Add support for filesystems (free space, inodes, etc)

Makefile

@@ -2,16 +2,19 @@ GIT_VERSION := $(shell git --no-pager describe --tags --always --long | sed "s/v
 
 all: build/node_exporter_aix
 
-build/node_exporter_aix: build/server.o build/collectors.o build/main.o
-	g++ -Wall -Werror -fmax-errors=5 -fconcepts -std=c++17 -pthread -lperfstat -DUSE_STANDALONE_ASIO -DASIO_STANDALONE -DASIO_HAS_PTHREADS -static-libgcc -Wl,-bstatic -lstdc++ -lgcc -Wl,-bdynamic -o build/node_exporter_aix build/server.o build/collectors.o build/main.o
+build/node_exporter_aix: build/server.o build/collectors.o build/main.o build/mounts.o
+	g++ -Wall -Werror -fmax-errors=5 -fconcepts -std=c++17 -pthread -lperfstat -DUSE_STANDALONE_ASIO -DASIO_STANDALONE -DASIO_HAS_PTHREADS -static-libgcc -Wl,-bstatic -lstdc++ -lgcc -Wl,-bdynamic -o build/node_exporter_aix build/server.o build/collectors.o build/main.o build/mounts.o
 
-build/server.o: server.cpp
+build/server.o: server.cpp node_exporter_aix.hpp
 	g++ -Wall -Werror -fmax-errors=5 -fconcepts -std=c++17 -pthread -lperfstat -I Simple-Web-Server -I asio/asio/include -DUSE_STANDALONE_ASIO -DASIO_STANDALONE -DASIO_HAS_PTHREADS -c -o build/server.o server.cpp
 
-build/main.o: main.cpp
+build/main.o: main.cpp node_exporter_aix.hpp
 	g++ -Wall -Werror -fmax-errors=5 -fconcepts -std=c++17 -pthread -lperfstat -DUSE_STANDALONE_ASIO -DASIO_STANDALONE -DASIO_HAS_PTHREADS -D PROG_VERSION="\"$(GIT_VERSION)\"" -c -o build/main.o main.cpp
 
-build/collectors.o: collectors.cpp generated/diskpaths.cpp generated/diskadapters.cpp generated/memory_pages.cpp generated/memory.cpp generated/cpus.cpp generated/disks.cpp generated/netinterfaces.cpp generated/netadapters.cpp generated/netbuffers.cpp generated/partition.cpp
+build/mounts.o: mounts.cpp node_exporter_aix.hpp
+	g++ -Wall -Werror -fmax-errors=5 -fconcepts -std=c++17 -pthread -lperfstat -DUSE_STANDALONE_ASIO -DASIO_STANDALONE -DASIO_HAS_PTHREADS -D PROG_VERSION="\"$(GIT_VERSION)\"" -c -o build/mounts.o mounts.cpp
+
+build/collectors.o: collectors.cpp generated/diskpaths.cpp generated/diskadapters.cpp generated/memory_pages.cpp generated/memory.cpp generated/cpus.cpp generated/disks.cpp generated/netinterfaces.cpp generated/netadapters.cpp generated/netbuffers.cpp generated/partition.cpp node_exporter_aix.hpp
 	g++ -Wall -Werror -fmax-errors=5 -fconcepts -std=c++17 -pthread -lperfstat -DUSE_STANDALONE_ASIO -DASIO_STANDALONE -DASIO_HAS_PTHREADS  -c -o build/collectors.o collectors.cpp
 
 generated/%s.cpp: data_sources/%.multiple scripts/generate_multiple.ksh templates/generate_multiple.template

collectors.cpp

@@ -6,6 +6,8 @@
 #include <stdio.h>
 #include <strings.h>
 
+#include "node_exporter_aix.hpp"
+
 std::string generate_static_labels() {
 	std::ostringstream labels;
 	static std::string output_str;
@@ -96,6 +98,46 @@ void gather_cpu_compat(std::ostringstream& response, const std::string& static_l
 	output_cpu_stat(response, static_labels, "node_intr",             "counter", "Total number of interrupts serviced.", cpu, [](perfstat_cpu_total_t& cpu) { return (double)cpu.decrintrs + (double)cpu.mpcrintrs + (double)cpu.mpcsintrs + (double)cpu.devintrs + (double)cpu.softintrs; });
 }
 
+void gather_filesystems(std::ostringstream& response, const std::string& static_labels) {
+	std::vector<filesystem> filesystems = stat_filesystems(list_mounts());
+
+	response << "# HELP node_filesystem_size_bytes Filesystem size in bytes." << std::endl;
+	response << "# TYPE node_filesystem_size_bytes gauge" << std::endl;
+	for(auto it = filesystems.begin(); it < filesystems.end(); it++) {
+		response << "node_filesystem_size_bytes{device=\"" << (*it).device << "\",fstype=\"jfs2\",mountpoint=\"" << (*it).mountpoint << "\"," << static_labels << "} " << (*it).size_bytes << std::endl;
+	}
+
+	response << "# HELP node_filesystem_free_bytes Filesystem free space in bytes." << std::endl;
+	response << "# TYPE node_filesystem_free_bytes gauge" << std::endl;
+	for(auto it = filesystems.begin(); it < filesystems.end(); it++) {
+		response << "node_filesystem_free_bytes{device=\"" << (*it).device << "\",fstype=\"jfs2\",mountpoint=\"" << (*it).mountpoint << "\"," << static_labels << "} " << (*it).free_bytes << std::endl;
+	}
+
+	response << "# HELP node_filesystem_avail_bytes Filesystem space available to non-root users in bytes." << std::endl;
+	response << "# TYPE node_filesystem_avail_bytes gauge" << std::endl;
+	for(auto it = filesystems.begin(); it < filesystems.end(); it++) {
+		response << "node_filesystem_avail_bytes{device=\"" << (*it).device << "\",fstype=\"jfs2\",mountpoint=\"" << (*it).mountpoint << "\"," << static_labels << "} " << (*it).avail_bytes << std::endl;
+	}
+
+	response << "# HELP node_filesystem_files Filesystem total file nodes." << std::endl;
+	response << "# TYPE node_filesystem_files gauge" << std::endl;
+	for(auto it = filesystems.begin(); it < filesystems.end(); it++) {
+		response << "node_filesystem_files{device=\"" << (*it).device << "\",fstype=\"jfs2\",mountpoint=\"" << (*it).mountpoint << "\"," << static_labels << "} " << (*it).files << std::endl;
+	}
+
+	response << "# HELP node_filesystem_files_free Filesystem total free file nodes." << std::endl;
+	response << "# TYPE node_filesystem_files_free gauge" << std::endl;
+	for(auto it = filesystems.begin(); it < filesystems.end(); it++) {
+		response << "node_filesystem_files_free{device=\"" << (*it).device << "\",fstype=\"jfs2\",mountpoint=\"" << (*it).mountpoint << "\"," << static_labels << "} " << (*it).files_free << std::endl;
+	}
+
+	response << "# HELP node_filesystem_files_avail Filesystem available file nodes to non-root users." << std::endl;
+	response << "# TYPE node_filesystem_files_avail gauge" << std::endl;
+	for(auto it = filesystems.begin(); it < filesystems.end(); it++) {
+		response << "node_filesystem_files_avail{device=\"" << (*it).device << "\",fstype=\"jfs2\",mountpoint=\"" << (*it).mountpoint << "\"," << static_labels << "} " << (*it).files_avail << std::endl;
+	}
+}
+
 #include "generated/diskadapters.cpp"
 #include "generated/diskpaths.cpp"
 #include "generated/memory_pages.cpp"

main.cpp

@@ -28,6 +28,7 @@ int usage(int c) {
 	std::cout << "  -a net adapter statistics" << std::endl;
 	std::cout << "  -b net buffer statistics" << std::endl;
 	std::cout << "  -P partition statistics" << std::endl;
+	std::cout << "  -f filesystem statistics" << std::endl;
 
 	return 1;
 }
@@ -39,7 +40,7 @@ int main(int argc, char **argv) {
 
 	int flags = 0, port = 9100;
 
-	while((c = getopt(argc, argv, "p:CcAPMmdiabph?")) != EOF) {
+	while((c = getopt(argc, argv, "p:CcAPMmdiabpfh?")) != EOF) {
 		switch(c) {
 			case 'p': port = std::stoi(optarg); break;
 			case 'C': flags |= PART_COMPAT; break;
@@ -53,6 +54,7 @@ int main(int argc, char **argv) {
 			case 'a': flags |= PART_NETADAPTER; break;
 			case 'b': flags |= PART_NETBUFFER; break;
 			case 'P': flags |= PART_PARTITION; break;
+			case 'f': flags |= PART_FILESYSTEMS; break;
 			case 'h': usage(c); return 0; break;
 			case '?': usage(c); return 0; break;
 			default:

node_exporter_aix.hpp

@@ -1,3 +1,6 @@
+#include <vector>
+#include <string>
+
 #define PART_COMPAT       (1<<0)
 #define PART_CPU          (1<<1)
 #define PART_DISKADAPTER  (1<<2)
@@ -8,7 +11,8 @@
 #define PART_NETINTERFACE (1<<7)
 #define PART_NETADAPTER   (1<<8)
 #define PART_NETBUFFER    (1<<9)
-#define PART_PARTITION    (1<<20)
+#define PART_PARTITION    (1<<10)
+#define PART_FILESYSTEMS  (1<<11)
 
 
 extern int start_server(int port, int flags);
@@ -27,3 +31,23 @@ extern void gather_netinterfaces(std::ostringstream& response, const std::string
 extern void gather_netadapters(std::ostringstream& response, const std::string& static_labels);
 extern void gather_netbuffers(std::ostringstream& response, const std::string& static_labels);
 extern void gather_partition(std::ostringstream& response, const std::string& static_labels);
+extern void gather_filesystems(std::ostringstream& response, const std::string& static_labels);
+
+struct mountpoint {
+	std::string mountpoint;
+	std::string device;
+};
+
+struct filesystem {
+	std::string mountpoint;
+	std::string device;
+	u_int64 avail_bytes; // f_bavail
+	u_int64 size_bytes; // f_bfrsize
+	u_int64 free_bytes; // f_bfree
+	u_int64 files; // f_files
+	u_int64 files_free; // f_ffree
+	u_int64 files_avail; // f_favail
+};
+
+extern std::vector<mountpoint> list_mounts();
+extern std::vector<filesystem> stat_filesystems(std::vector<mountpoint> mounts);

server.cpp

@@ -37,6 +37,7 @@ int start_server(int port, int flags) {
 		if(flags & PART_NETADAPTER)   gather_netadapters(output, static_labels);
 		if(flags & PART_NETBUFFER)    gather_netbuffers(output, static_labels);
 		if(flags & PART_PARTITION)    gather_partition(output, static_labels);
+		if(flags & PART_FILESYSTEMS)  gather_filesystems(output, static_labels);
 
 		auto outstr = output.str();
 		*response << "HTTP/1.1 200 OK\r\nContent-Length: " << outstr.length() << "\r\n\r\n"