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Add support for tracking Redis client calls for non-Go programs (#891)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| package ebpfcommon | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "strings" | ||
|
|
||
| trace2 "go.opentelemetry.io/otel/trace" | ||
|
|
||
| "github.com/grafana/beyla/pkg/internal/request" | ||
| ) | ||
|
|
||
| const minRedisFrameLen = 3 | ||
|
|
||
| func isRedis(buf []uint8) bool { | ||
| if len(buf) < minRedisFrameLen { | ||
| return false | ||
| } | ||
|
|
||
| return isRedisOp(buf) | ||
| } | ||
|
|
||
| // nolint:cyclop | ||
| func isRedisOp(buf []uint8) bool { | ||
| if len(buf) == 0 { | ||
| return false | ||
| } | ||
| c := buf[0] | ||
|
|
||
| switch c { | ||
| case '+': | ||
| return crlfTerminatedMatch(buf[1:], func(c uint8) bool { | ||
| return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == ' ' || c == '-' || c == '_' | ||
| }) | ||
| case '-': | ||
| return isRedisError(buf[1:]) | ||
| case ':', '$', '*': | ||
| return crlfTerminatedMatch(buf[1:], func(c uint8) bool { | ||
| return (c >= '0' && c <= '9') | ||
| }) | ||
| } | ||
|
|
||
| return false | ||
| } | ||
|
|
||
| func isRedisError(buf []uint8) bool { | ||
| return bytes.HasPrefix(buf, []byte("ERR ")) || | ||
| bytes.HasPrefix(buf, []byte("WRONGTYPE ")) || | ||
| bytes.HasPrefix(buf, []byte("MOVED ")) || | ||
| bytes.HasPrefix(buf, []byte("ASK ")) || | ||
| bytes.HasPrefix(buf, []byte("BUSY ")) || | ||
| bytes.HasPrefix(buf, []byte("NOSCRIPT ")) || | ||
| bytes.HasPrefix(buf, []byte("CLUSTERDOWN ")) | ||
| } | ||
|
|
||
| func crlfTerminatedMatch(buf []uint8, matches func(c uint8) bool) bool { | ||
| cr := false | ||
| i := 0 | ||
| for ; i < len(buf); i++ { | ||
| c := buf[i] | ||
| if matches(c) { | ||
| continue | ||
| } | ||
| if c == '\r' { | ||
| cr = true | ||
| break | ||
| } | ||
|
|
||
| return false | ||
| } | ||
|
|
||
| if !cr || i >= len(buf)-1 { | ||
| return false | ||
| } | ||
|
|
||
| return buf[i+1] == '\n' | ||
| } | ||
|
|
||
| func parseRedisRequest(buf string) (string, string, bool) { | ||
| lines := strings.Split(buf, "\r\n") | ||
|
|
||
| if len(lines) < 2 { | ||
| return "", "", false | ||
| } | ||
|
|
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| // It's not a command, something else? | ||
| if lines[0][0] != '*' { | ||
| return "", "", true | ||
| } | ||
|
|
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| op := "" | ||
| text := "" | ||
|
|
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| read := false | ||
| // Skip the first line | ||
| for _, l := range lines[1:] { | ||
| if len(l) == 0 { | ||
| continue | ||
| } | ||
| if !read { | ||
| if isRedisOp([]uint8(l + "\r\n")) { | ||
| read = true | ||
| } else { | ||
| break | ||
| } | ||
| } else { | ||
| if op == "" { | ||
| op = l | ||
| } | ||
| text += l + " " | ||
| read = false | ||
| } | ||
| } | ||
|
|
||
| return op, text, true | ||
| } | ||
|
|
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| func TCPToRedisToSpan(trace *TCPRequestInfo, op, text string, status int) request.Span { | ||
| peer := "" | ||
| hostname := "" | ||
| hostPort := 0 | ||
|
|
||
| if trace.ConnInfo.S_port != 0 || trace.ConnInfo.D_port != 0 { | ||
| peer, hostname = trace.reqHostInfo() | ||
| hostPort = int(trace.ConnInfo.D_port) | ||
| } | ||
|
|
||
| return request.Span{ | ||
| Type: request.EventTypeRedisClient, | ||
| Method: op, | ||
| Path: text, | ||
| Peer: peer, | ||
| Host: hostname, | ||
| HostPort: hostPort, | ||
| ContentLength: 0, | ||
| RequestStart: int64(trace.StartMonotimeNs), | ||
| Start: int64(trace.StartMonotimeNs), | ||
| End: int64(trace.EndMonotimeNs), | ||
| Status: status, | ||
| TraceID: trace2.TraceID(trace.Tp.TraceId), | ||
| SpanID: trace2.SpanID(trace.Tp.SpanId), | ||
| ParentSpanID: trace2.SpanID(trace.Tp.ParentId), | ||
| Flags: trace.Tp.Flags, | ||
| Pid: request.PidInfo{ | ||
| HostPID: trace.Pid.HostPid, | ||
| UserPID: trace.Pid.UserPid, | ||
| Namespace: trace.Pid.Ns, | ||
| }, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| package ebpfcommon | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| type crlfTest struct { | ||
| testStr string | ||
| result bool | ||
| } | ||
|
|
||
| func TestCRLFMatching(t *testing.T) { | ||
| for _, ts := range []crlfTest{ | ||
| {testStr: "Not a sql or any known protocol", result: false}, | ||
| {testStr: "Not a sql or any known protocol\r\n", result: true}, | ||
| {testStr: "123\r\n", result: false}, | ||
| {testStr: "\r\n", result: true}, | ||
| {testStr: "\n", result: false}, | ||
| {testStr: "\r", result: false}, | ||
| {testStr: "", result: false}, | ||
| } { | ||
| res := crlfTerminatedMatch([]uint8(ts.testStr), func(c uint8) bool { | ||
| return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == ' ' || c == '-' || c == '_' | ||
| }) | ||
| assert.Equal(t, res, ts.result) | ||
| } | ||
| } |
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