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Do not use directly. ### ### $Id$ ######################################################################## @if $m2c_mark_boundary == 1@ /** START code generated by $RCSfile$ $Revision$ */ @end@ ##//#################################################################### ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @if $m2c_processing_type eq 'h'@ @ if $m2c_data_cache != 1@ void ${context}_container_init(netsnmp_container **container_ptr_ptr); @ else@ /* * TODO:180:o: Review ${context} cache timeout. * The number of seconds before the cache times out */ #define $context.uc_CACHE_TIMEOUT 60 void ${context}_container_init(netsnmp_container **container_ptr_ptr, netsnmp_cache *cache); @ end@ # data cache void ${context}_container_shutdown(netsnmp_container *container_ptr); int ${context}_container_load(netsnmp_container *container); void ${context}_container_free(netsnmp_container *container); @ if $m2c_data_cache == 1@ int ${context}_cache_load(netsnmp_container *container); void ${context}_cache_free(netsnmp_container *container); @ end@ @ if $m2c_include_examples == 1@ $example_start /* ********************************************************************* * Since we have no idea how you really access your data, we'll go with * a worst case example: a flat text file. */ #define MAX_LINE_SIZE 256 $example_end @ end@ // example @end@ // m2c_processing_type eq 'h' ##//#################################################################### ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @if $m2c_processing_type eq 'c'@ /** * container overview * */ /** * container initialization * * @param container_ptr_ptr A pointer to a container pointer. If you * create a custom container, use this parameter to return it * to the MFD helper. If set to NULL, the MFD helper will * allocate a container for you. @ if $m2c_data_cache == 1@ * @param cache A pointer to a cache structure. You can set the timeout * and other cache flags using this pointer. @ end@ * * This function is called at startup to allow you to customize certain * aspects of the access method. For the most part, it is for advanced * users. The default code should suffice for most cases. If no custom * container is allocated, the MFD code will create one for your. * @ if $m2c_data_cache == 1@ * This is also the place to set up cache behavior. The default, to * simply set the cache timeout, will work well with the default * container. If you are using a custom container, you may want to * look at the cache helper documentation to see if there are any * flags you want to set. * @ end@ * @remark * This would also be a good place to do any initialization needed * for you data source. For example, opening a connection to another * process that will supply the data, opening a database, etc. */ void @ if $m2c_data_cache != 1@ ${context}_container_init(netsnmp_container **container_ptr_ptr) @ else@ ${context}_container_init(netsnmp_container **container_ptr_ptr, netsnmp_cache *cache) @ end@ { DEBUGMSGTL(("verbose:${context}:${context}_container_init","called\n")); if (NULL == container_ptr_ptr) { snmp_log(LOG_ERR,"bad container param to ${context}_container_init\n"); return; } /* * For advanced users, you can use a custom container. If you * do not create one, one will be created for you. */ *container_ptr_ptr = NULL; @if $m2c_data_cache == 1@ if (NULL == cache) { snmp_log(LOG_ERR,"bad cache param to ${context}_container_init\n"); return; } /* * TODO:345:A: Set up $context cache properties. * * Also for advanced users, you can set parameters for the * cache. Do not change the magic pointer, as it is used * by the MFD helper. To completely disable caching, set * cache->enabled to 0. */ cache->timeout = $context.uc_CACHE_TIMEOUT; /* seconds */ @end@ } /* ${context}_container_init */ /** * container shutdown * * @param container_ptr A pointer to the container. * * This function is called at shutdown to allow you to customize certain * aspects of the access method. For the most part, it is for advanced * users. The default code should suffice for most cases. * * This function is called before ${context}_container_free(). * * @remark * This would also be a good place to do any cleanup needed * for you data source. For example, closing a connection to another * process that supplied the data, closing a database, etc. */ void ${context}_container_shutdown(netsnmp_container *container_ptr) { DEBUGMSGTL(("verbose:${context}:${context}_container_shutdown","called\n")); if (NULL == container_ptr) { snmp_log(LOG_ERR,"bad params to ${context}_container_shutdown\n"); return; } } /* ${context}_container_shutdown */ /** * load initial data * * TODO:350:M: Implement $context data load @ if $m2c_data_cache == 1@ * This function will also be called by the cache helper to load * the container again (after the container free function has been * called to free the previous contents). @ end@ * * @param container container to which items should be inserted * * @retval MFD_SUCCESS : success. * @retval MFD_RESOURCE_UNAVAILABLE : Can't access data source * @retval MFD_ERROR : other error. * * This function is called to load the index(es) (and data, optionally) * for the every row in the data set. * * @remark * While loading the data, the only important thing is the indexes. * If access to your data is cheap/fast (e.g. you have a pointer to a * structure in memory), it would make sense to update the data here. * If, however, the accessing the data invovles more work (e.g. parsing * some other existing data, or peforming calculations to derive the data), * then you can limit yourself to setting the indexes and saving any * information you will need later. Then use the saved information in * ${context}_row_prep() for populating data. * * @note * If you need consistency between rows (like you want statistics * for each row to be from the same time frame), you should set all * data here. * */ int ${context}_container_load(netsnmp_container *container) { ${context}_rowreq_ctx *rowreq_ctx; size_t count = 0; /* * temporary storage for index values */ @ foreach $node index@ @ include m2c_setup_node.m2i@ /* * $m2c_node_summary */ @ if $m2c_node_needlength == 1@ @ eval $m2c_gi_maxlen = (126 - $node.oidlength - $m2c_gi_others)@ @ if $m2c_node_maxlen > $m2c_gi_maxlen@ @ eval $m2c_node_maxlen = $m2c_gi_maxlen@ /** 128 - 1(entry) - 1(col) - $m2c_gi_others(other indexes) = $m2c_node_maxlen */ @ end@ @ end@ # needlength @ include node-storage.m2i@ @ end@ // foreach @if $m2c_include_examples == 1@ /* * this example code is based on a data source that is a * text file to be read and parsed. */ FILE *filep; char line[MAX_LINE_SIZE]; @end@ // examples DEBUGMSGTL(("verbose:${context}:${context}_container_load","called\n")); @if $m2c_include_examples == 1@ $example_start /* * open our data file. */ filep = fopen("/etc/dummy.conf", "r"); if(NULL == filep) { return MFD_RESOURCE_UNAVAILABLE; } $example_end @end@ // example /* * TODO:351:M: |-> Load/update data in the $context container. * loop over your $context data, allocate a rowreq context, * set the index(es) [and data, optionally] and insert into * the container. */ while( 1 ) { @ if $m2c_include_examples == 0@ /* * check for end of data; bail out if there is no more data */ if( 1 ) break; @ else@ $example_start /* * get a line (skip blank lines) */ do { if (!fgets(line, sizeof(line), filep)) { /* we're done */ fclose(filep); filep = NULL; } } while (filep && (line[0] == '\n')); /* * check for end of data */ if(NULL == filep) break; /* * parse line into variables */ $example_end @ end@ # example /* * TODO:352:M: | |-> set indexes in new $context rowreq context. @ eval $m2c_tmp = ""@ @ if ($m2c_data_allocate == 1) || ($m2c_data_init == 1)@ @ eval $m2c_tmp = "NULL"@ @ if ($m2c_data_allocate == 1) && ($m2c_data_init == 1)@ @ eval $m2c_tmp = "$m2c_tmp, NULL"@ * data context will be set from the first param (unless NULL, * in which case a new data context will be allocated) * the second param will be passed, with the row context, to * ${context}rowreq_ctx_init. @ else@ * data context will be set from the param (unless NULL, * in which case a new data context will be allocated) @ @end@ @ end@ */ rowreq_ctx = ${context}_allocate_rowreq_ctx($m2c_tmp); if (NULL == rowreq_ctx) { snmp_log(LOG_ERR, "memory allocation failed\n"); return MFD_RESOURCE_UNAVAILABLE; } if(MFD_SUCCESS != ${context}_indexes_set(rowreq_ctx @ foreach $node index@ @ include m2c_setup_node.m2i@ @ if $m2c_node_needlength == 1@ , $node, ${node}_len @ else@ , $node @ end@ @ end@ # foreach index )) { snmp_log(LOG_ERR,"error setting index while loading " "${context} data.\n"); ${context}_release_rowreq_ctx(rowreq_ctx); continue; } /* * TODO:352:r: | |-> populate $context data context. * Populate data context here. (optionally, delay until row prep) */ @if $m2c_data_transient == 0@ # persistent /* non-TRANSIENT data: no need to copy. set pointer to data */ @else@ /* * TRANSIENT or semi-TRANSIENT data: * copy data or save any info needed to do it in row_prep. */ @ foreach $node nonindex@ @ include m2c_setup_node.m2i@ /* * setup/save data for $node * $m2c_node_summary */ @ if "$m2c_data_context" eq "generated"@ @ eval $m2c_ctx_lh = "$m2c_ctx_rh"@ @ eval $m2c_ctx_lhs = "$m2c_ctx_rhs"@ @ eval $m2c_ctx_rh = "$node"@ @ eval $m2c_ctx_rhs = "${node}_len"@ @ include generic-value-map.m2i@ @ end@ # data_context ! generated @ end@ // for each @end@ # transient /* * insert into table container */ CONTAINER_INSERT(container, rowreq_ctx); ++count; } @if $m2c_include_examples == 1@ $example_start if(NULL != filep) fclose(filep); $example_end @end@ # example DEBUGMSGT(("verbose:${context}:${context}_container_load", "inserted %d records\n", count)); return MFD_SUCCESS; } /* ${context}_container_load */ /** * container clean up * * @param container container with all current items * * This optional callback is called prior to all * item's being removed from the container. If you * need to do any processing before that, do it here. * * @note * The MFD helper will take care of releasing all the row contexts. @ if ($m2c_data_allocate == 1) && ($m2c_data_transient == 0)@ * If you did not pass a data context pointer when allocating * the rowreq context, the one that was allocated will be deleted. * If you did pass one in, it will not be deleted and that memory * is your responsibility. @ end@ * */ void ${context}_container_free(netsnmp_container *container) { DEBUGMSGTL(("verbose:${context}:${context}_container_free","called\n")); /* * TODO:380:M: Free $context container data. */ } /* ${context}_container_free */ @end@ // m2c_processing_type eq 'c' ######################################################################## ##//#################################################################### ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @if $m2c_processing_type eq 'i'@ @ if $m2c_data_cache == 1@ static void _container_free(netsnmp_container *container); /** * @internal */ static int _cache_load(netsnmp_cache *cache, void *vmagic) { DEBUGMSGTL(("internal:${context}:_cache_load","called\n")); if((NULL == cache) || (NULL == cache->magic)) { snmp_log(LOG_ERR, "invalid cache for ${context}_cache_load\n"); return -1; } /** should only be called for an invalid or expired cache */ netsnmp_assert((0 == cache->valid) || (1 == cache->expired)); /* * call user code */ return ${context}_container_load((netsnmp_container*)cache->magic); } /* _cache_load */ /** * @internal */ static void _cache_free(netsnmp_cache *cache, void *magic) { netsnmp_container *container; DEBUGMSGTL(("internal:${context}:_cache_free","called\n")); if((NULL == cache) || (NULL == cache->magic)) { snmp_log(LOG_ERR, "invalid cache in ${context}_cache_free\n"); return; } container = (netsnmp_container*)cache->magic; _container_free(container); } /* _cache_free */ @ end@ # cache /** * @internal */ static void _container_item_free(${context}_rowreq_ctx *rowreq_ctx, void *context) { DEBUGMSGTL(("internal:${context}:_container_item_free","called\n")); if(NULL == rowreq_ctx) return; ${context}_release_rowreq_ctx(rowreq_ctx); } /* _container_item_free */ /** * @internal */ static void _container_free(netsnmp_container *container) { DEBUGMSGTL(("internal:${context}:_container_free","called\n")); if (NULL == container) { snmp_log(LOG_ERR, "invalid container in ${context}_container_free\n"); return; } /* * call user code */ ${context}_container_free(container); /* * free all items. inefficient, but easy. */ CONTAINER_CLEAR(container, (netsnmp_container_obj_func *)_container_item_free, NULL); } /* _container_free */ /** * @internal * initialize the container with functions or wrappers */ void _${context}_container_init(${context}_interface_ctx *if_ctx) { DEBUGMSGTL(("internal:${context}:_${context}_container_init","called\n")); @ if $m2c_data_cache == 1@ /* * cache init */ @ if 0@ if_ctx->cache = netsnmp_cache_find_by_oid(PARTNER_oid, OID_LENGTH(PARTNER_oid)); @ else@ if_ctx->cache = netsnmp_cache_create(30, /* timeout in seconds */ _cache_load, _cache_free, ${context}_oid, ${context}_oid_size); @ end@ // shared cache if(NULL == if_ctx->cache) { snmp_log(LOG_ERR, "error creating cache for ${context}\n"); return; } if_ctx->cache->flags = NETSNMP_CACHE_DONT_INVALIDATE_ON_SET; ${context}_container_init(&if_ctx->container, if_ctx->cache); @ else@ /* * container init */ ${context}_container_init(&if_ctx->container); @ end@ data cache if(NULL == if_ctx->container) if_ctx->container = netsnmp_container_find("${context}:table_container"); if(NULL == if_ctx->container) { snmp_log(LOG_ERR,"error creating container in " "${context}_container_init\n"); return; } @ if $m2c_data_cache == 1@ if (NULL != if_ctx->cache) if_ctx->cache->magic = (void*)if_ctx->container; @ end@ } /* _${context}_container_init */ /** * @internal * shutdown the container with functions or wrappers */ void _${context}_container_shutdown(${context}_interface_ctx *if_ctx) { DEBUGMSGTL(("internal:${context}:_${context}_container_shutdown","called\n")); ${context}_container_shutdown(if_ctx->container); _container_free(if_ctx->container); } /* _${context}_container_shutdown */ @end@ // m2c_processing_type eq 'i' ######################################################################## ##//#################################################################### ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ ##//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @if $m2c_processing_type eq 'r'@ ## container summary ------------------------ The container data access code is for cases when you want to store your data in the agent/sub-agent. ... to be continued... @ if $m2c_data_cache == 1@ cache summary ------------------------ The container-cached data access code is for cases when you want to cache your data in the agent/sub-agent. ... to be continued... @ end@ @end@ // m2c_processing_type eq 'r' ######################################################################## ##//#################################################################### @if $m2c_mark_boundary == 1@ /** END code generated by $RCSfile$ $Revision$ */ @end@