Line data Source code
1 : #include "fd_prometheus.h"
2 : #include "fd_metrics.h"
3 : #include "../waker/fd_waker.h"
4 : #include "../../waltz/http/fd_http_server_private.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 <time.h> /* CLOCK_REALTIME for seccomp filter */
10 : #include <unistd.h>
11 : #include <string.h>
12 :
13 : #include <linux/futex.h>
14 : #include "generated/fd_metric_tile_seccomp.h"
15 :
16 : #define FD_HTTP_SERVER_METRICS_MAX_CONNS 128
17 : #define FD_HTTP_SERVER_METRICS_MAX_REQUEST_LEN 8192
18 : #define FD_HTTP_SERVER_METRICS_OUTGOING_BUFFER_SZ (32UL<<20UL) /* 32MiB reserved for buffering metrics responses */
19 :
20 : const fd_http_server_params_t METRICS_PARAMS = {
21 : .max_connection_cnt = FD_HTTP_SERVER_METRICS_MAX_CONNS,
22 : .max_ws_connection_cnt = 0UL,
23 : .max_request_len = FD_HTTP_SERVER_METRICS_MAX_REQUEST_LEN,
24 : .max_ws_recv_frame_len = 0UL,
25 : .max_ws_send_frame_cnt = 0UL,
26 : .outgoing_buffer_sz = FD_HTTP_SERVER_METRICS_OUTGOING_BUFFER_SZ,
27 : };
28 :
29 : typedef struct {
30 : fd_topo_t const * topo;
31 :
32 : fd_http_server_t * metrics_server;
33 :
34 : ulong waker_client_idx;
35 : ulong * waker_fseq;
36 :
37 : long boot_ts;
38 : } fd_metric_ctx_t;
39 :
40 : FD_FN_CONST static inline ulong
41 0 : scratch_align( void ) {
42 0 : return 128UL;
43 0 : }
44 :
45 : FD_FN_PURE static inline ulong
46 0 : scratch_footprint( fd_topo_tile_t const * tile ) {
47 0 : (void)tile;
48 :
49 0 : ulong l = FD_LAYOUT_INIT;
50 0 : l = FD_LAYOUT_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
51 0 : l = FD_LAYOUT_APPEND( l, fd_http_server_align(), fd_http_server_footprint( METRICS_PARAMS ) );
52 0 : return FD_LAYOUT_FINI( l, scratch_align() );
53 0 : }
54 :
55 : static inline void
56 : before_credit( fd_metric_ctx_t * ctx,
57 : fd_stem_context_t * stem,
58 0 : int * charge_busy ) {
59 0 : if( FD_UNLIKELY( fd_fseq_query( ctx->waker_fseq )==1UL ) ) {
60 0 : fd_fseq_update( ctx->waker_fseq, 0UL );
61 0 : *charge_busy = fd_http_server_epoll_poll( ctx->metrics_server, ULONG_MAX );
62 0 : fd_waker_client_rearm( ctx->waker_client_idx );
63 0 : } else if( FD_LIKELY( !stem->sleep ) ) {
64 0 : fd_log_sleep( (long)1e6 );
65 0 : }
66 0 : }
67 :
68 : static fd_http_server_response_t
69 0 : metrics_http_request( fd_http_server_request_t const * request ) {
70 0 : fd_metric_ctx_t * ctx = (fd_metric_ctx_t *)request->ctx;
71 :
72 0 : if( FD_UNLIKELY( request->method!=FD_HTTP_SERVER_METHOD_GET ) ) {
73 0 : return (fd_http_server_response_t){
74 0 : .status = 400,
75 0 : };
76 0 : }
77 :
78 0 : if( FD_LIKELY( !strcmp( request->path, "/metrics" ) ) ) {
79 0 : fd_prometheus_render_all( ctx->topo, ctx->metrics_server );
80 :
81 0 : fd_http_server_response_t response = {
82 0 : .status = 200,
83 0 : .content_type = "text/plain; version=0.0.4",
84 0 : };
85 0 : if( FD_UNLIKELY( fd_http_server_stage_body( ctx->metrics_server, &response ) ) ) {
86 0 : FD_LOG_WARNING(( "fd_http_server_stage_body failed, metrics response too long" ));
87 0 : return (fd_http_server_response_t){
88 0 : .status = 500,
89 0 : };
90 0 : }
91 0 : return response;
92 0 : } else {
93 0 : return (fd_http_server_response_t){
94 0 : .status = 404,
95 0 : };
96 0 : }
97 0 : }
98 :
99 : static void
100 0 : metrics_write( fd_metric_ctx_t * ctx ) {
101 0 : FD_MGAUGE_SET( METRIC, BOOT_TIME, (ulong)ctx->boot_ts );
102 :
103 0 : FD_MGAUGE_SET( METRIC, CONN_OPEN, ctx->metrics_server->metrics.connection_cnt );
104 :
105 0 : FD_MCNT_SET( METRIC, CONN_TX_BYTES, ctx->metrics_server->metrics.bytes_written );
106 0 : FD_MCNT_SET( METRIC, CONN_RX_BYTES, ctx->metrics_server->metrics.bytes_read );
107 0 : }
108 :
109 : static void
110 : privileged_init( fd_topo_t const * topo,
111 0 : fd_topo_tile_t const * tile ) {
112 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
113 :
114 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
115 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
116 :
117 0 : fd_http_server_t * _metrics = FD_SCRATCH_ALLOC_APPEND( l, fd_http_server_align(), fd_http_server_footprint( METRICS_PARAMS ) );
118 :
119 0 : fd_http_server_callbacks_t metrics_callbacks = {
120 0 : .request = metrics_http_request,
121 0 : };
122 0 : ctx->metrics_server = fd_http_server_join( fd_http_server_new( _metrics, METRICS_PARAMS, metrics_callbacks, ctx ) );
123 :
124 0 : ctx->waker_client_idx = tile->waker_client_idx;
125 0 : FD_TEST( ctx->waker_client_idx!=ULONG_MAX );
126 0 : fd_http_server_listen( ctx->metrics_server, FD_WAKER_INNER_FD( ctx->waker_client_idx ), tile->metric.prometheus_listen_addr, tile->metric.prometheus_listen_port );
127 0 : }
128 :
129 : static void
130 : unprivileged_init( fd_topo_t const * topo,
131 0 : fd_topo_tile_t const * tile ) {
132 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
133 :
134 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
135 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
136 :
137 0 : ctx->topo = topo;
138 0 : ctx->boot_ts = fd_log_wallclock();
139 :
140 0 : FD_TEST( ctx->waker_client_idx!=ULONG_MAX );
141 0 : ctx->waker_fseq = fd_fseq_join( fd_topo_obj_laddr( topo, tile->waker_fseq_obj_id ) );
142 0 : FD_TEST( ctx->waker_fseq );
143 :
144 0 : ulong scratch_top = FD_SCRATCH_ALLOC_FINI( l, scratch_align() );
145 0 : if( FD_UNLIKELY( scratch_top > (ulong)scratch + scratch_footprint( tile ) ) )
146 0 : FD_LOG_ERR(( "scratch overflow %lu %lu %lu", scratch_top - (ulong)scratch - scratch_footprint( tile ), scratch_top, (ulong)scratch + scratch_footprint( tile ) ));
147 :
148 0 : FD_LOG_NOTICE(( "prometheus server listening at %shttp://" FD_IP4_ADDR_FMT ":%u/metrics%s", fd_log_style_bold(), FD_IP4_ADDR_FMT_ARGS( tile->metric.prometheus_listen_addr ), tile->metric.prometheus_listen_port, fd_log_style_normal() ));
149 0 : }
150 :
151 : static ulong
152 : populate_allowed_seccomp( fd_topo_t const * topo,
153 : fd_topo_tile_t const * tile,
154 : ulong out_cnt,
155 0 : struct sock_filter * out ) {
156 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
157 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
158 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
159 :
160 0 : uint epoll_inner_fd = (uint)FD_WAKER_INNER_FD( tile->waker_client_idx );
161 0 : uint epoll_outer_fd = (uint)FD_WAKER_OUTER_FD;
162 :
163 0 : populate_sock_filter_policy_fd_metric_tile( out_cnt, out, (uint)fd_log_private_logfile_fd(), (uint)fd_http_server_fd( ctx->metrics_server ), epoll_inner_fd, epoll_outer_fd );
164 0 : return sock_filter_policy_fd_metric_tile_instr_cnt;
165 0 : }
166 :
167 : static ulong
168 : populate_allowed_fds( fd_topo_t const * topo,
169 : fd_topo_tile_t const * tile,
170 : ulong out_fds_cnt,
171 0 : int * out_fds ) {
172 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
173 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
174 0 : fd_metric_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_metric_ctx_t ), sizeof( fd_metric_ctx_t ) );
175 :
176 0 : if( FD_UNLIKELY( out_fds_cnt<5UL ) ) FD_LOG_ERR(( "out_fds_cnt %lu", out_fds_cnt ));
177 :
178 0 : ulong out_cnt = 0;
179 0 : out_fds[ out_cnt++ ] = 2; /* stderr */
180 0 : if( FD_LIKELY( -1!=fd_log_private_logfile_fd() ) )
181 0 : out_fds[ out_cnt++ ] = fd_log_private_logfile_fd(); /* logfile */
182 0 : out_fds[ out_cnt++ ] = fd_http_server_fd( ctx->metrics_server ); /* metrics listen socket */
183 0 : out_fds[ out_cnt++ ] = FD_WAKER_OUTER_FD; /* waker outer epoll fd (rearm) */
184 0 : out_fds[ out_cnt++ ] = FD_WAKER_INNER_FD( tile->waker_client_idx ); /* waker inner epoll fd */
185 0 : return out_cnt;
186 0 : }
187 :
188 0 : #define STEM_BURST (1UL)
189 0 : #define STEM_LAZY ((long)10e6) /* 10ms */
190 :
191 0 : #define STEM_CALLBACK_CONTEXT_TYPE fd_metric_ctx_t
192 0 : #define STEM_CALLBACK_CONTEXT_ALIGN alignof(fd_metric_ctx_t)
193 :
194 0 : #define STEM_CALLBACK_BEFORE_CREDIT before_credit
195 0 : #define STEM_CALLBACK_METRICS_WRITE metrics_write
196 :
197 : #include "../stem/fd_stem.c"
198 :
199 : fd_topo_run_tile_t fd_tile_metric = {
200 : .name = "metric",
201 : .rlimit_file_cnt = FD_HTTP_SERVER_METRICS_MAX_CONNS+5UL, /* pipefd, socket, stderr, logfile, and one spare for new accept() connections */
202 : .populate_allowed_seccomp = populate_allowed_seccomp,
203 : .populate_allowed_fds = populate_allowed_fds,
204 : .scratch_align = scratch_align,
205 : .scratch_footprint = scratch_footprint,
206 : .privileged_init = privileged_init,
207 : .unprivileged_init = unprivileged_init,
208 : .run = stem_run,
209 : };
|
