Line data Source code
1 : #include "../../version.h"
2 :
3 : #include "../../../../disco/metrics/fd_prometheus.h"
4 : #include "../../../../ballet/http/fd_http_server.h"
5 : #include "../../../../util/net/fd_ip4.h"
6 :
7 : #include <sys/types.h>
8 : #include <sys/socket.h> /* SOCK_CLOEXEC, SOCK_NONBLOCK needed for seccomp filter */
9 : #include <unistd.h>
10 : #include <string.h>
11 :
12 : #if defined(__aarch64__)
13 : #include "generated/metric.arm64_seccomp.h"
14 : #else
15 : #include "generated/metric_seccomp.h"
16 : #endif
17 :
18 : #define FD_HTTP_SERVER_METRICS_MAX_CONNS 128
19 : #define FD_HTTP_SERVER_METRICS_MAX_REQUEST_LEN 8192
20 : #define FD_HTTP_SERVER_METRICS_OUTGOING_BUFFER_SZ (32UL<<20UL) /* 32MiB reserved for buffering metrics responses */
21 :
22 : const fd_http_server_params_t METRICS_PARAMS = {
23 : .max_connection_cnt = FD_HTTP_SERVER_METRICS_MAX_CONNS,
24 : .max_ws_connection_cnt = 0UL,
25 : .max_request_len = FD_HTTP_SERVER_METRICS_MAX_REQUEST_LEN,
26 : .max_ws_recv_frame_len = 0UL,
27 : .max_ws_send_frame_cnt = 0UL,
28 : .outgoing_buffer_sz = FD_HTTP_SERVER_METRICS_OUTGOING_BUFFER_SZ,
29 : };
30 :
31 : typedef struct {
32 : fd_topo_t * topo;
33 :
34 : fd_http_server_t * metrics_server;
35 : } fd_metric_ctx_t;
36 :
37 : FD_FN_CONST static inline ulong
38 3 : scratch_align( void ) {
39 3 : return 128UL;
40 3 : }
41 :
42 : FD_FN_PURE static inline ulong
43 3 : scratch_footprint( fd_topo_tile_t const * tile ) {
44 3 : (void)tile;
45 :
46 3 : ulong l = FD_LAYOUT_INIT;
47 3 : l = FD_LAYOUT_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
48 3 : l = FD_LAYOUT_APPEND( l, fd_http_server_align(), fd_http_server_footprint( METRICS_PARAMS ) );
49 3 : return FD_LAYOUT_FINI( l, scratch_align() );
50 3 : }
51 :
52 : static inline void
53 : before_credit( fd_metric_ctx_t * ctx,
54 : fd_stem_context_t * stem,
55 0 : int * charge_busy ) {
56 0 : (void)stem;
57 0 : *charge_busy = fd_http_server_poll( ctx->metrics_server, 1 ); /* 1ms */
58 0 : }
59 :
60 : static fd_http_server_response_t
61 0 : metrics_http_request( fd_http_server_request_t const * request ) {
62 0 : fd_metric_ctx_t * ctx = (fd_metric_ctx_t *)request->ctx;
63 :
64 0 : if( FD_UNLIKELY( request->method!=FD_HTTP_SERVER_METHOD_GET ) ) {
65 0 : return (fd_http_server_response_t){
66 0 : .status = 400,
67 0 : };
68 0 : }
69 :
70 0 : if( FD_LIKELY( !strcmp( request->path, "/metrics" ) ) ) {
71 0 : fd_prometheus_render_all( ctx->topo, ctx->metrics_server );
72 :
73 0 : fd_http_server_response_t response = {
74 0 : .status = 200,
75 0 : .content_type = "text/plain; version=0.0.4",
76 0 : };
77 0 : if( FD_UNLIKELY( fd_http_server_stage_body( ctx->metrics_server, &response ) ) ) {
78 0 : FD_LOG_WARNING(( "fd_http_server_stage_body failed, metrics response too long" ));
79 0 : return (fd_http_server_response_t){
80 0 : .status = 500,
81 0 : };
82 0 : }
83 0 : return response;
84 0 : } else {
85 0 : return (fd_http_server_response_t){
86 0 : .status = 404,
87 0 : };
88 0 : }
89 0 : }
90 :
91 : static void
92 : privileged_init( fd_topo_t * topo,
93 0 : fd_topo_tile_t * tile ) {
94 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
95 :
96 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
97 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
98 :
99 0 : fd_http_server_t * _metrics = FD_SCRATCH_ALLOC_APPEND( l, fd_http_server_align(), fd_http_server_footprint( METRICS_PARAMS ) );
100 :
101 0 : fd_http_server_callbacks_t metrics_callbacks = {
102 0 : .request = metrics_http_request,
103 0 : };
104 0 : ctx->metrics_server = fd_http_server_join( fd_http_server_new( _metrics, METRICS_PARAMS, metrics_callbacks, ctx ) );
105 0 : fd_http_server_listen( ctx->metrics_server, tile->metric.prometheus_listen_addr, tile->metric.prometheus_listen_port );
106 0 : }
107 :
108 : static void
109 : unprivileged_init( fd_topo_t * topo,
110 0 : fd_topo_tile_t * tile ) {
111 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
112 :
113 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
114 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
115 :
116 0 : ctx->topo = topo;
117 :
118 0 : ulong scratch_top = FD_SCRATCH_ALLOC_FINI( l, 1UL );
119 0 : if( FD_UNLIKELY( scratch_top > (ulong)scratch + scratch_footprint( tile ) ) )
120 0 : FD_LOG_ERR(( "scratch overflow %lu %lu %lu", scratch_top - (ulong)scratch - scratch_footprint( tile ), scratch_top, (ulong)scratch + scratch_footprint( tile ) ));
121 :
122 0 : FD_LOG_WARNING(( "Prometheus metrics endpoint listening at http://" FD_IP4_ADDR_FMT ":%u/metrics", FD_IP4_ADDR_FMT_ARGS( tile->metric.prometheus_listen_addr ), tile->metric.prometheus_listen_port ));
123 0 : }
124 :
125 : static ulong
126 : populate_allowed_seccomp( fd_topo_t const * topo,
127 : fd_topo_tile_t const * tile,
128 : ulong out_cnt,
129 0 : struct sock_filter * out ) {
130 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
131 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
132 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
133 :
134 0 : populate_sock_filter_policy_metric( out_cnt, out, (uint)fd_log_private_logfile_fd(), (uint)fd_http_server_fd( ctx->metrics_server ) );
135 0 : return sock_filter_policy_metric_instr_cnt;
136 0 : }
137 :
138 : static ulong
139 : populate_allowed_fds( fd_topo_t const * topo,
140 : fd_topo_tile_t const * tile,
141 : ulong out_fds_cnt,
142 0 : int * out_fds ) {
143 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
144 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
145 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
146 :
147 0 : if( FD_UNLIKELY( out_fds_cnt<3UL ) ) FD_LOG_ERR(( "out_fds_cnt %lu", out_fds_cnt ));
148 :
149 0 : ulong out_cnt = 0;
150 0 : out_fds[ out_cnt++ ] = 2; /* stderr */
151 0 : if( FD_LIKELY( -1!=fd_log_private_logfile_fd() ) )
152 0 : out_fds[ out_cnt++ ] = fd_log_private_logfile_fd(); /* logfile */
153 0 : out_fds[ out_cnt++ ] = fd_http_server_fd( ctx->metrics_server ); /* metrics listen socket */
154 0 : return out_cnt;
155 0 : }
156 :
157 0 : #define STEM_BURST (1UL)
158 0 : #define STEM_LAZY ((long)10e6) /* 10ms */
159 :
160 0 : #define STEM_CALLBACK_CONTEXT_TYPE fd_metric_ctx_t
161 0 : #define STEM_CALLBACK_CONTEXT_ALIGN alignof(fd_metric_ctx_t)
162 :
163 0 : #define STEM_CALLBACK_BEFORE_CREDIT before_credit
164 :
165 : #include "../../../../disco/stem/fd_stem.c"
166 :
167 : fd_topo_run_tile_t fd_tile_metric = {
168 : .name = "metric",
169 : .rlimit_file_cnt = FD_HTTP_SERVER_METRICS_MAX_CONNS+5UL, /* pipefd, socket, stderr, logfile, and one spare for new accept() connections */
170 : .populate_allowed_seccomp = populate_allowed_seccomp,
171 : .populate_allowed_fds = populate_allowed_fds,
172 : .scratch_align = scratch_align,
173 : .scratch_footprint = scratch_footprint,
174 : .privileged_init = privileged_init,
175 : .unprivileged_init = unprivileged_init,
176 : .run = stem_run,
177 : };
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