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Overview
Comment: | Add too/tserver.c - the implementation of a simple multi-threaded server designed for interactive testing of concurrency between connections used by different threads of the same process. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | server-edition |
Files: | files | file ages | folders |
SHA3-256: |
05b4fc4340011847c8585bb822d339dd |
User & Date: | dan 2017-06-07 15:55:59.971 |
Context
2017-06-20
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19:20 | Ensure that test tool "tserver" finalizes all statements before attempting to close a database handle. (check-in: d8568aacf0 user: dan tags: server-edition) | |
2017-06-07
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15:55 | Add too/tserver.c - the implementation of a simple multi-threaded server designed for interactive testing of concurrency between connections used by different threads of the same process. (check-in: 05b4fc4340 user: dan tags: server-edition) | |
2017-05-22
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08:01 | Add code to this branch to emit a log message after each cumulative second that the WRITER lock has been held. (check-in: a726d98122 user: dan tags: server-edition) | |
Changes
Added tool/tserver.c.
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In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** Simple multi-threaded server used for informal testing of concurrency ** between connections in different threads. Listens for tcp/ip connections ** on port 9999 of the 127.0.0.1 interface only. To build: ** ** gcc -g $(TOP)/tool/tserver.c sqlite3.o -lpthread -o tserver ** ** To run using "x.db" as the db file: ** ** ./tserver x.db ** ** To connect, open a client socket on port 9999 and start sending commands. ** Commands are either SQL - which must be terminated by a semi-colon, or ** dot-commands, which must be terminated by a newline. If an SQL statement ** is seen, it is prepared and added to an internal list. ** ** Dot-commands are: ** ** .list Display all SQL statements in the list. ** .quit Disconnect. ** .run Run all SQL statements in the list. ** .repeats N Configure the number of repeats per ".run". ** .seconds N Configure the number of seconds to ".run" for. ** ** Example input: ** ** BEGIN; ** INSERT INTO t1 VALUES(randomblob(10), randomblob(100)); ** INSERT INTO t1 VALUES(randomblob(10), randomblob(100)); ** INSERT INTO t1 VALUES(randomblob(10), randomblob(100)); ** COMMIT; ** .repeats 100000 ** .run ** */ #define TSERVER_PORTNUMBER 9999 #include <arpa/inet.h> #include <assert.h> #include <pthread.h> #include <signal.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <sys/time.h> #include <unistd.h> #include "sqlite3.h" /* Database used by this server */ static char *zDatabaseName = 0; typedef struct ClientCtx ClientCtx; struct ClientCtx { sqlite3 *db; /* Database handle for this client */ int fd; /* Client fd */ int nRepeat; /* Number of times to repeat SQL */ int nSecond; /* Number of seconds to run for */ sqlite3_stmt **apPrepare; /* Array of prepared statements */ int nPrepare; /* Valid size of apPrepare[] */ int nAlloc; /* Allocated size of apPrepare[] */ }; static int is_eol(int i){ return (i=='\n' || i=='\r'); } static int is_whitespace(int i){ return (i==' ' || i=='\t' || is_eol(i)); } static void trim_string(const char **pzStr, int *pnStr){ const char *zStr = *pzStr; int nStr = *pnStr; while( nStr>0 && is_whitespace(zStr[0]) ){ zStr++; nStr--; } while( nStr>0 && is_whitespace(zStr[nStr-1]) ){ nStr--; } *pzStr = zStr; *pnStr = nStr; } static int send_message(ClientCtx *p, const char *zFmt, ...){ char *zMsg; va_list ap; /* Vararg list */ va_start(ap, zFmt); int res = -1; zMsg = sqlite3_vmprintf(zFmt, ap); if( zMsg ){ res = write(p->fd, zMsg, strlen(zMsg)); } sqlite3_free(zMsg); va_end(ap); return (res<0); } static int handle_some_sql(ClientCtx *p, const char *zSql, int nSql){ const char *zTail = zSql; int nTail = nSql; int rc = SQLITE_OK; while( rc==SQLITE_OK ){ if( p->nPrepare>=p->nAlloc ){ int nByte = (p->nPrepare+32) * sizeof(sqlite3_stmt*); sqlite3_stmt **apNew = sqlite3_realloc(p->apPrepare, nByte); if( apNew ){ p->apPrepare = apNew; p->nAlloc = p->nPrepare+32; }else{ rc = SQLITE_NOMEM; break; } } rc = sqlite3_prepare_v2( p->db, zTail, nTail, &p->apPrepare[p->nPrepare], &zTail ); if( rc!=SQLITE_OK ){ send_message(p, "error - %s\n", sqlite3_errmsg(p->db)); rc = 1; break; } if( p->apPrepare[p->nPrepare]==0 ){ break; } p->nPrepare++; nTail = nSql - (zTail-zSql); rc = send_message(p, "ok (%d SQL statements)\n", p->nPrepare); } return rc; } static sqlite3_int64 get_timer(void){ struct timeval t; gettimeofday(&t, 0); return ((sqlite3_int64)t.tv_usec / 1000) + ((sqlite3_int64)t.tv_sec * 1000); } static int handle_dot_command(ClientCtx *p, const char *zCmd, int nCmd){ assert( zCmd[0]=='.' ); int n; int rc = 0; const char *z = &zCmd[1]; const char *zArg; int nArg; for(n=0; n<(nCmd-1); n++){ if( is_whitespace(z[n]) ) break; } zArg = &z[n]; nArg = nCmd-n; trim_string(&zArg, &nArg); if( n>=1 && n<=4 && 0==strncmp(z, "list", n) ){ int i; for(i=0; rc==0 && i<p->nPrepare; i++){ const char *zSql = sqlite3_sql(p->apPrepare[i]); int nSql = strlen(zSql); trim_string(&zSql, &nSql); rc = send_message(p, "%d: %.*s\n", i, nSql, zSql); } } else if( n>=1 && n<=4 && 0==strncmp(z, "quit", n) ){ rc = 1; } else if( n>=2 && n<=7 && 0==strncmp(z, "repeats", n) ){ if( nArg ){ p->nRepeat = strtol(zArg, 0, 0); } rc = send_message(p, "ok (repeat=%d)\n", p->nRepeat); } else if( n>=2 && n<=3 && 0==strncmp(z, "run", n) ){ int i, j; int nBusy = 0; sqlite3_int64 t0 = get_timer(); sqlite3_int64 t1 = t0; int nT1 = 0; int nTBusy1 = 0; for(j=0; (p->nRepeat<=0 || j<p->nRepeat) && rc==SQLITE_OK; j++){ sqlite3_int64 t2; for(i=0; i<p->nPrepare && rc==SQLITE_OK; i++){ sqlite3_stmt *pStmt = p->apPrepare[i]; /* Execute the statement */ while( sqlite3_step(pStmt)==SQLITE_ROW ); rc = sqlite3_reset(pStmt); if( (rc & 0xFF)==SQLITE_BUSY ){ if( sqlite3_get_autocommit(p->db)==0 ){ sqlite3_exec(p->db, "ROLLBACK", 0, 0, 0); } nBusy++; rc = SQLITE_OK; break; } else if( rc!=SQLITE_OK ){ send_message(p, "error - %s\n", sqlite3_errmsg(p->db)); } } t2 = get_timer(); if( t2>=(t1+1000) ){ int nMs = (t2 - t1); int nDone = (j+1 - nBusy - nT1); rc = send_message( p, "(%d done @ %d per second, %d busy)\n", nDone, (1000*nDone + nMs/2) / nMs, nBusy - nTBusy1 ); t1 = t2; nT1 = j+1 - nBusy; nTBusy1 = nBusy; if( p->nSecond>=0 && (p->nSecond*1000)<=t1-t0 ) break; } } if( rc==SQLITE_OK ){ send_message(p, "ok (%d/%d SQLITE_BUSY)\n", nBusy, j); } } else if( n>=1 && n<=7 && 0==strncmp(z, "seconds", n) ){ if( nArg ){ p->nSecond = strtol(zArg, 0, 0); if( p->nSecond>0 ) p->nRepeat = 0; } rc = send_message(p, "ok (repeat=%d)\n", p->nRepeat); } else{ send_message(p, "unrecognized dot command: %.*s\n" "should be \"list\", \"run\", \"repeats\", or \"seconds\"\n", n, z ); rc = 1; } return rc; } static void *handle_client(void *pArg){ char zCmd[32*1024]; /* Read buffer */ int nCmd = 0; /* Valid bytes in zCmd[] */ int res; /* Result of read() call */ int rc = SQLITE_OK; ClientCtx ctx; memset(&ctx, 0, sizeof(ClientCtx)); ctx.fd = (int)(intptr_t)pArg; ctx.nRepeat = 1; rc = sqlite3_open(zDatabaseName, &ctx.db); if( rc!=SQLITE_OK ){ fprintf(stderr, "sqlite3_open(): %s\n", sqlite3_errmsg(ctx.db)); return 0; } while( rc==SQLITE_OK ){ int i; int iStart; int nConsume; int bQuote = 0; res = read(ctx.fd, &zCmd[nCmd], sizeof(zCmd)-nCmd-1); if( res<=0 ) break; nCmd += res; if( nCmd>=sizeof(zCmd)-1 ){ fprintf(stderr, "oversized (>32KiB) message\n"); res = 0; break; } zCmd[nCmd] = '\0'; do { nConsume = 0; /* Gobble up any whitespace */ iStart = 0; while( is_whitespace(zCmd[iStart]) ) iStart++; if( zCmd[iStart]=='.' ){ /* This is a dot-command. Search for end-of-line. */ for(i=iStart; i<nCmd; i++){ if( is_eol(zCmd[i]) ){ rc = handle_dot_command(&ctx, &zCmd[iStart], i-iStart); nConsume = i+1; break; } } }else{ int iSemi; char c = 0; for(iSemi=iStart; iSemi<nCmd; iSemi++){ if( zCmd[iSemi]==';' ){ c = zCmd[iSemi+1]; zCmd[iSemi+1] = '\0'; break; } } if( iSemi<nCmd ){ if( sqlite3_complete(zCmd) ){ rc = handle_some_sql(&ctx, zCmd, iSemi+1); nConsume = iSemi+1; } if( c ){ zCmd[iSemi+1] = c; } } } if( nConsume>0 ){ nCmd = nCmd-nConsume; if( nCmd>0 ){ memmove(zCmd, &zCmd[nConsume], nCmd); } } }while( rc==SQLITE_OK && nConsume>0 ); } fprintf(stdout, "Client %d disconnects\n", ctx.fd); close(ctx.fd); sqlite3_close(ctx.db); return 0; } int main(int argc, char *argv[]) { sqlite3 *db; int sfd; int rc; int yes = 1; struct sockaddr_in server; struct sockaddr_in client; /* Ignore SIGPIPE. Otherwise the server exits if a client disconnects ** abruptly. */ signal(SIGPIPE, SIG_IGN); if( argc!=2 ){ fprintf(stderr, "Usage: %s DATABASE\n", argv[0]); return 1; } zDatabaseName = argv[1]; rc = sqlite3_open(zDatabaseName, &db); if( rc!=SQLITE_OK ){ fprintf(stderr, "sqlite3_open(): %s\n", sqlite3_errmsg(db)); return 1; } rc = sqlite3_exec(db, "SELECT * FROM sqlite_master", 0, 0, 0); if( rc!=SQLITE_OK ){ fprintf(stderr, "sqlite3_exec(): %s\n", sqlite3_errmsg(db)); return 1; } sfd = socket(AF_INET, SOCK_STREAM, 0); if( sfd<0 ){ fprintf(stderr, "socket() failed\n"); return 1; } rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)); if( rc<0 ){ perror("setsockopt"); return 1; } memset(&server, 0, sizeof(server)); server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr("127.0.0.1"); server.sin_port = htons(TSERVER_PORTNUMBER); rc = bind(sfd, (struct sockaddr *)&server, sizeof(struct sockaddr)); if( rc<0 ){ fprintf(stderr, "bind() failed\n"); return 1; } rc = listen(sfd, 8); if( rc<0 ){ fprintf(stderr, "listen() failed\n"); return 1; } while( 1 ){ pthread_t tid; int cfd = accept(sfd, NULL, NULL); if( cfd<0 ){ perror("accept()"); return 1; } fprintf(stdout, "Client %d connects\n", cfd); rc = pthread_create(&tid, NULL, handle_client, (void*)(intptr_t)cfd); if( rc!=0 ){ perror("pthread_create()"); return 1; } pthread_detach(tid); } return 0; } |