRHU/q78dBg9aFb8W6Thdw= -github.com/mark3labs/mcp-go v0.43.1 h1:WXNVd+bRM/7mOzCM9zulSwn/s9YEdAxbmeh9LoRHEXY= -github.com/mark3labs/mcp-go v0.43.1/go.mod h1:YnJfOL382MIWDx1kMY+2zsRHU/q78dBg9aFb8W6Thdw= github.com/mark3labs/mcp-go v0.43.2 h1:21PUSlWWiSbUPQwXIJ5WKlETixpFpq+WBpbMGDSVy/I= github.com/mark3labs/mcp-go v0.43.2/go.mod h1:YnJfOL382MIWDx1kMY+2zsRHU/q78dBg9aFb8W6Thdw= github.com/moby/spdystream v0.5.0 h1:7r0J1Si3QO/kjRitvSLVVFUjxMEb/YLj6S9FF62JBCU= @@ -97,7 +75,6 @@ github.com/moby/spdystream v0.5.0/go.mod h1:xBAYlnt/ay+11ShkdFKNAG7LsyK/tmNBVvVO github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q= github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg= github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q= -github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M= github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk= github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee h1:W5t00kpgFdJifH4BDsTlE89Zl93FEloxaWZfGcifgq8= github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk= @@ -114,12 +91,10 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U= github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= -github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII= 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e0adf13..c68209d 100644 --- a/pkg/mcp/server.go +++ b/pkg/mcp/server.go @@ -8,6 +8,7 @@ import ( "github.com/mark3labs/mcp-go/server" "github.com/StacklokLabs/mkp/pkg/k8s" + "github.com/StacklokLabs/mkp/pkg/otel" "github.com/StacklokLabs/mkp/pkg/ratelimit" ) @@ -27,20 +28,27 @@ type Config struct { // EnableRateLimiting determines whether to enable rate limiting for tool calls // When true, a default rate limiter will be used to prevent excessive API calls EnableRateLimiting bool + + // EnableOtel determines whether to enable OpenTelemetry tracing and metrics + // When true, tool calls will be instrumented with OpenTelemetry + EnableOtel bool } // DefaultConfig returns a Config with default values func DefaultConfig() *Config { + otelConfig := otel.DefaultConfig() return &Config{ - ServeResources: true, // Default to serving resources for backward compatibility - ReadWrite: false, // Default to read-only mode - EnableRateLimiting: true, // Default to enabling rate limiting + ServeResources: true, // Default to serving resources for backward compatibility + ReadWrite: false, // Default to read-only mode + EnableRateLimiting: true, // Default to enabling rate limiting + EnableOtel: otelConfig.Enabled, // Default based on MKP_OTEL_ENABLED env var } } // serverResources holds resources that need to be cleaned up when the server is stopped type serverResources struct { - rateLimiter *ratelimit.RateLimiter + rateLimiter *ratelimit.RateLimiter + otelProvider *otel.Provider } // Global variable to hold server resources @@ -52,6 +60,10 @@ func CreateServer(k8sClient *k8s.Client, config *Config) *server.MCPServer { if config == nil { config = DefaultConfig() } + + // Initialize server resources + resources = &serverResources{} + // Create MCP implementation impl := NewImplementation(k8sClient) @@ -63,20 +75,25 @@ func CreateServer(k8sClient *k8s.Client, config *Config) *server.MCPServer { server.WithRecovery(), } + // Add OpenTelemetry middleware if enabled + if config.EnableOtel { + log.Println("OpenTelemetry enabled, initializing provider") + otelConfig := otel.DefaultConfig() + provider, err := otel.NewProvider(context.Background(), otelConfig) + if err != nil { + log.Printf("Failed to initialize OpenTelemetry: %v", err) + } else { + resources.otelProvider = provider + options = append(options, server.WithToolHandlerMiddleware(otel.Middleware())) + } + } + // Add rate limiting middleware if enabled if config.EnableRateLimiting { log.Println("Server rate limiting enabled, initializing rate limiter") - // Create and store the rate limiter for cleanup limiter := ratelimit.GetDefaultRateLimiter() - - // Store the limiter for cleanup when the server is stopped - resources = &serverResources{ - rateLimiter: limiter, - } - - // Add the middleware to the server options - middleware := limiter.Middleware() - options = append(options, server.WithToolHandlerMiddleware(middleware)) + resources.rateLimiter = limiter + options = append(options, server.WithToolHandlerMiddleware(limiter.Middleware())) } // Create MCP server with all options @@ -132,11 +149,19 @@ func CreateServer(k8sClient *k8s.Client, config *Config) *server.MCPServer { // StopServer stops the MCP server and cleans up resources func StopServer() { - // Clean up resources - if resources != nil { - // Stop the rate limiter if it exists - if resources.rateLimiter != nil { - resources.rateLimiter.Stop() + if resources == nil { + return + } + + // Stop the rate limiter if it exists + if resources.rateLimiter != nil { + resources.rateLimiter.Stop() + } + + // Shutdown OpenTelemetry provider if it exists + if resources.otelProvider != nil { + if err := resources.otelProvider.Shutdown(context.Background()); err != nil { + log.Printf("Error shutting down OpenTelemetry: %v", err) } } } diff --git a/pkg/otel/config.go b/pkg/otel/config.go new file mode 100644 index 0000000..edb3b4b --- /dev/null +++ b/pkg/otel/config.go @@ -0,0 +1,43 @@ +// Package otel provides OpenTelemetry instrumentation for the MCP server +package otel + +import ( + "os" +) + +// Config holds the OpenTelemetry configuration +type Config struct { + // Enabled determines whether OpenTelemetry is enabled + Enabled bool + // ServiceName is the name of the service for tracing + ServiceName string + // ServiceVersion is the version of the service + ServiceVersion string + // OTLPEndpoint is the endpoint for the OTLP exporter (e.g., "localhost:4317") + // If empty, stdout exporter is used for debugging + OTLPEndpoint string +} + +// DefaultConfig returns the default OpenTelemetry configuration +func DefaultConfig() *Config { + return &Config{ + Enabled: getEnvBool("MKP_OTEL_ENABLED", false), + ServiceName: getEnvString("MKP_OTEL_SERVICE_NAME", "mkp"), + ServiceVersion: getEnvString("MKP_OTEL_SERVICE_VERSION", "0.1.0"), + OTLPEndpoint: getEnvString("OTEL_EXPORTER_OTLP_ENDPOINT", ""), + } +} + +func getEnvBool(key string, defaultValue bool) bool { + if value := os.Getenv(key); value != "" { + return value == "true" || value == "1" + } + return defaultValue +} + +func getEnvString(key string, defaultValue string) string { + if value := os.Getenv(key); value != "" { + return value + } + return defaultValue +} diff --git a/pkg/otel/config_test.go b/pkg/otel/config_test.go new file mode 100644 index 0000000..c9a2e38 --- /dev/null +++ b/pkg/otel/config_test.go @@ -0,0 +1,71 @@ +package otel + +import ( + "os" + "testing" + + "github.com/stretchr/testify/assert" +) + +func TestDefaultConfig(t *testing.T) { + config := DefaultConfig() + assert.NotNil(t, config) + assert.False(t, config.Enabled) + assert.Equal(t, "mkp", config.ServiceName) + assert.Equal(t, "0.1.0", config.ServiceVersion) + assert.Empty(t, config.OTLPEndpoint) +} + +func TestConfigFromEnv(t *testing.T) { + // Save original env values + origEnabled := os.Getenv("MKP_OTEL_ENABLED") + origName := os.Getenv("MKP_OTEL_SERVICE_NAME") + origVersion := os.Getenv("MKP_OTEL_SERVICE_VERSION") + origEndpoint := os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT") + defer func() { + os.Setenv("MKP_OTEL_ENABLED", origEnabled) + os.Setenv("MKP_OTEL_SERVICE_NAME", origName) + os.Setenv("MKP_OTEL_SERVICE_VERSION", origVersion) + os.Setenv("OTEL_EXPORTER_OTLP_ENDPOINT", origEndpoint) + }() + + // Set custom env values + os.Setenv("MKP_OTEL_ENABLED", "true") + os.Setenv("MKP_OTEL_SERVICE_NAME", "test-service") + os.Setenv("MKP_OTEL_SERVICE_VERSION", "1.0.0") + os.Setenv("OTEL_EXPORTER_OTLP_ENDPOINT", "localhost:4317") + + config := DefaultConfig() + assert.True(t, config.Enabled) + assert.Equal(t, "test-service", config.ServiceName) + assert.Equal(t, "1.0.0", config.ServiceVersion) + assert.Equal(t, "localhost:4317", config.OTLPEndpoint) +} + +func TestGetEnvBool(t *testing.T) { + tests := []struct { + name string + envValue string + expected bool + }{ + {"true", "true", true}, + {"1", "1", true}, + {"false", "false", false}, + {"0", "0", false}, + {"empty", "", false}, + {"invalid", "invalid", false}, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + key := "TEST_BOOL_" + tt.name + defer os.Unsetenv(key) + + if tt.envValue != "" { + os.Setenv(key, tt.envValue) + } + result := getEnvBool(key, false) + assert.Equal(t, tt.expected, result) + }) + } +} diff --git a/pkg/otel/middleware.go b/pkg/otel/middleware.go new file mode 100644 index 0000000..ef9f60c --- /dev/null +++ b/pkg/otel/middleware.go @@ -0,0 +1,71 @@ +package otel + +import ( + "context" + "time" + + "github.com/mark3labs/mcp-go/mcp" + "github.com/mark3labs/mcp-go/server" + "go.opentelemetry.io/otel" + "go.opentelemetry.io/otel/attribute" + "go.opentelemetry.io/otel/codes" + "go.opentelemetry.io/otel/metric" + "go.opentelemetry.io/otel/trace" +) + +const instrumentationName = "github.com/StacklokLabs/mkp/pkg/otel" + +// Middleware returns a tool handler middleware that adds OpenTelemetry tracing +func Middleware() server.ToolHandlerMiddleware { + tracer := otel.Tracer(instrumentationName) + meter := otel.Meter(instrumentationName) + + requestCounter, _ := meter.Int64Counter("mkp.tool.requests", + metric.WithDescription("Number of tool requests"), + metric.WithUnit("1"), + ) + + requestDuration, _ := meter.Float64Histogram("mkp.tool.duration", + metric.WithDescription("Duration of tool requests"), + metric.WithUnit("ms"), + ) + + return func(next server.ToolHandlerFunc) server.ToolHandlerFunc { + return func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) { + toolName := request.Params.Name + start := time.Now() + + ctx, span := tracer.Start(ctx, "tool."+toolName, + trace.WithSpanKind(trace.SpanKindServer), + trace.WithAttributes( + attribute.String("mcp.tool.name", toolName), + ), + ) + defer span.End() + + result, err := next(ctx, request) + + duration := float64(time.Since(start).Milliseconds()) + attrs := []attribute.KeyValue{ + attribute.String("tool", toolName), + } + + if err != nil { + span.SetStatus(codes.Error, err.Error()) + span.RecordError(err) + attrs = append(attrs, attribute.Bool("error", true)) + } else if result != nil && result.IsError { + span.SetStatus(codes.Error, "tool returned error") + attrs = append(attrs, attribute.Bool("error", true)) + } else { + span.SetStatus(codes.Ok, "") + attrs = append(attrs, attribute.Bool("error", false)) + } + + requestCounter.Add(ctx, 1, metric.WithAttributes(attrs...)) + requestDuration.Record(ctx, duration, metric.WithAttributes(attrs...)) + + return result, err + } + } +} diff --git a/pkg/otel/middleware_test.go b/pkg/otel/middleware_test.go new file mode 100644 index 0000000..c46cd37 --- /dev/null +++ b/pkg/otel/middleware_test.go @@ -0,0 +1,63 @@ +package otel + +import ( + "context" + "testing" + + "github.com/mark3labs/mcp-go/mcp" + "github.com/stretchr/testify/assert" +) + +func TestMiddleware(t *testing.T) { + middleware := Middleware() + assert.NotNil(t, middleware) + + // Create a mock handler + mockHandler := func(_ context.Context, _ mcp.CallToolRequest) (*mcp.CallToolResult, error) { + return mcp.NewToolResultText("success"), nil + } + + wrappedHandler := middleware(mockHandler) + assert.NotNil(t, wrappedHandler) + + request := mcp.CallToolRequest{ + Params: struct { + Name string `json:"name"` + Arguments any `json:"arguments,omitempty"` + Meta *mcp.Meta `json:"_meta,omitempty"` + }{ + Name: "test-tool", + }, + } + + result, err := wrappedHandler(context.Background(), request) + assert.NoError(t, err) + assert.NotNil(t, result) + assert.False(t, result.IsError) +} + +func TestMiddlewareWithError(t *testing.T) { + middleware := Middleware() + + // Create a handler that returns an error result + errorHandler := func(_ context.Context, _ mcp.CallToolRequest) (*mcp.CallToolResult, error) { + return mcp.NewToolResultError("test error"), nil + } + + wrappedHandler := middleware(errorHandler) + + request := mcp.CallToolRequest{ + Params: struct { + Name string `json:"name"` + Arguments any `json:"arguments,omitempty"` + Meta *mcp.Meta `json:"_meta,omitempty"` + }{ + Name: "test-tool", + }, + } + + result, err := wrappedHandler(context.Background(), request) + assert.NoError(t, err) + assert.NotNil(t, result) + assert.True(t, result.IsError) +} diff --git a/pkg/otel/provider.go b/pkg/otel/provider.go new file mode 100644 index 0000000..9fbe28a --- /dev/null +++ b/pkg/otel/provider.go @@ -0,0 +1,80 @@ +package otel + +import ( + "context" + "log" + "time" + + "go.opentelemetry.io/otel" + "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc" + "go.opentelemetry.io/otel/exporters/stdout/stdouttrace" + "go.opentelemetry.io/otel/propagation" + "go.opentelemetry.io/otel/sdk/resource" + sdktrace "go.opentelemetry.io/otel/sdk/trace" + semconv "go.opentelemetry.io/otel/semconv/v1.26.0" +) + +// Provider wraps the OpenTelemetry trace provider +type Provider struct { + tracerProvider *sdktrace.TracerProvider +} + +// NewProvider creates a new OpenTelemetry provider with the given configuration +func NewProvider(ctx context.Context, config *Config) (*Provider, error) { + if config == nil { + config = DefaultConfig() + } + + res, err := resource.New(ctx, + resource.WithAttributes( + semconv.ServiceName(config.ServiceName), + semconv.ServiceVersion(config.ServiceVersion), + ), + ) + if err != nil { + return nil, err + } + + var exporter sdktrace.SpanExporter + if config.OTLPEndpoint != "" { + exporter, err = otlptracegrpc.New(ctx, + otlptracegrpc.WithEndpoint(config.OTLPEndpoint), + otlptracegrpc.WithInsecure(), + ) + } else { + exporter, err = stdouttrace.New(stdouttrace.WithPrettyPrint()) + } + if err != nil { + return nil, err + } + + tp := sdktrace.NewTracerProvider( + sdktrace.WithBatcher(exporter), + sdktrace.WithResource(res), + sdktrace.WithSampler(sdktrace.AlwaysSample()), + ) + + otel.SetTracerProvider(tp) + otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator( + propagation.TraceContext{}, + propagation.Baggage{}, + )) + + return &Provider{tracerProvider: tp}, nil +} + +// Shutdown gracefully shuts down the provider +func (p *Provider) Shutdown(ctx context.Context) error { + if p.tracerProvider == nil { + return nil + } + + shutdownCtx, cancel := context.WithTimeout(ctx, 5*time.Second) + defer cancel() + + if err := p.tracerProvider.Shutdown(shutdownCtx); err != nil { + log.Printf("Error shutting down tracer provider: %v", err) + return err + } + return nil +}