Initial infrastructure for dealing with Kafka protocol in Go (#886)

.gitignore

@@ -73,3 +73,6 @@ test/oats/*/build/*
 test/cmd/grpc/client/grpclient
 test/integration/components/gohttp2/client/client
 test/integration/components/gohttp2/server/http2srv
+beyla.sln
+test/integration/components/gokafka/gokafka
+test/integration/components/gokafka/vendor

bpf/go_kafka.c

@@ -0,0 +1,155 @@
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "utils.h"
+#include "bpf_dbg.h"
+#include "go_common.h"
+#include "ringbuf.h"
+
+#define KAFKA_API_FETCH   0
+#define KAFKA_API_PRODUCE 1
+#define KAFKA_API_KEY_POS 5
+
+volatile const u64 sarama_broker_corr_id_pos;
+volatile const u64 sarama_response_corr_id_pos;
+volatile const u64 sarama_broker_conn_pos;
+volatile const u64 sarama_bufconn_conn_pos;
+
+struct {
+    __uint(type, BPF_MAP_TYPE_LRU_HASH);
+    __type(key, u32); // key: correlation id
+    __type(value, kafka_client_req_t);
+    __uint(max_entries, MAX_CONCURRENT_REQUESTS);
+} kafka_requests SEC(".maps");
+
+struct {
+    __uint(type, BPF_MAP_TYPE_LRU_HASH);
+    __type(key, void *); // key: goroutine id
+    __type(value, u32); // correlation id
+    __uint(max_entries, MAX_CONCURRENT_REQUESTS);
+} ongoing_kafka_requests SEC(".maps");
+
+SEC("uprobe/sarama_sendInternal")
+int uprobe_sarama_sendInternal(struct pt_regs *ctx) {
+    bpf_dbg_printk("=== uprobe/sarama_sendInternal === ");
+    void *goroutine_addr = GOROUTINE_PTR(ctx);
+    bpf_dbg_printk("goroutine_addr %lx", goroutine_addr);
+
+    u32 correlation_id = 0;
+
+    void *b_ptr = GO_PARAM1(ctx);
+    if (b_ptr) {
+        bpf_probe_read(&correlation_id, sizeof(u32), b_ptr + sarama_broker_corr_id_pos);
+    }
+
+    if (correlation_id) {
+        bpf_dbg_printk("correlation_id = %d", correlation_id);
+
+        if (bpf_map_update_elem(&ongoing_kafka_requests, &goroutine_addr, &correlation_id, BPF_ANY)) {
+            bpf_dbg_printk("can't update kafka requests element");
+        }
+    }
+
+    return 0;
+}
+
+SEC("uprobe/sarama_broker_write")
+int uprobe_sarama_broker_write(struct pt_regs *ctx) {
+    bpf_dbg_printk("=== uprobe/sarama_broker write === ");
+    void *goroutine_addr = GOROUTINE_PTR(ctx);
+    bpf_dbg_printk("goroutine_addr %lx", goroutine_addr);
+
+    u32 *invocation = bpf_map_lookup_elem(&ongoing_kafka_requests, &goroutine_addr);
+    void *b_ptr = GO_PARAM1(ctx);
+    void *buf_ptr = GO_PARAM2(ctx);
+
+    if (invocation) {
+        u8 small_buf[8];
+        bpf_probe_read(small_buf, 8, buf_ptr);
+        // the api key is 2 bytes, but num APIs at the moment is max 50.
+        // instead of reading 2 bytes and then doing ntohs, we just read
+        // the second byte of the api key, assuming the first is 0.
+        u8 api_key = small_buf[KAFKA_API_KEY_POS];
+
+        bpf_dbg_printk("api_key = %d", api_key);
+
+        // We only care about fetch and produce
+        if (api_key == KAFKA_API_FETCH || api_key == KAFKA_API_PRODUCE) {
+            u32 correlation_id = *invocation;
+            kafka_client_req_t req = {
+                .type = EVENT_GO_KAFKA,
+                .start_monotime_ns = bpf_ktime_get_ns(),
+            };
+
+            void *conn_conn_ptr = (void *)(b_ptr + sarama_broker_conn_pos);
+            bpf_dbg_printk("conn conn ptr %llx", conn_conn_ptr);
+            if (conn_conn_ptr) {
+                void *tcp_conn_ptr = 0;
+                bpf_probe_read(&tcp_conn_ptr, sizeof(tcp_conn_ptr), (void *)(conn_conn_ptr + sarama_bufconn_conn_pos + 8)); // find conn
+                bpf_dbg_printk("tcp conn ptr %llx", tcp_conn_ptr);
+                if (tcp_conn_ptr) {
+                    void *conn_ptr = 0;
+                    bpf_probe_read(&conn_ptr, sizeof(conn_ptr), (void *)(tcp_conn_ptr + 8)); // find conn
+                    bpf_dbg_printk("conn ptr %llx", conn_ptr);
+                    if (conn_ptr) {
+                        get_conn_info(conn_ptr, &req.conn);
+                    }
+                }
+            }
+
+            bpf_dbg_printk("correlation_id = %d", correlation_id);
+
+            bpf_probe_read(req.buf, KAFKA_MAX_LEN, buf_ptr);
+            bpf_map_update_elem(&kafka_requests, &correlation_id, &req, BPF_ANY);
+        }
+
+    }
+
+    bpf_map_delete_elem(&ongoing_kafka_requests, &goroutine_addr);
+
+    return 0;
+}
+
+SEC("uprobe/sarama_response_promise_handle")
+int uprobe_sarama_response_promise_handle(struct pt_regs *ctx) {
+    bpf_dbg_printk("=== uprobe/sarama_response_promise_handle === ");
+
+    void *p = GO_PARAM1(ctx);
+
+    if (p) {
+        u32 correlation_id = 0;
+
+        bpf_probe_read(&correlation_id, sizeof(u32), p + sarama_response_corr_id_pos);
+
+        bpf_dbg_printk("correlation_id = %d", correlation_id);
+
+        if (correlation_id) {
+            kafka_client_req_t *req = bpf_map_lookup_elem(&kafka_requests, &correlation_id);
+
+            if (req) {
+                req->end_monotime_ns = bpf_ktime_get_ns();
+
+                kafka_client_req_t *trace = bpf_ringbuf_reserve(&events, sizeof(kafka_client_req_t), 0);        
+                if (trace) {
+                    bpf_dbg_printk("Sending kafka client go trace");
+
+                    __builtin_memcpy(trace, req, sizeof(kafka_client_req_t));
+                    bpf_ringbuf_submit(trace, get_flags());
+                }
+            }
+
+            bpf_map_delete_elem(&kafka_requests, &correlation_id);
+        }
+    }
+
+    return 0;
+}

bpf/http_sock.h

@@ -593,7 +593,7 @@ static __always_inline void handle_buf_with_connection(pid_connection_info_t *pi
 
         bpf_dbg_printk("=== http_buffer_event len=%d pid=%d still_reading=%d ===", bytes_len, pid_from_pid_tgid(bpf_get_current_pid_tgid()), still_reading(info));
 
-        if (packet_type == PACKET_TYPE_REQUEST && (info->status == 0)) {    
+        if (packet_type == PACKET_TYPE_REQUEST && (info->status == 0)) {
             http_connection_metadata_t *meta = connection_meta(pid_conn, direction, PACKET_TYPE_REQUEST);
 
             get_or_create_trace_info(meta, pid_conn->pid, &pid_conn->conn, u_buf, bytes_len, capture_header_buffer);

bpf/http_trace.c

@@ -16,3 +16,4 @@
 const http_request_trace *unused_4 __attribute__((unused));
 const sql_request_trace *unused_3 __attribute__((unused));
 const tcp_req_t *unused_5 __attribute__((unused));
+const kafka_client_req_t *unused_6 __attribute__((unused));

bpf/http_trace.h

@@ -23,6 +23,7 @@
 #define HOST_LEN 64 // can be a fully qualified DNS name
 #define TRACEPARENT_LEN 55
 #define SQL_MAX_LEN 500
+#define KAFKA_MAX_LEN 256
 
 // Trace of an HTTP call invocation. It is instantiated by the return uprobe and forwarded to the
 // user space through the events ringbuffer.
@@ -52,4 +53,12 @@ typedef struct sql_request_trace_t {
     pid_info pid;
 } __attribute__((packed)) sql_request_trace;
 
+typedef struct kafka_client_req {
+    u8  type;                           // Must be first
+    u64 start_monotime_ns;
+    u64 end_monotime_ns;
+    u8  buf[KAFKA_MAX_LEN];
+    connection_info_t conn __attribute__ ((aligned (8)));
+} __attribute__((packed)) kafka_client_req_t;
+
 #endif //HTTP_TRACE_H

bpf/ringbuf.h

@@ -13,6 +13,7 @@
 #define EVENT_K_HTTP_REQUEST   6
 #define EVENT_K_HTTP2_REQUEST  7
 #define EVENT_TCP_REQUEST      8
+#define EVENT_GO_KAFKA         9
 
 // setting here the following map definitions without pinning them to a global namespace
 // would lead that services running both HTTP and GRPC server would duplicate 

configs/offsets/sarama/go.mod

@@ -0,0 +1,26 @@
+module sarama_off
+
+go 1.22.2
+
+require github.com/IBM/sarama v1.43.2
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/eapache/go-resiliency v1.6.0 // indirect
+	github.com/eapache/go-xerial-snappy v0.0.0-20230731223053-c322873962e3 // indirect
+	github.com/eapache/queue v1.1.0 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/hashicorp/go-uuid v1.0.3 // indirect
+	github.com/jcmturner/aescts/v2 v2.0.0 // indirect
+	github.com/jcmturner/dnsutils/v2 v2.0.0 // indirect
+	github.com/jcmturner/gofork v1.7.6 // indirect
+	github.com/jcmturner/gokrb5/v8 v8.4.4 // indirect
+	github.com/jcmturner/rpc/v2 v2.0.3 // indirect
+	github.com/klauspost/compress v1.17.8 // indirect
+	github.com/pierrec/lz4/v4 v4.1.21 // indirect
+	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect
+	golang.org/x/crypto v0.22.0 // indirect
+	golang.org/x/net v0.24.0 // indirect
+)

configs/offsets/sarama/go.sum

@@ -0,0 +1,94 @@
+github.com/IBM/sarama v1.43.2 h1:HABeEqRUh32z8yzY2hGB/j8mHSzC/HA9zlEjqFNCzSw=
+github.com/IBM/sarama v1.43.2/go.mod h1:Kyo4WkF24Z+1nz7xeVUFWIuKVV8RS3wM8mkvPKMdXFQ=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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+github.com/eapache/go-resiliency v1.6.0 h1:CqGDTLtpwuWKn6Nj3uNUdflaq+/kIPsg0gfNzHton30=
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+github.com/eapache/go-xerial-snappy v0.0.0-20230731223053-c322873962e3/go.mod h1:YvSRo5mw33fLEx1+DlK6L2VV43tJt5Eyel9n9XBcR+0=
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